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光催化过程中羟基自由基的产生与效能

Keywords: 光催化,异丙醇,羟基自由基,水处理

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Abstract:

采用异丙醇淬灭的方法考察了羟基自由基在光催化氧化酸性橙Ⅱ过程中的产生和效能,研究了TiO2(P-25)的浓度、异丙醇的用量、酸性橙Ⅱ的初始浓度、初始pH条件和天然共存离子对羟基自由基贡献率的影响。结果表明,在TiO2(P-25)浓度提高时羟基自由基的贡献率逐步提高并稳定在77.6%,异丙醇的投加量对羟基自由基的贡献率影响不大,酸性橙Ⅱ初始浓度的提高则使羟基自由基的贡献率降低。在中性pH条件下羟基自由基的贡献率最高,酸性或碱性条件下较低。天然共存离子中HCO3-对羟基自由基的淬灭效应最强,F-的淬灭效应最弱。

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