Visible Light-Induced Photodegradation of Simazine in Aqueous TiO2 Suspension

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• 作者：YongFang Rao ; Wei Chu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：September 25, 2013
• 年：2013
• 卷：52
• 期：38
• 页码：13580-13586
• 全文大小：390K
• 年卷期：v.52,no.38(September 25, 2013)
• ISSN：1520-5045

文摘

The degradation of simazine (SMZ) in TiO₂ suspension with the presence of H₂O₂ was investigated under the irradiation of 420 nm lamps. This process could be optimized by adjusting TiO₂ dosage, initial concentration of H₂O₂, and the initial pH of the solution. The optimum TiO₂ dosage was found to be 0.1 g/L, and the highest SMZ decay rate was achieved with the initial H₂O₂ concentration at 4 mM. Overdose of H₂O₂ is found to be more critical in jeopardizing the SMZ decay than the overdose of TiO₂. A neutral initial pH level at 6.5 was found to be favorable for SMZ degradation. The presence of Cr(VI) significantly accelerated SMZ degradation in the TiO₂/H₂O₂/vis (visible light) process. In addition, 10 simazine derivatives were identifed by liquid chromatography鈥搈ass spectrometry/mass spectrometry. It was suggested that dealkylation is the major pathway of SMZ photodecay in the TiO₂/H₂O₂/vis process. The final product was found to be ammeline.