WANG Bingjia1, HE Manli2, CHEN Jiuyu1, ZHOU Xinhao1,TANG Anyu1, WANG Peng1, GONG Chunhui1, YANG Yi1
(1. School of Environmental and Biological Engineering; Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, Nanjing University of Science and Technology，Nanjing 210094, China; 2. Ministry of Basic, Army Engineering University of PLA, Nanjing 210001, China)
Abstract: In order to improve adsorption performance of cuprous oxide for U(VI) in wastewater, the octahedral Cu2O material was used as base material and zeolite zinc imidazole(ZIF-8) was attached to cuprous oxide(Cu2O) by microwave method to obtain a modified cuprous oxide composite zeolite zinc imidazole (Cu2O@ZIF-8) adsorbent. The modified materials were characterized by scanning electron microscopy and X-ray diffraction characterization. The adsorption mechanism was analyzed based on the sample characterization results before and after the U(VI) adsorption experiment. The results show that Cu2O@ZIF-8 prepared by microwave method has a particle size of about 3 μm and a regular and uniform morphology. ZIF-8 is uniformly attached to the regular octahedral Cu2O. U-Cu2O@ZIF-8 has spherical agglomerated particles with a particle size of about 200～800 nm after adsorbing uranyl ions. Adsorption capacity of Cu2O@ZIF-8 prepared can reach 115.5 mg/g. Adsorption speed is relatively fast and adsorption saturation can be reached within 10 hours. And the metal interference ion in environment has basically no effect on the adsorption U(VI) performance of Cu2O@ZIF-8.The adsorption of U(VI) by Cu2O@ZIF-8 involves physical adsorption and chemical adsorption. U(VI) in solution is adsorbed to surface by ZIF-8 and then transferred to Cu2O core. And a reduction reaction with Cu2O to reduce to U(IV) is happened, which realizes the reductive removal of U(VI).
Keywords: Cu2O@ZIF-8; microwave method; uranyl ion U(VI); adsorption performance; wastewater
中图分类号： X522
文献标志码：A
文章编号：1008-5548(2021)04-0008-08
DOI:10.13732/j.issn.1008-5548.2021.04.002
收稿日期： 2020-12-11， 修回日期：2021-03-22，在线出版时间：2021-06-04 15:09。
基金项目：国家自然科学基金项目，编号：11805101, 11205089；江苏省环保科研课题，编号：JSZCD 2018-044；江苏省凹土资源利用重点实验室开放课题，编号：HPK202001。
第一作者简介：王丙佳(1997—)，男，硕士研究生，研究方向为环境功能材料。E-mail： 1325443027@qq.com。
通信作者简介：杨毅(1973—)，男，博士，研究员，博士生导师，研究方向为环境功能材料。E-mail： yangyi@njust.edu.cn。
