title: Modelling, analysis and optimization of adsorption parameters for H3PO4 activated rubber wood sawdust using response surface methodology (RSM).
abstract: Adsorption capacity of Cu(2+) 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, the thermodynamic parameters like standard Gibb's free energy (Delta G degrees), enthalpy (Delta H degrees) and entropy (DeltaS degrees) were evaluated. The pseudo-second-order model was found to explain the kinetics of Cu(2+) 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 degrees C, carbon loading of 0.45 g(100mL)(-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.
authors.affiliation: Department of Chemical Engineering, A.C. College of Technology, Anna University, Chennai 600025, India. helenkalavathy@gmail.com
authors.forename: Helen M
authors.initials: HM
authors.lastname: Kalavathy
authors.forename: Iyyaswami
authors.initials: I
authors.lastname: Regupathi
authors.forename: Magesh Ganesa
authors.initials: MG
authors.lastname: Pillai
authors.forename: Lima Rose
authors.initials: LR
authors.lastname: Miranda
mesh_terms: D000327:Adsorption; D003300:Copper / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D008962:Models, Theoretical; D010710:Phosphates / Q000737:chemistry*; D012044:Regression Analysis; D012408:Rubber / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors; D014934:Wood
chemical_list: D007477:Ions; D010710:Phosphates; D003300:Copper; D012408:Rubber