HAN Yuxia^a, ZHANG Bin^b, ZHAO Siqin^a,b, SIN Asuha^a,b

(a. College of Chemical and Environmental Science; b. Inner Mongolia Key Laboratory of Functional Materials of Physics and Chemistry, Inner Mongolia Normal University, Hohhot 010022, China)

Abstract: TiO₂-coal-bearing kaolinite nanocomposites were synthesized by a hydrothermal method using coal-bearing kaolinite (CBK) and titanium sulfate as raw materials, and their adsorption abilities for organic dyes were investigated. The results show that the adsorption rate of methylene blue (MB) and Congo red (CR) reached 95.5% and 98.0% at C0=100 mg/L, V=20 mL, m=50 mg, and contact time=60 min, when the solution pH values are 12 and 7, respectively. After modification with TiO₂, the adsorption rate of MB and CR increased by 30% and 24% with respect to original CBK. The dye-adsorption kinetics fit well the pseudo-second order rate equation, while the adsorption isotherm data can best be described by Langmuir adsorption model.

Keywords: coal-bearing kaolinite; TiO₂-coal-bearing kaolinite nanocomposites; adsorption; methylene blue; congo red

中图分类号：TB332; O647.33

文献标志码：A

文章编号：1008-5548(2019)01-0021-07

DOI:10.13732/j.issn.1008-5548.2019.01.004

收稿日期： 2018-09-21，修回日期：2018-10-26，在线出版时间：2018-12-23 07:00。

基金项目：国家自然科学基金项目，编号：21267016。

第一作者简介：韩宇霞(1993—)，女，硕士研究生，研究方向为无机纳米材料及其应用。E-mail：m15848155259@163.com。

通信作者简介：长山(1959—)，男(蒙古族)，博士，教授，硕士生导师，研究方向为半导体光催化剂及纳米磁性材料。E-mail：asuha@imnu.edu.cn。