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Kinetic and isotherm studies of Cu(II) adsorption onto H3PO4-activated rubber wood sawdust.
J Colloid Interface Sci. 2005 Dec 15; 292(2):354-62.JC

Abstract

Adsorption of Cu(II) from aqueous solution onto H(3)PO(4)-activated carbon using rubber wood sawdust (RSAC) was investigated in a batch system. Kinetic and isotherm studies were carried out by considering the effects of various parameters, such as initial concentration, contact time, pH, and temperature. The optimal pH value for Cu(II) adsorption onto RSAC was found to be 6.0. Thermodynamic parameters such as standard Gibbs free energy (DeltaG(0)), standard enthalpy (DeltaH(0)), and standard entropy (DeltaS(0)) were evaluated by applying the Van't Hoff equation. The thermodynamics of Cu(II) adsorption onto RSAC indicates its spontaneous and exothermic nature. Langmuir, Freundlich, and Temkin isotherms were used to analyze the equilibrium data at different temperatures. The Langmuir isotherm fits the experimental data significantly better than the other isotherms. Adsorption kinetics data were tested using pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. Kinetic studies showed that the adsorption followed a pseudo-second-order reaction. The initial sorption rate, pseudo-first-order, pseudo-second-order, and intraparticle diffusion rate constants for different initial concentrations were evaluated and discussed. Adsorption mechanism studies revealed that the process was complex and followed both surface adsorption and particle diffusion. The rate-controlling parameter and effective diffusion coefficient were determined using the Reichenberg plot. It was found that the adsorption occurs through film diffusion at low concentrations and at higher concentration the particle diffusion becomes the rate-determining step.

Authors+Show Affiliations

Department of Chemical Engineering, Alagappa College of Technology, Anna University, Chennai 600 025, India.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16040040

Citation

Kalavathy, M Helen, et al. "Kinetic and Isotherm Studies of Cu(II) Adsorption Onto H3PO4-activated Rubber Wood Sawdust." Journal of Colloid and Interface Science, vol. 292, no. 2, 2005, pp. 354-62.
Kalavathy MH, Karthikeyan T, Rajgopal S, et al. Kinetic and isotherm studies of Cu(II) adsorption onto H3PO4-activated rubber wood sawdust. J Colloid Interface Sci. 2005;292(2):354-62.
Kalavathy, M. H., Karthikeyan, T., Rajgopal, S., & Miranda, L. R. (2005). Kinetic and isotherm studies of Cu(II) adsorption onto H3PO4-activated rubber wood sawdust. Journal of Colloid and Interface Science, 292(2), 354-62.
Kalavathy MH, et al. Kinetic and Isotherm Studies of Cu(II) Adsorption Onto H3PO4-activated Rubber Wood Sawdust. J Colloid Interface Sci. 2005 Dec 15;292(2):354-62. PubMed PMID: 16040040.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinetic and isotherm studies of Cu(II) adsorption onto H3PO4-activated rubber wood sawdust. AU - Kalavathy,M Helen, AU - Karthikeyan,T, AU - Rajgopal,S, AU - Miranda,Lima Rose, Y1 - 2005/07/22/ PY - 2005/03/02/received PY - 2005/05/25/revised PY - 2005/05/26/accepted PY - 2005/7/26/pubmed PY - 2006/12/9/medline PY - 2005/7/26/entrez SP - 354 EP - 62 JF - Journal of colloid and interface science JO - J Colloid Interface Sci VL - 292 IS - 2 N2 - Adsorption of Cu(II) from aqueous solution onto H(3)PO(4)-activated carbon using rubber wood sawdust (RSAC) was investigated in a batch system. Kinetic and isotherm studies were carried out by considering the effects of various parameters, such as initial concentration, contact time, pH, and temperature. The optimal pH value for Cu(II) adsorption onto RSAC was found to be 6.0. Thermodynamic parameters such as standard Gibbs free energy (DeltaG(0)), standard enthalpy (DeltaH(0)), and standard entropy (DeltaS(0)) were evaluated by applying the Van't Hoff equation. The thermodynamics of Cu(II) adsorption onto RSAC indicates its spontaneous and exothermic nature. Langmuir, Freundlich, and Temkin isotherms were used to analyze the equilibrium data at different temperatures. The Langmuir isotherm fits the experimental data significantly better than the other isotherms. Adsorption kinetics data were tested using pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. Kinetic studies showed that the adsorption followed a pseudo-second-order reaction. The initial sorption rate, pseudo-first-order, pseudo-second-order, and intraparticle diffusion rate constants for different initial concentrations were evaluated and discussed. Adsorption mechanism studies revealed that the process was complex and followed both surface adsorption and particle diffusion. The rate-controlling parameter and effective diffusion coefficient were determined using the Reichenberg plot. It was found that the adsorption occurs through film diffusion at low concentrations and at higher concentration the particle diffusion becomes the rate-determining step. SN - 0021-9797 UR - https://www.unboundmedicine.com/medline/citation/16040040/Kinetic_and_isotherm_studies_of_Cu_II__adsorption_onto_H3PO4_activated_rubber_wood_sawdust_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0021-9797(05)00649-1 DB - PRIME DP - Unbound Medicine ER -