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环境化学  2015 

TiO2光催化降解乙酰甲胺磷

Keywords: 乙酰甲胺磷,二氧化钛,光催化

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Abstract:

在TiO3悬浮体系中,利用光催化技术消除乙酰甲胺磷(DMAPT).探索了催化剂用量和目标物浓度对消除速率的影响.结果表明,催化剂的最佳用量为4g·l-1,DMAPT的光催化降解规律符合L-H模型,吸附常数和反应速率参数分别为2mmol-1·l和0.6mmol·l-1·min-1.反应中主要的活性物种为·OH.反应的主要中间产物和矿化产物有O,S-二甲基硫代磷酰胺酯,O,O',S-三甲基硫代磷酸酯和磷酸甲酯等.DMAPT的降解从C—N键的断裂开始,随后经过P—N,P—S,P—C键的氧化分解,生成低毒和无毒的中间产物,并随着反应的继续最终达到彻底矿化,最终产物为SO42-,NO3-,PO43-和CO3.

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