文献类型：期刊文献

英文题名：Mechanisms of competitive adsorption of Pb, Cu, and Cd on peat

作者：Qin, Fei[1,2]; Wen, Bei[1]; Shan, Xiao-Quan[1]; Xie, Ya-Ning[3]; Liu, Tao[3]; Zhang, Shu-Zhen[1]; Khan, Shahamat U.[4]

第一作者：Qin, Fei;秦菲

通讯作者：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]Beijing Union Univ, Coll Art & Sci, Dept Biol, Beijing 100049, Peoples R China;[3]Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Lab, Beijing 100049, Peoples R China;[4]George Mason Univ, Dept Chem & Biochem, Fairfax, VA 22030 USA

第一机构：Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China

通讯机构：[1]corresponding author), Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Chem & Ecotoxicol, POB 2871, Beijing 100085, Peoples R China.

年份：2006

卷号：144

期号：2

起止页码：669-680

外文期刊名：ENVIRONMENTAL POLLUTION

收录：;EI(收录号：20063810116599);Scopus(收录号：2-s2.0-33748569830);WOS:【SCI-EXPANDED(收录号:WOS:000241574700037)】；

基金：Analysis of the XANES and EXAFS data on Cu(II) adsorbed on peat, Cu in reference compounds of Cu(OH) 2 , Cu(CH 3 CO 2 ) 2 and Cu(NO 3 ) 2 aqueous solution ( Fig. 4 b) suggests that the coordination environment of Cu(II) adsorbed on peat strongly resembles that of Cu(CH 3 CO 2 ) 2 , where Cu(II) was bonded primarily to carboxylic moieties. We can also suggest that probably Cu(II) was also bonded to phenolic group of peat, without excluding the hydroxyl groups. This conclusion is supported by the works of Alcacio et al. (2001) and by 13 C CPMAS NMR spin lattice relaxation rate measurements ( Schilling and Cooper, 2004 ).

语种：英文

外文关键词：peat; heavy metals; competitive adsorption; kinetics; X-ray absorption spectroscopy

摘要：Combined use of batch equilibration adsorption and X-ray absorption spectroscopy (XAS) was employed to study the mechanisms of competitive adsorption of Ph, Cu, and Cd on Danish and Heilongjiang peat in single- and multi-solute systems. The adsorption capacity and initial adsorption rate on the same peat in single-solute systems followed the order Ph > Cu > Cd. Both the adsorbed amount of each metal (q '(m)) and its initial adsorption rate were decreased in multi-solute systems. It was observed that the adsorbed amounts of metals at low-energy adsorption sites (q(m,l)) decreased pronouncedly compared to those at high-energy adsorption sites (q(m,2)), indicating that the competitive adsorption of Ph, Cu and Cd occurred mainly at the low-energy adsorption sites. XAS study revealed that both Ph and Cu were coordinated in peat predominantly to carboxylic moieties without excluding the hydroxyl groups, thereby providing an insight into the mechanism of competitive adsorption of Ph and Cu on peat. (c) 2006 Elsevier Ltd. All rights reserved.