BixTiOy-TiO2复合膜电极光电催化去除模拟压载水中细菌

doi:10.3724/SP.J.1095.2014.30379

摘要/Abstract

摘要： 溶剂热-聚乙烯醇粘附法制备了钛网负载BixTiOy-TiO2复合膜电极。利用X射线衍射、紫外-可见漫反射、光致发光(PL)、扫描电子显微镜和能谱(EDS)等测试技术对合成的纳米材料和膜电极进行了表征。利用三电极系统对模拟压载水的灭菌效果进行实验研究。考察了外加电压、光源和膜电极的使用次数对光电催化灭菌效果的影响。 UV-Vis实验表明，BixTiOy-TiO2复合材料比纯TiO2有好的可见光吸收；PL实验证明，复合材料比纯TiO2有更高光量子效率。对细菌浓度为106 CFU/mL的模拟压载水的光电催化灭菌实验结果表明，外加电压为9 V，电极与溶液接触面积为140 cm2时，20 W紫外杀菌灯照射下反应2 min即可完全去除压载水中的细菌；聚乙烯醇粘附法制备的电极重复使用20次，灭菌效果不变。

关键词: BixTiOy-TiO2复合膜, 光电催化, 模拟压载水, 灭菌

Abstract: The BixTiOy-TiO2 composite film electrode was prepared using solvent thermal and adhesion method with polyvinyl alcohol. The as-prepared BixTiOy-TiO2 and film electrode were characterized by XRD, UV-Vis, photoluminescence(PL), SEM, and EDS. The bacteria in simulated ballast water was removed by photoelectrocatalysis. The effects of impressed voltage, light source and number of use of electrode on the disinfection efficiency of photoelectrocatalysis were investigated. UV-Vis experiments show that absorption of BixTiOy-TiO2 composite materials in visible light region is greater than that of pure TiO2. PL experiments prove that light quantum efficiency of composite materials is higher than that of pure TiO2. The photoelectric catalysis experiments of simulated ballast water containing 106 CFU/mL bacteria show that the sterilization efficiency reaches 100% under 20 W germicidal lamp irradiation for 2 min. The impressed voltage is 9 V and the electrode contact area with solution is 140 cm2. Sterilization efficiency remains the same when the same electrode is used repeatedly 20 times.

Key words: BixTiOy-TiO2 composite film, photoelectric catalysis, simulated ballast water, sterilization

中图分类号:

O643

张祖云, 刘媛, 蒋彩云, 王玉萍. Bi_xTiO_y-TiO₂复合膜电极光电催化去除模拟压载水中细菌[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.30379.

ZHANG Zuyun1, LIU Yuan1, JIANG Caiyun2, WANG Yuping1,3*. Photoelectrocatalytic Removal of Bacteria in Simulated Ballast Water Using Bi_xTiO_y-TiO₂ Composite Film Electrode[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30379.

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Bi_xTiO_y-TiO₂复合膜电极光电催化去除模拟压载水中细菌

Photoelectrocatalytic Removal of Bacteria in Simulated Ballast Water Using Bi_xTiO_y-TiO₂ Composite Film Electrode

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