Kinetics and mechanism of arsenate removal by nanosized iron oxide-coated perlite

M. G. Mostafa, Yen Hua Chen, Jiin Shuh Jean, Chia Chuan Liu, Yao Chang Lee

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51 Citations (Scopus)

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 44.84Lmg-1 and the maximum adsorption capacity is 0.39mgg-1. These findings indicate that the adsorption property of IOCP gives the compound a great potential for applications in environmental remediation.

Original languageEnglish
Pages (from-to)89-95
Number of pages7
JournalJournal of Hazardous Materials
Volume187
Issue number1-3
DOIs
Publication statusPublished - 2011 Mar 15

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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