title: Adsorption of indium(III) ions from aqueous solution using chitosan-coated bentonite beads.
abstract: Batch adsorption study was utilized in evaluating the potential suitability of chitosan-coated bentonite (CCB) as an adsorbent in the removal of indium ions from aqueous solution. The percentage (%) removal and adsorption capacity of indium(III) were examined as a function of solution pH, initial concentration, adsorbent dosage and temperature. The experimental data were fitted with several isotherm models, where the equilibrium data was best described by Langmuir isotherm. The mean energy (E) value was found in the range of 1-8kJ/mol, indicating that the governing type of adsorption of indium(III) onto CCB is essentially physical. Thermodynamic parameters, including Gibbs free energy, enthalpy, and entropy indicated that the indium(III) ions adsorption onto CCB was feasible, spontaneous and endothermic in the temperature range of 278-318K. The kinetics was evaluated utilizing the pseudo-first order and pseudo-second order model. The adsorption kinetics of indium(III) best fits the pseudo-second order (R(2)>0.99), which implies that chemical sorption as the rate-limiting step.
authors.affiliation: College of Engineering, Cagayan State University, Cagayan Valley 3500, Philippines; School of Graduate Studies, Mapua Institute of Technology, Manila 1800, Philippines.
authors.forename: Mary Jane C
authors.initials: MJ
authors.lastname: Calagui
authors.affiliation: School of Graduate Studies, Mapua Institute of Technology, Manila 1800, Philippines.
authors.forename: Delia B
authors.initials: DB
authors.lastname: Senoro
authors.affiliation: Institute of Hot Spring Industrial, Chia Nan University of Pharmacy and Science, Tainan 71710, Taiwan.
authors.forename: Chi-Chuan
authors.initials: CC
authors.lastname: Kan
authors.affiliation: School of Graduate Studies, Mapua Institute of Technology, Manila 1800, Philippines.
authors.forename: Jonathan W L
authors.initials: JW
authors.lastname: Salvacion
authors.affiliation: Operations Department, Frontier Oil Corporation, Makati City 1229, Philippines.
authors.forename: Cybelle Morales
authors.initials: CM
authors.lastname: Futalan
authors.affiliation: Department of Environmental Engineering and Science, Chia Nan University of Pharmacy and Science, Tainan 71710, Taiwan. Electronic address: peterwan@mail.chna.edu.tw.
authors.forename: Meng-Wei
authors.initials: MW
authors.lastname: Wan
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D002412:Cations; D048271:Chitosan / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007204:Indium / Q000032:analysis / Q000302:isolation & purification*; D008962:Models, Theoretical; D009566:Nitrates / Q000032:analysis / Q000302:isolation & purification*; D010316:Particle Size; D012996:Solutions; D013499:Surface Properties; D013696:Temperature; D062065:Wastewater / Q000737:chemistry; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D001546:Bentonite; D002412:Cations; D048271:Chitosan; D007204:Indium; D009566:Nitrates; D012996:Solutions; D062065:Wastewater; D014867:Water; D014874:Water Pollutants, Chemical; C089767:indium nitrate
keywords: Chitosan-coated bentonite beads; Indium; Isotherms; Kinetics