Title: Adsorption kinetics of nitrate from aqueous solutions onto modified corn residue

Authors: Bao-yu Gao, Yu Wang, Qin-yan Yue, Xing Xu, Wen-wen Yue, Xiu-ming Xu

Addresses: School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, China. ' School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, China. ' School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, China. ' School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, China. ' School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, China. ' School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan, 250100 Shandong, China

Abstract: The adsorption kinetics of nitrate from aqueous solutions onto Modified Corn Residue (MCR) was studied. The Raw Corn Residue (RCR) was modified by epichlorohydrin in the presence of pyridine, and the adsorption kinetics was investigated in batch experiments. The results showed that the MCR adsorbs nitrate effectively, and the maximum adsorption capacities were 80.84 mg g−1 and 72.73 mg g−1 at 20°C and 40°C, respectively. The adsorption of nitrate under different initial concentrations all fit the first-order reaction. The adsorption rates were controlled by both membrane diffusion and intra-particle diffusion.

Keywords: nitrate; adsorption kinetics; intra-particle diffusion; diffusion modelling; first-order equation; MCR; modified corn residue; RCR; raw corn residue; epichlorohydrin; dimethylamine; Freundlich isotherm; adsorbent dose; agricultural residues; anionic adsorbents; water treatment; wastewater treatment.

DOI: 10.1504/IJEP.2011.039085

International Journal of Environment and Pollution, 2011 Vol.45 No.1/2/3, pp.58 - 68

Available online: 16 Mar 2011 *

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