Modelling, analysis and optimization of adsorption parameters for H3PO4 activated rubber wood sawdust using response surface methodology (RSM)
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Date
2009
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Abstract
Adsorption capacity of Cu2+ from aqueous solution onto H<inf>3</inf>PO<inf>4</inf> activated carbon using rubber wood sawdust (RSAC) was investigated in a batch system. Kinetic and isotherm studies were carried out, the thermodynamic parameters like standard Gibb's free energy (?G°), enthalpy (?H°) and entropy (?S°) were evaluated. The pseudo-second-order model was found to explain the kinetics of Cu2+ adsorption most effectively. The process optimization was performed through Central Composite Rotary Design using response surface methodology (RSM) by Design Expert Version 5.0.7 (STAT-EASE Inc., Minneapolis, USA). An initial concentration of 35 mg L-1, temperature of 26 °C, carbon loading of 0.45 g (100 mL)-1, adsorption time 208 min and pH of 6.5 was found to be the optimum conditions for the maximum uptake of copper ions of 5.6 mg g-1 in batch mode. © 2009 Elsevier B.V. All rights reserved.
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Keywords
Adsorption capacities, Adsorption parameters, Adsorption time, Aqueous solutions, Batch modes, Batch systems, Carbon loadings, Central composite rotary designs, Copper ions, HPO activated rubber wood sawdust, Initial concentrations, Minneapolis, Optimum conditions, Process optimizations, Pseudo-second order models, Response surface methodology, Thermodynamic parameters, Adsorption, Copper, Metal ions, Optimization, Rubber, Surface properties, Wood, Activated carbon, cupric ion, phosphoric acid, adsorption kinetics, article, mathematical model, parameter, pH measurement, pollution control, priority journal, response surface method, sawdust, thermodynamics, wood dust, Hydrogen-Ion Concentration, Ions, Kinetics, Models, Theoretical, Phosphates, Regression Analysis, Surface Properties, Temperature, Thermodynamics, Time Factors, Activated Carbon, Wood Properties
Citation
Colloids and Surfaces B: Biointerfaces, 2009, 70, 1, pp. 35-45