摘要
采用TiO_2对模拟废水中磺胺吡啶进行了光催化降解,探讨了各种因素对磺胺吡啶光催化降解效果的影响。结果表明:UV/TiO_2光催化降解模拟废水中磺胺吡啶时,最合适的水平组合是:TiO_2浓度为1g/L,磺胺吡啶浓度为10mg/L,在此条件下,磺胺吡啶的降解率高达99%;加入异丙醇和EDTA这两种掩蔽剂探究反应机理,表明在光催化反应中羟基氧化与空穴直接氧化是联合作用的,空穴的直接氧化是主要原因;将光催化结果进行动力学模型拟合,结果基本符合拟一级动力学模型。
The effects of various factors on degradation of low concentration SASP were studied using photocatalytic TiO_2 in synthetic wastewater. The results showed that when UV/TiO_2 photocatalytic degradated sulfasalazine in simulated wastewater, the most appropriate levels of combination was TiO_2 concentration of 1 g/L, sulfapyridine concentration of 10 mg/L. Under this condition, the degradation rate of sulfasalazine would be up to 99%. Adding two masking agents,isopropanol and EDTA,the reaction mechanism was explored, and the results showed that photocatalytic reaction was the combined effect of hydroxyl oxidation and the hole direct oxidation, direct oxidation of the hole was the main reason. Fitting photocatalytic results by kinetic model, results were consistent with the first-order kinetic model.
出处
《净水技术》
CAS
2018年第1期89-96,共8页
Water Purification Technology
