文献类型：期刊文献

英文题名：Removal of phosphate anions using the modified chitosan beads: Adsorption kinetic, isotherm and mechanism studies

作者：Liu, Xin[1];Zhang, Lingfan[1,2]

机构：[1]E China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Res Ctr Anal & Test, Shanghai 200237, Peoples R China

年份：2015

卷号：277

起止页码：112

外文期刊名：POWDER TECHNOLOGY

收录：;EI(收录号：20151100647132);WOS:【SCI-EXPANDED(收录号:WOS:000353861100012)】；

基金：We are grateful for the financial support by the National Natural Science Foundation of China (Grant No. 21407050).

语种：英文

外文关键词：Chitosan; Phosphate; Adsorption; Kinetics; Isotherms

摘要：Anew chitosan biosorbent modified with zirconium ions (ZCB) was prepared and employed for the adsorption of phosphate ions from aqueous solution. Batch of experiments were performed to investigate the effects of various conditions on the phosphate adsorption, including contact time, the initial concentration of phosphate ions, temperature and pH. The experimental data were interpreted elaborately by the different models of adsorption kinetics and isotherms. The results showed that the kinetic data were well fitted to the pseudo first-order and second-order models, indicating that the adsorption behaviors were mainly ascribed to both physic-sorption and chemic-sorption. The further analysis of kinetics indicated that the intra-particle diffusion was the rate controlling process. The equilibrium data were best described by the Langmuir isotherm model with maximum monolayer adsorption capacity of 60.6 mg g(-1). The values of Delta G degrees, Delta S degrees and Delta H degrees revealed that the nature of adsorption was feasible, spontaneous and endothermic. FTIR, EDS, XPS and zeta potential studies suggested that the adsorption mechanism was possibly attributed to the electrostatic attraction and ion exchange reaction between ZCB and phosphate ions. (C) 2015 Elsevier B.V. All rights reserved.