Selective removal of Cr(VI) from aqueous solution by adsorption on mangosteen peel

Kai Huang, Yifan Xiu, Hongmin Zhu

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Mangosteen peel, rich in polyphenolic compounds, was used to prepare the adsorbent exhibiting highly selective adsorption for Cr(VI) over other metal ions such as Pb2+, Fe3+, Zn2+, Cd2+, and Cr3+ at the pH values of 1∼4. The chemical modification method proposed by using calcium hydroxide is quite cost-effective and ecofriendly without using any toxic reagents or causing any secondary pollution. The adsorption isotherm results revealed that the adsorption of Cr(VI) on the gel fit well the Langmuir adsorption model, and the maximum adsorption capacity for Cr(VI) at pH levels 1, 2, 3, and 4 was evaluated to be 2.46, 2.44, 1.99, and 2.14 mol/kg, respectively. The adsorption mechanism for Cr(VI) on the saponified gel was verified to follow an esterifiaction reaction coupled with the reduction of Cr(VI) to Cr(III) in which H+ plays a role of promoter. Thus, modified mangosteen peel gel has the prominent selectivity and low cost for Cr(VI) removal.

Original languageEnglish
Pages (from-to)5930-5938
Number of pages9
JournalEnvironmental Science and Pollution Research
Volume20
Issue number9
DOIs
Publication statusPublished - 2013 Feb 11
Externally publishedYes

Keywords

  • Cr(VI)
  • Esterification
  • Mangosteen peel
  • Polyphenolic acids
  • Reduction
  • Selective adsorption

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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