文献类型：期刊文献

英文题名：Fast removal of Co(ii) from aqueous solution using porous carboxymethyl chitosan beads and its adsorption mechanism

作者：Luo, Wenqiang[1];Bai, Zhishan[1];Zhu, Yong[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2018

卷号：8

期号：24

起止页码：13370

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20181605034111);WOS:【SCI-EXPANDED(收录号:WOS:000430018700039)】；

基金：This work was supported by the National Basic Research Program of China (973 Program, 2014CB748500), the National Natural Science Foundation of China (51406057, 51578239, and 51322805) and the Joint fund of the equipment pre Research Ministry of Education (6141A02033204).

语种：英文

外文关键词：Kinetics - Cobalt compounds - Crosslinking - Chitosan - Adsorption isotherms - Calcium chloride - Chemical analysis

摘要：Porous carboxymethyl chitosan (PCMC) beads were synthesized via ionic coacervation/chemical crosslinking, using polyethylene glycol (PEG) as a porogen and calcium chloride and glutaraldehyde as physical and chemical cross-linkers. The as-synthesized PCMC beads were characterized using SEM, EDS, BET, TGA, FTIR and XPS analysis and then tested for the removal of Co(ii) from aqueous solution. The effects of the initial pH, Co(ii) concentration and temperature were investigated. It was found that the adsorption equilibrium is reached within 6 h and the maximum adsorption capacity is 46.25 mg g(-1). In addition, the kinetics and equilibrium data are well described by pseudo-second-order kinetics and the Langmuir isotherm model. Moreover, the desorption and re-adsorption performance was also studied, and the results revealed that the prepared new adsorbent still showed good adsorption performance after five cycles of regeneration. Finally, the adsorption mechanism, including chemical and physical adsorption, was proposed on the basis of the microstructure analysis, adsorption kinetics and isotherm results, and chemical adsorption was found to be the main adsorption mechanism during the process of the removal of Co(ii).