钨酸铋的修饰改性及其可见光光催化降解水中溴代阻燃剂的研究

项目名称： 钨酸铋的修饰改性及其可见光光催化降解水中溴代阻燃剂的研究

项目编号： No.51308097

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 郭英娜

作者单位： 东北师范大学

项目金额： 25万元

中文摘要： 光催化技术可直接利用太阳光为激发源矿化分解水体中难降解有机污染物，是具有应用前景的水中有机污染物削减技术之一。然而，太阳能利用率低和太阳光光催化活性差是制约光催化技术实际应用的主要问题。本项目拟通过对钨酸铋修饰改性，开发新型高效二氧化钛替代型光催化材料，即采用溶剂热技术结合光沉积法制备贵金属沉积-铌或铋取代的钨酸铋异质结构光催化材料。通过较低价态过渡金属铌或铋的掺杂，在钨酸铋晶体内形成适量的氧空位，再结合贵金属纳米粒子的等离子共振效应，提高钨酸铋的量子效率并拓宽其可见光相应范围，实现提高钨酸铋总光催化效率的目标；以典型溴代阻燃剂为目标污染物，研究所制备的光催化材料的可见光光催化活性和稳定性，优化光催化反应的工艺操作条件，并通过光电化学手段、自由基和空穴捕获实验以及降解中间产物分析，提出改性的钨酸铋可见光光催化降解水中不同结构溴代阻燃剂的机理，为削减水中溴代阻燃剂提供高效可行的新技术。

中文关键词： 钨酸铋；贵金属；氧空位；可见光光催化；四溴双酚A

英文摘要： Photocatalytic technology is one of very promising environment purification technology because the sunlight can be directly used as the excitation source to decompose/mineralize organic pollutants in wastewater. However, the lower sunlight utilization efficiency and poor photocataltoc activity is still the "bottleneck" problems which inhibit its practical application. In this project, noble metals/Bi2MxW1-xO6 (M = Nb, Ti) heterostructured composite, one of new efficient photocatalytic materials replacing titanium dioxide, will be synthesized by a mild solvothermal treatment-photodeposition method. Doping the lower valence state of the metal, such as Nb5+, Ti4+ to substitute part of W6+, an appropriate amount of oxygen vacancies will be formed in the bismuth tungsten crystals; Combining with the surface plasmon resonance effect of the noble metal nanoparticals, the quantum efficiency of bismuth tungsten can be improved, and the corresponding visible-light absorption range can also be broaden; The goal of improving the photocatalytic efficiency of bismuth tungsten can be realized.Sevel typical brominated flame retardants (BFRs) are selected as the target pollutants, the photocatalytic activities and stabilitied of as-prepared photocatalytic composite are investigated under the visible-light irridiation; The op

英文关键词： Bismuth tungstate；Noble metal；Oxygen vacancy；visible-light photocatalysis；TBBPA