文献类型：期刊文献

英文题名：Cadmium adsorption by willow root: the role of cell walls and their subfractions

作者：Chen, Guangcai[1] Liu, Yongqing[1,2] Wang, Renmin[2] Zhang, Jianfeng[1] Owens, Gary[3]

第一作者：陈光才

通信作者：Chen, GC[1]|[a000551c9abd7c3960d59]陈光才;

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Fuyang 311400, Zhejiang, Peoples R China;[2]Zhejiang Univ, Coll Agr & Biotechnol, Hangzhou 310029, Zhejiang, Peoples R China;[3]Univ S Australia, Mawson Inst, Mawson Lakes, SA 5095, Australia

年份：2013

卷号：20

期号：8

起止页码：5665-5672

外文期刊名：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录：;Scopus(收录号：2-s2.0-84880628024);WOS:【SCI-EXPANDED(收录号:WOS:000321908600055)】；

基金：This work was jointly supported by the Special Fund for Forestry Scientific Research in the Public Interest, People's Republic of China (201104055), and the Research Institute of Subtropical Forestry, Chinese Academy of Forestry (RISF 6803).

语种：英文

外文关键词：Willow; Root cell walls; Adsorption; Cd

摘要：Plant cell walls may play an important role in the uptake and accumulation of heavy metals. This study was undertaken to obtain a better understanding of the role of the root cell walls (RCW) and their subfractions on adsorption of cadmium (Cd) in a promising woody phytoremediation species, Salix jiangsuensis J172. In order to examine how Cd binding was affected by pectin and hemicellulose, RCW were isolated and sequentially fractioned by removing pectin (RCW1), partial removal of hemicellulose (RCW2), and complete removal of hemicellulose (RCW3). The RCW and fractions were characterized by Fourier transform infrared spectroscopy, which suggested decomposition of hemicellulose and a decline in nitrogen content following cell wall isolation and fractionation. The adsorption affinity of Cd increased gradually following the sequential extraction of root cells, suggesting that hemicellulose negatively impacted Cd adsorption, while pectin and cellulose enhanced Cd adsorption. Cd adsorption dynamics and isotherms could be best described by the pseudo-second-order (R > 0.99) and Freundlich (R > 0.97) models, respectively. Thermodynamic properties (a dagger G, a dagger H, and a dagger S), determined using the van't Hoff equation, indicated that while Cd adsorption was endothermic, and spontaneous for RCW2 and RCW3, adsorption was not spontaneous for the root, RCW, and RCW1. The results provide evidence for the importance of the root cell walls in the adsorption of Cd by willow roots.