文献类型：期刊文献

英文题名：Study on the competitive adsorption and correlational mechanism for heavy metal ions using the carboxylated magnetic iron oxide nanoparticles (MNPs-COOH) as efficient adsorbents

作者：Xu, Hao[2];Yuan, Hengfeng[3];Yu, Jianguo[1,2];Lin, Sen[1,2,4]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[3]Fudan Univ, Dept Orthoped, Zhongshan Hosp, Shanghai 200032, Peoples R China;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2019

卷号：473

起止页码：960

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20185306322091);WOS:【SCI-EXPANDED(收录号:WOS:000456951700119)】；

基金：This work was supported by National Natural Science Foundation of China (51704121) and the Fundamental Research Funds for the Central Universities (222201714038).

语种：英文

外文关键词：Magnetic nanoparticle; Carboxylation; Competitive adsorption; Desorption; Adsorption mechanism; Inner-sphere complexation

摘要：In this study, carboxylated magnetic iron oxide nanoparticles (MNPs-COOH) with well-formed nanostructure and magnetic recoverability were prepared successfully via a simple grafting method, and their adsorption competitiveness and differences for different heavy metal ions were generally explored both in single and mixed systems. The results showed that the Cd2+ adsorption demonstrated the strongest resistivity to the effects from exogenous factors with the tightest binding with the carboxyl groups on the MNPs-COOH surface. Besides, the competitive adsorption and multicomponent desorption experiments reflected that the affinity and adsorption priority of the as-synthesized MNPs-COOH for different heavy metal ions were hierarchical and followed the rank of Cd2+ > Cu2+ > Pb2+ > Ni2+, resulting from the disparity of the proportion and intensity of the inner-sphere complexation between heavy metals and the MNPs-COOH. It is hoped that our work could offer effective guidance for the MNPs-COOH application in the wastewater treatments involving various heavy metal contaminants in the future.