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Journal articles on the topic 'Pseudo first order kinetic'

Author: Grafiati

Published: 4 June 2025

Last updated: 15 July 2025

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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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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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Agarwal, Ajay Kumar. "A COMPARATIVE STUDY FOR CHOOSING THE BEST KINETIC MODEL USING DIFFERENT ERROR METRICS." Journal of Chemical Technology and Metallurgy 60, no. 3 (2025): 401–12. https://doi.org/10.59957/jctm.v60.i3.2025.4.

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In the present investigations, a comparison of fly ash and cow dung ash was carried out to study the adsorption kinetics of Nickel ions present in aqueous solution. Various kinetic models are evaluated during these investigations, which include pseudo-first-order, pseudo-second-order, intra-particle diffusion, fractional power, and Elovich models. These models were exhaustively evaluated and compared using eighteen different error functions. An overall performance indicator metric has also been discussed that helps in ranking the different kinetic models for estimation of adsorption capacity (qt) based on the values of different error functions. After analysing these results, it was observed that the kinetic models can be ranked from best to worst with respect to qt determination for cow dung ash and are as follows: pseudo-first order, pseudo-second order, Intra-particle diffusion, Elovich, and Fractional power. Similarly, for fly ash adsorbent, the ranking of kinetic models from best to worst was found to be: pseudo-second-order, intra-diffusion particle, fractional power, Elovich, and pseudo-first-order.

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Denesa, Erwhyanta Monorizho, Tammy Laysandra, Felycia Edi Soetaredjo, et al. "Binary Adsorption Kinetics of Tetracycline and Doxycycline on HKUST-1: Modification Pseudo First and Second Order Models." Engineering Chemistry 8 (December 13, 2024): 31–40. https://doi.org/10.4028/p-3vojww.

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The investigation of kinetics is crucial for optimizing the adsorption process, particularly in multicomponent systems where several adsorbates compete for active sites on the adsorbent particle. This study presents a novel approach to improve the pseudo-first-order and pseudo-second-order kinetic models by integrating a competition parameter. This parameter quantifies the influence of the adsorbate interaction on the adsorption process. Empirical data of binary adsorption involving doxycycline (DXC) and tetracycline (TTC) were used to validate the improved models. The results indicate that the adjusted pseudo-first-order and pseudo-second-order kinetic models effectively depict the adsorption kinetics when the R² values approach unity. The competition factor, denoted by the parameter α, quantifies the degree to which one adsorbate affects the adsorption capacity of the other. This study indicates that the revised models offer a more thorough understanding of adsorption kinetics in multicomponent systems, thereby facilitating more effective selection of adsorbents and optimization of the process.

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Fouad, Mohamed R., Ahmed F. El-Aswad, and Maher I. Aly. "Mathematical models of the adsorption-desorption kinetics of fenitrothion in clay soil and sandy clay loam soil." Current Chemistry Letters 13, no. 4 (2024): 641–54. http://dx.doi.org/10.5267/j.ccl.2024.6.002.

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Batch adsorption and desorption kinetic experiments of fenitrothion on clay soil and sandy clay loam soil indicated that the equilibration time was approximately 30 hours. The kinetics of adsorption and desorption exhibited two distinct stages: a rapid process in the initial stages followed by a slow process. The pseudo-first-order model followed by the Elovich kinetic model fit the experimental adsorption and desorption data quite well, with high values of R2 and low values of ∆qe% and SSE. Accordingly, the pseudo-first-order model is most suitable for describing the adsorption and desorption kinetics of fenitrothion on clay soil and sandy clay soil. Pseudo-second-order model type-1 and type-2 models fit the experimental adsorption data; however, these models cannot be used to describe desorption kinetics. Moreover, the modified Freundlich model has limited applicability, and the intraparticle diffusion kinetic model cannot describe the kinetics of the adsorption and desorption of fenitrothion on clay and sandy clay loam soils.

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Chen, Jian Qiu, Zhi Liang Wang, Guo Ping Li, Rui Xin Guo, and Yu Zhu Hu. "Kinetics and Equilibrium Study for Acetazolamide in Soils." Advanced Materials Research 781-784 (September 2013): 2296–300. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2296.

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Sorption of Acetazolamide was found to be impacted by clay content and soil solution pH, with higher Kd values for soils with higher clay content and higher Kd values as the pH increased. Sorption data on soils were well fitted with Freundlich model (R2> 0.98). The kinetics of adsorption of Acetazolamide has been discussed using four kinetic models, i.e., the pseudo-first-order model, the pseudo-second-order model, the Elovich equation, the intraparticle diffusion model. The pseudo-first-order model and the pseudo-second-order model were both used to describe the kinetics data, and the pseudo-second-order model could describe the sorption behavior of Acetazolamide well.

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Eze, Kenneth Afamefuna, A. O. Eze, and J. C. Iyidobi. "SORPTION AND DESORPTION KINETICS OF CADMIUM IMMOBILIZATION IN LATERITE SOIL USING ANIMAL BONES." FUDMA JOURNAL OF SCIENCES 9, no. 2 (2025): 49–55. https://doi.org/10.33003/fjs-2025-0902-3103.

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The sorption and desorption kinetics of cadmium immobilization in laterite soil using animal bones were investigated by subjecting the experimental data to various kinetic models. Sorption kinetic was studied with Pseudo first order, pseudo second order and parabolic diffusion while desorption kinetics was investigated with first order, Second order, and Simple Elovich Models. These models were chosen for their significance to understanding and optimizing the kinetics of immobilization processes, since they provide insights into the mechanisms driving sorption and desorption, allowing for the construction of more efficient systems. The SEM analysis of the bones show that they are mainly composed of calcium phosphate in the increasing order of CBA>PBA>HBA. This compound caused the precipitation of metal phosphate, which resulted in decreased mobility because of its low solubility. The physicochemical analysis of the soil shows that it contains iron oxide, which increased the iron and manganese oxide fraction of the soil, which resulted in increased bonding of metal to this fraction thus reducing the amount of metal available for plant uptake. The correlation coefficient R2 was used to determine the suitability of the model to the kinetic data. For pseudo first order, pseudo second order and parabolic diffusion, R2 ranges from 0.419-0.8295, 0.9946- 0.9997 and 0.5116- 0.8295 respectively while for desorption process, it ranges from 0.254-0.349, 0.164 – 0.211 and 0.981- 0.990 for first order, second order and Elovich models respectively for all amendments. This resultsimplied that pseudo second order model best suited the sorption process while desorption was best fitted...

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Muniroh, Syarifatul, and Maya Rahmayanti. "KINETIKA ADSORPSI KROMIUM(VI) YANG TERKANDUNG DALAM LIMBAH BATIK PADA ASAM HUMAT TERMODIFIKASI MAGNETIT (AH-Fe3O4)." Integrated Lab Journal 7, no. 2 (2019): 42–46. https://doi.org/10.5281/zenodo.3524030.

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Chromium(VI) is a hazardous metal which usually exist in wastewater from batik textile industry. This research aim to study the adsorption kinetic of Cr(VI) using humic acid coated on magnetite (HA-Fe3O4). Adsorption kinetic has studied using kinetic models of first order, second order, pseudo first order, and pseudo second order reaction in pH 7 and 10. Result shows that the adsorption kinetic of Cr(VI) by HA-Fe3O4 followed pseudo second order kinetic in pH 7 and 10.

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Alias, A. B., D. Qarizada, A. Y. b. Ariffin, N. M. R. Noraini, and Z. A. Rashid. "Kinetics models of hydrogen sulphide adsorption from hydrogel biochar derived from empty fruit bunch (EFB)." Archives of Materials Science and Engineering 120, no. 1 (2023): 15–21. http://dx.doi.org/10.5604/01.3001.0053.5981.

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This research aims to investigate the detailed state of adsorption kinetics modelling and research on the application of hydrogen sulfide adsorption by hydrogel derived from empty fruit bunch (EFB), the determination of the kinetics parameters, and the comparison between models in a selection of the best-fit model.The kinetics modelling used are pseudo-first-order and pseudo-second-order models. The correlation coefficient was used to evaluate the suitability of the equation R2. After obtaining the results, the comparison was made by comparing the R2 of each model. The pseudo-second-order model has a higher value of correlation coefficient, R2, making it the most suitable kinetics model for adsorption systems.The R2 for pseudo-first-order on the effect of dry bed height was 0.8814, whereas its effect on powder bed height was 0.9537, and that of the wet bed height was 0.9607. Meanwhile, the R2 for pseudo-second-order on the effect of dry bed height was 0.89, on the effect of the powder bed height was 0.99, and on the effect of the bed height of wet was 0.99, the highest among kinetic models. Based on the results, the pseudo-second-order model best describes the adsorption of hydrogen sulfide (H2S) by hydrogel biochar.The kinetics modelling used are pseudo-first-order, and pseudo-second-order models for hydrogen sulfide adsorption by hydrogel originating from empty fruit bunches (EFB).Based on the results, the pseudo-second-order model best describes the adsorption of hydrogen sulfide (H2S) by hydrogel biochar. Kinetic studies are important in understanding the reactions and design of the process.The authenticity results of this article were found to be 17% similar. The novelty of this paper is the kinetics study of the new adsorbent developed based on EFB to adsorb H2S.

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L Salami, DO Olumuyiwa, EA Alfred, and OS Olakanmi. "Kinetic modelling of dumpsite leachate treatment using Musa sapientum peels as bio-sorbent." Global Journal of Engineering and Technology Advances 9, no. 2 (2021): 024–31. http://dx.doi.org/10.30574/gjeta.2021.9.2.0117.

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Kinetics models are very vital to dumpsite operators and planners as they provide relevant information for effective treatment of leachates. The aim of this work is to model the kinetic process of treatment of Lagos dumpsite leachate using Musa sapientum peels as bio-sorbent with a view of establishing the kinetic parameters of the treatment process. Musa sapientum peels which were collected from Ayetoro market in Epe Local Government area of Lagos State were used to prepare the bio-sorbent. Kinetic process was carried out using 1 g of the prepared bio-sorbent in 100 ml Lagos dumpsite leachate in different conical flasks and at various contacting time. The kinetic data obtained were fitted to different kinetics models. The kinetics models tested were Fractional power model, Lagregren pseudo first – order model, Pseudo second – order model, Kuo – Lotse kinetic model, Blanchard kinetic model and Elovich kinetic model. Other kinetics models considered were Sobkowsk – Czerwi kinetic model, Intraparticle diffusion (IPD) model, Behnajady – Modirshahla – Ghanbery (BMG) model and Diffusion – Chemisorption model. Coefficient of determination (R2) values and the expected nature of the plots of the models were used to screen the tested models. The results revealed that the Pseudo second – order kinetic model has the best R2 value of 0.99996 and the graph followed the expected nature of the plot hence it was adopted in this work. It was concluded that Pseudo second – order kinetic model can be used to navigate the treatment process of Lagos dumpsite using Musa sapientum peels as bio-sorbent.

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Okonofua, Ehizonomhen Solomon, Kayode Hassan Lasisi, and Sunday Egbiki. "Modeling the Reaction and Transport Mechanism for Total Petroleum Hydrocarbon Using Selected Linear and Nonlinear Error Functions." Jurnal Kejuruteraan 32, no. 4 (2020): 621–27. http://dx.doi.org/10.17576/jkukm-2020-32(4)-09.

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In this article, field pilot study was undertaken to examine the transport mechanism for total petroleum hydrocarbon remediation in varying concentration using pseudo first order, pseudo second order and intra particle diffusion kinetic models in land farming treatment. Soil samples were artificially contaminated in varying concentration of 1,000 mg/kg (low), 3,000 mg/kg (medium) and 5,000 mg/kg (high) and treated using organic and inorganic fertilizers for a period of 150days which is the duration for effective remediation treatment. The results from the treated samples were subjected to kinetics studies while coefficient of determination (R2) was applied on the residual total petroleum hydrocarbon (TPH) after 150 days of treatment, pseudo first order had R2 values of 0.7898 (low), 0.6776 (medium) and 0.6131 (high). Pseudo second order had R2 values of 0.9737 (low), 0.9467 (medium), 0.7863 (high) while intra particle diffusion had R2 values of 0.9940 (low), 0.9821 (medium) and 0.9489 (high) respectively. The results indicate that intra particle diffusion model best described the kinetics mechanism of TPH remediation using land farming treatment; but when the alteration in the error structure associated with transforming a nonlinear kinetic equation into linear equation is minimized using nonlinear regression optimization procedure, pseudo first order emerged as the best kinetic model having the least sum of errors as 0.000270 (low), 0.000185 (medium) and 0.000278 (high).

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Estrada-Arriaga, E. B., and N. P. Mijaylova. "A comparison of biodegradation kinetic models applied to estrogen removal with nitrifying activated sludge." Water Science and Technology 62, no. 9 (2010): 2183–89. http://dx.doi.org/10.2166/wst.2010.441.

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The biological degradation of estrone (E1), estradiol (E2) and ethinylestradiol (EE2) was studied in batch experiments at typical concentration levels using nitrifying activated sludge from a membrane bioreactor (MBR). Since first-order, pseudo first-order and Monod-type kinetics were observed. Pseudo first order kinetic was reformulated using only the soluble concentrations S and assuming adsorption coefficient KD of the estrogens. For the adsorption coefficients KD determination, activated sludge from MBR was spiked with the respective target compounds and stirred. Finally, the water was analyzed. The KD values of estrogens ranged from 0.323 to 0.474 L/g. Greater than 98% of E1, E2 and EE2 were found to be removed in batch reactors. The measured data were linearly regressed giving R2 values ranging from 0.748 to 0.990. According to these results, the biodegradation kinetics were adjusted to pseudo first-order assuming adsorption coefficient KD and Monod-type kinetic. The biodegradation rate constant k of the estrogens were: E1 and E2 &gt; 78.52 L/gVSS d and 12.41 L/gVSS d for EE2. Monod-type kinetic indicates that these compounds are biodegradated by co-metabolism. E2 was oxidized into E1.

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Baigenzhenov, Omirserik, Alibek Khabiyev, Brajendra Mishra, M. Deniz Turan, Merey Akbarov, and Tatyana Chepushtanova. "Uranium (VI) Recovery from Black Shale Leaching Solutions Using Ion Exchange: Kinetics and Equilibrium Studies." Minerals 10, no. 8 (2020): 689. http://dx.doi.org/10.3390/min10080689.

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This work studies the removal of uranium ions from chemically leached solutions by sorption using two weak and two strong base anionites. Batch sorption experiments were performed to evaluate the optimum conditions at pH 1.2–2.2, 1.0 g resin dose for 1–12 h contact time at room temperature. These experiments addressed sorption kinetics and sorption isotherm. The maximum sorption capacity reached 55.8 mg/g at room temperature. The kinetics data are well described by the pseudo-second-order kinetic model at initial uranium concentration of 0.62 mg·L−1. To describe sorption kinetics pseudo-first-order, pseudo-second-order and intraparticle diffusion models were proposed. Studies indicated that the sorption of uranium can be fitted by a pseudo-second-order kinetic model very well. Equilibria were described by Langmuir, Freundlich, and Dubinin–Radushkevich equations. The experimental sorption isotherm is successfully described by the Langmuir model.

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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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Mu, Jin Xia, Ming Juan Shi, Xiao Ying Wu, and Jin Ye Li. "Adsorptive Removal of Methylene Blue by Ginkgo Leaf Powder." Applied Mechanics and Materials 130-134 (October 2011): 829–32. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.829.

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The adsorption of methylene blue (MB) from aqueous solution using a low-cost adsorbent, ginkgo leaf powder, has been studied. The equilibrium data were fitted to Langmuir and Freundlich isotherms and the equilibrium adsorption was best described by the Langmuir isotherm model with maximum monolayer adsorption capacities found to be 39 mg/g. The sorption was analyzed using pseudo-first-order and pseudo-second order kinetic models, and the sorption kinetics was found to follow a pseudo-second order kinetic model. Ginkgo leaf appears as a prospective adsorbent for the removal of methylene blue from aqueous solution.

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Korovin, Vadym, Yurii Pohorielov, Yurii Shestak, Oleksandr Valiaiev, and Jose Luis Cortina. "Kinetics of scandium recovery by TVEX-TBP from the solution formed after the salt chlorinator cake leaching." E3S Web of Conferences 168 (2020): 00050. http://dx.doi.org/10.1051/e3sconf/202016800050.

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Kinetics of scandium recovery by TVEX containing tributyl phosphate was studied from the clarified leaching solution of salt chlorinator cake. To assess the contribution of each diffusion phase, experimental data were analyzed using a graphic method. To define the contribution of chemical interaction into the scandium extraction process, recovery kinetics was quantitatively described using pseudo-first order, pseudo-second order kinetic models and Elovich equation in linearized form. It was established that recovery kinetics was most accurately described with the pseudo-second-order model.

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Samarghandy, Mohammad Reza, Edris Hoseinzade, Mahmood Taghavi, and Saman Hoseinzadeh. "Biosorption of Reactive Black 5 from aqueous solution using acid-treated biomass from potato peel waste." BioResources 6, no. 4 (2011): 4840–55. http://dx.doi.org/10.15376/biores.6.4.4840-4855.

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The goal of this study was to survey the feasibility of the biosorption of Reactive Black 5 (RB5) from aqueous solutions using biomass prepared from potato peel waste. Adsorption isotherms were constructed, and the kinetics of dye adsorption were studied. Langmuir and Freundlich isotherms were constructed, and pseudo-first order, pseudo-second order, and modified pseudo-first order kinetic models were studied. Maximum adsorption (85.5%) was observed at a pH of 3, and uptake decreased with increasing pH. The biosorption of RB5 increased with increasing contact time and reached equilibrium after two hours. RB5 removal efficiency decreased with an increase in the initial dye concentration, but the uptake of dye increased. Adsorption data conformed to the Langmuir isotherm model and pseudo-first order kinetics.

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L, Salami, Olumuyiwa DO, Alfred EA, and Olakanmi OS. "Kinetic modelling of dumpsite leachate treatment using Musa sapientum peels as bio-sorbent." Global Journal of Engineering and Technology Advances 9, no. 2 (2021): 024–31. https://doi.org/10.5281/zenodo.5766273.

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Kinetics models are very vital to dumpsite operators and planners as they provide relevant information for effective treatment of leachates. The aim of this work is to model the kinetic process of treatment of Lagos dumpsite leachate using Musa sapientum peels as bio-sorbent with a view of establishing the kinetic parameters of the treatment process. Musa sapientum peels which were collected from Ayetoro market in Epe Local Government area of Lagos State were used to prepare the bio-sorbent. Kinetic process was carried out using 1 g of the prepared bio-sorbent in 100 ml Lagos dumpsite leachate in different conical flasks and at various contacting time. The kinetic data obtained were fitted to different kinetics models. The kinetics models tested were Fractional power model, Lagregren pseudo first – order model, Pseudo second – order model, Kuo – Lotse kinetic model, Blanchard kinetic model and Elovich kinetic model. Other kinetics models considered were Sobkowsk – Czerwi kinetic model, Intraparticle diffusion (IPD) model, Behnajady – Modirshahla – Ghanbery (BMG) model and Diffusion – Chemisorption model. Coefficient of determination (R2) values and the expected nature of the plots of the models were used to screen the tested models. The results revealed that the Pseudo second – order kinetic model has the best R2 value of 0.99996 and the graph followed the expected nature of the plot hence it was adopted in this work. It was concluded that Pseudo second – order kinetic model can be used to navigate the treatment process of Lagos dumpsite using Musa sapientum peels as bio-sorbent.

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Palapa, Neza Rahayu, Tarmizi Taher, Muhammad Said, Risfidian Mohadi, and Aldes Lesbani. "Adsorption of Cobalt (II) on Layered Double Hydroxides (Mg/Al and Ca/Al) In Aqueous Medium : Kinetic and Thermodynamic Aspect." Science and Technology Indonesia 3, no. 4 (2018): 189. http://dx.doi.org/10.26554/sti.2018.3.4.189-194.

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    Layered double hydroxides Mg/Al and Ca/Al has been synthesized by co-precipitation method with molar ratio M2+:M3+ (3:1) at pH 10. The synthesized materials were characterized by XRD and FTIR. The materials were used as adsorbent for the removal Cobalt (II) in aqueous solution. The adsorption experiments were studied through some variables adsorption such as variation of contact time, variation of temperature and variation of initial concentration. Kinetic parameters was obtained from variation of contact time. Data was analyzed by pseudo-first-order and pseudo-second-order kinetics models in linear analyses. The kinetic studies showed that the adsorption process more fitted by pseudo-second-order than pseudo-first-order based on coefficient correlation. Isotherm parameters was calculated using Langmuir and Freundlich isotherm models. The adsorption process was spontaneous and endothermic.   

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Okonofua, Ehizonomhen Solomon, Kayode Hassan Lasisi, and Sunday Egbiki. "Modeling the Reaction and Transport Mechanism for Total Petroleum Hydrocarbon Using Selected Linear and Nonlinear Error Functions." Jurnal Kejuruteraan 32, no. 3 (2020): 423–29. http://dx.doi.org/10.17576/jkukm-2020-32(3)-07.

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In this article, field pilot study was undertaken to examine the transport mechanism for total petroleum hydrocarbon remediation in varying concentration using pseudo first order, pseudo second order and intra particle diffusion kinetic models in land farming treatment. Soil samples were artificially contaminated in varying concentration of 1,000 mg/kg (low), 3,000 mg/kg (medium) and 5,000 mg/kg (high) and treated using organic and inorganic fertilizers for a period of 150days which is the duration for effective remediation treatment. The results from the treated samples were subjected to kinetics studies while coefficient of determination (R2) was applied on the residual total petroleum hydrocarbon (TPH) after 150 days of treatment, pseudo first order had R2 values of 0.7898 (low), 0.6776 (medium) and 0.6131 (high). Pseudo second order had R2 values of 0.9737 (low), 0.9467 (medium), 0.7863 (high) while intra particle diffusion had R2 values of 0.9940 (low), 0.9821 (medium) and 0.9489 (high) respectively. The results indicate that intra particle diffusion model best described the kinetics mechanism of TPH remediation using land farming treatment; but when the alteration in the error structure associated with transforming a nonlinear kinetic equation into linear equation is minimized using nonlinear regression optimization procedure, pseudo first order emerged as the best kinetic model having the least sum of errors as 0.000270 (low), 0.000185 (medium) and 0.000278 (high).

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Schüürmann, Gerrit. "First-order and pseudo-first-order elimination kinetics." Science of The Total Environment 109-110 (December 1991): 395–405. http://dx.doi.org/10.1016/0048-9697(91)90194-j.

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Azadeh, Jafari Rad. "Synthesis of copper oxide nanoparticles on activated carbon for pollutant removal in tartrazine structure." Journal of Composites and Compounds 2, no. 2 (2020): 99–104. https://doi.org/10.29252/jcc.2.2.6.

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In this study, activated carbon particles were modified by copper oxide to remove the anionic Tartrazine dye from aqueous solutions. Adsorption studies were performed as batch studies and the influences of pH, initial dye concentrations, and contact times were evaluated. Maximum removal percentage was obtained for the initial concentration of 30 mg/L and the equilibrium of the adsorption was achieved within 60 minutes of contact time. The Langmuir and Freundlich kinetic models were used for analyzing the equilibrium data. It was shown that better fitting was observed by the Langmuir model. Pseudo-first-order and Pseudo-second-order kinetic models were also applied to understand the kinetics of the adsorption processes. It was found that the Tartrazine adsorption followed the pseudo-second-order kinetic model.

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Revellame, Emmanuel D., Dhan Lord Fortela, Wayne Sharp, Rafael Hernandez, and Mark E. Zappi. "Adsorption kinetic modeling using pseudo-first order and pseudo-second order rate laws: A review." Cleaner Engineering and Technology 1 (December 2020): 100032. http://dx.doi.org/10.1016/j.clet.2020.100032.

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Tot, Nataša, Vesna Despotović, Sanja Panić, et al. "Comparative Study on the Removal Efficiency of Clomazone and Amitriptyline via Adsorption and Photocatalysis in Aqueous Media: Kinetic Models and Toxicity Assessment." Materials 17, no. 6 (2024): 1369. http://dx.doi.org/10.3390/ma17061369.

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This study aimed to compare the effectiveness of adsorption and photocatalysis techniques at removing the herbicide clomazone (CLO) and the antidepressant known as amitriptyline (AMI) from water. This study employed kinetic models to analyze the removal processes and assess the potential toxicity of the treated water. The structure and morphology of the prepared multi-walled carbon nanotubes were characterized as adsorbents by transmission electron microscopy, X-ray diffraction, Fourier transform infrared techniques, and Raman spectroscopy. The adsorption kinetics of CLO and AMI were studied on the pristine and functionalized multi-walled carbon nanotubes. Kinetic studies were performed by modeling the obtained experimental data using three kinetic models: pseudo-first-order, pseudo-second-order, and Elovich kinetic models. On the other hand, the efficiency of CLO and AMI photodegradation was examined as a function of the type of irradiation (UV and simulated solar irradiation) and type of TiO2 photocatalyst (Aeroxide and Kronos). Under the experimental conditions employed, the reaction followed pseudo-first-order kinetics. Additionally, in order to assess the toxicity of water containing CLO, AMI, and their intermediates, toxicity assessments were conducted using human fetal lung fibroblast cells. The results obtained indicate the effectiveness of both methods and provide valuable insights into their removal mechanisms, contributing to the advancement of sustainable water treatment strategies.

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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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Fu, Dan, Yi He Zhang, He Li Wang, and Feng Zhu Lv. "Rice Husk Active Carbon as a Potential Low-Cost Adsorbent for TNT Wastewater." Advanced Materials Research 356-360 (October 2011): 1289–92. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.1289.

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In this paper, the adsorption properties of TNT on Rice husk active carbon (RHAC) were investigated. The effects of contact time was examined. Kinetic data obtained at different concentrations were conducted using Lagergren’s pseudo first-order, pseudo second-order and diffusion models. The regression results showed that the adsorption kinetics was more accurately represented by pseudo second-order model. The study indicates that there is significant potential for RHAC as an adsorbent material for TNT removal from wastewater.

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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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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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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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Khezami, L., Kamal K. Taha, Imed Ghiloufi, and Lassaad El Mir. "Adsorption and photocatalytic degradation of malachite green by vanadium doped zinc oxide nanoparticles." Water Science and Technology 73, no. 4 (2015): 881–89. http://dx.doi.org/10.2166/wst.2015.555.

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Herein the degradation of malachite green (MG) dye from aqueous medium by vanadium doped zinc oxide (ZnO:V3%) nanopowder was investigated. The specific surface area and pore volume of the nanopowder was characterized by nitrogen adsorption method. Batch experimental procedures were conducted to investigate the adsorption and photocatalytic degradation of MG dye. Adsorption kinetics investigations were performed by varying the amount of the catalyst and the initial dye concentrations. Adsorption and photocatalytic degradation data were modeled using the Lagergren pseudo-first-order and second-order kinetic equation. The results showed that the ZnO:V3% nanopowder was particularly effective for the removal of MG and data were found to comply with Lagergreen pseudo-first-order kinetic model.

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Luo, Wen Lian. "Study for Absorption Heavy Metals by Pickled Diatomite." Advanced Materials Research 741 (August 2013): 55–58. http://dx.doi.org/10.4028/www.scientific.net/amr.741.55.

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The removal of Cu2+ ions from aqueous solution was studied using pickled diatomite samples. The linear Langmuir and Freundlich adsorption equations were applied to describe the equilibrium isotherms. The pseudo-first-order and pseudo-second-order models were used to determine the kinetic data. The experimental data were well fitted by the pseudo-second-order kinetic model.

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Abbas, Ammar S., Muthana J. Ahmed, and Teeba M. Darweesh. "Adsorption of Fluoroquinolones Antibiotics on Activated Carbon by K2CO3 with Microwave Assisted Activation." Iraqi Journal of Chemical and Petroleum Engineering 17, no. 2 (2016): 15–23. http://dx.doi.org/10.31699/ijcpe.2016.2.3.

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The preparation of low cost activated carbon from date stones and microwave method by using K2CO3 as chemical activator were investigated. The prepared activated carbon was used to remove fluoroquinolones antibiotics from aqueous solution. The characterizations of the activated carbon is represented by surface area, pore volume, ash content, moisture content, bulk density, and iodine number. The adsorbed fluoroquinolones antibiotics are Ciprofloxcin (CIP), Norfloxcin (NOR) and Levofloxcin (LEVO). Different variables as pH, initial concentrations and contact time were studied to show the efficieny of prepared activated carbon. The experimental adsorption data were analyzed by Lungmuir, Freundlich, and Temkin isotherm. The experimental results are described by Lungmiur isotherm. The kinetic data were fitted to pseudo-first order kinetics, pseudo-second order kinetics and interparticle diffusion model. The kinetic adsorption data were best fitted by psuedo-second order kinetic.

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Moussout, Hamou, Hammou Ahlafi, Mustapha Aazza, and Hamid Maghat. "Critical of linear and nonlinear equations of pseudo-first order and pseudo-second order kinetic models." Karbala International Journal of Modern Science 4, no. 2 (2018): 244–54. http://dx.doi.org/10.1016/j.kijoms.2018.04.001.

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Sripiboon, Siriporn, and Panida Charnkeitkong. "Potassium Hydroxide Activation as an Adsorbent for Kinetic Models of Hexavalent Chromium Adsorptions onto Garcinia mangosteen Shell." Materials Science Forum 1086 (April 27, 2023): 115–22. http://dx.doi.org/10.4028/p-gw4opv.

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The utilized adsorption kinetic models, i.e., pseudo-zero order, pseudo-first-order, pseudo-second order, intraparticle diffusion, Bangham’s pore diffusion, liquid film diffusion, modified Freundlich and Elovich models have been cultivated the hexavalent chromium adsorption process. A high correlation coefficient (R2) and a small residual root mean square error (RMSE) and Chi-square (χ2) can be depicted in the pseudo-first order for the kinetic adsorption process of hexavalent chromium adsorption on the activated mangosteen shell with potassium hydroxide and carbonized at 400 °C for 2 h as a biochar adsorbent which has a specific surface area of 164 m2/g.

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Parker, Vernon D. "Is the single transition-state model appropriate for the fundamental reactions of organic chemistry?" Pure and Applied Chemistry 77, no. 11 (2005): 1823–33. http://dx.doi.org/10.1351/pac200577111823.

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In recent years, we have reported that a number of organic reactions generally believed to follow simple second-order kinetics actually follow a more complex mechanism. This mechanism, the reversible consecutive second-order mechanism, involves the reversible formation of a kinetically significant reactant complex intermediate followed by irreversible product formation. The mechanism is illustrated for the general reaction between reactant and excess reagent under pseudo-first-order conditions in eq. i where kf' is the pseudo-first-order rate constant equal to kf[Excess Reagent].Reactant + Excess reagent = Reactant complex = Products (i)The mechanisms are determined for the various systems, and the kinetics of the complex mechanisms are resolved by our "non-steady-state kinetic data analysis". The basis for the non-steady-state kinetic method will be presented along with examples. The problems encountered in attempting to identify intermediates formed in low concentration will be discussed.

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Zhang, Zefei, Cholhwan Kim, Carlos Fernandez, et al. "Adsorption removal of methylene blue from aqueous solution on carbon-coated Fe3O4 microspheres functionalized with chloroacetic acid." Science and Engineering of Composite Materials 25, no. 2 (2018): 353–61. http://dx.doi.org/10.1515/secm-2016-0138.

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AbstractWe report the preparation and employability of carbon-coated Fe3O4(Fe3O4/C) microspheres functionalized with chloroacetic acid (CAA) for the removal of methylene blue (MB) in aqueous solution. The prepared magnetic microspheres (Fe3O4/C-CAA) were characterized by the following techniques: X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectrometer, vibrating sample magnetometry, and Brunauer-Emmett-Teller. The characterization results showed that Fe3O4/C microspheres were modified by CAA without any phase change. Fe3O4/C-CAA microspheres have higher adsorption capacity for MB compared to Fe3O4/C microspheres. The Langmuir, Freundlich, and Temkin adsorption models were applied to describe the equilibrium isotherms, and the Langmuir adsorption model fitted well with the equilibrium data. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetics data. However, the pseudo-second-order kinetic model fitted better with the adsorption kinetics data.

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Ghee, K. Z., Z. Mokhtar, and M. Hasan. "Removal of diclofenac by photocatalysis utilizing crosslinked chitosan/oil-palm embedded titanium dioxide." IOP Conference Series: Earth and Environmental Science 1369, no. 1 (2024): 012016. http://dx.doi.org/10.1088/1755-1315/1369/1/012016.

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Abstract Photocatalytic degradation of diclofenac from aqueous solution utilizing cross-linked chitosan/oil palm ash embedded titanium dioxide composite beads (TiO2-COPA) was studied. Fourier Transform Infrared Spectroscopy (FTIR) was established to identify the functional groups of the composite beads. In order to conduct a kinetic and isotherm analysis, a number of parameters were taken into account, initial diclofenac concentration (10–50 mg L−1) and the dosage of composite beads (0.2–0.4 g). When compared to other concentrations, the initial concentration of diclofenac at 10 mg L−1 had the highest degradation percentage (51.32 %). With 69.32 % degradation, 0.4 g of titanium TiO2-COPA composite beads showed the greatest percentage. Photocatalytic degradation kinetics data were evaluated using pseudo-first order and pseudo-second order models. The rate constants for these models for under different initial concentrations were assessed. Kinetic studies proved that the photocatalysis conformed with the pseudo-first-order model. Langmuir Hinshelwood was utilized to analyze the equilibrium data at different diclofenac concentrations.

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Li, Mei, Yi Luo, Ru Chun Wu, Hong Yu Liang, and Shuang Fei Wang. "Kinetics of Phenol Adsorption onto Activated Carbon Fiber." Advanced Materials Research 356-360 (October 2011): 1524–27. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.1524.

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The adsorption of phenol onto activated carbon fiber (ACF) from aqueous solutions were studied.The adsorption kinetics of phenol by ACF can be described by the Lagergren first-order and pseudo second-order kinetic models, respectively.The Lagergren first-order was verified to be the best to describe the adsorption data. The intraparticle diffusion is not the only rate-controlling step .

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Datsko, Tatiana, and V. Zelentsov. "Kinetic and Adsorption Mechanism of Methylene Blue by Nanocomposite TiO2/Diatomite and Its Components." Elektronnaya Obrabotka Materialov 59, no. 3 (2023): 46–54. http://dx.doi.org/10.52577/eom.2023.59.3.46.

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Studies on the kinetics of adsorption of methylene blue dye (MB) from an aqueous solution on a DDT photocatalyst (nanoscale titanium dioxide in the anatase phase deposited on diatomite) and its components – diatomite D and anatase TiO2 are presented. The effect of the initial concentration and pH of the MB solution on the adsorption process rate is investigated. The kinetic adsorption data were processed using two simplified kinetic models – of the pseudo-first and pseudo-second order. A model of the kinetics of intraparticle diffusion was used to study the adsorption mechanism. It was found that the kinetics of adsorption of methylene blue on the surface of D, TiO2 and DDT is best described by a pseudo-second order model. It is shown that the adsorption of methylene blue on D and DDT is a multi-stage process with adsorption on the outer surface and inside the particles, and th

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Bakar, Siti Asmah, Hussein Saed Geedi, Mohd Hairul Khamidun, Radin Maya Saphira Radin Mohamed, Mohammad Faizal Che Daud, and Umi Fazara Md Ali. "Evaluation lead removal kinetics modelling of adsorption by using composite of Chitosan and Ceramic waste." IOP Conference Series: Earth and Environmental Science 1205, no. 1 (2023): 012010. http://dx.doi.org/10.1088/1755-1315/1205/1/012010.

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Abstract This study focuses on understanding the Pb adsorption kinetics from greywater using a composite of chitosan and ceramic waste (CCCW), which is suitable for preserving water quality. For ease and general application, a kinetic model with a simple expression and a manageable small set of parameters that nevertheless provides a fair adsorption description in the equilibrium state is still critical. Although some current kinetic models, such as the pseudo-second-order type, meet these conditions, their performance is still questionable, especially when applied to a variety of experimental data. Batch adsorption experiments were carried out with the predetermined value of the operational parameter such as adsorbent dosage, contact time, and shaking speed. Kinetic models such as pseudo-first order, pseudo-second order, intraparticle diffusion kinetic model, Avrami model, and the Bangham model were used in this study to understand the kinetics of removal of lead from greywater. The efficacy results of adsorbent’s dose in lead removal process with increasing adsorption capacity with contact time from 0.0014 to 0.00277 mg/g, the removal efficiency increases from 45.90 to 90.83%. The most significant contribution of this work is an understanding of the optimal kinetics model that can describe the behaviour of lead adsorption on CCCW. Five models for the adsorption of Pb2+ have been identified to clarify the kinetics models’ usefulness in accuracy based on rank order. This study may provide insight into understanding the ability and usability of the appropriate model in kinetics adsorption.

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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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Tran, Hai Nguyen. "Differences between Chemical Reaction Kinetics and Adsorption Kinetics: Fundamentals and Discussion." Journal of Technical Education Science, no. 70B (June 28, 2022): 33–47. http://dx.doi.org/10.54644/jte.70b.2022.1154.

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Adsorption kinetics is an essential part in adsorption studies. The pseudo-first-order (PFO) and pseudo-second-order (PSO) models are frequently used to model the experimental dataset of time-dependent adsorption. The differential equations (based on reaction rate and rate law) of the PFO and PSO models are similar to those of chemical reactions (i.e., first and second order-kinetic reactions). The adsorption kinetics is illustrated through the plot of qt (the amount of adsorbate adsorbed by adsorbent at time t) vs. time. This plot includes two important regions (kinetic and equilibrium). The adsorption rate constant (k1(PFO) or k2(PSO), respectively) of the PFO or PSO models needs to be calculated from two regions. The appropriate selection of initial adsorbate concentrations for studying adsorption kinetics should be based on adsorption isotherm to ensure that adsorption sites in adsorbent (material) are highly (nearly fully) covered by adsorbate (solute). Only in this case, the rate constant of the adsorption is accurately obtained.

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Senthilkumaar, S., S. K. Krishna, P. Kalaamanic, C. V. Subburamaan, N. Ganapathy Subramaniam, and T. W. Kang. "Kinetic Approach for the Adsorption of Organophosphorous Pesticides from Aqueous Solution Using “Waste” Jute Fiber Carbon." E-Journal of Chemistry 7, s1 (2010): S511—S519. http://dx.doi.org/10.1155/2010/947070.

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Chemically activated “Waste” Jute Fiber carbon has been effectively used for the removal of five organophosphorous pesticides (malathion, monocrotophos, methylparathion, phosphamidon and dimethoate) from aqueous solutions. The prepared activated jute fiber carbon was characterized by using Elemental analyzer and proximate analysis methods. The adsorption equilibrium was examined at 28ºC. Three different kinetic models, the pseudo first order, pseudo second order and Elovich kinetic models were selected to analyses the adsorption process. To compare the fitness of pseudo first order and pseudo second order, sum of the squares of the errors and correlation coefficient, r2values were calculated. The Elovich model was used to confirm the chemisorptions.

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Jalija, D. O., and A. Uzairu. "Adsorption of Cu (II) and Ni (II) Ions from Solution onto Calcium Alginate Beads." Journal of Applied Sciences and Environmental Management 24, no. 2 (2020): 329–33. http://dx.doi.org/10.4314/jasem.v24i2.20.

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The objective of this study was to investigate the biosorption of Cu (II) and Ni (II) ions from aqueous solution by calcium alginate beads. The effects of solution pH, contact time and initial metal ion concentration were evaluated. The results showed that maximum Cu (II) removal (93.10%) occurred at pH of 9.0, contact time of 120 minutes and initial ion concentration of 10 mg/L while that of Ni (II) was 94.6%, which was achieved at pH of 8.0, contact time of 120 minutes and initial ion concentration of 10 mg/L. The equilibrium data fitted well to the Langmuir Isotherm indicating that the process is a monolayer adsorption. The coefficients of determination, R2, values for the Langmuir Isotherm were 0.9799 and 0.9822 respectively for Cu (II) and Ni (II) ions. The values of the maximum biosorption capacity, Qo, were 10.79 and 6.25 mgg-1 respectively. The kinetic data also revealed that the sorption process could best be described by the pseudo – second order kinetic model. The R2 values for the pseudo – second order kinetic plots for Cu (II) and Ni (II) were 0.9988 and 0.9969 respectively. These values were higher than those for the pseudo – first order plots. The values of the biosorption capacity qe obtained from the pseudo – second order plots were very close to the experimental values of qe indicating that the biosorption process follows the second order kinetics. This study has therefore shown that calcium alginate beads can be used for the removal of Cu (II) and Ni (II) ions from wastewaters. Keywords: Keywords: Adsorption, Calcium alginate, Isotherm, Langmuir, Pseudo- first order, Pseudo-second order

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Nga, J., J. Avom, J. Tonga Limbe, D. Ndinteh, H. L. Assonfack та C. M. Kede. "Kinetics and Thermodynamics of β-Carotene Adsorption onto Acid-Activated Clays Modified by Zero Valent Iron". Journal of Chemistry 2022 (10 жовтня 2022): 1–15. http://dx.doi.org/10.1155/2022/6505556.

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The adsorption of β-carotene from crude palm oil onto acid-activated clay and clay modified by zero valent iron (ZVI) was investigated in this work. Spectroscopic studies including FTIR, XRD, and SEM were used for its characterization. The adsorption characteristics such as kinetics, mechanism, isotherms, and thermodynamics of β-carotene were studied. The kinetic data were analyzed using the pseudo-first-order kinetic equation, pseudo-second-order kinetic equation, and intraparticle diffusion model. The pseudo-second-order kinetic model is the only one that describes the experimental data well (R2 ≥ 0.969). The chemical analysis of bulk clay showed that the predominant oxides are Al2O3 (57.91 wt%), Fe2O3 (32.54 wt%), SiO2 (3.09 wt%), K2O (2.37 wt%), and CaO2 (1.73 wt%). The adsorption capacity increases with an increase in temperature. The equilibrium data were described better by the Freundlich model for all clays. To determine the best fit kinetic model for each system, three error analysis methods, namely, chi-square (χ2), residual mean squared error (RMSE), and mean percent error (%APE) were used to evaluate the data. A thermodynamic study demonstrated that β-carotene adsorption is spontaneous, endothermic, and an entropy driven process for both forms of clay.

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S., Muzaffar Ali Andrabi, and Aziz Shabeela. "A study of kinetics of adsorption of lead and nickel ions on the sawdust of Cordia africana." Journal of Indian Chemical Society Vol. 87, Aug 2010 (2010): 963–66. https://doi.org/10.5281/zenodo.5801067.

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University Science Instrumentation Centre, P.G. Department of Chemistry, University of Kashmir, Srinagar-190 006, Jammu & Kashmir, India E-mail : smaa1@rediffmail.com Fax: 91-194-2421357 Manuscript received 12 October 2009. revised 21 January 2010, accepted 8 February 2010 The kinetics of adsorption of lead and nickel Ions on the sawdust of Cardia africana (lam tree) was studied at room temperature and rate constant of adsorption was determined. The pseudo-first order and pseudo-second order kinetic models were used to analyze the adsorption data. The results indicate that adsorption or lead and nickel ions on the sawdust or lam tree follow pseudo-first order kinetics. The interparticle diffusion constants were calculated and It was found that intraparticle diffusion may be the only rate controlling step.

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Kostoglou, Margaritis, and Thodoris D. Karapantsios. "Why Is the Linearized Form of Pseudo-Second Order Adsorption Kinetic Model So Successful in Fitting Batch Adsorption Experimental Data?" Colloids and Interfaces 6, no. 4 (2022): 55. http://dx.doi.org/10.3390/colloids6040055.

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There is a vast amount of literature devoted to experimental studies on adsorption from liquids examining the adsorption potential of various adsorbents with respect to various solutes. Most of these studies contain not only equilibrium but also kinetic experimental data. The standard procedure followed in the literature is to fit the kinetic experimental adsorption data to some models. Typically empirical models are employed for this purpose and among them, the pseudo-first and pseudo-second order kinetic models are the most extensively used. In particular, the linear form of their integrated equations is extensively employed. In most cases, it is found that the pseudo-second order model is not only better than other models but also leads to high fitting quality. This is rather strange since there is no physical justification for such a model, as it is well accepted that adsorption kinetics is dominated by a diffusion process. In the present work, it will be shown through examples and discussion that the success of the linearized pseudo-second order model in fitting the data is misleading. Specific suggestions on appropriate adsorption data treatment are given.

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Dang, Ming Yan, Hong Min Guo, and Yan Kun Tan. "Adsorption Kinetics of Zn(II) from Aqueous Solutions onto Epichlorohydrin Crosslinked Chitosan." Advanced Materials Research 463-464 (February 2012): 7–11. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.7.

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Chitosan was crosslinked using epichlorohydrin as crosslinking agent to prepare crosslinked chitosan which was used as an adsorbent for the removal of Zn(II) from aqueous solutions. The adsorption prosperities of Zn(II) on crosslinked chitosan were studied, including the influence of pH value and the adsorption kinetics. The kinetics of adsorption was discussed using two kinetic models, the pseudo first-order and the pseudo second-order model. Results reveal that the crosslinked chitosan is suitable as adsorbent to remove Zn(II) from dilute solution. The rate parameters for the Zn(II) by crosslinked chitosan were also determined. It was shown that the adsorption kinetics of Zn(II) could be best described by the pseudo second-order model and the adsorption process may involve a physical adsorption.

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Kong, Zhen Zhen, Dong Mei Jia, and Su Wen Cui. "Kinetics of Glyphosate Adsorption on Composite Resin from Aqueous Solution." Advanced Materials Research 803 (September 2013): 157–60. http://dx.doi.org/10.4028/www.scientific.net/amr.803.157.

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The composite weakly basic resin (D301Fe) was prepared and examined using scanning electron microscopy and Fourier transform infrared spectroscopy. The adsorption kinetics of glyphosate from aqueous solution onto composite weakly basic resin (D301Fe) were investigated under different conditions. The experimental data was analyzed using various adsorption kinetic models like pseudo-first order, the pseudo-second order, the Elovich and the parabolic diffusion models to determine the best-fit equation for the adsorption of glyphosate onto D301Fe. The results show that the pseudo-second order equation fitted the experimental data well and its adsorption was chemisorption-controlled.

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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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Abstract:

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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