文献类型：期刊文献

英文题名：Effective removal of hexavalent chromium from aqueous solutions by adsorption on mesoporous carbon microspheres

作者：Zhou, Jianguo[1];Wang, Yuefeng[1];Wang, Jitong[1];Qiao, Wenming[1];Long, Donghui[1];Ling, Licheng[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2016

卷号：462

起止页码：200

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20154101378410);WOS:【SCI-EXPANDED(收录号:WOS:000365143700022)】；

基金：This work was partly supported by MOST (2014CB239702) and National Science Foundation of China (Nos. 51302083, 51172071, 51272077), and Fundamental Research Funds for the Central Universities and Shanghai Raising Star Program.

语种：英文

外文关键词：Hexavalent chromium removal; Adsorption; Mesoporous carbon microspheres; Magnetic separation

摘要：High-surface-area mesoporous carbon microspheres were successfully synthesized by a spraying method with the purpose of removing Cr(VI) from waste water. Various factors influencing the adsorption of Cr(VI), including pH, adsorption temperature, and contact time were studied. As the adsorption process was pH dependent, it showed maximum removal efficiency of Cr(VI) at pH 3.0. Pseudo-second-order model was found to best represent the kinetics of Cr(VI) adsorption. The adsorption parameters were determined using both Langmuir and Freundlich isotherm models, and Q(m) value was as high as 165.3 mg/g. The thermodynamic parameters including standard Gibb's free energy (Delta G(0)), standard enthalpy (Delta H-0) and standard entropy (Delta S-0) were investigated for predicting the nature of adsorption, which suggested the adsorption was an endothermic and a spontaneous thermodynamically process. Furthermore, Fe3O4-loaded MCMs were prepared to rapidly separate the adsorbent from the solution by a simple magnetic process. Fe3O4-loaded MCMs had a high adsorption capacity of 156.3 mg/g, and a good regeneration ability with a capacity of 123.9 mg/g for the fifth adsorption-desorption cycle. (C) 2015 Elsevier Inc. All rights reserved.