Journal articles: 'Absorption/adsorption'

1

Kern, Raymond. "Adsorption, absorption, versus crystal growth." Crystal Research and Technology 48, no. 10 (August 13, 2013): 727–82. http://dx.doi.org/10.1002/crat.201200704.

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Tvardovskii, A. V. "A common approach to adsorption and absorption: Polymolecular adsorption." Bulletin of the Russian Academy of Sciences Division of Chemical Science 41, no. 4 (April 1992): 603–7. http://dx.doi.org/10.1007/bf01150877.

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Smith, Gregory N., Isabelle Grillo, Sarah E. Rogers, and Julian Eastoe. "Surfactants with colloids: Adsorption or absorption?" Journal of Colloid and Interface Science 449 (July 2015): 205–14. http://dx.doi.org/10.1016/j.jcis.2014.12.048.

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Tvardovskii, A. V. "General approach to adsorption and absorption." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 40, no. 7 (July 1991): 1307–11. http://dx.doi.org/10.1007/bf00961220.

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Yang, Hui Yong, and Qing Song Li. "Adsorption Characters of 17α-Ethynyestradiol by Activated Carbon." Advanced Materials Research 468-471 (February 2012): 767–70. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.767.

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This paper studied the activated charcoal absorption EE2 characters by static absorption method. The result showed that EE2 can be removed effectively by activated carbon adsorption. Langmuir isothermal equation can describe the adsorption EE2 characters of activated charcoal well. The relativity adsorption coefficient reached marked or extremely marked level; compared with adsorption performances of different kinds of activated carbon coefficient, the adsorption capacity of PAC3# was the largest to EE2, The adsorption rate of PAC7# was the fastest, but the adsorption capacity of PAC7# was the smaller.

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Smittenberg, J. "Absorption and adsorption of hydrogen by Nickel." Recueil des Travaux Chimiques des Pays-Bas 53, no. 12 (September 3, 2010): 1065–83. http://dx.doi.org/10.1002/recl.19340531202.

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Jia, Na, and Chang Liu. "Research on Physical and Mechanical Performance and Formaldehyde Adsorption Characteristics of Self-Adsorption Fiber Board." Advanced Materials Research 113-116 (June 2010): 547–51. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.547.

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The composite element method（CEM） is utilized to mix wood fiber and activated carbon into the self-adsorption fiber board under certain process condition. The density, bending strength, elastic modulus, internal bond strength and water absorption are tested under the same condition, at the same time, the formaldehyde emission rate is measured with desiccator method. The result shows that all the mechanical properties of self-adsorption fiber board are a bit higher than that of ordinary fiber board. The effect of formaldehyde self-absorption is highly related to the amount of added activated carbon instead of the form. Under the test condition, the emission of formaldehyde of the self-adsorption fiber board added with 10% activated carbon grain can be reduced by 35%. Further more, it is easier for the self-adsorption fiber board added with powder activated carbon to obtain even physical and mechanical performance and absorption effect.

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Liu, Chang, Shuai Shuai, Shuai Cao, Pengyu Wang, and Jiabin Cai. "Hygroscopic properties of six tree species with four tangential thicknesses." BioResources 17, no. 2 (April 6, 2022): 2959–76. http://dx.doi.org/10.15376/biores.17.2.2959-2976.

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The differences of hygroscopic property among six tree species with four thicknesses were examined. The density, chemical composition, crystallinity, equilibrium moisture content (EMC), and moisture absorption rate were measured by static saturated salt solution method, and the isothermal moisture absorption curve was fitted by the H-H model to analyze monolayer molecular adsorption and multilayer molecular adsorption. The results show that under the same relative humidity (RH), the EMC of Picea asperata and Populus deltoides were increased with increasing thickness, while that of Quercus spp. and Xanthostemon melanoxylon were decreased. The moisture absorption rate of P. asperata was the largest and that of X. melanoxylon was the smallest. When RH ranged from 0 to 97%, the monolayer molecular adsorption water amount of samples with different thicknesses of the six tree species gradually became close. With the increase of tree species density, the monolayer molecular adsorption water amount of the thinner sample is gradually greater than that of the thicker sample. The change of multi-layer molecular adsorption water content is consistent with that of EMC, Moisture absorption rate, monolayer molecular adsorption water, and multilayer molecular adsorption water are related to the chemical composition content, density, and thickness of tree species.

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9

Zuo, Ke Sheng, Jian Chao Liu, and Peng Shang. "Study on Cu²⁺ Absorption Characteristics of Bentonite - Acrylic Acid Resin." Advanced Materials Research 581-582 (October 2012): 685–88. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.685.

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Bentonite has better heavy metallic ion adsorption capacity than most of other minerals. But bentonite suspension is stalbe and it makes the solid-liquid separation very difficult. To solve this problem, bentonite was fixed into the resin by copolymerizing with acrylic acid. The reaction mechanism and the effect of bentonite on the properties of the resin were studied. The results show that the addition of bentonite has similar effect on the water-absorption and Cu2+ adsorption properties of the resin. When the mass ratio of bentonite to acrylic acid is below 1∶2, the addition of bentonite improve the water absorption and Cu2+ adsorption properties, and the water absorption and Cu2+ adsorption properties decline with more bentonite added.

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Rahayu, Ulfi. "Kinetika Adsorpsi Zat Warna Direct Brown Menggunakan Hidroksiapatit Dengan Variasi Dosis Adsorben dan pH Larutan." Jurnal Ilmiah Teknik Kimia 5, no. 1 (January 25, 2021): 8. http://dx.doi.org/10.32493/jitk.v5i1.7390.

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Adsorption is a dye absorption process using various adsorbents. Dye waste produced by industry can pollute the environment because it is dangerous and poisonous. In this study, calcium-deficient hydroxyapatite with a Ca / P ratio of more / less than 1.67 was used as the adsorption medium. Utilization of the adsorption process in dye absorption is useful for determining isotherm models and adsorption kinetics. The dye used is direct brown. The dye adsorption process was carried out at variations in pH (6, 7, 8) and adsorbent mass (0.1; 0.15; 0.2 wt%) at a rotating speed of 250 rpm and 30 ppm of dye concentration. The maximum adsorption capacity occurs at pH 6 with an absorption efficiency of 51.4%. The equilibrium model tested is the Langmuir, Freundlich, Harkins Jura, Temkin equilibrium model. and Dubinin-Raduskevich. The isotherm model of the direct brown dye adsorption process follows the Temkin model with a R2 value of 0.9996. The adsorption kinetics tested were Pseudo First Order, Pseudo Second Order, Elovich and Intraparticle Diffusion. The kinetics of the direct brown dye adsorption process followed the intraparticle diffusion order kinetics model with R2 value of 0.9938 in the adsorption process with a pH of 6 and an adsorbent mass of 0.5 grams.

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Sylvia, Novi, Lia Sobrina, and Nasrun Nasrun. "Optimasi Proses Penyerapan CO2 dengan Adsorben Karbon Aktif Menggunakan Computational Fluid Dynamics (CFD) dan Response Surface Methodology (RSM)." Jurnal Teknologi Kimia Unimal 8, no. 1 (October 11, 2019): 69. http://dx.doi.org/10.29103/jtku.v8i1.1918.

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Biogas purification from carbon dioxide compounds due to can reduce the calorific value of methane (CH4). One application used in this case is adsorption using activated carbon. This study aims to simulate the absorption of CO2 using ANSYS R19.0 and to analyze percent adsorption, adsorption capacity and isothermal adsorption. Based on variations in bed height, flow rate and pressure, the highest percent percussion occurs at 10 cm bed height, 50 cm3/minute flow rate with a pressure of 1.4 atm and the lowest percent absorption occurs at 6 cm bed height, 150 cm3/minute flow rate with a pressure of 1.2 atm. Whereas the maximum absorption capacity occurs at 8 cm bed height, 50 cm3/minute flow rate at a pressure of 1.4 atm and minimum absorption capacity occurs at 8 cm bed height, flow rate of 150 cm3/minute at a pressure of 1 atm. This adsorption process occurs in the Langmuir isotherm with R2 approaching 1, which is equal to 0.9151. The optimization results were obtained at a flow rate of 50 cm3/minute, bed height 9.46 cm and 1.4 atm pressure.

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Mohamad, Erni, Intan J. Oputu, and Julhim S. Tangio. "Pemanfaatan Gulma Siam (Chromolaena odarata L.) Sebagai Adsorben Logam Timbal." Jambura Journal of Chemistry 2, no. 1 (July 7, 2020): 27–34. http://dx.doi.org/10.34312/jambchem.v2i1.4528.

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This study aims to utilize (Chromolaena odorata L) as a metal adsorbent. The methods used to make activated charcoal are dehydration, carbonization, and activation. The activated carbon is then characterized to obtain activated charcoal that can be applied, then optimized. The results of activated carbon characterization obtained have reached the activated carbon quality requirements based on the Indonesian Industry Standard (SII No. 0258-88). Based on the adsorption test, the optimum pH of Pb2+ (Pb (NO3) 2 (in distilled water) Chromolaena odorata L charcoal activated by NaOH 0.2 M under varying pH (2,3,4,5,6) is at pH 5 with 69.00% absorption. The optimum contact time required for Pb ion adsorption is 4 hours at variation (1-5 hours) with 70.19% absorption. The optimum concentration at variation (concentration 20; 40; 60; 80; 100 ppm) on Pb ion adsorption is 100 ppm with 76.15% absorption. The optimum heating time is a variation of 1.5; 2; 2.5; and 3 hours of Pb ion adsorption is one hour 30 minutes with an absorption of 65.95%. Based on the optimization results, the activated carbon from the Chromolaena odorata L can be used as an adsorption material against the contamination of lead heavy metals (Pb).

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Pan, Qing Shan, Wei Liu, Mei Gui Ma, He Ping Yan, Bo Zhou, Du Shu Huang, Bao Sen Wang, Na Wu, Ling Shi, and Shi Juan Xu. "Preparation of Modified Corncobs by Citric Acid and Study on the Adsorption of Cr (VI)." Advanced Materials Research 726-731 (August 2013): 2260–63. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.2260.

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The modified corncobs was prepared by using citric acid. Conditions of preparation, the effects of pH, initial concentrations of Cr (VI) and adsorption time to adsorption of Cr (VI) was studied. Results show that when citric acid concentration at 3molL-1, heating treatment temperature at 160°C, the treatment time at 2h, the modified corncobs had a high adsorption of Cr (VI). At room temperature, Cr (VI) initial concentration at 10 mgL-1, medium aqueous solution pH at 2.5, adsorption time at 150min, the absorption rate of modified corncobs for Cr (VI) was 96.13%, higher than absorption rate of ordinary corncobs for 22.83%.

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14

Xu, Hui, Dong Hong Guo, and Yao Xu. "Removal of Cu(II) Ions from Aqueous Solution by KH-570 Modified Attapulgite Clay." Advanced Materials Research 320 (August 2011): 275–79. http://dx.doi.org/10.4028/www.scientific.net/amr.320.275.

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Attapulgite clay (ATP) was modified by Silane coupling agent (KH-570) to creat more efficient sites for Cu(II) adsorption. The natural and KH-570 modified attapulgite clay were characterized by Fourier transform infrared spectrometer (FTIR) and SEM. The effects of various experimental parameters such as the amount of modifier, the quality of KH-570 modified ATP, adsorption time, adsorption temperature on Cu(II) adsorption onto KH-570modified ATP were studied in detail. The results showed that the 30% of modifier (The quality of the modifier mass fraction attapulgite) had the best adsorption capacity. When the dosage of modified attaplgite clay was 0.5g and the absorption time was 240min under 20°C, the adsorption rate of Cu(II) in wastewater approached 97%. Meanwhile, the type of absorption was Langmuir isotherm. Desorption experiments showed that the adsorption mechanism of KH-570 modified ATP to Cu(II) was the chemical adsorption.

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15

Wang, Gui Ping, Gui Yan Wang, and Chun Yan Cao. "Adsorption Characteristics of Directly Modified Bentonite." Advanced Materials Research 826 (November 2013): 263–66. http://dx.doi.org/10.4028/www.scientific.net/amr.826.263.

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Directly modified bentonite was obtained by directly adding modifier cetyl trimethyl ammonium bromide (CTMAB) to sodium bentonite.The modified bentonites adsorption performance to methyl orange and methylene blue was studied, and it was compared with modified bentonite prepared by classical method. The results show that directly modified bentonite has a greater and faster absorption for both methyl orange and methylene blue; the relationship between adsorption quantity and equilibrium concentration conforms to the Langmuir isotherm equation; absorption kinetics is in accordance with the secondary dynamics equation.

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16

Al-Faqeer, F. M., K. G. Weil, and H. W. Pickering. "Analysis of Hydrogen Absorption under Competitive Adsorption Conditions." Journal of The Electrochemical Society 150, no. 5 (2003): B211. http://dx.doi.org/10.1149/1.1562594.

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17

Duncan, Hugues, and Andrzej Lasia. "Hydrogen adsorption/absorption on Pd/Pt(111) multilayers." Journal of Electroanalytical Chemistry 621, no. 1 (September 2008): 62–68. http://dx.doi.org/10.1016/j.jelechem.2008.04.019.

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18

Yu, Li Li, and Lin Yao. "Adsorption of Cu (II) on Thiourea Impregnated Gelatin Microspheres." Advanced Materials Research 634-638 (January 2013): 187–91. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.187.

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In this study, we describe a novel adsorbent, thiourea impregnated gelatin microspheres(TIGM) which were synthesized from thiourea impregnated gelatin by inverse suspension polymerization with glutaraldehyde as crosslinker. With the aim to investigate the absorption kinetics of Cu(II) on TIGM, the absorption equilibrium, the effects of temperature on the absorption was fully discussed. It was found that this adsorbent is effective for the removal of Cu(II) from aqueous solutions. Results of the experiments presented that the thiourea was uniformly dispersed in microspheres mainly through chemical bonds, and the adsorption isotherms of Cu(II) on TIGM fits well both with the classical Freundlich equation and the Langmuir equation. It was also suggested that the adsorption rate of Cu (II) was faster at higher temperature, and the amount of the adsorption also increases with the increasing of temperature. According to the research, the maximal adsorption capacity is obtained when pH is 5 to 9, and the adsorption kinetics of Cu(II) onto TIGM could be described by pseudo-first-order rate mode.

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Choi, Sung-kyu, Min-jun Kim, Tae-geon Kim, and Tae-jin Lee. "Removal of Heavy Metals (Fe, Mn and Cd) from Aqueous Solutions by Natural Zeolite and FeS Media." Journal of Korean Society of Environmental Engineers 43, no. 7 (July 31, 2021): 524–36. http://dx.doi.org/10.4491/ksee.2021.43.7.524.

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Objectives : The adsorption characteristics of Fe, Cd, and Mn in aqueous solution using zeolite and FeS media were investigated by the adsorption isotherm and kinetic model analysis.Methods : The adsorption characteristics of the heavy metals (Fe, Mn, Cd) were investigated using Langmuir or Freundlich adsorption isotherm. The analysis of pseudo-first or pseudo-second order reaction was also attempted to evaluate the rate limiting factor such as molecular diffusion or chemical adsorption on the absorbents.Results and discussion : The adsorption of the heavy metals on the zeolite and FeS media was more suitable for the Langmuir adsorption isotherm, representing that mono-layer absorption on the surface and no interaction between the absorbed solutes. The order of adsorption preference to zeolite was Fe > Cd > Mn, whereas the order of adsorption preference to FeS media was Cd > Fe > Mn. The adsorption kinetics of zeolite and FeS media were more suitable for pseudo-secondary reactions than for pseudo-primary reaction.Conclusions : The absorption capacity of FeS media for the heavy metals (Fe, Cd and Mn) in aqueous solution was higher than that of zeolite. The adsorption pattern was suitable for the Langmuir adsorption isotherm, and has kinetic characteristic by chemisorption.

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Kuczyńska, Agnieszka, and Władysław Szaflik. "Absorption and adsorption chillers applied to air conditioning systems." Archives of Thermodynamics 31, no. 2 (July 1, 2010): 77–94. http://dx.doi.org/10.2478/v10173-010-0010-0.

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Absorption and adsorption chillers applied to air conditioning systemsThis work presents an application possibility of sorption refrigerators driven by low temperature fluid for air conditioning of buildings. Thermodynamic models were formulated and absorption LiBr-water chiller with 10 kW cooling power as well as adsorption chiller with silica gel bed were investigated. Both of them are using water for desorption process with temperatureTdes= 80 °C. Coefficient of performance (COP) for both cooling cycles was analyzed in the same conditions of the driving heat source, cooling waterTc= 25 °C and temperature in evaporatorTevap= 5 °C. In this study, the computer software EES was used to investigate the performance of absorption heat pump system and its behaviour in configuration with geothermal heat source.

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Febriani, Helni, Dwi Juli Puspitasari, Ruslan, and Husain Sosidi. "Adsorbsi Ion Logam Cu (II) Menggunakan Biomassa Daun Genjer (Limnocharis flava)." KOVALEN: Jurnal Riset Kimia 7, no. 2 (September 1, 2021): 131–36. http://dx.doi.org/10.22487/kovalen.2021.v7.i2.14009.

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The adsorption of Cu (II) ions by Genjer (Limnocharis flava) biomass has been carried out. This research aims to determine the optimum pH of the plant and the contact time between the metal ion Cu (II) with the plant that produces the highest absorption, as well as knowing the best adsorbent mass for absorption between Cu (II) metal ions and genjer plants. The study used a completely randomized design (CRD) with variables of pH, contact time, and adsorbent mass. The testing of the absorption of the Genjer leaves biomass against Cu (II) was carried out with Atomic Adsorption Spectrophotometric (AAS). The results showed that the optimum absorption produced was 83.34% at pH 4, and 91.54% with the highest contact time of 30 minutes, and 82.04% with an adsorbent mass of 1 gram. Keywords: Limnocharis flava, pH, contact time, adsorbent mass, adsorption, Cu (II) ion

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Zhang, Junxia, Zehua Wang, Binwu Wang, and Xiaopeng Song. "Investigation on nanographene generation and its molecule adsorption." Materials Express 9, no. 7 (October 1, 2019): 813–20. http://dx.doi.org/10.1166/mex.2019.1565.

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An experimental method was applied to prepare nanographene, in which its surface feature was analyzed using scanning electron microscope and Fourier infrared ray analyzer. A methylene blue (MB) solution was adopted to measure the molecule adsorption of nanographene and graphite and demonstrated that nanographene had more molecule adsorption than that by graphite. As the concentration of MB solution increased, the molecule adsorption of nanographene ascended. As the stirring time of a magnetic stirrer decreased, the molecule adsorption of nanographene in the MB solution increased significantly. Meanwhile, the increment in the absorption amount of graphite reduced. As the dosage of nanographene and graphite increased, the absorption capacity of nanographene reached a peak value of 40 mg, which was two- or threefold higher than that of graphite. Hence, nanographene has higher molecule adsorption capacity than graphite.

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23

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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Tang, Xiao. "Improvement of the Performance of Dye-Sensitized Solar Cells with TiO₂ Photoanodes in Unsaturated." Applied Mechanics and Materials 448-453 (October 2013): 2979–85. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2979.

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The photoelectrochemical properties of the TiO2 photoanode in unsaturated dye-adsorption state for dye-sensitized solar cells (DSCs) were investigated by the electrochemical impedance spectroscopy (EIS) and the light absorption spectrum. Significant low charge recombination as well as light absorption saturation was observed with the TiO2 photoanode in unsaturated dye-adsorption state. Due to these effects, from saturated to unsaturated dye-adsorption state, the fill factor (ff) increased from 0.60 to 0.78 and the open circuit photovoltage (Voc) increased from 770mV to 780mV. The short circuit photocurrency density (Isc) reached the maximum 10.51mA cm-2 before the TiO2 photoanode attained the saturated dye-adsorption state. The energy conversion efficiency (η) of DSC was enhanced from 4.86% to 5.34% by adjusting the TiO2 photoanode from saturated to unsaturated dye-adsorption state.

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Cendekia, Děvy, Dian Ayu Afifah, and Windia Hanifah. "Linearity Graph in the Prediction of Granular Active Carbon (GAC) Adsorption Ability." IOP Conference Series: Earth and Environmental Science 1012, no. 1 (April 1, 2022): 012079. http://dx.doi.org/10.1088/1755-1315/1012/1/012079.

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Abstract Detergent waste or greywater is the waste generated from most cleaning products. The existing cleaning products generally contain compounds that threaten the life of aquatic biota, so special treatment is needed in the disposal of their waste. Several studies have stated that activated carbon is a good medium for the adsorption of detergent waste. This research aims to find out maximum ability of activated carbon as a waste adsorption medium detergent. So that the necessary initial analysis of the quality of activated carbon for maximizing the performance of activated carbon as an adsorption medium detergent waste. Iodine absorption analysis can be used as an initial reference in determining the quality of adsorption media. Iodine absorption linearity test using concentrations of 0.025 N, 0.05 N, 0.1 N, 0.15 N, 0.2 N carried out on granular activated carbon which will be used as an adsorption medium. Based on the graphic linearity determination coefficient values obtained at 0, 99. In other words, the absorption of GAC is influenced by iodine concentration, with the correlation between the two variables being opposite. Increasing the concentration of iodine will be accompanied by a decrease in the absorption of iodine. This shows that using GAC as an adsorption medium, it is necessary to take into account the pollutant content of the detergent waste and the contact time of GAC to the pollutant (adsorbate). To be effective as an adsorption medium, the calculation of pollutant levels of detergent waste needs to be analyzed as an initial reference in determining the required contact time. Estimated contact time will affect the design of the adsorbent media for activated carbon-based detergent waste.

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Fan, Zhen Zhong, Zhe Ming Zhang, Xian Tao Zeng, Qing Wang Liu, Ji Gang Wang, Rui Gao, and Ling Da Kong. "Laboratory Study on the Static Absorption of Cationic Gemini Surfactant CGS on Quartz Sand." Applied Mechanics and Materials 295-298 (February 2013): 1414–18. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.1414.

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Adsorption isotherms of new type cationic Gemini surfactant named CGS on quartz sand has been got by using solution concentration difference method. The effect of different factors on adsorption, such as temperature, pH value and salinity, are studied too. The adsorption isotherm of CGS on quartz sand accorded with Langmuir shape. The adsorption quantity increased with the increasing of surfactant concentration at an adagio rate, then the adsorption quantity increased fast, and it reached adsorption saturation when mass concentration was 150 mg/L, and saturated absorption was 6.3 mg/g. The adsorption quantity of CGS increased with the increasing of salt concentration. When heighten temperature and pH value, the adsorption quantity of CGS decreased.

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Xu, Hui, Yao Xu, and Yong Chen. "Absorption of Eriochrome Blue Black on Polyaniline/Attapulgite Nanocomposites." Advanced Materials Research 194-196 (February 2011): 488–91. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.488.

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Polyaniline/attapulgite (PANI/ATP) nanocomposites doped by hydrochloric acid (HCl) were prepared by in-situ polymerization method. The structure and absorption mechanism for eriochrome blue black of nanocomposite were investigated. Amount of absorbent and influence of pH for absorbent effect were also studied. The results reveal that the nanocomposites have not only the structure of ATP but also the property of the PANI. The nanocomposites hold an excellent adsorption for eriochrome blue black when the pH value is 5. The adsorption thermodynamics of the nanocomposites follows the Langmuir isothermal adsorption equation. The maximum adsorption capacity can reach 192.67mg/g. The calculate results show that the adsorption enthalpy is 4.15kJ/mol, the Gibbs free energy is (–22.98 to –19.26) kJ/mol, and the entropy of 81J/(mol·K), which imply that the adsorption is an endothermal and spontaneous process.

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Dong, E., and Long Guan. "The Microstructure and Adsorption Property of Improved Coal Gangue." Advanced Materials Research 382 (November 2011): 427–30. http://dx.doi.org/10.4028/www.scientific.net/amr.382.427.

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Since coal gangue can destroy the environment, we aim at improving coal gangue to absorbing material by changing it in different temperature and chemical liquor. Base on the microstructure and the adsorption experiment, we detect microstructure and absorption property of improved coal gangue. The microstructure experiment shows that the average pore size and specific surface area of improved coal gangue appear distinguish obviously as the increasing of chemical liquor pH value and temperature. Absorption experiment shows that the absorption capacity of improved coal gangue decrease as the chemical liquor pH value increase, increase as the temperature increase. The adsorption capacity of improved coal gangue increases with an increase of average pore size and specific surface area.

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Wang, Li Jun, Xin Liang Liu, Hong Xiang Zhu, Meng Ling Weng, Zhou Jun Li, Yi Guan Lu, Fu Sheng Wu, and Shuang Fei Wang. "Study on the Effect of Carboxyl Bagasse Hemicellulose on Heavy Metal Adsorption." Advanced Materials Research 415-417 (December 2011): 1630–36. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.1630.

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In this paper, ions i.e. Cu2+, Pb2+and Cd2+ were absorbed by the carboxyl bagasse hemicelluloses, and the influences of pH value, adsorption time and the initial concentration of metal ion have been studied. The results show that the optimal adsorption pH values for Cu2+, Pb2+and Cd2+ are 5.5, 5.5 and 7.5, respectively. The adsorption capacity to ions Cu2+, Pb2+and Cd2+ reaches the maximum values when the adsorption time is 180 min. Net adsorption to ions Cu2+, Pb2+and Cd2+ increases with increasing the initial concentration of the metal ions. Analysis results of adsorption dynamics show that the adsorption of Cu2+, Pb2+and Cd2+ follows Ho 's Pseudo second-order kinetics linear model. It can be seen from the adsorption isothermal research that absorption of the carboxyl bagasse hemicelluloses to ions Cu2+, Pb2+and Cd2+ can be well described by the Langmuir isotherm linear model. Moreover, the theoretical values of the maximum absorption capacity qmax for ions Cu2+, Pb2+and Cd2+ were determined to be 20.28 mg/g, 82.64 mg/g and 30.58 mg/g, respectively.

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Wang, Li Jun, Xin Liang Liu, Meng Ling Weng, Shuang Xi Li, Fu Sheng Wu, Zhou Jun Li, and Shuang Fei Wang. "Study on the Effect of Amphoteric Bagasse Hemicellulose on Heavy Metal Adsorption." Advanced Materials Research 399-401 (November 2011): 1282–88. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.1282.

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In this paper, ions i.e. Cu2+, Pb2+and Cd2+ were absorbed by the amphoteric bagasse hemicelluloses, and the influences of pH value, adsorption time and the initial concentration of metal ion have been studied. The results show that the optimal adsorption pH values for Cu2+, Pb2+ and Cd2+ are 6.5, 6.0 and 7.5, respectively. The adsorption capacity to ions Cu2+, Pb2+ and Cd2+ reaches the maximum values when the adsorption time is 180 min. Net adsorption to ions Cu2+, Pb2+ and Cd2+ increases with increasing the initial concentration of the metal ions. Analysis results of adsorption dynamics show that the adsorption of Cu2+, Pb2+ and Cd2+ follows Ho 's Pseudo second-order kinetics linear model. It can be seen from the adsorption isothermal research that absorption of the amphoteric bagasse hemicelluloses to ions Cu2+, Pb2+and Cd2+ can be well described by the Langmuir isotherm linear model. Moreover, the theoretical values of the maximum absorption capacity qmax for ions Cu2+, Pb2+ and Cd2+ were determined to be 21.98 mg/g, 81.97 mg/g and 31.85 mg/g, respectively.

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Michael Jacob Ioelovich. "Study of sorption of alcohols vapors by cellulose." World Journal of Advanced Research and Reviews 14, no. 1 (April 30, 2022): 043–50. http://dx.doi.org/10.30574/wjarr.2022.14.1.0286.

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In this article, the sorption of vapors of various alcohols by cellulose samples has been studied. Isotherms of vapors sorption of all studied alcohols have a sigmoid shape combining multilayer surface adsorption and absorption with capillary condensation at the final stage. To separate sorption from capillary condensation, the thermodynamic equation was used describing only the sorption process. It was found that sorption of methanol vapor was performed via absorption of alcohol molecules by accessible clusters of amorphous domains of cellulose. In contrast to methanol, the sorption of vapors of higher alcohols such as propanol and butanol by cellulose is carried out by the mechanism of multilayer surface adsorption. Sorption of ethanol vaper by cellulose combined multilayer surface adsorption and very limited absorption by accessible clusters of amorphous domains of cellulose.

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32

Li, Qiang, Sheng Han, Yuan Xiu Wang, Chun Jiang Ye, Feng Shan Wang, Qing Sheng Qi, and Hao Ran Cui. "Research on the Cr (VI) Absorption by Floc-Type Biosorbent AR." Advanced Materials Research 383-390 (November 2011): 3029–34. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3029.

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Biosorptions of Cr (VI) by the floc-type biosorbent AR (with glycocalyx) and AR (without glycocalyx) were compared. The initial pH was important for biosorption, and the optimum effect on Cr (VI) biosorption was acquired within initial pH 0.5-1.0. With the pH increasing, the effect on Cr(VI) biosorption was reduced, and when the initial pH exceeded 3.0, the effect on Cr (VI) biosorption was in an equilibrium of low levels. Biosorbing Cr (VI) of different concentrations, the maximal absorbing capacity of AR (with glycocalyx) and AR (without glycocalyx) was 187.36 mg•g-1, 56.1 mg•g-1 respectively, and the glycocalyx adhering on the cell improved the absorption obviously. The absorbed Cr (VI) could be recovered by desorption, and the desorption rate of AR (with glycocalyx) and AR (without glycocalyx) reached 67.9%and 62.3% separately. The two biosorption processes conformed Langmuir and Freundlich isotherm adsorption equations, so we could presume that the progress of biosorptions was reversible adsorption and irreversible adsorption simultaneously, however the reversible adsorption was more important in the biosorption and the adsorption belonged to physical adsorption. Besides Agrobacterium sp. fermentation broth could be used as bioflocculant, Agrobacterium sp. could be applied as biosorbent, and the glycocalyx improved the absorption obviously, then both the bioflocculant and biosorbent were promising biological products

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Gao, Shaomin, Wenwen Zhang, Zhaohui An, Shulin Kong, and Donghui Chen. "Adsorption of anionic dye onto magnetic Fe3O4/CeO2 nanocomposite: Equilibrium, kinetics, and thermodynamics." Adsorption Science & Technology 37, no. 3-4 (February 4, 2019): 185–204. http://dx.doi.org/10.1177/0263617418819164.

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In this study, a magnetically separable Fe3O4/CeO2 (Fe/Ce) nanocomposite is synthesized by sol-precipitation method and characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy dispersive spectrometer , vibrating sample magnetometer, atomic absorption spectrometer, and zeta potential measurements. The Fe/Ce is used as sorbent to adsorb anionic dye of Acid Black 210 (AB210) from aqueous solutions, and the maximum adsorption capacity is about 90.50 mg/g, which is six times higher than that of the commercial CeO2. Dependence of absorption performance on essential factors, such as initial dye concentration, temperature and initial pH, are experimentally examined. The result shows that the adsorption kinetic of Fe/Ce follows pseudo-second-order model and the adsorption isotherm is well described by the Langmuir adsorption model. Furthermore, the thermodynamic analysis indicates that the adsorption of Fe/Ce for AB210 is spontaneous and endothermic.

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Ding, Chun Sheng, Fang Ming Ni, Hui Ye Cai, Qian Fen Zhu, and Ying Long Zou. "Study on the Absorption Action of Modified Activated Carbon for Phenol." Advanced Materials Research 113-116 (June 2010): 1981–85. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.1981.

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To improve the adsorption efficiency of activated carbon for phenol, copper nitrate was used to modify activated carbon. In detail, the absorption properties of modified activated carbon was studied by investigating the effects of adsorption time, pH, amount of modified activated carbon and initial concentration of phenol on the adsorption. And the dynamic and adsorbent model were obtained and explored. It shows that the removal rate of modified activated carbon for phenol was higher than the unmodified carbon, and the best removal rate can be obtained under the conditions of pH about 5, adsorption time of 2h, modified activated carbon dosage of 1.0g. The quasi-two rate equation was better to reflect the dynamics of modified activated carbon for phenol, with the initial concentration of phenol increased, equilibrium adsorption capacity and initial adsorption rate were greater. Both Freundlich and Langmuir model could reflect the adsorption behavior of modified activated carbon for phenol, while the Langmuir model was more properly.

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35

Mufida, Erika Marinda, Sri Wahyu Suciyati, Gurum Ahmad Pauzi, and Amir Supriyanto. "Kajian Simulasi Dinamika Molekul Adsorpsi Hidrogen pada Carbone Nanotube dengan Variasi Chirality dan Temperatur Menggunakan Kode LAMMPS." Journal of Energy, Material, and Instrumentation Technology 2, no. 2 (May 31, 2021): 40–50. http://dx.doi.org/10.23960/jemit.v2i2.58.

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Hydrogen adsorption has been simulated on carbon nanotubes for optimum hydrogen absorption. Parameters that affect the amount of hydrogen absorbed have been studied, such as the effect of chirality and temperature on hydrogen absorption in CNTs. The simulation method of hydrogen adsorption on carbone nanotubes uses molecular dynamics simulation code LAMMPS, applies Lennard-Jones interatomic potential and hydrogen atom movement using Van Der Waals force with Microcanonical Ensemble. Data analysis is the output of LAMPS in the form of data in XYZ format. The data contains information in the form of integration steps, number of atoms, temperature, pressure, potential energy, kinetic energy, volume, van der Waals energy, total simulation time and hydrogen absorption. The simulation results show that the optimum absorption occurs at run 10000 and a temperature of 100 K, for armchair chirality of 10 atoms, chirality of 12 atoms and zigzag chrality of 5 atoms. Formation of hydrogen coordinates with Avogadro software, formation of CNT coordinates with VMD software and visualization of hydrogen adsorption on CNTs using VMD software.

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Liu, Zhi Jang, Maeng Di Ma, Da Yong Dai, and Zhong Cai Shao. "The Production, Qualitative and Adsorbent Study of β-Cyclodextrin Molecular Engram." Applied Mechanics and Materials 713-715 (January 2015): 2958–61. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.2958.

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In the paper, the molecular engram polymer is produced by dithizone which is functional monomer,β-cyclodextrin which is pore-forming material and chloroepoxy propane which is crosslinking agent. Atomic absorption method is used to study its adsorption for lead. Thermodynamic model of adsorption and dynamic reaction order are discussed. The results show that adsorption is endoergic process and accords with Freundlich isothermal adsorption equation. Adsorption system conforms with pseudo-second order dynamic model, the static saturation adsorption amount is 45.55mg/g.

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AGRAWAL, R., M. K. MISHRA, K. MARGANDAN, K. SINGH, R. ACHARYA, S. SHARMA, and K. QANUNGO. "FLUORIDE REMOVAL USING ACTIVATED ALUMINA: A CASE STUDY OF BHOOMA CHOTA WATER." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 21, no. 21 (December 20, 2013): 61–77. http://dx.doi.org/10.48141/sbjchem.v21.n21.2013.61_revista2013.pdf.

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The adsorption of fluoride, from a fluoride, contaminated groundwater sample from the village, Bhooma Chota, District Sikar, in the State of Rajasthan, India, has been studied using alumina grade DF-101. The fluoride adsorption capacity (q1) has been fitted into the pseudo-first-order adsorption, pseudo-second-order adsorption, Elovich, and intraparticle diffusion models. It has been found that the kinetic data fits best in the pseudo-second-order rate equation giving a very high correlation coefficient (R2 = 0.991). the modeled fluoride absorption capacity (q1) has been calculated from the various equations using the constants derived from the least square regression plots. The calculated q1 values, model the experimental data very well, for the pseudo-second-order and Elovich equations, as is evident from the sum of square error calculations. Fluoride removal is through a combination of surface absorption and intraparticle diffusion. A study of the fluoride removal process with increasing dosage of activated alumina reveals that though the percentage of fluoride removal increases with activated alumina, the adsorption capacity at equilibrium decreases. The minimum dosage of activated alumina which causes the maximum percentage removal of fluoride from water, while at the same time brings forth its highest equilibrium absorption capacity has been determined.

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Yu, Cheng-Hsiu, Chih-Hung Huang, and Chung-Sung Tan. "A Review of CO2 Capture by Absorption and Adsorption." Aerosol and Air Quality Research 12, no. 5 (2012): 745–69. http://dx.doi.org/10.4209/aaqr.2012.05.0132.

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39

Arocha, Marco A., Ben J. McCoy, and Alan P. Jackman. "VOC immobilization in soil by adsorption, absorption and encapsulation." Journal of Hazardous Materials 51, no. 1-3 (November 1996): 131–49. http://dx.doi.org/10.1016/s0304-3894(96)01824-9.

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NOBUHARA, Kunihiro, Hiroshi NAKANISHI, Hideaki KASAI, and Ayao OKIJI. "Hydrogen Atom Adsorption on and Absorption in Metal Surfaces." SHINKU 44, no. 3 (2001): 280–83. http://dx.doi.org/10.3131/jvsj.44.280.

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41

Gaur, Ankur, Jin-Won Park, Sanjeev Maken, Ho-Jun Song, and Jong-Jin Park. "Landfill gas (LFG) processing via adsorption and alkanolamine absorption." Fuel Processing Technology 91, no. 6 (June 2010): 635–40. http://dx.doi.org/10.1016/j.fuproc.2010.01.010.

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42

Gabrielli, C., P. P. Grand, A. Lasia, and H. Perrot. "Investigation of Hydrogen Adsorption-Absorption into Thin Palladium Films." Journal of The Electrochemical Society 151, no. 11 (2004): A1925. http://dx.doi.org/10.1149/1.1797033.

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43

Aquilano, Dino, and Linda Pastero. "Anomalous mixed crystals: a peculiar case of adsorption/absorption." Crystal Research and Technology 48, no. 10 (August 7, 2013): 819–39. http://dx.doi.org/10.1002/crat.201200708.

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44

Sjödin, Torgny, Christina Diogo Löfgren, Per Olof Glantz, and Cecilia Christersson. "Delmopinol – adsorption to and absorption through the oral mucosa." Acta Odontologica Scandinavica 78, no. 8 (April 29, 2020): 572–79. http://dx.doi.org/10.1080/00016357.2020.1758772.

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45

Ahachad, M., A. Almers, A. Mimet, and A. Draoui. "Solar-based comparison of adsorption and absorption refrigerating machines." International Journal of Sustainable Energy 24, no. 4 (December 2005): 199–206. http://dx.doi.org/10.1080/14786450500291784.

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46

Yu, Wen-Yueh, Gregory M. Mullen, and C. Buddie Mullins. "Hydrogen Adsorption and Absorption with Pd–Au Bimetallic Surfaces." Journal of Physical Chemistry C 117, no. 38 (September 26, 2013): 19535–43. http://dx.doi.org/10.1021/jp406736b.

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47

Amokrane, N., C. Gabrielli, E. Ostermann, and H. Perrot. "Investigation of hydrogen adsorption–absorption on iron by EIS." Electrochimica Acta 53, no. 2 (December 2007): 700–709. http://dx.doi.org/10.1016/j.electacta.2007.07.047.

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48

Novikov, A. F., and L. V. Kurbanova. "Absorption spectra of adsorption carbonyl-halide complexes of palladium." Journal of Applied Spectroscopy 53, no. 3 (September 1990): 938–41. http://dx.doi.org/10.1007/bf00665060.

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49

İsmail, Osman, and Özlem Gökçe Kocabay. "Absorption and adsorption studies of polyacrylamide/sodium alginate hydrogels." Colloid and Polymer Science 299, no. 5 (January 8, 2021): 783–96. http://dx.doi.org/10.1007/s00396-020-04796-0.

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50

Tirani, Seniman Gempur, and Sunardi Sunardi. "Study on Adsorption Kinetics of Methylene Blue by Modified Sago Frond Waste." Jurnal Sains dan Terapan Kimia 16, no. 1 (March 8, 2022): 39. http://dx.doi.org/10.20527/jstk.v16i1.12087.

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The modified sago frond waste (PSM) using the Fast Microwave-Assisted Acid method, which has several characteristic changes, was tested to determine its adsorption ability to a cationic textile dye. PSM samples as adsorbents have variations in the modification of oxalic acid addition at 0; 1,5; 3,0 and 4,5% (w/v) were used for the adsorption of Methylene Blue (MB) dye on several parameters. This study was conducted to determine the adsorption kinetics through the effect of the ratio of the adsorbent and the contact time and the acid variation of the adsorbent as additional variables. Optimum MB absorption was obtained at a ratio of 0,6 g/L and a contact time of 120 minutes. The data results were analyzed using four general kinetic models: pseudo-first-order, pseudo-second-order, intra-particle diffusion, and Elovich equation. Adsorption followed the pseudo-second-order reaction rate with a coefficient of determination (R2) 0.9996-0.9999 in all variations of PSM. The theoretical adsorption capacity was 25.58 to 27.32 mg/g, and the effect of increasing acid on PSM increased the adsorption and absorption capacity of MB. Keywords: sago frond waste, adsorption, kinetic models, methylene blue.

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Journal articles on the topic 'Absorption/adsorption'

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