Adsorptive Removal of Hg(II) Ions from Aqueous Solutions Using Chemical-Modified Peanut Hull Powder
Zhuhong Ding1, Rui Yu1, Xin Hu2, Yijun Chen2
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1School of Environment, Nanjing University of Technology,
200 Zhongshanbei Road, Nanjing 210009, P.R. China
2State Key Laboratory of Analytical Chemistry for Life Science,
Center of Material Analysis and School of Chemistry and Chemical Engineering,
20 Hankou Road, Nanjing University, Nanjing 210093, P.R. China
Pol. J. Environ. Stud. 2014;23(4):1115-1121
Peanut hull powders were chemically modified using mercaptoacetic acid to develop a convenient, lowcost, and highly efficient adsorbent for the removal of Hg(II) from aqueous solutions. A pseudo-second-order rate equation fitted the kinetic data better than a pseudo-first-order rate equation did for both the raw and the mercapto-modified peanut hull powder. The equilibrium data for both the raw and the mercapto-modified peanut hull powder fitted well with the Langmuir, Freundlich, and Temkin isotherm models. Mercapto-modification improved the adsorption capacity of Hg(II) onto peanut hull powder. Fourier-transform infrared spectra revealed that mercapto groups, together with hydroxyl and carboxyl groups, were the main function groups of Hg(II) biosorption onto chemical-modified peanut hull powder.
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