TiO_(2)纳米颗粒在甲醇-水溶液中对3,4-二氯硝基苯的光催化性能  

Photocatalytic performance of TiO_(2) nanoparticles for 3,4-dichloronitrobenzene in methanol-aqueous solution

作　　者：费学宁 崔良福 申丛丛 张如冰 FEI Xuening;CUI Liangfu;SHEN Congcong;ZHANG Rubing(School of Science,Tianjin Chengjian University,Tianjin 300384,China;School of Environment and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Engineering Technology Center of Chemical Wastewater Source Reduction and Recycling,Tianjin 300384,China)

机构地区：[1]天津城建大学理学院,天津300384 [2]天津城建大学环境与市政工程学院,天津300384 [3]天津市化工废水源头减排与资源化工程技术中心,天津300384

出　　处：《环境工程学报》2021年第5期1509-1518,共10页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51778398)。

摘　　要：在紫外光照射下,考察了混合溶剂中甲醇和水的相对含量对二氧化钛(TiO_(2))催化3,4-二氯硝基苯性能的影响,对3,4-二氯硝基苯的降解率以及其还原产物(3,4-二氯苯胺)的产率进行了研究。结果表明:当V甲醇∶V水为5∶5时,在光催化反应前40 min内,3,4-二氯硝基苯的降解率可达26.81%;当V甲醇∶V水为9∶1时,在240 min内,3,4-二氯苯胺的产率最高为78%。根据氧化还原电势和羟基自由基(·OH)荧光检测的结果,推测了可能的光催化反应机制:混合溶剂中水量越高,越有利于氧化反应的进行;甲醇的含量较高,越有利于还原反应的进行。甲醇作为溶剂和空穴捕获剂可促进3,4-二氯硝基苯的还原反应,而水作为反应介质有利于·OH的生成,进而促进氧化反应。Under UV irradiation,the effects of the relative content of methanol and water in the mixed solvent on photocatalytic redox of 3,4-dichloronitrobenzene over titanium dioxide(TiO_(2))were investigated.Photocatalytic degradation efficiencies of 3,4-dichloronitrobenzene and yields of 3,4-dichloroaniline were measured.The results showed that the degradation efficiency reached 26.81%in the first 40 minutes of photocatalytic process when the volume ratio of methanol to water was 5∶5,while the yield of 3,4-dichloroaniline was the highest and reached 78%in 240 minutes of photocatalytic process when the volume ratio of methanol to water was 9∶1.The oxidation-reduction potential and hydroxyl radicals tests were used to reveal the photocatalytic mechanisms.High relative content of water in solvent was beneficial for oxidation,while high relative content of methanol in solvent was beneficial for reduction.As solvent of 3,4-dichloroaniline/3,4-dichloronitrobenzene and photogenerated hole scavenger,methanol could promote the reduction of 3,4-dichloronitrobenzene.As a reaction media,water was beneficial for hydroxyl radical production,and could promote the oxidation of 3,4-dichloronitrobenzene.

关 键 词：TIO2 3 4-二氯硝基苯 甲醇-水溶液 光催化反应 

分 类 号：X703[环境科学与工程—环境工程]