Enhanced photocatalytic activity of molecular imprinted nano α-Fe2O3 by hydrothermal synthesis using methylene blue as structure-directing agent

被引：21
作者：
Fang, Jimin [1 ]
Xu, Jingdan [1 ]
Chen, Junhong [1 ]
Huang, Xiuyan [1 ]
Wang, Xun [2 ]
机构：
[1] Wuhan Univ Technol, Coll Resources & Environm Engn, Wuhan 430070, Peoples R China
[2] Wuhan Univ Sci & Technol, Inst Urban Construct, Wuhan 430065, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2016年 / 508卷
基金：
中国国家自然科学基金;
关键词：
alpha-Fe2O3; Structure-directing agent; Methylene blue; Photocatalysis; Self-control; SELECTIVE DEGRADATION; WATER; NANOPARTICLES; EFFICIENT; HETEROJUNCTION; NANOCOMPOSITE; RESPONSIVITY; PERFORMANCE; COMPOSITES; ADSORPTION;
D O I：
10.1016/j.colsurfa.2016.08.048
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Molecularly imprinted nano alpha-Fe2O3 samples were prepared by hydrothermal synthesis using methylene blue as a structure-directing agent. The morphology, microstructure, surface complexation parameters, and surface bonding characteristics of the samples were characterized by XRD, TEM, BET, FTIR, and surface acid-base titration. The results indicates that the adsorption on the molecularly imprinted alpha-Fe2O3 followed a pseudo 2nd order kinetics, and its adsorption at equilibrium rises by 22% at pH = 7. Moreover, the adsorption of methylene blue on alpha-Fe2O3 was consistent with that of Freundlich isotherm model. Comparative investigation was also carried out to molecularly imprinted nano alpha-Fe2O3 between methylene blue and p-nitropbenol. Study of XPS revealed that the adsorption between alpha-Fe2O3 and methylene blue was thought to be a complexation adsorption. Photocatalytic results indicates that the alpha-Fe2O3 showed 168% (1.68 fold) and 45.8% enhancement in photocatalytic activities toward methylene blue and p-nitrophenol, respectively. Therefore, the nano alpha-Fe2O3 herein demonstrates strong characteristics of molecular imprinting. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：124 / 134
页数：11
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