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Journal articles on the topic 'Adsorption Kinetic'

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Published: 4 June 2021
Last updated: 13 June 2025

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1

Yang, Shan Shan, Zong Tang Liu, and Zheng Hao Fei. "Study on the Adsorption of O-Aminobenzoic Acid (OABA) with the Adsorption Resins Modified Chemically." Advanced Materials Research 800 (September 2013): 476–79. http://dx.doi.org/10.4028/www.scientific.net/amr.800.476.

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In this study, the resins modified with trimellitie anhydride (named ZT3) or phthalic anhydride (named ZT5) during the post-crossing of chloromethyl low crosslinking macroporous poly-styrene resin were prepared, characterized and evaluated for adsorptive removal of o-aminobenzoic acid (OABA) from aqueous solutions. The structural characterization results indicated that the resins possessed predominant micropores surface area and moderate specific surface area. The adsorption performance of OABA onto ZT3 and ZT5 was studied through static and kinetic adsorption experiment with the commercial Amberlite XAD-4 as a contrast. Langmuir and Freundlich isotherm equation could fit the adsorption isotherm of OABA onto ZT3 and ZT5 perfectly. The adsorptions of OABA onto the three resins were all spontaneous exothermic processes with physical characters. Kinetic analysis showed that the adsorption reaction could be approximated by a quasi-first kinetic adsorption equation. Key words: o-aminobenzoic acid; adsorption resin; adsorption kinetic; thermodynamic; che-mical modification
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2

Liu, Zu Lan, Lan Qian Li, Yi Ping Liu, and Ming Lu. "Kinetic Study of the Adsorption of Dye onto Cotton in SDS-CTAB Reverse Micelles." Applied Mechanics and Materials 723 (January 2015): 591–95. http://dx.doi.org/10.4028/www.scientific.net/amm.723.591.

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Adsorption kinetic study of C.I. reactive blue 19 onto cotton was carried out in SDS-CTAB reverse micelles. The data of adsorption kinetics were examined using pseudo first-and second-order kinetic models. It was found that the adsorption kinetics of dye on cotton with diffusion controlling follows the pseudo first-order kinetic model.
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3

Abbas, Ahmed Mohammed, Suha Sahib Abd, and Takialdin Abdulhadi Himdan. "Kinetic Study of Methyl Green Dye Adsorption from Aqueous Solution by Bauxite Clay at Different Temperatures." Ibn AL- Haitham Journal For Pure and Applied Science 31, no. 1 (2018): 58. http://dx.doi.org/10.30526/31.1.1853.

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Kinetic experiments were performed to induce of the green methyl dye adsorption from aqueous solution on the bauxite clay. This study includes determination of the adsorption capacity of bauxite clay to methyl green dye adsorption and study the effect of some parameters ( temperature , time ) on the kinetic of the adsorption process of the dye were studied. Quantity of dye adsorbed was increased when the temperature increases from 298 to 318K which indicates that methyl green adsorption processes are endothermic nature . In order to describe the kinetic data and the rate adsorption constants of the pseudo-first-order and second-order kinetics were used . The kinetics data were applied well with the second-order kinetic model. From activation energy value (Ea) for methyl green dye are energetically favorable and the dye adsorption includes physical and chemical adsorption types
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4

Mazumder, AZM Mainul Islam, Chowdhury Raihan Bikash, Md Ataur Rahman, and Md Mufazzal Hossain. "A Comparative Study for Adsorptive Removal of Remazol Red R and Remazol Black B from Aqueous Solution by ZnO." Dhaka University Journal of Science 66, no. 2 (2018): 121–27. http://dx.doi.org/10.3329/dujs.v66i2.54555.

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Adsorptive removal of remazol red R (RRR) and remazol black B (RBB) from aqueous solution has been investigated by using ZnO as an adsorbent. Time for adsorption equilibrium, kinetics of adsorption at different initial concentrations of dyes and adsorption isotherms at different temperatures have been studied. Adsorption capacity increased with increasing initial dye concentration. The pseudo first-order and pseudo second-order kinetics were used to describe kinetic data and the rate constants were evaluated. Experimental data fits better in the pseudo second-order kinetic model than in the pseudo first-order kinetic model for both the dyes. Langmuir and Freundlich isotherm models were applied to describe the adsorption of RRR and RBB onto ZnO powders. Langmuir isotherm model provided a better correlation for the experimental data in comparison to the Freundlich isotherm model. Adsorption of both RRR and RBB on ZnO are physical in nature and increases with decreasing temperature. The equilibrium adsorption capacity decreases from 3.43 mg/g at 200C to 2.36 mg/g at 400C for RRR whereas that in the case of RBB changes from 0.77 mg/g at 300C to 0.75 mg/g at 400C. Adsorption of RRR on ZnO was found to be three times higher than the adsorption of RBB at a particular temperature. A model for adsorption of both the dyes has been proposed.
 Dhaka Univ. J. Sci. 66(2): 121-127, 2018 (July)
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5

Bozgeyik, Kadriye, and Turkan Kopac. "Synthesis of Multi-Walled Carbon Nanotube-Zirconia Composite and Bovine Serum Albumin Adsorption Characteristics." Materials Science Forum 900 (July 2017): 27–31. http://dx.doi.org/10.4028/www.scientific.net/msf.900.27.

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Multi-walled carbon nanotube-zirconia composite (MWNT-ZrO2) was synthesized by a simple in situ chemical precipitation method. Adsorption of bovine serum albumin (BSA) from aqueous solution on the MWNT-ZrO2 composite was studied using batch technique at different pH and temperatures. The adsorption equilibrium and kinetic data were analzed using different models. The adsorption isotherm data could be described by both of the Langmuir and Freundlich adsorption models. Adsorption kinetics followed the pseudo-first-order rate model. MWNT loading improved the surface and the BSA adsorptive characteristics of zirconia.
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6

Petkovic, Sandra, Borivoj Adnadjevic, and Jelena Jovanovic. "Novel kinetics model for adsorption of pollutant from wastewaters onto zeolites. Kinetics of phenol adsorption on zeolite-type silicalite." Adsorption Science & Technology 37, no. 3-4 (2019): 349–64. http://dx.doi.org/10.1177/0263617419833201.

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The kinetics of isothermal adsorption of phenol from an aqueous solution onto the zeolite-type silicalite was investigated. Zeolite-type silicalite was synthesized and its basic physico-chemical properties were determined. Isothermal adsorption kinetics curves of phenol on zeolite-type silicalite were measured at temperature range from 283 to 313 K. By applying Friedman’s differential isoconversional method it was found that the adsorption of phenol on silicalite has one rate determining step. By using the ‘model-fitting’ method it was established that the kinetic of adsorption can be described with theoretical kinetic model of the two-dimensional phase-boundary controlled reaction (model R2). The kinetic parameters, activation energy ([Formula: see text]) and preexponetial factor ( lnA = 14.1 min−1) of phenol adsorption were calculated. The thermodynamic parameters, standard enthalpy (Δ H*), standard entropy (Δ S*) and standard free Gibbs energy of adsorption (Δ G*) were calculated and discussed. A novel model for the kinetics of pollutant adsorption from wastewaters onto zeolites based on the following: zeolite pores have cylindrical shape with average radius r0, pores in zeolite are filled simultaneously by the model ‘layer by layer’, the rate of phenol adsorption is higher than the rate of the growth of the thickness of the adsorption layer was suggested. It has been found that the adsorption kinetics can be completely described by this kinetic model.
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7

Heraldy, Eddy, Sri Juari Santosa, Triyono Triyono, and Karna Wijaya. "Anionic and Cationic Dyes Removal from Aqueous Solutions by Adsorption onto Synthetic Mg/Al Hydrotalcite-Like Compound." Indonesian Journal of Chemistry 15, no. 3 (2015): 234–41. http://dx.doi.org/10.22146/ijc.21190.

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The current investigation reports an effective adsorption of both anionic species and cationic dyes on Mg/Al hydrotalcite-like compounds (Mg/Al HTlc) synthetic from brine water, as novel, inexpensive available alternative to the commercial hydrotalcite. The feasibility of the Mg/Al HTlc, for the adsorptive removal of both anionic (Eosin Yellow-EY and Methyl Orange-MO) and cationic (Methylene blue-MB) dyes from aqueous solution was evaluated in a batch process. Dyes adsorption process was thoroughly studied from both kinetic and equilibrium points of view for all adsorbents. The adsorption kinetics was tested for the pseudo-first order and pseudo-second order kinetic models at different experimental conditions. The dyes adsorption follows the pseudo-second order kinetics model, with correlation coefficients close to unity when experimental data were fitted in the model. The experimental isotherm data were analyzed using Langmuir and Freundlich isotherms. The results from Langmuir isotherm indicated that the capacity of Mg/Al HTlc for the adsorption of anionic dyes was higher than that for cationic dyes.
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8

Yao, Hui Min, Jun Yi Zhu, and Guang Qing Xia. "The Drug Loading Kinetics Mechanism of Ion Exchange Fiber as a Novel Kind of Drug Carrier Material." Advanced Materials Research 904 (March 2014): 54–58. http://dx.doi.org/10.4028/www.scientific.net/amr.904.54.

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The adsorption of Fenazoxine hydrochloride was investigated by performing batch kinetic sorption experiments. Experiments were carried out as function of contact time, initial concentration. Adsorption data were modeled using the pseudo-first-order and pseudo-second-order kinetics equations. It showed that the pseudo-second order kinetic equation can describe the adsorption kinetics best. The results indicate that ion-exchange fiber is suitable as drug carriers for loading drugs.
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9

Joos, P. "Kinetic Equations for Transfer-Controlled Adsorption Kinetics." Journal of Colloid and Interface Science 171, no. 2 (1995): 399–405. http://dx.doi.org/10.1006/jcis.1995.1196.

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10

Li, Buqiang, G. Geeraerts, and P. Joos. "Kinetic equations for transfer-controlled adsorption kinetics." Colloids and Surfaces A: Physicochemical and Engineering Aspects 88, no. 2-3 (1994): 251–66. http://dx.doi.org/10.1016/0927-7757(94)02791-9.

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11

Savic, Jasmina, Vesna Vasic, and Borivoj Adnadjevic. "Kinetic investigation of the immobilization of chromotropic acid derivatives onto anion exchange resin." Chemical Industry 61, no. 1 (2007): 13–17. http://dx.doi.org/10.2298/hemind0701013s.

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The adsorption kinetics of pyrazol- (????) and imidazol-azo-chromo-tropic acid (IACA) onto Dowex 1-X8 resin, as a function of the dye concentration and temperature were investigated at pH 4.5. The pseudo-first- and second-order kinetic models and intraparticle diffusion model were used to describe the obtained kinetic data. The adsorption rate constants were found to be in the order of magnitude 10-2 min-1 for all of the used kinetics models. The adsorption capacity increases with increasing initial dye concentration. The study of adsorption kinetics at different temperatures (in the range from 5 to 25 ?C) reveals an increase in the rate of adsorption and adsorption capacity with increasing temperature. The activation energy (in the case of ???? 16.6 kJ/mol, and for IACA 11.3 kJ/mol) was determined using the Arrhenius dependence. Electrostatic interactions between the dye and resin beads were shown to be the adsorption mechanism.
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12

Sabadash, Vira, Oksana Mylanyk, Oksana Matsuska, and Jaroslaw Gumnitsky. "Kinetic regularities of copper ions adsorption by natural zeolite." Chemistry & Chemical Technology 11, no. 4 (2017): 459–62. http://dx.doi.org/10.23939/chcht11.04.459.

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13

Li, Bin, Hong Bin Wang, and Yan Yuan. "Adsorption Kinetics of Phosphate on Ceria-Based Adsorbent." Advanced Materials Research 726-731 (August 2013): 1668–72. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.1668.

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The adsorption kinetics and influencing factors deduction showed that adsorption process accorded with a second-order kinetic equation according to academic hypothesis. The result was validated by the phosphate adsorption onto Veria-Based adsorbent. The factor (m/V)bhad the close relation with the adsorption speed and the adsorbent dosage, intensity exponent b=0.44 (0b1) in this test condition. All the results show that phosphate adsorption on the adsorbent surface was mono-layer chemisorptions and that the hypothesis of kinetic inference was reasonable.
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14

Pang, Xiu-yan, and Fei Gong. "Study on the Adsorption Kinetics of Acid Red 3B on Expanded Graphite." E-Journal of Chemistry 5, no. 4 (2008): 802–9. http://dx.doi.org/10.1155/2008/786025.

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Expanded graphite (EG) is a kind of important adsorbent for organic compound such as oil and dyes. We have investigated the adsorption kinetics characteristics of this adsorbent for dye. EG was prepared with 50 mesh crude graphite through chemical oxidation intercalation of potassium permanganate and vitriol, and dye of acid red 3B was used as model sorbate. We have studied the adsorption kinetic models and rate-limiting step of the process. Adsorption rate and activation energy of the adsorption process were calculated. Kinetic studies show that the kinetic data are well described by the pseudo second-order kinetic model. The equilibrium adsorbance increases with the increase of the initial acid red 3B concentration. Initial adsorption rate increases with the increase of the initial dye concentration and temperature. Adsorption process of acid red 3B on EG has small activation energy. Internal diffusion appears to be the rate-limiting step for the adsorption process.
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15

Konicki, Wojciech, Małgorzata Aleksandrzak, and Ewa Mijowska. "Equilibrium and kinetics studies for the adsorption of Ni2+ and Fe3+ ions from aqueous solution by graphene oxide." Polish Journal of Chemical Technology 19, no. 3 (2017): 120–29. http://dx.doi.org/10.1515/pjct-2017-0058.

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Abstract In this study, the adsorption of Ni2+ and Fe3+ metal ions from aqueous solutions onto graphene oxide (GO) have been explored. The effects of various experimental factors such as pH of the solution, initial metal ion concentration and temperature were evaluated. The kinetic, equilibrium and thermodynamic studies were also investigated. The adsorption rate data were analyzed using the pseudo-first-order kinetic model, the pseudo-second-order kinetic model and the intraparticle diffusion model. Kinetic studies indicate that the adsorption of both ions follows the pseudo-second-order kinetics. The isotherms of adsorption data were analyzed by adsorption isotherm models such as Langmuir and Freundlich. Equilibrium data fitted well with the Langmuir model. The maximum adsorption capacities of Ni2+ and Fe3+ onto GO were 35.6 and 27.3 mg g−1, respectively. In addition, various thermodynamic parameters, such as enthalpy (ΔHO), entropy (ΔSO) and Gibbs free energy (ΔGO), were calculated.
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16

Cendrowski, Krzysztof, Karolina Opała, and Ewa Mijowska. "Carbonized Lanthanum-Based Metal-Organic Framework with Parallel Arranged Channels for Azo-Dye Adsorption." Nanomaterials 10, no. 6 (2020): 1053. http://dx.doi.org/10.3390/nano10061053.

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In this contribution, the synthesis of the metal−organic framework (MOF) based on lanthanum that exhibits trigonal prism shape is presented. The length of a single side of this structure ranges from 2 to 10 μm. The carbonized lanthanum-based organic framework (CMOF–La) maintained the original shape. However, the lanthanum oxide was reshaped in the form of rods during the carbonization. It resulted in the creation of parallel arranged channels. The unique structure of the carbonized structure motivated us to reveal its adsorption performance. Therefore, the adsorption kinetics of acid red 18 onto a carbonized metal−organic framework were conducted. Various physicochemical parameters such as initial dye concentration and pH of dye solution were investigated in an adsorption process. The adsorption was found to decrease with an increase in initial dye concentration. In addition, the increase in adsorption capacity was noticed when the solution was changed to basic. Optimal conditions were obtained at a low pH. Kinetic adsorption data were analyzed using the pseudo-first-order kinetic model, the pseudo-second-order kinetic model and the intraparticle diffusion model. The adsorption kinetics were well fitted using a pseudo-second-order kinetic model. It was found that the adsorption of anionic dye onto CMOF–La occurs by hydrophobic interactions between carbonized metal-organic framework and acid red 18.
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17

Wardani, Gatut Ari, and Winda Trisna Wulandari. "Pemanfaatan Limbah Kulit Pisang Kepok (Musa acuminate) sebagai Biosorben Ion Timbal(II)." Jurnal Kimia VALENSI 4, no. 2 (2018): 143–48. http://dx.doi.org/10.15408/jkv.v4i2.6918.

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The use of waste of kepok banana’s peel to adsorb lead(II) metal ion was done. Peel of kepok banana was activated by using nitric acid before used as adsorbent. The optimum time needed by kepok banana’s peel to adsorp lrad(II) metal was 45 minutes with adsorbed metal was 41.779%. Adsorption kinetics of lead(II) at kepok banana’s peel follows kinetic model of Ho pseudo second with the value of R2 is 0.997 and k was 0.063 minutes-1. Isothermal adsorptions from lead(II) on kepok banana’s peel follows Freundlich adsorption model with R2 was 0.893 and capacity of adsorption was 54.752 mg/gram.
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18

Adeola, Adedapo O., and Patricia B. C. Forbes. "Optimization of the sorption of selected polycyclic aromatic hydrocarbons by regenerable graphene wool." Water Science and Technology 80, no. 10 (2019): 1931–43. http://dx.doi.org/10.2166/wst.2020.011.

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Abstract A novel graphene wool (GW) material was used as adsorbent for the removal of phenanthrene (PHEN) and pyrene (PYR) from aqueous solution. Adsorption kinetics, adsorption isotherms, thermodynamics of adsorption and effect of pH, ionic strength, and temperature on the adsorption of PHEN and PYR onto GW were comprehensively investigated. Isothermal and kinetic experimental data were fitted to Langmuir, Freundlich, Temkin, Sips and Dubinin–Radushkevich models, as well as pseudo-first-order and pseudo-second-order kinetic models. The adsorption kinetic data best fit the pseudo-second-order kinetic model for PHEN and PYR sorption with R2 value >0.999, whilst the Sips model best fit isotherm data. Kinetic data revealed that 24 hr of contact between adsorbent and polycyclic aromatic hydrocarbons (PAHs) was sufficient for maximum adsorption, where the Langmuir maximum adsorption capacity of GW for PHEN and PYR was 5 and 20 mg g−1 and the optimum removal efficiency was 99.9% and 99.1%, respectively. Thermodynamic experiments revealed that adsorption processes were endothermic and spontaneous. Desorption experiments indicated that irreversible sorption occurred with a hysteresis index greater that zero for both PAHs. The high adsorption capacity and potential reusability of GW makes it a very attractive material for removal of hydrophobic organic micro-pollutants from water.
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19

Cheng, Wang Bin, Jie Ding, Xian Shu Liu, and Chun Miao Liu. "Adsorption Properties of Phenol and Aniline Removal by Poly Aluminium Chloride from the Aqueous Phase." Advanced Materials Research 955-959 (June 2014): 610–17. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.610.

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In this paper, poly aluminium chloride (PAC) was used to remove phenol and aniline from the aqueous phase .The adsorption properties of this process was investigated by zeta potential measurement, infrared spectroscopy and the analysis of pollutants structure and adsorption kinetic. The results described that not only electrostatic attraction but hydrogen adsorption were the main mechanism of both the phenol adsorption and the aniline adsorption. The pseudo second-order kinetic equation could best describe these two adsorption kinetics. The calculated activated energy of adsorption processes of phenol and aniline were 47.2KJ/mol and 44KJ/mol, respectively, which indicated that the adsorption process was chemisorption. Friedrich model was fitter to describe the adsorption isotherm of these two adsorption processes.
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20

Cruz-Tirado, JP, Arnold Cabanillas, Raúl Siche, J. Espina, Leonardo Díaz-Sánchez, and Albert Ibarz. "Bleaching of sugar cane juice using a food-grade adsorber resin and explained by a kinetic model describing the variation in time of the content of adsorbate." Food Science and Technology International 24, no. 3 (2017): 264–74. http://dx.doi.org/10.1177/1082013217747711.

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This work studies the adsorption of colored compounds in cane juice using a food-grade macroporous adsorber resin without functional groups. The adsorption equilibrium was studied through the adsorption isotherms at 30, 40, and 50 ℃. The absorbance at 420 nm was used to measure the concentration of colored compounds, which enables correlation of the residual concentration with the adsorbed concentration. Furthermore, the efficiency of the adsorption process was studied, from which it was observed that there was an improvement in efficiency with increasing resin content, while the increase in temperature was less important in the process. The kinetic study was performed using the Ibarz model and intraparticle diffusion model, which correctly account for the kinetics of the adsorption process. The adsorption kinetic constant was always greater than the desorption kinetic constant, indicating that the adsorption step predominates over the desorption step.
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21

Luo, Li Jun, Ping Bao Ban, Xue Jiao Huang, and Jun Hong Li. "Functionalized Mesporous Silica with Ethylenediamine for Removal of Pb(II)." Applied Mechanics and Materials 395-396 (September 2013): 610–14. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.610.

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Amine-functionalized mesporous silicas ((referred as NH2MS)) were synthesized by grafting with ethylenediamine. The obtained materials have been characterized by N2 adsorption desorption measurement (BET). Adsorption behaviors of the adsorbent for lead (containing effects factors, kinetics, isotherms, thermodynamics) were investigated. The result indicated that the obtained particles possessed mesoporous structrure. The Pb (II) adsorption isotherm and kinetic data fit Freundlich model and the pseudo second-order kinetic model respectively. the adsorption of Pb (II) onto NH2-MS was an enothermic nature.
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22

Ibrahim, Shariff, Megat Ahmad Kamal Megat Hanafiah, and Faisal Fadzil. "Adsorption of Lead Ions onto Citric Acid Modified Rubber (Hevea brasiliansis) Leaves." Advanced Materials Research 896 (February 2014): 288–91. http://dx.doi.org/10.4028/www.scientific.net/amr.896.288.

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The removal of Pb(II) from aqueous solutions by citric acid modified rubber leaf powder (CARL) was investigated. The higher adsorptive removal of Pb(II) from aqueous solutions by CARL compared to untreated rubber leaf powder was due to the presence of more carboxylic functional groups in the former system. Batch adsorption experiments were conducted to study the effect of pH, contact time for the removal of Pb(II) from Pb(II) aqueous systems and the mechanism of adsorption process was studied by kinetic models, pseudo-first and pseudo-second order kinetic models. The functional groups on CARL played an important role in the adsorption of Pb(II). The kinetic and equilibrium adsorption data were well modeled using pseudo-first-order kinetics. Normal 0 21 false false false MS X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif"; mso-fareast-font-family:Calibri; mso-bidi-font-family:"Times New Roman";}
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23

Abas, Siti Nur Aeisyah, Mohd Halim Shah Ismail, Shamsul Izhar Siajam, and Mohd Lias Kamal. "Comparative Study on Adsorption of Pb(II) Ions by Alginate Beads and Mangrove-Alginate Composite Beads." Advanced Materials Research 1113 (July 2015): 248–54. http://dx.doi.org/10.4028/www.scientific.net/amr.1113.248.

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The aim of the present study report on the adsorption performance of alginate bead (AB) and mangrove-alginate composite bead (MACB) bead adsorbents for the removal of Pb(II) ions from aqueous solution. The effects of pH and initial concentration with contact time on the adsorption properties of Pb(II) onto both adsorbent were investigated and were described by isotherm and kinetic studies. The isotherm adsorption data were fitted well to Freundlich isotherms for both beads and the maximum adsorption capacities of the AB and MACB beads were 29.02 mg g-1 and 10.84 mg g-1, respectively. The kinetics adsorption data were best described to a pseudo-second-order kinetic models showing that the MACB beads had a higher kinetic adsorption rate at 2.6084 g mg-1 min-1 compared to AB at 0.7043 g mg-1 min-1.
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24

Zhao, Xiao Dan, Yun Feng Gong, and Zhen Zhou. "Study on Removal of Organic Matters in Surface Water by Adsorption Resin SD500." Advanced Materials Research 610-613 (December 2012): 1383–86. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.1383.

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The research is to compare the adsorption of humic acid from aqueous solution and organic matters from natural water on several adsorption resins by static and kinetic adsorption test. The results of static adsorption show that adsorption resins 213 and SD500 have better adsorption efficacy for humic acid than D203 and 201. The results of kinetic test show that adsorption and elution effect of organics on the smaller size resins are better than the larger ones during 4 operation cycles, and the adsorptive property of SD500 is more stable than 213. It proves that SD500 with grain size less than 0.88mm can be regenerated easily and the adsorption capacity can be restored well.
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25

Thi Thanh Chau, Vo, Huynh Thi MinhThanh, Pham Dinh Du, et al. "Metal-Organic Framework-101 (MIL-101): Synthesis, Kinetics, Thermodynamics, and Equilibrium Isotherms of Remazol Deep Black RGB Adsorption." Journal of Chemistry 2018 (June 24, 2018): 1–14. http://dx.doi.org/10.1155/2018/8616921.

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In the present paper, the synthesis of metal-organic framework-101 (MIL-101) and Remazol Deep Black RGB (RDB) adsorption on MIL-101 were demonstrated. The kinetics of RDB adsorption on MIL-101 was studied using Weber’s intraparticle diffusion model and the pseudo-first- and pseudo-second-order kinetic models. Particularly, the statistical method of piecewise linear regression and multi-nonlinear regression was employed to analyse the adsorption data according to the previously mentioned kinetic models. The results indicated that the adsorption process followed the three-step pseudo-first-order kinetic equation, which was consistent with the results of the intraparticle diffusion model with three linear segments. This model best described the experimental data. In addition, the adsorption isotherm data were studied using five adsorption models, namely, Langmuir, Freundlich, Redlich–Peterson, Toth, and Sips in nonlinear forms, and the Langmuir model is the most appropriate for the experimental data. The values of energies of activation of adsorption were calculated, and they revealed that the adsorption process was of endothermic chemical nature. A statistical comparison using Akaike information criterion to estimate the goodness of fit of the kinetic and isotherm models was presented.
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26

Wagh, Prakash Bhila, V. S. Shrivastava, and V. S. Shrivastava. "Removal of crystal violate dye from aqueous solution by adsorption on mixture of activated carbon: A kinetic & equilibrium study." JOURNAL OF ADVANCES IN CHEMISTRY 11, no. 9 (2015): 3876–87. http://dx.doi.org/10.24297/jac.v11i9.2682.

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The kinetics and equilibrium study of crystal violate dye adsorption on mixture of activated carbon (PWCAC) and (CSAC) was studied. The use of low cost ecofriendly adsorbent has been investigated as an ideal alternative to the current expensive methods of removing of dye from aqueous solution. This study was done by batch adsorption techniques. The quantitative adsorption kinetic and equilibrium parameter for crystal violate dye were studied using uv-visible adsorption spectroscopy. The effect of initial dye concentration, pH,adsorbent dose, temperature, particle size were determined to find the optimal condition for adsorption. The percentage removal of dye was found to be most effective at pH10and contact time 120 min and at an adsorbent dose 4 g/L of dye. The study indicates that’s, the percentage removal of dye increases with increasing initial dye concentration, adsorption dose and contact time and attains equilibrium at optimum conditions.The equilibrium study of adsorption of crystal violate dye on to mixture of activated carbon was investigated using pseudo first order and pseudo second order kinetic models. The adsorption kinetics was found to follow pseudo second order kinetic model. The equilibrium adsorption data of crystal violate dye on PWCAC and CSAC mixture was analyzed by Langmuir and Freundlich adsorption model. The results show that the Langmuir model provides the best correlation.
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27

Wagh, Prakash Bhila, V. S. Shrivastava, and V. S. Shrivastava. "Removal of crystal violate dye from aqueous solution by adsorption on mixture of activated carbon: A kinetic & equilibrium study." JOURNAL OF ADVANCES IN CHEMISTRY 11, no. 9 (2015): 3876–87. http://dx.doi.org/10.24297/jac.v11i9.848.

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The kinetics and equilibrium study of crystal violate dye adsorption on mixture of activated carbon (PWCAC) and (CSAC) was studied. The use of low cost ecofriendly adsorbent has been investigated as an ideal alternative to the current expensive methods of removing of dye from aqueous solution. This study was done by batch adsorption techniques. The quantitative adsorption kinetic and equilibrium parameter for crystal violate dye were studied using uv-visible adsorption spectroscopy. The effect of initial dye concentration, pH,adsorbent dose, temperature, particle size were determined to find the optimal condition for adsorption. The percentage removal of dye was found to be most effective at pH10and contact time 120 min and at an adsorbent dose 4 g/L of dye. The study indicates that’s, the percentage removal of dye increases with increasing initial dye concentration, adsorption dose and contact time and attains equilibrium at optimum conditions.The equilibrium study of adsorption of crystal violate dye on to mixture of activated carbon was investigated using pseudo first order and pseudo second order kinetic models. The adsorption kinetics was found to follow pseudo second order kinetic model. The equilibrium adsorption data of crystal violate dye on PWCAC and CSAC mixture was analyzed by Langmuir and Freundlich adsorption model. The results show that the Langmuir model provides the best correlation.
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Hafeez, Sarah, X. Fan, and Arshad Hussain. "A Kinetic Study of CO2 Adsorption in Cellulose Acetate Membranes." International Journal of Environmental Science and Development 6, no. 10 (2015): 755–59. http://dx.doi.org/10.7763/ijesd.2015.v6.694.

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Kwakye-Awuah, Bright, Linus Kweku Labik, Isaac Nkrumah, and Craig Williams. "Removal of ammonium ions by laboratory-synthesized zeolite linde type A adsorption from water samples affected by mining activities in Ghana." Journal of Water and Health 12, no. 1 (2013): 151–60. http://dx.doi.org/10.2166/wh.2013.093.

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Ammonium ion adsorption by laboratory-synthesized zeolite (linde type A; LTA) was investigated in batch kinetics experiments. Synthesized zeolite LTA was characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy and particle size analysis. Water samples were taken from the Nyam and Tano rivers in Ghana, and 0.8 g of zeolite was added to 100 ml portions of each sample. Portions of the samples were withdrawn every 30 min for 150 min and the concentration of ammonia in each sample was determined. The removal efficiency of zeolite LTA was evaluated by retrieving the zeolite from the water samples and adding to a fresh sample to repeat the process. Equilibrium data were fitted by Langmuir and Freundlich isotherms. Maximum adsorption capacities were 72.99 mg g−1 for samples from the River Nyam and 72.87 mg g−1 for samples from the River Tano. The equilibrium kinetic data were analysed using adsorption kinetic models: pseudo-first order and pseudo-second order kinetic models. Linear regression was used to estimate the adsorption and kinetic parameters. The results showed that the adsorption followed pseudo-second order kinetics and suggest that zeolite LTA is a good adsorbent for the removal of nitrogen ammonia from water.
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Chatterjee, Arobindo, and Vinit Kumar Jain. "Isothermal, Kinetic, and Thermodynamic Studies of Graphene Oxide Adsorption on Silk." AATCC Journal of Research 8, no. 5 (2021): 18–29. http://dx.doi.org/10.14504/ajr.8.5.3.

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The properties of graphene enriched silk depend on the amount of graphene oxide (GO) adsorption on silk. GO dipping parameters include the GO solution pH, initial GO concentration, dipping time and temperature, and the type of substrate. The effects of GO dipping parameters on the sorption process are studied to achieve the maximum GO adsorption on the silk surface for the preparation of an economical graphene/silk-based textile product. In addition, equilibrium isotherms, kinetics, and thermodynamics of GO adsorption on the silk surface in a batch sorption process are examined to understand the adsorption mechanism. The Freundlich isotherm best describes the adsorption of GO onto the silk. A pseudo-second order kinetic model best describes the kinetics of GO adsorption. Thermodynamic studies reveal that GO adsorption is spontaneous and exothermic.
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31

Lipovský, Marek, Maroš Sirotiak, and Maroš Soldán. "Removal Of Copper From Aqueous Solutions By Using Natural And Fe-Modified Clinoptilolite." Research Papers Faculty of Materials Science and Technology Slovak University of Technology 23, no. 36 (2015): 33–40. http://dx.doi.org/10.1515/rput-2015-0004.

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Abstract Removal of copper from aqueous solution on the natural and modified clinoptilolite was studied under static conditions. Batch adsorptions of copper were performed to investigate the effects of contact time and initial metal ion concentration. The Freundlich and Langmuir adsorption isotherms were used to analyse the experimental data. The kinetic analyses of the adsorption processes were performed using the pseudo-first-order and pseudo-second-order kinetic models.
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32

Petkovska, Menka. "Applications of non-linear frequency response for investigation of adsorption systems." Macedonian Journal of Chemistry and Chemical Engineering 28, no. 1 (2009): 1. http://dx.doi.org/10.20450/mjcce.2009.217.

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Two main directions of application of nonlinear frequency response and the concept of higher order frequency response functions (FRFs) in investigation of adsorption systems are presented, one for development of novel methods for investigation of equilibrium and kinetics of adsorption systems, and the other for fast estimation of periodic steady-states of cyclic adsorption processes. The main advantages of the nonlinear FR methods for estimation of adsorption equilibrium and kinetics are: (1) It is possible to discriminate between different kinetic mechanisms and to select the correct one from the shapes of the second and higher order FRFs. (2) Both equilibrium and kinetic parameters can be estimated from the FRFs. Different experimental arrangements are presented. Estimation of periodic steady-states of cyclic adsorption processes is illustrated on the example of periodic operation of an adsorption column with modulation of the inlet concentration and the column temperature.
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Nahed, Naghmouchi, and Nahdi Kais. "Adsorption of textile dyes on raw Tunisian clay: Equilibrium, kinetics and thermodynamics." JOURNAL OF ADVANCES IN CHEMISTRY 11, no. 6 (2015): 3685–97. http://dx.doi.org/10.24297/jac.v11i6.857.

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Natural clay from Nabeul region (north of Tunisia) was investigated for the removal of two anionic textile dyes (RR120 and BB150) from aqueous solution. The raw clay was characterized by means of XRD, IR spectroscopic, chemical analysis, cation exchange capacity and BET surface area analysis.Adsorption studies were carried out under various parameters such as pH, contact time, initial dye concentration and temperature. The adsorption kinetic data was tested by pseudo-first order, pseudo second-order and intra-particle diffusion kinetic models. The equilibrium data were analyzed using Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherm models. The thermodynamic parameters (DH°, DS° and DG°) of the adsorption were also evaluated. The adsorption process was found spontaneous and endothermic in nature. The kinetics of adsorption were best described by pseudo-second order kinetic model. The Langmuir adsorption model totally agrees with the experimental data.
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34

Xiao-teng, Zhang, Jiang Dong-mei, Xiao Yi-qun, Chen Jun-chang, Hao Shuai, and Xia Liang-shu. "Adsorption of Uranium(VI) from Aqueous Solution by Modified Rice Stem." Journal of Chemistry 2019 (April 23, 2019): 1–10. http://dx.doi.org/10.1155/2019/6409504.

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The biosorption is an effective and economical method to deal with the wastewater with low concentrations of uranium. In this study, we present a systematic investigation of the adsorption properties, such as the kinetics, thermodynamics, and mechanisms, of modified rice stems. The rice stems treated with 0.5 mol/L NaOH solutions show higher removal percentage of uranium than those unmodified under the conditions of initial pH (pH = 4.0), absorbent dosage (5–8 g/L), temperature (T = 298 K), and adsorption equilibrium time (t = 180 min). The removal percentage of uranium(VI) decreases with increasing initial concentration of uranium(VI). The Langmuir isotherm model, which suggests predominant monolayered sorption, is better than Freundlich and Temkin models to elucidate the adsorption isotherm of adsorbed uranium. Kinetic analyses indicate that the uranium(VI) adsorption of the modified rice stem is mainly controlled by surface adsorption. The pseudo-second-order kinetic model, with the correlation coefficient of R2 = 0.9992, fits the adsorption process much better than other kinetic models (e.g., pseudo-second-order kinetic model, Elovich kinetic model, and intraparticle diffusion model). The thermodynamic parameters ΔG0, ΔH0, and ΔS0 demonstrate that the adsorption of uranium(VI) is an endothermic and spontaneous process, which can be promoted by temperature. The adsorption of uranium can change the morphology and the structure characteristics of the modified rice stem through interaction with the adsorption sites, such as O-H, C=O, Si=O, and P-O on the surface.
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35

Sciban, Marina, and Mile Klasnja. "The kinetics of chromium(VI) adsorption from water on some natural materials." Acta Periodica Technologica, no. 33 (2002): 101–8. http://dx.doi.org/10.2298/apt0233101s.

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This paper is concerned with the kinetics of chromium(VI) adsorption by wood sawdust, pulp, and Kraft lignin. In our previous works we determined adsorption efficiency of these adsorbents. In this paper we focused our attention on the influence of contact time on chromium(VI) adsorption from water by the same adsorbents. The analytical data were approached from the following kinetic models: First-order kinetic model, Parabolic diffusion model, Elovich model, and Modified Freundlich model. Elovich model was shown to be the best fit for the description of chromium(VI) adsorption. It was found that adsorption was the fastest on pulp and slowest on Kraft lignin.
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36

Nansa, Vahid Moghaddam, Maryam Otadi, Amir Heydarinasab, and Rahebeh Amiri. "Adsorption of Pb Ions from Oily Wastewater by Anthraquinone Modified Carbon Nanotube." Chemistry & Chemical Technology 15, no. 1 (2021): 89–97. http://dx.doi.org/10.23939/chcht15.01.089.

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The aim of this research was to investigate the adsorption properties of anthraquinone modified carbon nanotube (ACNT) in oily wastewaters containing Pb ions. The modified adsorbents were characterized using Fourier transform infra-red spectroscopy and SEM analysis. The adsorption and regeneration studies were conducted in batch mode using a Taguchi (L16) orthogonal array to optimize experimental runs. The controllable factors used in this study consisted of: pH of the solution (A); adsorbent dosage (B); adsorbent type (C); contact time (D); temperature (F). The effects of each factor were studied at four levels on the removal efficiency of metals from aqueous solution. Concentrations of metal ions were assessed by atomic absorption spectrometer. The total optimum adsorptive removal of lead ions was obtained with C0 = 10 mg•l-1, T = 338 K, pH = 6, m = 0.020 mg and t = 60 min. The Langmuir model was representative to simulate adsorption isotherms. The adsorption kinetics of Pb adsorption by ACNT was modeled using the pseudo-first order, the pseudo-second order, and intraparticle diffusion kinetics equations. The results indicate that the pseudo-second order kinetic equation and intraparticle diffusion model were adequate to describe the adsorption kinetics.
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37

Montalvo Andia, Javier Paul, Lidia Yokoyama, and Luiz Alberto Cesar Teixeira. "Study of the Equilibrium, Kinetics, and Thermodynamics of Boron Removal from Waters with Commercial Magnesium Oxide." International Journal of Chemical Engineering 2018 (June 11, 2018): 1–10. http://dx.doi.org/10.1155/2018/6568548.

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In the present work, the equilibrium, thermodynamics, and kinetics of boron removal from aqueous solutions by the adsorption on commercial magnesium oxide powder were studied in a batch reactor. The adsorption efficiency of boron removal increases with temperature from 25°C to 50°C. The experimental results were fitted to the Langmuir, Freundlich, and Dubinin–Radushkevich (DR) adsorption isotherm models. The Freundlich model provided the best fitting, and the maximum monolayer adsorption capacity of MgO was 36.11 mg·g−1. In addition, experimental kinetic data interpretations were attempted for the pseudo-first-order kinetic model and pseudo-second-order kinetic model. The results show that the pseudo-second-order kinetic model provides the best fit. Such result suggests that the adsorption process seems to occur in two stages due to the two straight slopes obtained through the application of the pseudo-first-order kinetic model, which is confirmed by the adjustment of the results to the pseudo-second-order model. The calculated activation energy (Ea) was 45.5 kJ·mol−1, and the values calculated for ∆G°, ∆H°, and ∆S° were −4.16 kJ·mol−1, 21.7 kJ·mol−1, and 87.3 kJ·mol−1, respectively. These values confirm the spontaneous and endothermic nature of the adsorption process and indicated that the disorder increased at the solid-liquid interface. The results indicate that the controlling step of boron adsorption process on MgO is of a physical nature.
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38

Aydın Temel, Fulya. "Endüstriyel Sızıntı Suyundan Pb(II) Giderimi İçin Genleştirilmiş Perlit Kullanımı: Kinetik Çalışmalar." Turkish Journal of Agriculture - Food Science and Technology 6, no. 3 (2018): 360. http://dx.doi.org/10.24925/turjaf.v6i3.360-364.1748.

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In this study, the removal efficiency of Pb(II) from industrial leachate was investigated by using expanded perlite by adsorption. The effects of pH, contact time, and adsorbent dosage were examined on the Pb(II) removal. The adsorption kinetics were tested to understand the adsorption mechanism using three kinetic models, i.e., Elovich, intraparticle diffusion, and the pseudo second order reaction kinetic models. As the result, the best conformity kinetic model for Pb(II) adsorption on expanded perlite was described as the pseudo second-order (R2>0.99). It is indicated that chemisorption is the determining step of adsorption process rather than mass transfer from industrial leachate. According to the data obtained from intraparticle diffusion model, the adsorption is composed of more than one step. This can be attributed to the fact that the adsorption in the final portion was the intraparticle diffusion while the adsorption in the first portion was the film diffusion. Both film diffusion and intraparticle diffusion processes in the adsorption of Pb(II) on expanded perlite are significant. This study indicated that expanded perlite was an influential alternative adsorbent for the removal of Pb(II) by adsorption from industrial leachate.
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39

Alam, Sultan, Noor Rehman, Noor Ul Amin, Aslam Khan, and Hidayat Ullah. "Adsorption of Methylene Blue Onto Acacia Modesta Carbon: Kinetic and Thermodynamic Study." Zeitschrift für Physikalische Chemie 233, no. 7 (2019): 1019–33. http://dx.doi.org/10.1515/zpch-2018-1150.

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Abstract The adsorption of methylene blue was carried out by adsorbent prepared from Acacia modesta. The sample wood was collected from Dir lower Khyber Pakhtunkhwa Pakistan. Chemical activation of the sample was conducted for surface efficiency. Surface of raw and activated sample was elucidated by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and Fourier transform infrared (FTIR) techniques. Adsorption of methylene blue was studied on raw and activated samples by kinetics adsorption at different adsorption temperatures such as 20 °C, 30 °C and 40 °C. The adsorption equilibrium was established within 2 h. Elovich, Bhangam, and Parabolic diffusion equations were applied to the adsorption kinetics data and were found fit for adsorption. From adsorption kinetic data the parameters like ΔH≠, ΔS≠ and ΔE≠ were calculated and showed that the adsorption process was spontaneous process. Entropy in descending order shows that dye molecules adsorbed in an oriented position.
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40

Huang, Ruihua, Qian Liu, Lujie Zhang, and Bingchao Yang. "Utilization of cross-linked chitosan/bentonite composite in the removal of methyl orange from aqueous solution." Water Science and Technology 71, no. 2 (2014): 174–82. http://dx.doi.org/10.2166/wst.2014.478.

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A kind of biocomposite was prepared by the intercalation of chitosan in bentonite and the cross-linking reaction of chitosan with glutaraldehyde, which was referred to as cross-linked chitosan/bentonite (CCS/BT) composite. Adsorptive removal of methyl orange (MO) from aqueous solutions was investigated by batch method. The adsorption of MO onto CCS/BT composite was affected by the ratio of chitosan to BT and contact time. pH value had only a minor impact on MO adsorption in a wide pH range. Adsorption kinetics was mainly controlled by the pseudo-second-order kinetic model. The adsorption of MO onto CCS/BT composite followed the Langmuir isotherm model, and the maximum adsorption capacity of CCS/BT composite calculated by the Langmuir model was 224.8 mg/g. Experimental results indicated that this adsorbent had a potential for the removal of MO from aqueous solutions.
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41

Islam, MN, N. Ahmed, MY Hossain, AKML Rahman, and A. Sultana. "Effect of pH on the adsorption kinetics of Cr(VI) on sodium chlorite treated coconut coir." Bangladesh Journal of Scientific and Industrial Research 51, no. 2 (2016): 95–100. http://dx.doi.org/10.3329/bjsir.v51i2.28090.

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Coconut coir is a low cost bioadsorbent containing large amount of lignin. In this research work sodium chlorite treated coconut coir (SCT CC) was used to remove Cr(VI) from industrial wastewater by implementing adsorption technique through the investigation of the adsorption kinetics at different pH values. The maximum Cr(VI) adsorption capacity of SCT-CC at pH 2.00, 3.00, 5.00 and 7.00 was 24.75, 23.92, 16.07 and 6.31 mg Cr(VI) g-1 SCT-CC respectively with the dose of 7.5 g/L. The equilibrium established within three hours resulting the maximum removal (95%) of chromium. The adsorption kinetics of Cr(VI) on SCT-CC was found to be regulated by pH of the system. Rate of adsorption was the highest at pH 2.00 and the kinetic data well-fitted with Ho's pseudo second order kinetics. Fourier transform infrared (FT-IR) spectrometry analysis indicated that the carbonyl (C=O) groups and hydroxy (O-H) groups from the lignin structure in coconut coir may be involved in the mechanism of Cr(VI) adsorption and it showed good agreement with the kinetic data to elucidate the adsorption mechanismBangladesh J. Sci. Ind. Res. 51(2), 95-100, 2016
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42

Chen, Jianlong, and Xinwei Lu. "Equilibrium and kinetics studies of Cd(II) sorption on zeolite NaX synthesized from coal gangue." Journal of Water Reuse and Desalination 8, no. 1 (2016): 94–101. http://dx.doi.org/10.2166/wrd.2016.137.

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Abstract The adsorption of Cd(II) from aqueous solution by synthesized zeolite NaX from coal gangue was investigated in a batch adsorption system. The studies include both equilibrium adsorption isotherms and kinetics. Different isotherm models were examined and the adsorption isotherm could be best represented with Langmuir. The adsorption kinetic experimental data were found to be better fitted with the pseudo-second-order kinetic model. An intra-particle diffusion model was employed to investigate the adsorption mechanism. The results showed that the intra-particle diffusion step was not the only rate limiting step. According to the Langmuir equation, the maximum adsorption capacity was 38.61 mg/g, suggesting that zeolite NaX synthesized from coal gangue can be used as a potential green alternative for the removal of Cd(II) from aqueous solution.
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43

Lasia, Andrzej. "Influence of adsorption of organic compounds and surface heterogeneity on the hydrogen evolution reaction." Canadian Journal of Chemistry 75, no. 11 (1997): 1615–23. http://dx.doi.org/10.1139/v97-192.

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The hydrogen evolution reaction on rough or porous surfaces often leads to low Tafel slopes that cannot be explained in terms of the Volmer–Heyrovsky–Tafel mechanism. In addition, adsorption of organic compounds and ions causes an increase in the Tafel slopes. To explain such behavior, a concept of distribution of adsorption energies on heterogeneous surfaces, leading to a distributed kinetics, was studied. Simulations of the dependence of the current and the surface coverage by adsorbed hydrogen on overpotential are presented for different values of the kinetic parameters in the absence and presence of the adsorbed foreign substances. These results were compared with those obtained using the Frumkin/Temkin adsorption isotherm. It was found that for some kinetic parameters and a flat distribution of adsorption energies, low Tafel slopes, similar to those observed experimentally, are obtained. Keywords: hydrogen evolution, adsorption, heterogeneous surfaces, distributed kinetics, Frumkin/Temkin isotherm.
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44

Brdar, Mirjana, Dragana Kukic, Marina Scíban, Vesna Vasic, and Jelena Prodanovic. "Comparison of the generalized and preset-order kinetic equations for description of biosorption data." Acta Periodica Technologica, no. 49 (2018): 11–20. http://dx.doi.org/10.2298/apt1849011b.

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Time course of adsorption of the different pollutants from water is the basis in the testing of an adsorbent. Over the years, several kinetics models have been proposed. Nevertheless, pseudo-first-order and pseudo-second-order kinetic models are by far the most used in the testing. Since various biological materials have complex composition, it is assumed that the adsorption kinetics on such materials, named biosorbents, can not be described sufficiently well by these two models. In this paper, both generalized and preset order kinetic equations were applied on the results of copper and chromium ions adsorption onto spent brewer?s grain. The biosorption of copper ions corresponds the best to the 2.5, and biosorption of chromium ions to the 4.9 reaction order. The analyses of the kinetic tests results on different biosorbents conducted by other authors indicate that the determination of the reaction order should be obtained by generalized kinetic model. It was also established that the f value (relative goodness of curve fitting) was better for the prediction which equations is better, than the R value (correlation coefficient).
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45

CASTRO, Douglas Azevedo, Douglas Henrique PEREIRA, and Paulo Vitor Brandão LEAL. "LANGMUIR ISOTHERM: KINETIC AND EQUILIBRIUM CONSIDERATIONS." Periódico Tchê Química 16, no. 31 (2019): 324–34. http://dx.doi.org/10.52571/ptq.v16.n31.2019.330_periodico31_pgs_324_334.pdf.

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Adsorption processes present increasing applications in the most diverse matrices of systems. In this scenario the Langmuir isotherm has highlight and importance. Although it is the simplest isotherm model, in most adsorption studies it is considered, since it is the basis for the formulation of almost all other models proposed in literature. Thus the Langmuir model is applied in the most diverse types of adsorption processes, such as: removal of metallic ions, organic compounds, pollutants generated by agriculture, dyes, mining effluents, among others. The types of adsorbents are also the most varied with highlight: alternative adsorbents, activated carbon and zeolites. Thus, the Langmuir isotherm evaluation, its origin and approximations is of extreme relevance for students and teachers who are interested and / or working with adsorptive processes. The isotherm was first published in 1916 and it parts of simple concepts for its formulation. Thus, this paper presents deductions from the Langmuir equation in two ways: (a) via kinetic considerations and (b) via equilibrium considerations. In addition, it proposes an evaluation of Gibbs energy of the process and some ways of estimating the number of surface adsorption sites.
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46

Liu, Yan, and Xiaoyi Shen. "Synthesis and application of surface-modified NiFe nanoparticles as a new magnetic nano adsorbent for the removal of nickel ions from aqueous solution." Water Science and Technology 76, no. 10 (2017): 2851–57. http://dx.doi.org/10.2166/wst.2017.453.

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Abstract Surface-modified magnetic Ni2.33Fe alloy nanoparticles were prepared using a hydrothermal method. Thermogravimetric analysis (TG) and Fourier transform infrared spectroscopy (FTIR) tests demonstrated that the surface was successfully modified by sodium citrate. The surface-modified particles can be used for removing nickel ions from aqueous solution. The adsorption kinetics studies were performed and the pseudo-second-order kinetic model successfully described the kinetic data. The diffusion model indicated the adsorption was regulated by both surface and intraparticle diffusion processes. The Freundlich and Langmuir adsorption models were adopted for the mathematical description of adsorption equilibrium, and it was found that the experimental data fitted very well to the Freundlich model.
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47

Kuśmierek, Krzysztof, Paulina Idźkiewicz, Andrzej Świątkowski, and Lidia Dąbek. "Adsorptive removal of pentachlorophenol from aqueous solutions using powdered eggshell." Archives of Environmental Protection 43, no. 3 (2017): 10–16. http://dx.doi.org/10.1515/aep-2017-0029.

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AbstractThe usefulness of untreated powdered eggshell as low-cost adsorbent for the removal of pentachlorophenol (PCP) from aqueous solutions was investigated. The most important parameters affecting the adsorption process, including the pH and ionic strength, were examined. The adsorption characteristics of PCP onto eggshell were evaluated in terms of kinetic and equilibrium parameters. The kinetic data were studied in terms of the pseudo-first order, pseudo-second order and intra-particle diffusion kinetic models. The equilibrium data were analyzed using the Langmuir, Freundlich, Sips and Redlich-Peterson isotherm models. The pseudo-second order model best described the adsorption kinetics. Using the Langmuir equation, the monolayer adsorption capacity of eggshell for PCP was found to be 0.127 mg/g. The results showed that PCP can be effectively removed from aqueous solution employing eggshell as a cheap adsorbent.
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48

Ling, Sharain, Collin Joseph, and How Eng. "Biosorption of lead contaminated wastewater using cattails (Typha angustifolia) leaves: Kinetic studies." Journal of the Serbian Chemical Society 76, no. 7 (2011): 1037–47. http://dx.doi.org/10.2298/jsc100628084l.

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In this work, dried leaves of Typha angustifolia (TA), also known as the common cattail, were used as an adsorbent in kinetic studies of Pb(II) adsorption from synthetic aqueous solutions. Batch adsorption studies with dried TA leaves were conducted and they were able to adsorb Pb(II) from 100 mL of a 25 mg L-1 Pb(II) solution effectively with the optimized dosage of 0.6 g. Adsorption equilibrium was achieved within 8 hours with an effective removal percentage of 86.04 %. Adsorption kinetics was further evaluated using four kinetic models, i.e., the pseudofirst order, pseudo-second order, intraparticle diffusion and Elovich model. Fitting of the data was performed based on linear regression analysis. The sorption kinetic data fitted best to the pseudo-second order model with an R2 of 0.9979, followed closely by the Elovich model with an R2 of 0.9952. The obtained results showed the adsorption of Pb(II) by TA leaves, which is an abundant biological material, is feasible, cheap and environmentally friendly.
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49

Brdar, Mirjana, Marina Sciban, Dragana Kukic, and Tatjana Dosenovic. "Kinetic model for the sorption of copper ions onto sugar beet shreds." Chemical Industry 68, no. 6 (2014): 793–99. http://dx.doi.org/10.2298/hemind130830005b.

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Adsorption kinetics is of great significance to evaluate the performance of adsorption process. The kinetics of copper ions adsorption onto different sized sugar beet shreds has been considered. Sugar beet shreds are very promising adsorbents due to their convenient chemical composition and availability in relatively large quantities in many countries. Experimental data were fitted with pseudo-first and pseudo-second-order kinetic models. Also, we used the intraparticle diffusion model for further analysis of kinetics. The coefficient of determination indicates that, the pseudo-second-order equation obtained by using non-linear least square method, was the most appropriate model for the description of copper ions adsorption onto sugar beet shreds. The adsorption capacities at equilibrium, for a particle size of 224 - 400 ?m, 400 - 750 ?m and 750 - 1000 ?m, are 10 mg/g, 9 mg/g and 8.6 mg/g, respectively. By using intraparticle diffusion model proposed by Weber and Morris, it was obtained that there exist two different stages in adsorption: fast initial adsorption which is further limited by intraparticle diffusion.
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50

Yuan, Xiaoli, Wentang Xia, Juan An, Jianguo Yin, Xuejiao Zhou, and Wenqiang Yang. "Kinetic and Thermodynamic Studies on the Phosphate Adsorption Removal by Dolomite Mineral." Journal of Chemistry 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/853105.

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The efficiency of dolomite to remove phosphate from aqueous solutions was investigated. The experimental results showed that the removal of phosphate by dolomite was rapid (the removal rate over 95% in 60 min) when the initial phosphate concentration is at the range of 10–50 mg/L. Several kinetic models including intraparticle diffusion model, pseudo-first-order model, Elovich model, and pseudo-second-order model were employed to evaluate the kinetics data of phosphate adsorption onto dolomite and pseudo-second-order model was recommended to describe the adsorption kinetics characteristics. Further analysis of the adsorption kinetics indicated that the phosphate removal process was mainly controlled by chemical bonding or chemisorption. Moreover, both Freundlich and Langmuir adsorption isotherms were used to evaluate the experimental data. The results indicated that Langmuir isotherm was more suitable to describe the adsorption characteristics of dolomite. Maximum adsorption capacity of phosphate by dolomite was found to be 4.76 mg phosphorous/g dolomite. Thermodynamic studies showed that phosphate adsorption was exothermic. The study implies that dolomite is an excellent low cost material for phosphate removal in wastewater treatment process.
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