Bi-O-X基纳米材料的能带结构调控及其可见光催化降解尼泊金酯的机理研究

项目名称： Bi-O-X基纳米材料的能带结构调控及其可见光催化降解尼泊金酯的机理研究

项目编号： No.21477040

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 环境科学、安全科学

项目作者： 肖信

作者单位： 华南师范大学

项目金额： 45万元

中文摘要： 尼泊金酯被广泛用作防腐剂，但其残留在环境中表现出内分泌干扰活性，且易于生成毒害更大的氯化消毒副产物，已被认定为一类环境新兴污染物，必须尽快开发去除该类污染物的技术并考察其作用机制。光催化技术是解决该问题的有效途径之一，本申请在我们前期研究的基础上，提出通过调控Bi-O-X (X=F,Cl,Br,I)三元体系的能带结构，系统地研究催化剂结构、污染物结构与光催化活性之间的构效关系，合成出高效降解该类污染物的纳米可见光催化剂；并对反应过程中的活性氧化物种和降解中间产物进行识别，揭示催化剂结构与光生氧化物种、污染物降解中间物之间的内在联系，实现对降解路径的预测和调控，避免二次污染的发生。研究结果可望获得可见光条件下应用光催化技术处理该类污染物的解决方案，明确可见光催化活性与催化剂能带结构和污染物结构的关系，丰富光催化技术治理新兴污染物的基础理论和实验方法。

中文关键词： 可见光催化；尼泊金酯；Bi-O-X基纳米材料；构效关系；降解机理

英文摘要： Parabens, alkyl esters of 4-hydroxybenzoic acid, are extensively employed as preservatives in a wide range of cosmetics, canned foods, beverages and pharmaceuticals. These chemicals are continuously released in urban wastewater at relatively high levels and have been detected in variety of water samples. The main concern once they reach the environment is that they have proved to show oestrogenic activity. What's more, they can easily react with free chlorine when mixed with chlorinated tap water, yielding mono and dichlorinated derivatives. The resulting disinfection by-products have shown higher acute toxicity. Therefore, a good knowledge of the fate of parabens and their disinfection by-products from water is crucial for environmental protection. So far, researchers have tried to remove parabens from water by various techniques. Among them, the heterogeneous photocatalytic technologies have several advantages such as using solar light as energy source, high degradation efficiency, low cost, and ability to function under ambient conditions. However, to the best of our knowledge, the degradation of parabens and their chlorinated by-products under visible light irradiation has not been reported. By the band structure tuning of Bi-O-X (X = F, Cl, Br, and I) ternary system, a series of nano photocatalysts with dif

英文关键词： Visible-light Photocatalysis；Parabens；Bi-O-X based Nanomaterials；Structure-Activity Relationship；Reaction Mechanism