title: Kinetics and mechanism of arsenate removal by nanosized iron oxide-coated perlite.
abstract: This study discussed the adsorption kinetics of As(V) onto nanosized iron oxide-coated perlite. The effects of pH, initial concentration of As(V) and common anions on the adsorption efficiency were also investigated. It was observed that a 100% As(V) adsorption was achieved at pH value of 4-8 from the initial concentration containing 1.0 mg-As(V)L(-1) and the adsorption percentage depended on the initial concentration; the phosphate and silicate ions would not interfere with the adsorption efficiency. Furthermore, nanosized iron oxide-coated perlite (IOCP) has been shown to be an effective adsorbent for the removal of arsenate from water. The adsorption kinetics were studied using pseudo-first- and pseudo-second-order models, and the experimental data fitted well with the pseudo-second-order model. Moreover, it suggests that the Langmuir isotherm is more adequate than the Freundlich isotherm in simulating the adsorption isotherm of As(V). The adsorption rate constant is 44.84 L mg(-1) and the maximum adsorption capacity is 0.39 mg g(-1). These findings indicate that the adsorption property of IOCP gives the compound a great potential for applications in environmental remediation.
authors.affiliation: Institute of Environmental Science, University of Rajshahi, Rajshahi 6205, Bangladesh.
authors.forename: M G
authors.initials: MG
authors.lastname: Mostafa
authors.forename: Yen-Hua
authors.initials: YH
authors.lastname: Chen
authors.forename: Jiin-Shuh
authors.initials: JS
authors.lastname: Jean
authors.forename: Chia-Chuan
authors.initials: CC
authors.lastname: Liu
authors.forename: Yao-Chang
authors.initials: YC
authors.lastname: Lee
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D053768:Metal Nanoparticles; D008855:Microscopy, Electron, Scanning; D012822:Silicon Dioxide / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D005290:Ferric Compounds; C003076:Perlite; C000499:ferric oxide; D012822:Silicon Dioxide; D000537:Aluminum Oxide