Adsorption of Cd（II） on Zn-AI LDHs （Layered Double Hydroxides） Intercalated with Chelating Agents EDTA

作     者：Shuang Zhang Naoki Kano Hiroshi Imaizumi 

作者机构：Graduate School of Science and Technology Niigata Univ. Niigata Japan Dept. of Chem. and Chem. Eng. Fac. of Eng. Niigata Univ. Niigata Japan 

出 版 物：《Journal of Chemistry and Chemical Engineering》 (化学与化工（英文版）)

年 卷 期：2016年第10卷第2期

页      面：60-67页

学科分类：081704[工学-应用化学] 080703[工学-动力机械及工程] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 070302[理学-分析化学] 0703[理学-化学] 

主　　题：Layered Double Hydroxide EDTA cadmium adsorption kinetic. 

摘      要：The hydrotalcite-like compound [Zn2AI（OH）6]NO3-mH20 （shorted as ZnAI-NO3） was intercalated with the chelating agent EDTA （ethylene diamine tetraacetic acid） by anion exchange to uptake cadmium ion from aqueous solutions. The materials synthesized in this work were characterized by chemical analysis, FT-IR （fourier transform infrared spectroscopy）, XRD （X-ray powder diffraction） to confirm their properties. In order to investigate the optimum conditions for Cd（II） adsorption, the amount of Cd（ll） adsorbed by Zn-AI LDHs intercalated with EDTA （ZnAI-EDTA） under different conditions （i.e., adsorbent dosage, temperature and contact time） were determined by ICP-AES （inductively coupled plasma-atomic emission spectrometry）. Adsorption isotherms of Cd（II） onto ZnA1-EDTA were measured at varying initial Cd concentrations （0.05 mg/L to 1 mg/L） under optimized conditions. The data were applied to Langmuir and Freundlich isotherms model, and well fitted by the Freundlich isotherms model. The pseudo-second-order kinetic model was more adequate to describe the kinetic in this case.