负载型TiO2固定相光催化氧化法降解水中呋码唑酮

以高压汞灯为光源、负载在海砂上的ＴｉＯ２为催化剂，采用敞口固定床型光催化反应器对水中难降解的呋码唑酮（ＦＴＤ）进行了固定相光催化氧化实验。结果表明，反应速率可用ＬａｎｇｍｕｉｒＨｉｎｓｈｅｌｗｏｏｄ方程描述，与光分解相比，光催化氧化的突出优点是矿化程度高，相同光辐射条件下反应１００ｍｉｎ，０．１０ｍｍｏｌ／Ｌ的ＦＴＤ水溶液经光催化氧化后ＴＯＣ的去除率为８９．１％，而经光分解后ＴＯＣ的去除率仅为２８．８％；在反应体系中投加少量臭氧或过氧化氢可以显著提高ＦＴＤ的氧化效率，说明光催化氧化可以兼容Ｏ３／ＵＶ、Ｈ２Ｏ２／ＵＶ等光激发氧化工艺。制得的负载型ＴｉＯ２具有较高的机械强度和化学稳定性，可重复利用。探讨了充氧、ＦＴＤ浓度及ｐＨ值等对光催化氧化过程的影响。

Immobilized photocatalytic oxidation of furaltadone in aqueous solution.

Immobilized photocatalytic oxidation of furaltadone (FTD) was investigated in an open fixed bed photoreactor illuminated with a 125W high pressure mercury lamp and using supported TiO 2 coated sand as catalyst. It was found that photocatalytic oxidation has considerably more effective on the removal of TOC in FTD solution than photolysis under the same illumination condition. After 100 min of photocatalytic oxidation, 91.7% of FTD in a 0.10mmol/L aqueous solution was degraded and 89.1% of TOC was removed. With photolysis alone, 79.4% of FTD was degraded and only 28.8% of TOC was removed in the same period. The rate of photocatalytic oxidation can be expressed by the Langmuir Hinshelwood Equation.When small amount of either ozone or hydrogen peroxide was added to this system, the degradation was enhanced significantly.This results suggest that the method can be compatible with other Advanced Oxidation Processes(AOPs) such as O 3/UV or H 2O 2/UV method where UV light is also applied.The effects of bubbling with pure oxygen, initial concentration and pH were also studied. Moreover, the supported TiO 2 catalytic material is very stable mechanically and chemically, and can be re used.