TY - JOUR
T1 - Fixation of heavy metals onto lignocellulosic sorbent prepared from paddy straw
AU - Krishnani, K. K.
AU - Meng, Xiaoguang
AU - Boddu, Veera M.
PY - 2008/11
Y1 - 2008/11
N2 - 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 Pb2+, Cd2+, Hg2+, Co 2+, Ni2+, Mn2+, Zn2+, and Cu 2+ were 0.286, 0.147, 0.226, 0.181, 0.196, 0.189, 0.219, and 0.248, respectively. Interpretation of Dahlquist (1978) and Scatchard (1949) 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 Ca2+ ions, which attract and sequester metal ions. Biosorption results are useful for the development of low-cost biosorbent.
AB - 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 Pb2+, Cd2+, Hg2+, Co 2+, Ni2+, Mn2+, Zn2+, and Cu 2+ were 0.286, 0.147, 0.226, 0.181, 0.196, 0.189, 0.219, and 0.248, respectively. Interpretation of Dahlquist (1978) and Scatchard (1949) 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 Ca2+ ions, which attract and sequester metal ions. Biosorption results are useful for the development of low-cost biosorbent.
KW - Fixation
KW - Heavy metals
KW - Mechanism
KW - Paddy straw
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U2 - 10.2175/106143008X304785
DO - 10.2175/106143008X304785
M3 - Article
C2 - 19024732
AN - SCOPUS:55749096926
SN - 1061-4303
VL - 80
SP - 2165
EP - 2174
JO - Water Environment Research
JF - Water Environment Research
IS - 11
ER -