王媛;兰豪;刘宗豪;李晓蕊;张瑞雪;黄家琰;

• 1:贵州大学资源与环境工程学院喀斯特地质资源与环境教育部重点实验室
• 2:贵州喀斯特环境生态系统教育部野外科学观测研究站

摘要(Abstract)：

采用溶胶凝胶法制备二氧化钛(TiO_2)薄膜光催化剂,比较不同初始质量浓度双酚A(BPA)在185 nm真空紫外光(VUV)下的降解和光催化降解。在此基础上,主要考察溶液初始pH值和水中常见阴离子对BPA真空紫外光催化降解的影响;通过自由基淬灭试验和对降解产物的分析推断可能的降解机理。结果表明,与VUV下BPA的降解相比,真空紫外光催化能显著促进高质量浓度BPA的降解。当初始质量浓度为100 mg/L时,BPA的真空紫外光催化降解速率常数是其在VUV下降解数率常数的1.65倍,其中光催化降解的贡献值可达39.4%。降解反应遵循准一级反应动力学规律。溶液初始pH值为6.19时,BPA降解最为迅速,pH值为3.54时次之,而pH值为9.30时降解最为缓慢。阴离子存在下,真空紫外光催化降解反应的准一级反应速率常数的变化趋势由大到小为k(NO_3^-)、k(CO_3-)、k(CO_3^(2-))、k(Cl(2-))、k(Cl^-)、k(SO_4-)、k(SO_4^(2-))、k(无)。羟基自由(·OH)是诱发BPA降解的主要活性物种,它与VUV一起作用于BPA分子,使其发生β断裂,进而得到降解。循环试验表明制备的TiO_2薄膜具有较好的稳定性和潜在的适用性。

关键词(KeyWords)： 环境工程学;TiO_2薄膜;双酚A;真空紫外光;光催化降解;降解途径

Abstract:

Keywords:

基金项目(Foundation): 贵州省留学人员科技活动择优资助项目((2018)0010)

作者(Authors): 王媛;兰豪;刘宗豪;李晓蕊;张瑞雪;黄家琰;

DOI: 10.13637/j.issn.1009-6094.2021.0225

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