文献类型：期刊文献

英文题名：Adsorption of diuron and dichlobenil on multiwalled carbon nanotubes as affected by lead

作者：Chen, Guang-Cai[1,2] Shan, Xiao-Quan[1] Pei, Zhi-Guo[1] Wang, Huanhua[1] Zheng, Li-Rong[3] Zhang, Jing[3] Xie, Ya-Ning[3]

第一作者：陈光才;Chen, Guang-Cai

通信作者：Shan, XQ[1]

机构：[1]Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China;[2]Chinese Acad Forestry, Res Inst Subtrop Forestry, Fuyang 311400, Zhejiang, Peoples R China;[3]Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Lab, Beijing 100049, Peoples R China

年份：2011

卷号：188

期号：1-3

起止页码：156-163

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20111113747375);Scopus(收录号：2-s2.0-79952484396);WOS:【SCI-EXPANDED(收录号:WOS:000289334300022)】；

基金：This work was funded by the National Natural Science Foundation of China (grant number: 41071308). Dr. Weng Shifu, College of Chemistry and Molecular Engineering, Peking University, was highly appreciated for his constructive discussion on FTIR data.

语种：英文

外文关键词：Diuron; Dichlobenil; Lead; Carbon nanotubes; Adsorption

摘要：The effect of lead on the adsorption of diuron and dichlobenil on multiwalled carbon nanotubes (MWCNTs) was investigated to explore the possible application of MWCNTs for removal of both herbicides from contaminated water. The adsorption of diuron and dichlobenil on MWCNTs at pH 6 was nonlinear and fit the Polanyi-Manes model well. The adsorption of diuron and dichlobenil was closely correlated with specific surface areas and micropore volumes of MWCNTs. An increase in oxygen content of MWCNTs with same diameters and similar surface areas decreased the adsorption of diuron and dichlobenil, while increased the adsorption of lead. Micro-Fourier transform infrared spectroscopic study indicated that hydrogen bonding is a main mechanism responsible for the adsorption of diuron or dichlobenil onto MWCNTs-O. Oxygen containing groups, mainly carboxylic groups, significantly increased the adsorption of lead through the formations of outer-sphere and inner-sphere complexes, which are verified by X-ray absorption spectroscopic measurements. Oxygen containing groups and the presence of lead diminished the adsorption of diuron and dichlobenil. The suppression mechanisms of lead were ascribed to hydration and complexation of lead with carboxylic groups, which may occupy part of surface of MWCNTs-O. The large hydration shell of lead cations may intrude or shield hydrophobic and hydrophilic sites, resulting in a decreased adsorption of diuron and dichlobenil at the lead-complexed moieties. (C) 2011 Elsevier B.V. All rights reserved.