Bi2WO6/石墨烯复合材料的制备与光催化应用研究进展  

Progress on the Preparation and Application in Photocatalysis of Bi2WO6/Graphene Composites

作　　者：任静 李秀艳[1,2] 辛王鹏 周国伟[1] REN Jing;LI Xiuyan;XIN Wangpeng;ZHOU Guowei(Key Laboratory of Fine Chemicals in Universities of Shandong,School of Chemistry and Pharmaceutical Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China;Shandong Peninsula Engineering Research Center of Comprehensive Brine Utilization,School of Chemical Engineering and Environment,Weifang University of Science and Technology,Weifang 262700,China)

机构地区：[1]齐鲁工业大学(山东省科学院)化学与制药工程学院,山东省高校轻工精细化学品重点实验室,济南250353 [2]潍坊科技学院化工与环境学院,山东半岛卤水资源高值化绿色化综合利用工程技术研发中心,潍坊262700

出　　处：《材料导报》2020年第5期1-7,共7页Materials Reports

基　　金：国家自然科学基金(51572124)~~

摘　　要：光催化太阳能转换被认为是解决日益严重的能源短缺和环境污染问题的有效途径。因此,探索一种具有优异光催化活性和良好循环性能的新型光催化剂对光催化技术的发展具有重要意义。Bi2WO6是最简单的Aurivillius型氧化物,是一种重要的n型半导体材料,具有优异的可见光响应光催化性能,有望应用于有机污染物的降解。然而,单组分Bi2WO6存在光生电子-空穴对复合效率高、可见光吸收能力不足等缺点,阻碍了其光催化性能的提高。将石墨烯、碳量子点、TiO2等其他材料与Bi2WO6复合,成为解决上述问题的一种有效办法。在众多选择中,石墨烯凭借优异的电化学性质而引起了极大的关注。石墨烯是一种由碳原子以sp 2杂化轨道组成的呈六角型蜂巢晶格的新型二维纳米材料,具有优良的导电性和光学性能。当石墨烯与Bi2WO6复合后,带来的性能提升主要有:(1)其优异的电子传导能力促进了电荷转移,抑制了光生电子-空穴对的重组;(2)基于石墨烯具有大的π共轭体系和二维平面结构,具有共轭体系的小分子或高分子污染物可通过π-π相互作用很容易地吸附在石墨烯表面上,这有利于催化反应的发生与进行;(3)石墨烯优良的光学性能可增强复合材料的可见光吸收。目前,用来制备Bi2WO6/石墨烯复合材料的方法主要有:水热法、溶剂热法、超声波化学合成法等。水热法经济实用,应用最为广泛。溶剂热法因能够利用非水介质的一些特性完成许多在水溶液条件下无法进行的反应而广受青睐。超声波化学合成法凭借独特的声空化效应,在近些年的研究中崭露头角。本文以Bi2WO6/石墨烯复合材料的制备方法为分类依据,将其分为水热法、溶剂热法、超声波化学合成法及其他制备方法四类,逐一进行分析、介绍,简述了复合材料的光催化增强机制,概述了复合材料在光催化领域的具体应用,并hotocatalytic solar energy conversion has been regarded as an effective approach to address the increasing energy shortage and environmental pollution issues.Therefore,it is imperative to explore novel photocatalysts owning preferable photocatalytic activity and excellent cyclic performance for the development of photocatalytic technologies.As one of the simplest Aurivillius type oxides,Bi 2WO 6 is an important n-type semiconductor material,which exhibits excellent visible-light response photocatalytic performance and has been highly desired for organic pollutants degradation under solar irradiation.However,bare Bi 2WO 6 has drawbacks of high recombination efficiency of photogenerated electron-hole pairs and limited visible light absorption ability,which hinder the enhancement of photocatalytic performance.To solve these problems,it is an effective solution to couple graphene,carbon quantum dots,TiO 2 and other materials with Bi 2WO 6.Graphene has recently attracted tremendous attention owing to its fascinating electrical and chemical properties.Graphene is a new type of two-dimensional nanomaterials with hexagonal honeycomb lattice composed of carbon atoms with sp 2 hybrid orbitals,which has excellent electrical and optical properties.The main performance improvements after Bi 2WO 6 coupled with graphene are as follows:i.The excellent electronic conductivity of graphene will promote the charge transfer through its conjugated structure,inhibiting the recombination of the photogenerated electron-hole pairs.ii.Based on the fact that graphene has a largeπ-conjugated bonding system and a two-dimensional plane structure,small molecules or high molecular pollutants with conjugated bonding systems can easily be adsorbed on the surface of graphene throughπ-πinteraction,which is beneficial to the catalytic reaction.iii.The excellent optical properties of graphene can enhance the visible-light absorption of the composites.At present,hydrothermal,solvothermal and ultrasonic chemical synthesis methods are the most common

关 键 词：Bi2WO6 石墨烯 复合材料 光催化 能源短缺 环境污染 

分 类 号：TB33[一般工业技术—材料科学与工程]