Photocatalytic degradation of water contaminants using π-conjugated polymers

使用π-共轭聚合物光催化降解水污染物

• 批准号: 10680538
• 负责人: HASEGAWA Kiyoshi
• 金额: $ 2.05万
• 依托单位: Toyama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680538/
• 关键词: Agrochemicals; Visible light-induced photocatalytic degradtion; π-Conjugated polymer; Polyoctylthiophene film; Photosensitized reaction; Photo-Phenton reaction; Active oxygen species; Treatment of waste water; 光触媒; 光触媒反応

Visible light-induced photocatalytic degradation of iprobenfos pesticide using poly(3-octylthiophene-2,5-diyl) (POTh) film was studied. Addition of FeィイD12+ィエD1 to an aqueous solution of the pesticide and the use of the POTh film blend with sensitizers and/or radical scavengers promoted the degradation of iprobenfos. Active oxygen species formed on the POTh film and degradation mechanism of iprobenfos by the OH radical was also examined. Following results were obtained.1. An aqueous solution of Iprobenhos (10 ppm) was put into a test tube coated with POTh and the solution was irradiated under light of λ>380 nm by varying oxygen pressure of bubbling gas.2. The formation process of the active oxygen species (02・ィイD1-ィエD1 → HィイD22ィエD20ィイD22ィエD2 → OH) was elucidated.3. The acceleration of the degradation by FeィイD12+ィエD1 addition was explained by the increase in the concentration of the OH radical formed via the photo-Fenton reaction.3. Enhancement of the degradation rate and the stabilization of the film was accomplished by blending perylene (sensitizer) and N,N,N',N'-tetramethylbenzidine (cation scavenger) with the POTh film. The result can be explained by energy transfer and/or electron transfer from excited perylene (Per*) to POTh.4. The degradation path which the OH radical attacks on the benzene ring and the side group of iprobenfos was suggested.

以聚(3-辛基噻吩基-2，5-二基)(POTH)膜为催化剂，研究了可见光诱导光催化降解异丙硫磷农药。在农药水溶液中加入FeィイD12+ィエD1，并使用POTH膜与增敏剂和/或自由基清除剂混合使用，可促进异丙硫磷的降解。研究了POTH膜上生成的活性氧物种和异丙硫磷被羟基自由基降解的机理。取得了以下研究结果：1.将异丙苯硫磷的水溶液(10ppm)放入涂有POTH的试管中，在λ&gt；380 nm的光下，通过改变鼓泡气体的氧分压来照射溶液。阐明了活性氧物种(02·ィイD1-ィエD1→HィイD22ィエD20ィイD22ィエD2→OH)的形成过程。Fe-ィイD12+ィエD1的加入加速了降解，其原因是光-芬顿反应生成的OH自由基浓度增加。通过在POTH膜中加入增感增感剂和阳离子清除剂N，N，N‘，N’-四甲基联苯胺，提高了膜的降解率和稳定性。这一结果可以用激发态茂(PER*)向POTH4的能量转移和/或电子转移来解释。提出了羟基对异丙硫磷苯环和侧基的降解途径。