Biosorption mechanism of nine different heavy metals onto biomatrix from rice husk

Kishore K. Krishnani, Xiaoguang Meng, C. Christodoulatos, Veera M. Boddu

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530 Scopus citations

Abstract

A biomatrix was prepared from rice husk, a lignocellulosic waste from agro-industry, for the removal of several heavy metals as a function of pH and metal concentrations in single and mixed solutions. The biomatrix was characterized using scanning electron microscope and Fourier transform infrared spectroscopy, which indicated the presence of several functional groups for binding metal ions. Different experimental approaches were applied to show mechanistic aspects, especially the role of calcium and magnesium present in the biomatrix in ion exchange mechanism. The ultimate maximum adsorption capacity obtained from the Langmuir isotherm increases in the order (mmol/g): Ni (0.094), Zn (0.124), Cd (0.149), Mn (0.151), Co (0.162), Cu (0.172), Hg (0.18) and Pb (0.28). The sorption of Cr(III) onto biomatrix at pH 2 was 1.0 mmol/g. Speciation of chromium, cadmium and mercury loaded on the biomatrix was determined by X-ray photoelectron spectroscopy. The biomatrix has adsorption capacity comparable or greater to other reported sorbents.

Original languageEnglish
Pages (from-to)1222-1234
Number of pages13
JournalJournal of Hazardous Materials
Volume153
Issue number3
DOIs
StatePublished - 30 May 2008

Keywords

  • Biomatrix
  • Heavy metals
  • Removal mechanism

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