文献类型：期刊文献

英文题名：Effects of Copper, Lead, and Cadmium on the Sorption and Desorption of Atrazine onto and from Carbon Nanotubes

作者：Chen, Guang-Cai[1,2] Shan, Xiao-Quan[1] Wang, Yu-Sheng[1] Pei, Zhi-Guo[1] Shen, Xiu-E[1] Wen, Bei[1] Owens, Gary[3]

第一作者：Chen, Guang-Cai;陈光才

通信作者：Shan, XQ[1]

机构：[1]Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China;[2]Chinese Acad Forestry, Res Inst Subtrop Forestry, Fuyang 311400, Zhejiang, Peoples R China;[3]Univ S Australia, Ctr Environm Risk Assessment & Remediat, Mawson Lakes, SA 5095, Australia

年份：2008

卷号：42

期号：22

起止页码：8297-8302

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY

收录：;EI(收录号：20084811745558);Scopus(收录号：2-s2.0-56449094229);WOS:【SCI-EXPANDED(收录号:WOS:000260921400022)】；

基金：This work was funded by the National Natural Science Foundation of China (Grant: 20707037). The authors thank the Beijing Synchrotron Radiation Laboratory for assistance with the XAS study.

语种：英文

外文关键词：Cadmium - Copper - Herbicides - Hydration - Hydrogen bonds - Metal ions - Positive ions - Sorption - Yarn

摘要：There are currently few studies on the dual effects of metal ions on the sorption of atrazine and conversely of atrazine on metal adsorption on multiwalled carbon nanotubes (MWCNTs). While a number of sorption models were considered to describe the sorption of atrazine on MWCNTs, the Polanyi-Manes model (PMM) fit the sorption isotherms well with the lowest mean weighted square errors. Atrazine was mainly adsorbed onto the surface and micropores of MWCNTs bundles or aggregates. Hydrogen bonding between azo and amino nitrogen of atrazine and functional groups on MWCNTs also occurred. Oxygenated functionalities, mainly carboxylic groups on MWCNTs surface, decreased the sorption of atrazine. Metal cations Cu(2+), Pb(2+), and Cd(2+) diminished the sorption of atrazine depending on the oxygenated functionalities densities. The mechanisms ascribed were due to the formation of surface or inner-sphere complexes Of Cu(2+), Pb(2+), and Cd(2+) through carboxylic groups and hydration, which may occupy part of the surface of MWCNTs-O. The large hydration shell of metal cations may intrude or shield the hydrophobic and hydrophilic sites and indirectly compete with atrazine for surface sites, leading to the inhibition of atrazine adsorption around the metal-complexed moieties.