WANG Pengrui1,2, YANG Dan1, ZHANG Xue1, LI Jing1, YAN Liangguo1
(1. School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China;2. Jinan Shizhong Environmental Monitoring Station, Jinan 250001, China)
Abstract: To obtain layered double hydroxide (LDH) based functional materials for efficient removal hexavalent chromium (Cr(VI)) from water, CaAl-LDH and FeAl-LDH were prepared by the hydrothermal method. The structure and property were investigated by X-ray diffraction pattern (XRD), Fourier transform infrared spectroscopy, scanning electron microscopy and specific surface area measurement. Batch equilibrium experiments were used to evaluate the adsorption performance of the as-prepared CaAl-LDH and FeAl-LDH for aqueous Cr(VI). The experimental results show that CaAl-LDH and FeAl-LDH have typical XRD peaks of LDH, mesoporous structure and hexagonal laminar shape. The specific surface areas are 8.746 and 159.5 m2/g. The adsorption processes of Cr(VI) by CaAl-LDH and FeAl-LDH are fast and reache equilibrium within 30 min, andare not affected by the initial solution pH value and the common coexisting anions. The kinetic and isothermal data follow the pseudo-second-order kinetic equation and the Langmuir model, respectively. The maximum adsorption capacities of CaAl-LDH and FeAl-LDH for aqueous Cr(VI) are 34.92 and 51.31 g/kg.
Keywords: CaAl-LDH; FeAl-LDH; hexavalent chromium; adsorption; hydrothermal method
中图分类号：X52
文献标志码：A
文章编号：1008-5548(2021)03-0059-09
DOI:10.13732/j.issn.1008-5548.2021.03.008
收稿日期： 2020-12-27，修回日期：2021-02-22，在线出版时间：2021-04-07 11:27。
基金项目：国家自然科学基金项目，编号：21577048。
第一作者简介：王鹏瑞(1990—)，男，硕士研究生，研究方向为环境监测与水污染治理技术。E-mail：502276827@qq.com。
通信作者简介：闫良国(1971—)，男，博士，教授，博士生导师，研究方向为环境功能材料。E-mail：chm_yanlg@ujn.edu.cn。
