光照方式对光电催化降解有机污染物的影响  

Effects of illumination manners on the organic contaminants degradation in photoelectrocatalysis system

作　　者：王筱雯 王聪 李芬 胡晓玲 WANG Xiaowen;WANG Cong;LI Fen;HU Xiaoling(Central-southern Safety&Environment Technology Institute Co.,Ltd.,Wuhan 430051,China)

机构地区：[1]中南安全环境技术研究院股份有限公司,湖北武汉430051

出　　处：《能源环境保护》2022年第2期68-74,共7页Energy Environmental Protection

摘　　要：采用TiO_(2)/ITO光电极研究了不同光照方式对有机污染物光电催化降解的影响,通过光强测试解析了有机污染物物降解过程及有机污染物的空穴清除能力。结果表明:与正光照射相比,背光照射光电催化降解苯酚、腐植酸和酸性橙的速率分别提升了16.19%、26.09%和38.87%;正光照射时,光经过溶液导致的光强损失减弱了光阳极表面光照强度,从而降低了催化效率;背光照射对有机污染物降解效率提升的程度与有机污染物吸收光的能力呈正相关关系;由于背光照射避免了光经过溶液造成的光强损失,提高了空穴捕获能力,相较于没有污染物的条件产生了更大的光电流。The effects of illumination manners on the photocatalytic degradation of organic contaminants were studied with the TiO_(2)/ITO photoanode.The degradation process and the hole scavenging ability were analyzed by light intensity test.The results showed that the photocatalytic degradation rates of phenol,humic acid and acid orange under backside illumination increased by 16.19%,26.09%and 38.87%,respectively,compared with those under positive illumination.That was because the illumination intensity of positive illumination lost when the light passing through the solution,thus the illumination intensity on the surface of the photoanode reduced.The increased degradation rate of organic pollutants under backside illumination was positively correlated with the light adsorption ability of organic pollutants.The backside illumination improved the hole trapping ability by avoiding the illumination loss,resulting in a larger photocurrent compared with the condition without contaminants.

关 键 词：光电催化 TiO_(2) 正光照射 背光照射 难降解污染物 光强损失 

分 类 号：X703.1[环境科学与工程—环境工程]