ZHEN Shuang,DU Yucheng,WANG Jinshu,MA Yanlong,LI Yang,SHI Mohan,LIN Penghui

(Department of Materials and Manufacturing;Key Lab of Advanced Functional Materials,Ministry of Education, Beijing University of Technology,Beijing 100124,China)

Abstract:In order to improve adsorption efficiency of sepiolite for heavy metal ion As (V) in wastewater,nano rod-shaped sepiolite samples modified by hydroxyl iron oxide-manganese dioxide (FeOOH-MnO₂) were prepared by hydrothermal method with sepiolite as matrix,KMnO₄,MnCl₂ and FeCl₃ as metal source and urea as precipitant.The samples were characterized by XRD,SEM,TEM,BET and XPS and adsorption properties of As(V) were studied experimentally.The synthesis and adsorption mechanism of samples were discussed.The results show that FeOOH-MnO₂ is uniformly loaded on sepiolite fiber in the form of short rod.The maximum specific surface area of the sample can reach 77.4 m²/g.When pH is 7,the maximum adsorption capacity of As(V) is 124.3 mg/g at room temperatm.The adsorption of As(V) by sample is chemical adsorption,which follows Freundlich isothermal adsorption model.The adsorbent show good adsorption cycle performance because the removal rate of As(V) remains about 90% after the fifth cycle.

Keywords:hydroxyl iron oxide-manganese dioxide;sepiolite fiber;arsenic ion;adsorption performance

中图分类号：TU7                              文献标志码：A

文章编号：1008-5548(2022)04-0014-11

DOI:10.13732/j.issn.1008-5548.2022.04.002

收稿日期： 2022-01-06， 修回日期：2022-03-25，在线出版时间：2022-06-17。

基金项目：国家自然科学基金项目，编号：51974011；宁夏回族自治区重点研发计划项目，编号：2019BFG02032。

第一作者简介：甄 爽 (1996—)，女，硕士研究生，研究方向为功能材料。E-mail:1006862566@qq.com。

通信作者简介：杜玉成 (1963—)，男，教授，博士，硕士生导师，研究方向为环境功能材料、非金属矿物材料。E-mail:ychengdu@bjut.edu.cn。