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Journal articles on the topic 'Adsorption of methylene blue'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Haas, Aline, and Eliane Pereira dos Santos. "Characterization and application of orange peel as an adsorbent for cationic dye removal from aqueous solution." Revista Eletrônica em Gestão, Educação e Tecnologia Ambiental 25 (May 6, 2021): e16. http://dx.doi.org/10.5902/2236117065271.

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With the great generation of colored effluents, several methods for the removal of the color are used, being one of them the method of adsorption in solid medium. In this paper, the in natura orange peel was used as the alternative biomass for the adsorption process of methylene blue, which was characterized by moisture content, pH, apparent density, iodine number, and methylene blue index. To determine the adsorptive capacity of the methylene blue dye, pH 7 was obtained as favorable, the adsorption process showed an adsorption of 82% of the methylene blue dye and a 10 min equilibrium time, where the Freundlich isotherm presented a better adaptation to the adsorption process in orange peel, with its maximum adsorption capacity of 3.9630 mg g-1, for the methylene blue dye.
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2

Savcı, Serpil, and Fatma Karadağ. "FAST ADSORPTION OF METHYLENE BLUE BY FILTER COFFEE WASTE." e-Journal of New World Sciences Academy 15, no. 4 (October 31, 2020): 111–20. http://dx.doi.org/10.12739/nwsa.2020.15.4.5a0138.

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In this study, removal of a cationic dye methylene blue by filter coffee grounds as a potential waste was investigated. Systematically, the effect of initial dye concentration, pH and contact time on the adsorption efficiency were determined. Isotherm and kinetic models were studied. Langmuir and Freundlich model were calculated for adsorption of methylene blue. Langmuir model is better fit than Freundlich model (R2=0.9892). The maximum adsorption capacity of filter coffee waste were 312.515 mg/g. Scanning electron microscope (SEM) images were used to record the surface characteristics and morphological features of filter coffee waste. This study emphases that filter coffee waste can effectively remove methylene blue from aqueous solution.
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3

Labiebah, Ghina, Gunawan Gunawan, Muhammad Cholid Djunaidi, Abdul Haris, and Didik Setiyo Widodo. "Removal of Methylene Blue Using Used Paper Powder." Jurnal Kimia Sains dan Aplikasi 22, no. 1 (January 30, 2019): 23–28. http://dx.doi.org/10.14710/jksa.22.1.23-28.

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Methylene blue removal by adsorption method had been done in batch method using adsorbent of used paper powder. Adsorption parameters covering adsorbent doses, contact times, pH, adsorbate concentrations and adsorption isotherm as well as desorption study of the absorbed methylene blue were evaluated. The results showed the highest adsorption of methylene blue was obtained at an optimum adsorbent dose, for 30 min at pH > 9. The maximum adsorption capacity of 30.77 mg/g was obtained with Langmuir isotherm model. While the effective methylene blue desorption on the used paper powder adsorbent was obtained c.a. 0.27 mg/g at pH 1.
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4

Liu, Wen Lei, Shan Lin Zhao, Shuang Cui, Shuang Chun Yang, and Li Yan Shang. "The Research on the Adsorptive Capability and Adsorption Isotherm of Modified Talcum Powder to Methylene Blue." Advanced Materials Research 610-613 (December 2012): 1443–48. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.1443.

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The preparation conditions of modified talcum powder were investigated by discuss the effects of nitric acid mass concentration, nitric acid soak temperature, roasting temperature and roasting time on adsorption properties of methylene blue by talcum powder. Methylene blue dye, as target pollutant, exhibits difficult biochemical degradable characters. The adsorption isotherm of adsorption process was discussed by using the Langmuir isotherm model and Freundlich isotherms model. The results show that the rate of adsorption of methylene blue decreased with the increasing of roasting temperatures and nitric acid soak temperature of modificated talcum powder. The adsorption value of methylene blue of the modified talcum powder increased gradually，then decreased with the increase of roasting time. Compare with the unmodified talcum powder，the adsorption value of methylene blue of the modified talcum powder decreased when roasting temperature and roasting time is too high. With the nitric acid mass concentration increasing, the adsorption of methylene blue on the modified talcum powder increased. It is found that the adsorptive ability of modified talcum powder by HNO3 is higher than original talcum powder. The best talcum powder modified preparation condition is that nitric acid mass concentration 50%, the nitric acid soaks temperature 40°C, calcined temperature 200°C for 120 mins. The removal rate of methylene blue is 84.6% under these preparation conditions. The experimental date fitted very well with the Langmuir isotherms model.
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5

Zhang, Cai Ning, and Xu Man Wang. "Study on Adsorption of Methylene Blue by the Montmorillonite/poly(γ-Glutamic Acid) Composite." Advanced Materials Research 554-556 (July 2012): 333–38. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.333.

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The composite was prepared with montmorillonite (MMT) and poly(γ-glutamic acid) (γ-PGA). Applied the composite as the sorbent, methylene blue as the adsorbate, the influences of the initial concentrations of methylene blue, adsorption time and pH values of the solution on the adsorption capacity of methylene blue by the composite were studied. The experimental results showed that the adsorption capacity of methylene blue by MMT/γ-PGA composite both increased with the increasing of initial concentration of methylene blue and the prolonging of adsorption time, and then approached saturation respectively. The adsorption capacity of methylene blue by MMT/γ-PGA composite increased with the increasing of pH values of methylene blue solution. Meanwhile, the study of adsorption mechanism demonstrated that the adsorption of methylene blue by MMT/γ-PGA composite was Langmuir type, and the adsorption equation wasΓ=0.204c/(1+0.381C).
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6

Huang, Zhao Long, Shao Ping Feng, Yan Jiang, Rui Min Xiao, Li Da Sun, and Shun Li Lu. "Improvement on Determination of the Adsorption Value of Activated Carbon on Methylene Blue." Advanced Materials Research 1033-1034 (October 2014): 579–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.579.

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Characteristics of absorption of activated carbon on methylene blue were studied. It was demonstrated that adsorption of activated carbon on methylene blue was very stable on monomolecular adsorption and when multimolecular adsorption existed adsorption became to be weak. An improved method was suggested that many samples were tested adsorption of activated carbon on methylene blue in parallel experiment and certain sample was selected to use in next experiment, its color should approximate to the color of 0.4% CuSO4 but darker slightly and activated carbon loaded methylene blue was added some fresh phosphate buffer solution to desorb methylene blue on the activated carbon, testing absorption value total concentration of methylene blue in the solutionin (merging the first and second experiment) by spectrophotometer, calculating adsorption value on difference method which original volume of methylene blue added subtracts rest of methylene blue in the solution after adsorption. The new method was simple, rapid and easy. word times would shorten obviously.
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7

Zhao, Lin Xiu, Si Guo Yuan, Jiao Sha, and Shao Bin Li. "Hypercrosslinked Polymers Preparation VS Methylene Blue Adsorption." Materials Science Forum 743-744 (January 2013): 539–44. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.539.

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In the study, two kinds of hypercrosslinked polymers were prepared by polymerization of dichloromethyl aryl monomer with benzene or itself. The chemical and pore structure of above polymers were characterized by FT-IR and BET. The results showed that these polymers possessed high BET specific surface area (up to 1000 m2/g) and large pore volumes (up to 1.2cm3/g). Two commercial polymer adsorbent (XAD-4, H103) and two new synthesized polymeric adsorbents (BE-XDC, CMB-CMB) have been used for the adsorption of reactive dye methylene blue (MB) from aqueous solution, and the static capacity followed an order as: CMB-CMB(142.77mg/g) > BE-XDC(104.61mg/g) > H103(71.01mg/g) > XAD-4(53.85mg/g). The Equilibrium adsorption data of the four polymeric adsorptions were obtained and fitted very well to Freundlich model. The adsorption equilibrium time of CMB-CMB, BE-XDC resin were less than 200min, which were faster than that of XAD-4, H103. The free energy changes, ΔG for adsorption of MB on the four polymeric adsorbents in the aqueous solution was evaluated. The negative values of ΔG indicated that the overall adsorption processes were spontaneous and thermodynamically favorable.
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8

Garcia, Ronald Vieira, Magno de Lima Silva, Victor Emanuel de Morais Oliveira, Vitória Catarina Cardoso Martins, Josiney Farias de Araújo, Erival Gonçalves Prata, and Leandro Marques Correia. "Materials for methylene blue adsorption." Research, Society and Development 10, no. 9 (July 28, 2021): e37410918114. http://dx.doi.org/10.33448/rsd-v10i9.18114.

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Adsorption is a surface phenomenon, in which the adsorbate is adhered to an adsorbent material and have been study for the removal of textile dyes, which have high toxicity to the aquatic environment. One of the dyes that stands out is methylene blue, which is organic, basic, aromatic, heterocyclic and molecular formula (C16H18ClN3S). In this study, we aim was to carry out a bibliography review in national and international scientific journals with articles published in the period from 2005 to 2019, of the adsorbent materials for the adsorption of the methylene blue dye. The materials reported are: mango seed powder, wheat husks, activated carbon obtained from rattan sawdust, activated carbon prepared from coconut shell, garlic shell, NaOH modified pummell shell, activated carbon (coconut shell and modified with NaOH), activated carbon (pea peel), HCl modified watermelon peel, potato peel, ZnCl2 activated cashew nut peel, mesoporous carbon obtained from fish scales, pineapple peel and bamboo. Our review indicate that the adsorbent materials found in the literature for methylene blue adsorption have high adsorption capacities. The adsorption capacities are high and depend on several parameters, which influence the adsorption (pH of the medium, mass and particle size of the adsorbent material, concentration of adsorbate (methylene blue), temperature and time of contact of the adsorbate with the adsorbent.
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9

Rendo, Donatus. "Adsorption of Methylene Blue Dye using Fe3O4 Magnetized Natural Zeolite Adsorbent." Jurnal Kimia Sains dan Aplikasi 24, no. 2 (February 24, 2021): 51–57. http://dx.doi.org/10.14710/jksa.24.2.51-57.

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Preparation and characterization of Fe3O4 magnetized natural zeolite adsorbent for adsorption of methylene blue dye have been carried out. Natural zeolite/Fe3O4 adsorbent preparation was carried out using coprecipitation of Fe2+ and Fe3+ ions (1: 2 mol ratio) on the natural zeolite surface. Characterization was carried out using X-Ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR), and Scanning Electron Microscopy (SEM) to determine the effect of Fe3O4 on the natural zeolite surface. UV-Vis spectroscopy was used to determine the concentration of methylene blue after the adsorption process. The characterization results showed that Fe3O4 was successfully embedded in the natural zeolite without damaging the natural zeolite's crystallinity. Natural zeolite/Fe3O4 adsorbent showed easy separation from water medium after the adsorption process. The optimum conditions for adsorption were achieved at the contact time of 60 minutes, and the initial concentration of methylene blue was 30 ppm with an adsorbent mass of 25 mg. Adsorption kinetics followed pseudo-second-order reaction kinetics, and adsorption isotherm followed Langmuir isotherm with an adsorption capacity of 32.258 mg/g.
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10

Taufik, Ardiansyah, and Rosari Saleh. "Adsorption-Sono Degradation Synergetic Removal of Methylene Blue by Magnetic Fe3O4-Nanographene Platelets (Fe3O4-NGP) Composites." Materials Science Forum 864 (August 2016): 106–11. http://dx.doi.org/10.4028/www.scientific.net/msf.864.106.

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The magnetic Fe3O4-nanographene platelets (Fe3O4–NGP) platelets composites with various concentrations of nanographene platelets were used as a catalyst for the removal of methylene blue in aqueous solution. The adsorption and sonocatalytic performances were evaluated using methylene blue in aqueous solution. The effect of NGP content in the Fe3O4–NGP, pH and initial concentrations of methylene blue were investigated. Compared in the dark Fe3O4–NGP shows faster and higher removal efficiency by the adsorption and sonodegradation. It could be concluded that synergy of adsorption and sonodegradation have a significant progress for removal of methylene blue compared with adsorption alone. The removal of methylene blue follows the order adsorption-sonocatalysis > sonocatalysis > adsorption. The predominant oxidative species for degradation of methylene blue was identified to be hydroxyl radicals and holes.
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11

Huang, Zheng-gen, Tao Wang, He-ying Yi, and Xiao-bin Li. "Study on the Adsorption of Methylene Blue from Dye Wastewater by Humulus Japonicus Leaves." E3S Web of Conferences 236 (2021): 03028. http://dx.doi.org/10.1051/e3sconf/202123603028.

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This paper took the objective of preparing high-performance, low-cost biological adsorbent for printing and dyeing wastewater, and the adsorption experiment of dyestuff wastewater with high chromaticity and high biodegradability was studied. The Methylene Blue was adsorbed by the prepared Humulus Japonicus Leaves (HJ), the effects of adsorption time, pH, dosage of adsorbent, initial Methylene Blue concentration and temperature on the adsorption process were investigated, and the adsorption mechanism was described by adsorption isotherm, adsorption thermodynamics and adsorption kinetics, and the results showed that: when HJ was added 0.15g and ph was 7, the temperature was 30°C (303K), adsorption was carried out for 20min, simulated dye wastewater, adsorption efficiency of Methylene Blue of 100mg/l were excellent, adsorption rate reached up to 92%, the equilibrium adsorption rate was positively correlated with the initial concentration of CV dye. Humulus leaves adsorption CV Gibbs free energy of ΔG<0, ΔH>0, ΔS>0 showed spontaneous adsorption process, the adsorption process Methylene Blu was more suitable for the Freundlich isothermal adsorption equation, the adsorption kinetics accorded with the quasi two level kinetic model, the adsorption of the Methylene Blue dye molecule by the HJ was chemically adsorbed as the rate control step, the Methylene Blue molecule was mainly adsorbed on the surface of the Humulus leaves; the model of internal diffusion kinetics showed that there was membrane diffusion and internal diffusion of the HJ in the process of Methylene Blue adsorption. The experimental results showed that HJ as adsorbent can effectively remove Methylene Blue from dye wastewater, and the research results provide a new method and idea for biological treatment of dye wastewater.
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12

Cai, Xiaoxi, Jiang Li, Yunguo Liu, Xinjiang Hu, Xiaofei Tan, Shaobo Liu, Hui Wang, Yanling Gu, and Lerong Luo. "Design and Preparation of Chitosan-Crosslinked Bismuth Ferrite/Biochar Coupled Magnetic Material for Methylene Blue Removal." International Journal of Environmental Research and Public Health 17, no. 1 (December 18, 2019): 6. http://dx.doi.org/10.3390/ijerph17010006.

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Biochar obtained by pyrolysis of the fiber plant kenaf was mixed with bismuth ferrite (BiFeO3) in a chitosan-containing acetic acid solution, magnetized, and modified to prepare a chitosan-crosslinked BiFeO3/biochar coupled magnetic material. The adsorption properties of the composite were investigated using methylene blue dissolved in water, and the effects of external conditions, such as pH, methylene blue concentration, reaction time, and temperature, on the adsorption performance were studied. The adsorption data were fitted and analyzed with kinetic and isotherm models, and the results showed that the BiFeO3/biochar coupled magnetic material effectively adsorbed methylene blue. The amounts adsorbed onto this magnetic material increased with increasing initial methylene blue concentration, reaction time, and temperature, and the adsorption performance improved under neutral and alkaline conditions. The pseudo-first-order kinetic and Langmuir isotherm models satisfactorily fitted the adsorption data, showing that the adsorption of methylene blue involved both chemical and physical adsorption. The maximum adsorption capacity of methylene blue onto the BiFeO3/biochar coupled magnetic material reached 18.942 mg·g−1 at 25 °C, confirming the excellent dye binding activity of this material.
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13

Buaphean, Tanaree, Thamonwan Ketwongsa, and Kowit Piyamongkala. "Coagulation of Chitosan Solution in Commercial Detergent as Adsorbent for Sorption Methylene Blue Dye." Solid State Phenomena 266 (October 2017): 122–27. http://dx.doi.org/10.4028/www.scientific.net/ssp.266.122.

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The chitosan resin forming with commercial detergent solution was used as adsorbent for removal of the methylene blue. The effect of the amount of adsorbent was thoroughly investigated through batch adsorption system. The percent adsorption of methylene blue increased in the same direction as the amount of chitosan resin. The experimental result showed that adsorption capacity onto 0.4 g of chitosan resin was 9.1 mg/g. The Langmuir and the Freundlich adsorption isotherms were applied to describe the methylene blue uptake, which could be explained by Freundlich adsorption isotherm onto chitosan resin. Single-state batch adsorption design of methylene blue onto chitosan resin has been studied, using on the Freundlich isotherm equation.
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14

Kang, Seul-gi, Jinhee Park, and Dong-Su Kim. "Studies on Adsorption Characteristics of Methylene Blue Using Coffee Ground." Journal of Korean Society of Water Science and Technology 28, no. 2 (April 30, 2020): 23–32. http://dx.doi.org/10.17640/kswst.2020.28.2.23.

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15

Maryudi, Maryudi, Shinta Amelia, and Siti Salamah. "Removal of Methylene Blue of Textile Industry Waste with Activated Carbon using Adsorption Method." Reaktor 19, no. 4 (December 31, 2019): 168–71. http://dx.doi.org/10.14710/reaktor.19.4.168-171.

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The colorant that is often used in the textile industry is methylene blue which is a cationic heterocyclic aromatic compound. This compound is very stable and is difficult to decompose naturally leading to environment in large concentrations. Therefore, a waste treatment technology to reduce the concentration of dye waste in water becomes importannt. So far, adsorption method with activated carbon remains the most efficient and effective technique in removing dyes from liquid waste due to its relatively large adsorption capacity. Activated carbon is one of the non-metallic mineral commodities or multipurpose industrial minerals, one of which is as an adsorbent or adsorbent media. This study aims to determine the potential of activated carbon in adsorbing methylene blue with variations in the concentration of methylene blue and particle size of activated carbon. The procedures in this experiment include, the preparation of activated carbon with size variations (20-60, 60-100 and> 100 mesh) and variations in the concentration of methylene blue (15 ppm, 30 ppm and 45 ppm) with contact time (0 to 180 minutes). From the results of the study, it was found that the smaller the size of activated carbon used, the greater the adsorption capacity, ie at mesh size> 100 mesh, the adsorption capacity was 9.8%. Whereas, the smaller the concentration of methylene blue, the activated carbon could work optimally at a concentration of 15 ppm at 30 minutes with adsorption capacity as high as 100%.Keywords: adsorption; Methylene Blue; activated carbon; concentration; time; particle size
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16

Zhou, Dong Ju, Xian Rui Li, Hui Ni, and Si Guo Yuan. "Removal of Cationic Dyes by Polyphenylene Sulfide-Based Strong Acid Ion Exchange Fiber." Materials Science Forum 743-744 (January 2013): 567–72. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.567.

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PPS-based strong acid ion exchange fiber was used to absorb cationic dye basic fuchsin and methyl blue in solution. The experimental results showed that the amount of methylene blue and basic fuchsin absorbed increased respectively with increasing of initial concentration from 100 to 600 mg/L. The adsorption capacity of the fiber was up to 604.81mg/g of basic fuchsin and to 618.94mg/g of methylene blue. The removal rate of the methylene blue reached 99.9% from 100 to 500mg/L, but of basic fuchsin from 100 to 300mg/L. Adsorption kinetic equation for basic fuchsin can be expressed as a pseudo-second-order dynamic process. The fiber is to be perfect prospect for the wastewater treatment because of its high adsorptive capacity and diffusion rate.
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17

Deng, Jie, Ai He Wang, and Chun Zhang. "Study on Absorption Experiment of Methylene Blue by Nitrifying Peat." Applied Mechanics and Materials 209-211 (October 2012): 1969–72. http://dx.doi.org/10.4028/www.scientific.net/amm.209-211.1969.

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A modified peat was prepared by using nitrate and natural peat from Yiyang city in Hunan Province. The adsorption properties of the nitrifying peat for Methylene blue was investigated in aqueous solution. The effect of the adsorbent dosage, time and the initial concentration of methylene blue on the adsorption capability was discussed. The result showed that time and the adsorbent dosage had greater influence on the adsorption of Methylene blue, the adsorption of Methylene blue by Nitrifying peat was a rapid process, and in 20 min in the adsorption rate reached more and 60%, the adsorption amount was approximately proportional to the initial concentration( 20-100 mg /L). Langmuir and Freundlich isotherms were used to fit the equilibrium data, and it was found that the adsorption isotherm followed the Langmuir model.
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18

Siswanta, Dwi, Rizky Wahyuni, and Mudasir Mudasir. "Synthesis of Glutaraldehyde-Crosslinked Carboxymethyl Cellulose-Polyvinyl Alcohol Film as an Adsorbent for Methylene Blue." Key Engineering Materials 840 (April 2020): 35–42. http://dx.doi.org/10.4028/www.scientific.net/kem.840.35.

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The glutaraldehyde (GA)-crosslinked carboxymethyl cellulose (CMC)-polyvinyl alcohol (PVA) film had been synthesized and used as a methylene blue adsorbent. The films were prepared using a solution casting technique and characterized using FTIR spectrophotometer, SEM. Adsorption studies include pH, contact time, methylene blue initial concentration. Furthermore, the desorption study of films was carried out using NaCl, HCl and distilled water. The results of FTIR characterization showed similarities between the spectra of CMC-PVA-GA films with their component materials. The SEM image of CMC-PVA-GA films showed a non-porous surface. In the adsorption study, GA-crosslinked CMC-PVA films (1:2 w/w) exhibited the largest adsorption capacity of methylene blue at optimum conditions for adsorption at pH 7, contact time 200 min, methylene blue concentration of 200 mg L–1 which was 194 mg g–1. Methylene blue adsorption kinetic followed the pseudo second-order kinetic model and the Langmuir adsorption isotherm model. The desorption studies show that adsorption takes place through an ion exchange mechanism.
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19

Chrisyanti, Desriana, Gunawan Gunawan, and Abdul Haris. "Blue Methylene Retrieval using Silica-Salicylic Acid Modified Filtering." Jurnal Kimia Sains dan Aplikasi 21, no. 1 (January 31, 2018): 19–23. http://dx.doi.org/10.14710/jksa.21.1.19-23.

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The retrieval of methylene blue using a silica-modified sulfide-salicylic acid has been carried out. Salicylate-silica-acid alloys have been prepared by comparing the four media ie filter paper, silica-filter paper, salicylic acid-filter paper and salicylic acid-silica-filter paper. This study aims to study the recovery of methylene blue using salicylic acid-modified silica filtering with various parameters on the adsorption and desorption process. The results showed that the salicylic acid-silica alloy could improve the capability of methylene blue removal. The result of pH variation on the adsorption process showed that at pH 7 methylene blue can be taken 92.89%. Whereas at concentration variation, salicylic acid at 5 mM can take methylene blue equal to 92.86%. The desorption results showed that pH 1 methylene blue could be desorbed at 308.89 mg/g, while the variation of contact time of desorption ie at 110 minutes could an saturate the blue methylene by 589,61 mg/g. The UV-Vis analysis showed a decrease in absorbance in salicylic acid after contact with silica. The FTIR analysis also shows that in salicylate-silica-acid alloys there are Si-O groups derived from silica and C = O derived from salicylic acid.
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20

Azis, Thamrin, La Ode Ahmad, Keke Awaliyah, and Laode Abdul Kadir. "Study of Kinetics and Adsorption Isotherm of Methylene Blue Dye using Tannin Gel from Ceriops tagal." Jurnal Kimia Sains dan Aplikasi 23, no. 10 (September 22, 2020): 370–76. http://dx.doi.org/10.14710/jksa.23.10.370-376.

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Research on the equilibrium and adsorption kinetics of methylene blue dye using tannin gel from the Tingi tree (Ceriops tagal) has been carried out. This study aims to determine the capacity and adsorption kinetics of tannin gel against methylene blue dye. Several parameters, such as the effect of contact time, pH, and methylene blue dye concentration on adsorption, were also studied. Based on the research results, the optimum adsorption process is a contact time of 30 minutes and a pH of 7. The adsorption capacity increased to a concentration of 80 mg/L with a maximum adsorption capacity (qm) of 49.261 mg/g. The adsorption process follows the pseudo-second-order adsorption kinetics model and the Langmuir isotherm model.
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21

Agnestisia, Retno. "Synthesis & Characterization of Magnetit (Fe3O4) and Its Applications As Adsorbent Methylene Blue." Jurnal Sains dan Terapan Kimia 11, no. 2 (October 3, 2017): 61. http://dx.doi.org/10.20527/jstk.v11i2.4039.

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Synthesis, characterization and adsorption study of magnetite have beenconducted. Magnetite was synthesized by coprecipitation method. The characterizations of magnetite were carried out with spectroscopy FTIR (Fourier Transform Infrared) and XRD (X-ray diffraction). The adsorption study was conducted using a batch system with the studied adsorption study including optimum pH, optimum contact time and adsorption equilibrium. The results showed that coprecipitation method has succeeded to form magnetite that has magnetism properties. Magnetite can adsorbed methylene blue from aqueous phase, with the maximum adsorption at pH 5 and contact time of 90 minutes.Adsorption of methylene blue by magnetite follows the adsorption pattern of the Langmuir isotherm with the adsorption energy of 25.59 kJ/mol and adsorption capacity of 43.86 mg/g. The results of magnetite synthesis can accelerate the process of separating the adsorbent particles in a methylene blue solution using an external magnetic field.Keywords : magnetite, coprecipitation, adsorption, and methylene blue.
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22

Rais, Iget, Nurhaeni, Ruslan, and Dwi Juli Pusptasari. "BIOSORBEN KITOSAN CANGKANG KEONG SAWAH TERHADAP PENYERAPAN ZAT WARNA METHYLENE BLUE." KOVALEN: Jurnal Riset Kimia 5, no. 2 (August 31, 2019): 214–21. http://dx.doi.org/10.22487/kovalen.2019.v5.i2.12826.

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Biosorbent studies on methylene blue absorption using chitosan from rice conch shell have been carried out. This research was carried out with variations in contact time of 1, 2, 3, 4, 5, and 6 hours with the aim to determine the contact time required to adsorb Methylene Blue dyes by chitosan from rice conch shell with the highest adsorption capacity. The results showed that the contact time required to adsorb Methylene Blue dye by a chitosan from rice conch shell was 6 hours with the highest adsorption capacity of 85.05%. Keywords: Chitosan, adsorption, Methylene Blue
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23

Fisli, Adel, Rahma Dina Safitri, Nurhasni Nurhasni, Sari Hasnah Dewi, and Deswita Deswita. "ISOTHERM, KINETICS AND THERMODYNAMICS ADSORPTION STUDIES OF DYE ONTO Fe3O4-WASTE PAPER ACTIVATED CARBON COMPOSITES." Jurnal Teknologi 83, no. 1 (December 7, 2020): 45–55. http://dx.doi.org/10.11113/jurnalteknologi.v83.14991.

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This paper focused on the studying of adsorption properties of Fe3O4-waste paper activated carbon composites for the removal of methylene blue dyes from water. The various parameters were carried out for the adsorption test of the composites, namely; contact time, adsorbent dose, initial MB concentration, pH solution, and temperature. The adsorption of isotherm, thermodynamics and kinetic was used to determine the characteristics of methylene blue adsorption onto the prepared adsorbent. The result indicates that the optimum adsorption capacity has occurred at pH = 6 in water solution. The adsorption capacity increase as the temperature increase until at 315K (45oC). The Langmuir isotherm is more appropriate to be applied as the adsorption model with the maximum adsorption capacity (qm) value of 101 and 93 mg/g for KA HCl-Fe3O4 and KA-Fe3O4 composites, respectively. The value of adsorption thermodynamic parameters was positive for ΔH, negative for ΔGo and positive for ΔSo, meaning the process adsorptions were endothermic, feasibility and spontaneity and randomness, respectively. The pseudo-second-order model was appropriate to predict the kinetic models for methylene blue adsorption onto the composites. The obtained adsorbent composites possess high adsorption efficiency and rapid magnetic separation. They were a promising for practical wastewater treatment for dyes removal from water.
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24

Ghosh, Dipa, and Krishna G. Bhattacharyya. "Adsorption of methylene blue on kaolinite." Applied Clay Science 20, no. 6 (February 2002): 295–300. http://dx.doi.org/10.1016/s0169-1317(01)00081-3.

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25

Chen, Guangming, Jingjun Pan, Busing Han, and Haike Yan. "Adsorption of Methylene Blue on Montmorillonite." Journal of Dispersion Science and Technology 20, no. 4 (June 1999): 1179–87. http://dx.doi.org/10.1080/01932699908943843.

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26

Bello, Olugbenga Solomon, Oladipo Mary Adelaide, Misbaudeen Abdul Hammed, and Olalekan Abdul Muiz Popoola. "Kinetic and equilibrium studies of methylene blue removal from aqueous solution by adsorption on treated sawdust." Macedonian Journal of Chemistry and Chemical Engineering 29, no. 1 (June 15, 2010): 77. http://dx.doi.org/10.20450/mjcce.2010.181.

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The aim of this study is to use treated sawdust as an adsorbent for the removal of methylene blue (MB) dye. The adsorption equilibrium and kinetics of methylene blue dye on this adsorbent were then examined at 25 ºC. The adsorption isotherm of the methylene blue on the treated adsorbent was determined and correlated with common isotherm equations. The sorption data were then correlated with the Langmuir and the Freundlich adsorption isotherm models. The Langmuir isotherm exhibited a better fit for the adsorption data than the Freundlich isotherm with maximum monolayer adsorption capacity of 236.16 mg g–1. The kinetics of methylene blue adsorption on the treated adsorbent has also been studied by fitting the data in the Lagergren’s first order, the Ho-McKay’s pseudo second order, the Elovich and the Intraparticulate kinetic models. It was observed that the removal of methylene blue over the treated adsorbent undergoes the second order processes at all the concentrations of the dye. The kinetic parameters of this best-fit model were calculated and discussed.
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27

Chen, Ping Hua, Xue Zhen Zhou, Yong Xiu Li, Dong Ping Li, Jing Li, and Yan Zhu Liu. "Kinetic and Thermodynamic Study Adsorbing Methylene Blue on Nanozirconia." Applied Mechanics and Materials 475-476 (December 2013): 1311–19. http://dx.doi.org/10.4028/www.scientific.net/amm.475-476.1311.

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In present study, uniformed nanozirconia is obtained via precipitation, ball milling and spray drying. The characteristics of methylene blue adsorption by nanozirconia are studied in details. The morphology of nanozirconia is examined by SEM. The influence of temperature is studied to obtain the optimal adsorption conditions. The equilibrium adsorption isotherms and the kinetic properties of the adsorption process are investigated to study the mechanism. The thermodynamic properties of methylene blue adsorption is investigated, and the thermodynamic parameters of Gθ, Hθ and Sθ are calculated. The results show nanozirconia has high adsorption ability of 43.99 mg/g to methylene blue, and the adsorption reaction is a spontaneous and physic-sorption process.
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28

Yuan, Ning, Hui Cai, Tian Liu, Qi Huang, and Xinling Zhang. "Adsorptive removal of methylene blue from aqueous solution using coal fly ash-derived mesoporous silica material." Adsorption Science & Technology 37, no. 3-4 (February 7, 2019): 333–48. http://dx.doi.org/10.1177/0263617419827438.

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In the present work, coal fly ash-derived mesoporous silica material (CFA-MS) has been successfully fabricated without employing any extra silica source. The obtained CFA-MS was characterized by Fourier transform infrared spectroscopy, nitrogen adsorption–desorption measurement, powder X-ray diffraction and transmission electron microscopy. Nitrogen adsorption–desorption measurement disclosed that CFA-MS possesses Brunauer–Emmett–Teller-specific surface area of 497 m2·g−1 and pore volume of 0.49 cm3·g−1, respectively. Furthermore, CFA-MS was evaluated for the adsorptive removal of methylene blue from aqueous solution. Several influence parameters on the removal of methylene blue including contact time, pH, initial concentration and temperature were studied in detail. Moreover, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models were employed for interpretation of the adsorption process, while the pseudo-first-order and pseudo-second-order kinetics equations were applied to investigate the adsorption kinetics. Results in the current work demonstrate that CFA-MS can be used as an efficient adsorbent for methylene blue removal.
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29

Fang, Run. "Preparation of Corncob-Based Bio-Char and its Application in Removing Basic Dyes from Aqueous Solution." Advanced Materials Research 550-553 (July 2012): 2420–23. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.2420.

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This study presents the preparation of corncob-based bio-char and its application in adsorptive removal of three basic dyes (methylene blue, crystal violet and basic fuchsin) from aqueous solution. The adsorption behavior of basic dyes on bio-char was investigated via batch experiments. Experimental results showed that the adsorption efficiency of bio-char increased with increasing solution pH and temperature. Thermodynamic parameters demonstrated the spontaneous and endothermic nature of the adsorption. The dye removal process fitted the Langmuir isotherm well. The adsorption capacity of bio-char for methylene blue, crystal Violet and basic fuchsin at 25°C was calculated to be 126.58, 81.96 and 75.18 mg/g, respectively.
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30

Srisorrachatr, Siriwan. "Study of Dyestuff Removal from Solution by Sunflower Seed Husk." Advanced Materials Research 236-238 (May 2011): 3016–19. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.3016.

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The removal of dyes from synthetic wastewater by sunflower husk was studied in batch and dynamics removal. The extent of adsorption was studied in batch as a function of burning temperature, chemical treatment, adsorbents size, pH and solution temperature. Methylene blue and Mexican red in aqueous solution was used as synthetic wastewater. Dynamic removal of methylene blue and Mexican red by sunflower husk was also studied in packed bed column. In batch, both dyes were removed with the maximum adsorption by unburned adsorbents. Removal of methylene blue was increased when the adsorbents treated with NaOH whereas treated with HCl for Mexican red. The optimum pH for removal of methylene blue solution was between 4 and 10 and the maximum value for Mexican red was pH 2. The adsorption of methylene blue and Mexican red follows Langmuir adsorption model. In packed bed column, values of column parameter were investigated as a function of flow rate and bed height. Dynamic of adsorption process was modeled by bed depth service time (BDST) and the experimental data were fitted very well to the BDST model
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31

Zhang, Mengmeng, Hongchao Yu, and Bibo Chen. "Facile synthesis of EDTA-functionalized halloysite nanotubes for the removal of methylene blue from aqueous phase." Canadian Journal of Chemistry 97, no. 4 (April 2019): 259–66. http://dx.doi.org/10.1139/cjc-2018-0247.

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EDTA-functionalized halloysite nanotubes (EDTA-HNTs) were synthesized by a two-step method. The structures of the EDTA-HNTs were analyzed by Fourier-transform infrared spectra, X-ray diffraction, thermogravimetric analysis, and transmission electron spectroscopy. Then, the EDTA-HNTs were applied as adsorbents for the removal of methylene blue from aqueous phase. Adsorption of methylene blue onto EDTA-HNTs was investigated with respect to adsorbent dose, contact time, initial methylene blue concentration, and temperature. A maximum adsorption capacity of 115.8 mg/g for methylene blue onto EDTA-HNTs at room temperature was achieved. The adsorption kinetics could be described by the pseudo-second-order model. Both the Langmuir and Freundlich models were employed to describe the adsorption isotherms, and the results presented that the equilibrium data obeyed the Langmuir model. Thermodynamic parameters of ΔG0 and ΔH0 verified the spontaneous and exothermic nature of the methylene blue adsorption onto EDTA-HNTs. Moreover, the EDTA-HNTs could be facilely regenerated and efficiently reused, exhibiting a good prospect for the treatment of dye effluents.
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32

Sagita, Christyowati Primi, Limpat Nulandaya, and Yehezkiel Steven Kurniawan. "Efficient and Low-Cost Removal of Methylene Blue using Activated Natural Kaolinite Material." Journal of Multidisciplinary Applied Natural Science 1, no. 2 (April 17, 2021): 69–77. http://dx.doi.org/10.47352/jmans.v1i2.80.

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Clays are low-price and very useful material for water treatment purpose. In this work, we reported the application of activated natural kaolinite material which obtained from Wediombo beach, Yogyakarta for methylene blue adsorption. The natural kaolinite material was activated under an acidic condition to obtain the activated kaolinite material. The activated kaolinite material was characterized using Fourier transform infrared, X-ray diffraction, scanning electron microscope, and surface analysis. From the adsorption experiment, the activated kaolinite material gave moderate adsorption percentages for methylene blue. The adsorption kinetics followed the Ho and McKay kinetic model while the adsorption isotherm followed Langmuir model. The qmax value for methylene blue adsorption using activated natural kaolinite material was at a moderate level (3.40 mg g-1). The plausible adsorption mechanism of methylene blue on the surface of activated kaolinite material happened through hydrogen bondings and/or electrostatic interactions. These findings are important for a wastewater treatment using a low-cost adsorbent material.
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33

El-Khatib, Ahmed M., N. S. Yousef, Z. F. Ghatass, Mohamed S. Badawi, M. M. Mohamed, and Mostafa Elkhatib. "Synthesized Silver Carbon Nanotubes and Zinc Oxide Nanoparticles and their Ability to Remove Methylene Blue Dye." Journal of Nano Research 56 (February 2019): 1–16. http://dx.doi.org/10.4028/www.scientific.net/jnanor.56.1.

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A promising rotating arc discharge method has been developed for producing high purity silver carbon nanotube and zinc oxide nanoparticles, to study their capacities for methylene blue (MB) dye removal under different conditions such as contact time, initial methylene blue dye ion concentration, solution pH, and adsorbent dose. The equilibrium isotherm data were analyzed using Langmuir, Freundlich, Temkin isotherms. Correlation coefficients indicated the following order to fit isotherms for silver carbon nanotube: Freundlich > Langmuir > Temkin. On the other hand, for zinc oxide nanoparticles, the following adjustment founded to fit isotherms was: Langmuir > Temkin> Freundlich. Furthermore, separation factors and distribution coefficients of Methylene blue (MB) dye were calculated. Adsorption kinetic data were analyzed using pseudo-first and second -orders and Elovich model. Film and intraparticle Diffusion model were used to investigate Adsorption mechanism. Kinetic studies showed that the adsorption of methylene blue onto silver carbon nanotubes followed Elovich kinetic model, and the rate of adsorption is controlled by the liquid film diffusion model. Adsorption of methylene blue on zinc oxide nanoparticles followed the pseudo-second-order kinetic model, and the rate of adsorption is controlled by the intraparticle diffusion model.
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34

Mohd Shaid, Mohd Shafiq Hakimi, Muhammad Abbas Ahmad Zaini, and Noor Shawal Nasri. "Isotherm studies of methylene blue adsorption onto waste tyre pyrolysis powder-based activated carbons." Malaysian Journal of Fundamental and Applied Sciences 13, no. 4 (December 26, 2017): 671–75. http://dx.doi.org/10.11113/mjfas.v13n4.924.

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This study was aimed to investigate the adsorptive ability of activated carbons derived from waste tyre pyrolysis powder by CO2 activation and ZnCl2 activation. The derived activated carbons and char were characterized for yield and specific surface area. Methylene Blue dye was used as a model pollutant to probe the performance of activated carbons. Result shows that the CO2-activated waste tyre pyrolysis powder exhibits a higher surface area of 97.0 m2/g, hence a greater methylene blue removal capacity of 47.2 mg/g. The methylene blue adsorption data by activated carbons and char obeyed the Langmuir isotherm with R2 of more than 0.99, describing the monolayer adsorption onto homogeneous surface. Physical activation of waste tyre pyrolysis powder using CO2 yields activated carbon with a promising performance for dyes removal from water.
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35

Zhou, Yue, Wei Guo Pan, Rui Tang Guo, Xiao Bo Zhang, Xue Ping Wen, and Ming Fu He. "Absorption Performance of Activated Carbon with Orange Peel through Phosphoric Acid Activation Method." Advanced Materials Research 518-523 (May 2012): 2298–302. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.2298.

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In order to reduce power plant nitric oxide emission with gaining economical adsorbent, activated carbon was prepared from the raw materials of orange peel under different operating conditions in this paper. The methylene blue adsorption value of different activated carbon has also been tested, and the effects on the methylene blue adsorption performance of different dipping concentration, activation time and carbonization temperature were studied. The finding is that the dipping concentration has the most important impact on methylene blue adsorption value. The highest methylene blue adsorption value of orange peel activated carbon has shown as 277.746mg/g under the following conditions: phosphoric acid concentration was 40%, activation time was 12 hours and carbonization temperature was 500°C. It is a economically feasible absorbent material through a great deal of experiments and analysis.
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36

Hassan, Mohd Sukri, Khairul Adli Nikman, and Fisal Ahmad. "Removal of methylene blue from aqueous solution using cocoa (Theobroma cacao) nib-based activated carbon treated with hydrochloric acid." Malaysian Journal of Fundamental and Applied Sciences 14, no. 2 (June 3, 2018): 193–97. http://dx.doi.org/10.11113/mjfas.v14n2.770.

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Chemical activation process was applied to prepare a cocoa nib-based activated carbon using potassium carbonate (K2CO3). The performance of the activated carbon in removing Methylene Blue from aqueous solution was investigated by batch adsorption studies. The adsorptive properties were studied in terms of initial concentration (C0: 100-300 mg/L) and contact time effects. The experimental isotherm data fitted well the Langmuir and Temkin models. The adsorption kinetic followed the pseudo-second-order model and Boyd model explained the mechanism of adsorption. The results indicate that the chemically produced activated cocoa nib carbon has significant potential to be used as an adsorbent material for adsorption of Methylene Blue from aqueous solution.
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37

Momcilovic, Milan, Milovan Purenovic, Milena Miljkovic, Aleksandar Bojic, and Marjan Randjelovic. "Adsorption of cationic dye methylene blue onto activated carbon obtained from horse chestnut kernel." Chemical Industry 65, no. 2 (2011): 123–29. http://dx.doi.org/10.2298/hemind101027077m.

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Horse chestnut kernel was used as the precursor for the preparation of powdered activated carbon using phosphoric acid as the activating agent. Batch adsorption experiments for the adsorption of cationic dye methylene blue from aqueous solutions were carried out using the obtained carbon as adsorbent. Equilibrium and kinetic experiments were conducted. The equilibrium data were fitted with the Langmuir, Freundlich and Temkin theoretical isotherm models. The best results was obtained in the case of Langmuir model, which indicates that monolayer adsorption occurs on finite number of the active adsorption sites on the carbon surface. The kinetic data were fitted with pseudo-first, pseudo-second, Elovich and interparticle diffusion model. Pseudo-second order model and Elovich model showed the best results of the kinetic data. The increasing of the solution pH led to a higher uptake of methylene blue due to the fact that competitive adsorption of methylene blue cation and proton exists in acidic solutions. The adsorption capacity for methylene blue in equilibrium study was significant (168.93 mg g-1). Comparison of the adsorption capacities of methylene blue onto activated carbons derived from various alternative precursors proves chestnut kernel to be efficient and low-cost material which could be substantially deployed in the future.
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38

Enenebeaku, Conrad Kenechukwu, Nnaemeka John Okorocha, Uchechi E. Enenebeaku, and Benedict Ikenna Onyeachu. "Adsorption of Methylene Blue Dye onto Bush Cane Bark Powder." International Letters of Chemistry, Physics and Astronomy 76 (October 2017): 12–26. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.76.12.

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The adsorption of methylene blue (MB) dye on bush cane bark powder has been studied by analyzing the effect of contact time, initial dye concentration, adsorbent dose, pH, and temperature on the amount of the MB dye adsorbed per unit mass of the bush cane bark powder adsorbent. An optimum adsorption could be achieved during 80 min contact time but, thereafter, decreased with contact time beyond 80 min. The adsorption of the methylene blue dye increased with increasing the initial dye concentration, temperature and pH. However, the amount of methylene blue adsorbed decreased with increasing the dosage of the adsorbent; a phenomenon attributed to a plausible agglomeration of the adsorbent and blocking of the preferred adsorption sites with increasing adsorbent dosage. The adsorption mechanism of the dye obeyed the Freundlich isotherm. Kinetic studies showed that the methylene blue adsorption onto bush cane bark powder adsorbent followed a second order reaction kinetics. The adsorbent was characterized by Fourier transform infra-red spectrophotometer and scanning electron microscope analysis.
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39

Ndi Nsami, Julius, and Joseph Ketcha Mbadcam. "The Adsorption Efficiency of Chemically Prepared Activated Carbon from Cola Nut Shells by on Methylene Blue." Journal of Chemistry 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/469170.

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The adsorption of methylene blue from aqueous solution onto activated carbon prepared from cola nut shell has been investigated under batch mode. The influence of major parameters governing the efficiency of the process such as, solution pH, sorbent dose, initial concentration, and contact time on the removal process was investigated. The time-dependent experimental studies showed that the adsorption quantity of methylene blue increases with initial concentration and decreasing adsorbent dosage. The equilibrium time of 180 min was observed and maximum adsorption was favoured at pH 3.5. The dye removal using 0.1 g of adsorbent was more than 90%. This dosage (0.1 g) was considered as the optimum dosage to remove methylene blue from aqueous solutions. The equilibrium adsorption data were analyzed by the Freundlich, Langmuir adsorption isotherm models. The kinetics of methylene blue solution was discussed by pseudo-first-order, pseudo-second-order, and Elovich models. The adsorption process follows the Elovich rate kinetic model, having a correlation coefficient in the range between 0.9811 and 1.
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40

Li, Li Xia, and Xin Dong Zhai. "Adsorption of Methylene Blue on Modified Bentonite." Advanced Materials Research 726-731 (August 2013): 2380–83. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.2380.

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Modified bentonite was used as adsorbent for the methylene blue adsorption in a batch process. Experimental results show that the adsorption kinetics is well described by pseudo-second-order model and the equilibrium data was better represented by the Freundlich isotherm model. The results revealed that the modified bentonite has the potential to be used as a good adsorbent for the removal of methylene blue from aqueous solutions.
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41

Aldasheva, N. "Determination of the Adsorption Activity of the Specific Surface of Artificial Graphite by the Indicator of Methylene Blue." Bulletin of Science and Practice 6, no. 4 (April 15, 2020): 252–56. http://dx.doi.org/10.33619/2414-2948/53/29.

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This article investigated and determined the specific surface area of artificial graphite for adsorption through a methylene blue solution. The study showed that the specific surface area of graphite adsorption obtained from coal from the Uzgen deposit in Kyrgyzstan for methylene blue is 599.4 m2/g and this is very close to the performance of activated carbons. The specific surface area of artificial graphite obtained from coal from the Uzgen deposit for adsorption activity was determined by titration of a suspension with a methylene blue indicator solution.
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42

Nkutha, C. S., N. D. Shooto, and E. B. Naidoo. "Adsorption of Cr(VI), Pb(II) Ions and Methylene Blue Dye from Aqueous Solution using Pristine and Modified Coral Limestone." Asian Journal of Chemistry 32, no. 10 (2020): 2624–32. http://dx.doi.org/10.14233/ajchem.2020.22815.

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This work reports the feasibility of using pristine and chemically modified coral limestones by acid and base. Their potential adsorptive capabilities is probed by treatment of toxic Cr(VI), Pb(II) ions and methylene blue in aqueous solution under different experimental parameters by batch method. Parameters such as agitation time, concentration, temperature and pH were varied to understand the sorption behaviour of the adsorbents in each case. The adsorbents were characterized by SEM, XRD and FTIR. Morphological analysis by SEM micrographs show that the surface of all adsorbents was irregular in nature. XRD spectra confirmed the orthorhombic structure of aragonite in the pristine coral limestones (PCL), acid modified coral limestones (ACL) and base modified coral limestones (BCL). FTIR results affirmed the presence of (CO3 2-) and (-C=O) groups of the carbonate ions and Ca-O attachment to the surface of PCL and removal of CaCO3 characteristic peaks in ACL and BCL. However, in the modified adsorbents shifting of Ca-O peaks occurred. The recorded maximum adsorption capacities of PCL, ACL and BCL for Cr(VI) ions were 69.42, 65.04, 64.88 mg/g, Pb(II) ions 39.36, 74.11, 78.34 mg/g and methylene blue 37.24, 46.28, 46.39 mg/g, respectively. The uptake of Pb(II), Cr(VI) ions, methylene blue onto PCL fitted Freundlich model. Also the uptake of Cr(VI) ions and methylene blue onto ACL and BCL fitted Freundlich isotherm. However, uptake of Pb(II) ions onto both ACL and BCL fitted Langmuir isotherm. The data revealed that the adsorption of Pb(II) ions onto PCL and ACL and methylene blue dye onto PCL was exothermic. Whilst the adsorption of Cr(VI) ions onto PCL, ACL and BCL and methylene blue dye onto ACL and BCL were endothermic in nature, hence increasing the temperature would enhance the uptake of Pb(II) ions onto BCL, Cr(VI) ions onto ACL and BCL and methylene blue onto ACL and BCL. The obtained (ΔGº) values at all studied temperatures for the adsorption of Pb(II), Cr(VI) ions and methylene blue onto PLC, ACL and BCL indicated a spontaneous process.
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43

Mi, Bingbing, Jingxin Wang, Hongzhong Xiang, Fang Liang, Jianfei Yang, Zixing Feng, Tao Zhang, et al. "Nitrogen Self-Doped Activated Carbons Derived from Bamboo Shoots as Adsorbent for Methylene Blue Adsorption." Molecules 24, no. 16 (August 20, 2019): 3012. http://dx.doi.org/10.3390/molecules24163012.

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Bamboo shoots, a promising renewable biomass, mainly consist of carbohydrates and other nitrogen-related compounds, such as proteins, amino acids and nucleotides. In this work, nitrogen self-doped activated carbons derived from bamboo shoots were prepared via a simultaneous carbonization and activation process. The adsorption properties of the prepared samples were evaluated by removing methylene blue from waste water. The factors that affect the adsorption process were examined, including initial concentration, contact time and pH of methylene blue solution. The resulting that BSNC-800-4 performed better in methylene blue removal from waste water, due to its high specific surface area (2270.9 m2 g−1), proper pore size (2.19 nm) and relatively high nitrogen content (1.06%). Its equilibrium data were well fitted to Langmuir isotherm model with a maximum monolayer adsorption capacity of 458 mg g−1 and a removal efficiency of 91.7% at methylene blue concentration of 500 mg L−1. The pseudo-second-order kinetic model could be used to accurately estimate the carbon material’s (BSNC-800-4) adsorption process. The adsorption mechanism between methylene blue solution and BSNC-800-4 was controlled by film diffusion. This study provides an alternative way to develop nitrogen self-doped activated carbons to better meet the needs of the adsorption applications.
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44

Huang, Cheng Qun, Xue Zhang, Da Chuan Qiu, and Hong Juan Wei. "Research on Adsorption of Methylene Blue onto the Mesoporous Silica Microspheres." Advanced Materials Research 557-559 (July 2012): 427–33. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.427.

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Mesoporous silica microspheres (MSM) with diameter about 100 nm were prepared by hydrothermal synthesis using cetyl trimethyl ammonium bromide(CTAB) as template agent and tetraethyl orthosilicate(TEOS) as silica source. And they were characterized byscanning electron microscopy (SEM) , N2 adsorption-desorption analysis , infrared spectroscopy (FT-IR). Then methylene blue adsorption test was investigated. Effect of pH, temperature of the adsorption of methylene blue onto MSM were studied. The adsorption amount onto MSM increased with the initial pH-value of the solution in the range of 3~10. Alkaline was more favorable to adsorption. The adsorption amount onto MSM decreased with the initial temperature of the solution at 22 °C~ 45 °C. low-temperature was more favorable to adsorption. The adsorption isotherm of methylene blue on MSM could be described by the Langmuir model.
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45

Chen, Ping, Xian Jun Lu, and Jun Qiu. "Study on Adsorption Properties of Different Dyes on Montmorillonite." Advanced Materials Research 454 (January 2012): 305–9. http://dx.doi.org/10.4028/www.scientific.net/amr.454.305.

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Using Octadecyltrimethylammonium cations with long carbon chain to modify calcium montmorillonite samples, the adsorption properties of different dyes on montmorillonite before and after modification were investigated. Results showed that the basic dye of methylene blue was easily adsorbed by natual calcium montmorillonite, while the adsorption ability for acid blue and neutral blue was greatly improved when it was organically modified, and the adsorption amount increased with the increasing of modifier dosage. The adsorption ratio was influnced by reaction time, the temperature and the solution’s pH value. It suggested that the adsorption balance time was about 60min; higher temperature was good for acid blue adsorbed on organic montmorillonite, but neutral blue’s adsorption amount was greater at the room temperature; the optimum pH was 9 for methylene blue adsorption, while low pH was better for acid blue and neutral blue adsorption.
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46

Jing, Zhan Xin, Xiao Feng Sun, Qing Ye, and Ya Jing Li. "Hemicellulose-Based Porous Hydrogel for Methylene Blue Adsorption." Advanced Materials Research 560-561 (August 2012): 482–87. http://dx.doi.org/10.4028/www.scientific.net/amr.560-561.482.

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Hemicellulose-based porous hydrogel for methylene blue adsorption from aqueous solution was studied. The surface morphology of sample was analyzed by SEM, finding that it had the porous structure. Effects of pH and initial concentration on the adsorption capacity were investigated. Isotherm studies found that the adsorption of metylene blue onto absorbent was a monolayer adsorption, and the maximum adsorption capacity was 444.44 mg/g. The adsorption mechanism was analyzed by FT-IR, and it showed that the produced -COO- groups in alkaline conditions were advantaged for adsorption process, which offers the impetus for combination of adsorbent and methylene blue. Hemicellulose-based porous hydrogel is an inexpensive and biodegradable material, and can be a promising absorbent for cationic removing from wastewater.
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47

Shi, Yan Peng, Shun Xian Zhong, Meng Lu Wu, and Jian Rong Chen. "Comparing Different Kinds of Materials for Adsorption of Methylene Blue." Applied Mechanics and Materials 651-653 (September 2014): 1331–34. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.1331.

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Methylene blue is an organic dyestuff and damaged to human beings. Graphene-based composite is a new type of nanometer materials and with outstanding adsorption capacity of methylene blue than other materials in aqueous solution. This paper summarized and compared the difference among graphene, graphene-based composites and other materials in removing methylene blue in aqueous solution.
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48

Ngapa, Yulius Dala, and Yasinta Embu Ika. "Optimasi Adsorpsi Kompetitif Pewarna Biru Metilena dan Metil Oranye Menggunakan Adsorben Zeolit Alam Ende - Nusa Tenggara Timur (NTT)." Indo. J. Chem. Res. 8, no. 2 (September 30, 2020): 151–59. http://dx.doi.org/10.30598//ijcr.2020.8-ydn.

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Waste from the textile industry is considered as a potential source of environmental pollution, especially water because it contains dangerous dyes. In this research, natural zeolite is used as an effective and efficient alternative adsorbent to overcome pollution caused by methylene blue and methyl orange dyes. Activation of natural zeolite was carried out with 3 M HCl solution and was characterized using X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). While the methylene blue and methyl orange adsorption processes were studied in variations in the weight of the adsorbent, contact time, and pH. The concentration of dyes left in the solution was observed with Spectrophotometer UV-Vis. The results showed that the adsorption capacity of natural zeolite in absorbing methylene blue was 21.189 mg/g and and methyl orange was 18.208 mg/g. The optimum conditions of methylene blue and methyl orange adsorption are achieved with successive adsorbent weights 0.3 g and 0,4 g, successive contact times are 60 minutes and 90 minutes, and successive pH are 6 and 2 respectively. The adsorbent weight factor, contact time, and pH have an effect on the adsorption of methylene blue and methyl orange by natural zeolite from Ende.
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49

Huo, Xiao Ping, Fang Wang, Deng Deng, and Lei Wang. "Adsorption of Methylene Blue on Starch Microsphere from Aqueous Solutions." Advanced Materials Research 557-559 (July 2012): 1109–12. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.1109.

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In order to resolve the pollution of coloured wastewater, starch microsphere was used to absorb methylene blue from aqueous solutions in this paper. Starch microsphere is artificial starch derivative, can be synthesized by cross-linking reaction from crude starch and modified starch. The cross-linked starch microsphere was prepared from soluble starch and N, N'-methylenebisacrylamide, and starch microsphere has characteres of irregular appearance, uniform size, suitable swelling, three-dimensional network structure, suitable shell pore diameter and specific surface area, good mechanical intensity. The microporous structure of starch microsphere was determined using Scanning Electronic Microscopy (SEM). The adsorption capacity of starch microsphere to methylene blue was studied. It could be shown that the adsorption capacity increases with the increase of concentration of methylene blue. Also, the lower the temperature was, the bigger the adsorption capacity of SM was in the same concentration. So, starch microsphere could effectively absorb methylene blue from aqueous solutions and thus the influencing factors of the adsorption were discussed in detail.
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50

Khuluk, Rifki Husnul, Ali Rahmat, Buhani Buhani, and Suharso Suharso. "Removal of Methylene Blue by Adsorption onto Activated Carbon From Coconut Shell (Cocous Nucifera L.)." Indonesian Journal of Science and Technology 4, no. 2 (July 9, 2019): 229–40. http://dx.doi.org/10.17509/ijost.v4i2.18179.

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This research has been conducted on process of production activated carbon from coconut shells, which are activated both physics and chemistry to improve the adsorption of methylene blue. The process of physical activation was done by burning the coconut shell using a furnace at a temperature of 700°C. The chemical activation was done using H3PO4 activator. The result of activated carbon physical activation (CAP) has a greater absorbency than activated carbon chemical activation (CAC) with each of the absorption of methylene blue at 99.42 and 98.64%. Analysis of surface morphology on the adsorbent was performed using a Scanning Electron Microscope (SEM). SEM results indicated that (CAP) has a surface morphology that is relatively similar to commercial activated carbon (CACm). Adsorption test was conducted on the determination of the optimum pH, adsorption rate, and isotherm adsorption of methylene blue. The results of the optimum pH on CAC, CAP, and CACm respectively obtained at pH 8 and the optimum contact time is obtained respectively at 40, 60, and 80 minutes. Adsorption kinetics data of methylene blue on CACm, CAP, and CAC tend to follow the pseudo second order kinetics with a correlation coefficient (R2) is 0.937; 0.950; and 0.999, respectively. Adsorption isotherm of methylene blue on CACm, CAP, and CAC tend to follow the model of Freundlich isotherms.
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