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Journal of Chemistry
Volume 2014 (2014), Article ID 450790, 7 pages
http://dx.doi.org/10.1155/2014/450790
Research Article

Adsorption of Arsenite by Six Submerged Plants from Nansi Lake, China

1School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan, Shandong 250101, China
2Center for Sustainable Development & Global Competitiveness, Stanford University, Stanford, CA 94305, USA

Received 24 April 2014; Revised 15 September 2014; Accepted 27 October 2014; Published 13 November 2014

Academic Editor: Davide Vione

Copyright © 2014 Zhibin Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nansi Lake is the largest and the most important freshwater lake in north China for the South-North Water Transfer Project. Due to long-time and large-scale fish farming of history, the excess fish food and excretion usually release pentavalent arsenic, which is converted into trivalent arsenic (As (III)) in the lake sediment and released into lake water. Adsorption of arsenite using six submerged plants (Mimulicalyx rosulatus, Potamogeton maackianus, Hydrilla, Watermifoil, Pteris vittata, and Potamogeton crispus) as adsorbing materials was investigated. The experimental data obtained have been analyzed using Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models and the pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetics models. According to the results, the As (III) equilibrium data agreed well with the Freundlich isotherm model. The adsorption capacity of the plants was in the following order: Potamogeton crispus > Pteris vittata > Potamogeton maackianus > Mimulicalyx rosulatus > Hydrilla > Watermifoil. The sorption system with the six submerged plants was better described by pseudo-second-order than by first-order kinetics. Moreover, the adsorption with Potamogeton crispus could follow intraparticle diffusion (IPD) model. The initial adsorption and rate of IPD using Potamogeton crispus and Pteris vittata were higher than those using other plants studied.