Fixation of Heavy Metals onto Lignocellulosic Sorbent Prepared from Paddy Straw
Authors: Krishnani, K. K; Meng, Xiaoguang; Boddu, Veera M
Source: Water Environment Research, Volume 80, Number 11, November 2008 , pp. 2165-2174(10)
Publisher: Water Environment Federation
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Abstract:
The sorption behavior of biosorbent prepared from paddy straw with nine different heavy metals has been studied. The binding mechanisms involving adsorption and the cation-exchange process have also been investigated. Characterization of biosorbent through a scanning electron microscope revealed no major surface deformity resulting from the chemical treatment. X-ray photo electron spectroscopy was also used to determine the presence of exchangeable cations in the sorbent and the speciation of bound chromium, cadmium, and mercury. The maximum sorption capacity (millimoles/gram) obtained from the Langmuir model for Pb 2+, Cd 2+, Hg 2+, Co 2+, Ni 2+, Mn 2+, Zn 2+, and Cu 2+ were 0.286, 0.147, 0.226, 0.181, 0.196, 0.189, 0.219, and 0.248, respectively. Interpretation of <xref ref-type="bibr" rid="waer-80-11-Dahlquist1">Dahlquist (1978)</xref> and <xref ref-type="bibr" rid="waer-80-11-Scatchard1">Scatchard (1949)</xref> was also used for the binding site heterogeneity. The unique ability of the biosorbent to bind nine different metals has been attributed to the presence of surface heterogeneity and Ca 2+ ions, which attract and sequester metal ions. Biosorption results are useful for the development of low-cost biosorbent.Keywords: fixation; mechanism; heavy metals; paddy straw
Document Type: Research article
DOI: 10.2175/106143008X304785
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