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Single, binary and ternary metal adsorption using acid‐treated Aegle marmelos Correa shell: kinetic, mechanistic and thermodynamic study
Author(s) -
Anandkumar J.,
Mandal B.
Publication year - 2012
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.1612
Subject(s) - adsorption , ternary operation , sorption , aqueous solution , chemistry , metal , kinetics , metal ions in aqueous solution , monolayer , langmuir adsorption model , nuclear chemistry , langmuir , inorganic chemistry , organic chemistry , biochemistry , physics , quantum mechanics , computer science , programming language
ABSTRACT In this study, adsorption of metals from aqueous solution using H 2 SO 4 ‐treated Aegle marmelos Correa shell (AMCS) was carried out in single and multimetal system. The maximum BET surface area (34.28 m 2 /g) and conspicuous change in the adsorbent surface were achieved when absolute concentration (98%) of acid was used to activate the AMCS. The sorption capacity of Pb 2+ , Ni 2+ and Sr 2+ was increased from 21.48 to 81.6 mg/g, 6.37 to 52.89 mg/g and 19.57 to 69.95 mg/g, respectively, as the H 2 SO 4 concentration increased from 24.5% to 98% to activate the AMCS. The maximum adsorption capacities of Pb 2+ , Ni 2+ and Sr 2+ were observed at pH 5.2 (82.9 mg/g), 5.8 (54.89 mg/g) and 6.8 (72.95 mg/g), respectively. Presence of other ions significantly reduces the metal uptake when they were present at high concentrations in the metal solution. The equilibrium data fitted satisfactorily with Langmuir model compared with other models. Monolayer sorption capacity was obtained as 122.7, 70.18 and 80.73 mg/g for Pb 2+ , Ni 2+ and Sr 2+ at 30 °C, respectively. The effect of binary and ternary metal ions on adsorption capacity was found to be antagonistic behavior. The sorption kinetics was found to follow the pseudo‐second‐order kinetic model. But, the positive values of Δ H ° and the increase in metal uptake with increase in solution temperature indicate the endothermic reaction for Ni 2+ adsorption. The intermolecular binding (ion–dipole) of Pb 2+ and Sr 2+ and intermolecular binding coupled with intramolecular binding of Ni 2+ were responsible for metal binding with cellulosic and lignin function groups. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd.