玻璃纤维负载P25光催化接触氧化活性艳红X-3B

在玻璃纤维上焙烧P25制备了负载型TiO2光催化剂,探讨了焙烧温度对催化活性的影响,设计了光催化接触氧化反应器,并以活性艳红X-3B为模型污染物,考察溶液pH值、共存阴离子(CO₃^2-、SO₄^2-、Cl-)对光催化反应的影响.结果表明,焙烧温度直接影响负载后催化剂的活性,300℃负载时活性最高,SEM照片显示此时P25与载体结合牢固、负载颗粒均匀.酸性条件对活性艳红X-3B的降解有利,当溶液初始pH由2.0上升到10.0时,活性艳红X-3B的降解率从90.06%下降至42.71%.共存的CO₃^2-、SO₄^2-对活性艳红X-3B降解的影响不大,但Cl^-对氧化过程有明显的抑制,使活性艳红X-3B的降解率下降17.03%.利用成熟的光催化剂P25,通过烧结的方法制备负载型催化剂是当前替代粉末催化剂的较为可行的方案.

Photocatalytic Degradation of Reactive Red X-3B by Immobilized P25 in a Contact Oxidation Reactor

The immobilized photocatalyst, P25 supported by glass fiber, was prepared by calcining method. The effect of calcining temperature on the photocatalytic activity and the effect of initial pH and inorganic anions on the photocatalytic degradation of Reactive Red X-3B were explored in a new photocatalytic contact oxidation reactor. The results show that catalyst activity is affected drastically by calcining temperature, the optimal temperature is 300 ; the SEM photos of immobilized catalyst indicated that P25 adhered to glass fiber firmly; The Reactive Red X-3B was more easily degraded in acid solution, when initial pH increasing from 2.0 to 10.0, the degradation rate of Reactive Red X-3B decreased from 90.06% to 42.71%; inorganic anions, CO₃^2- and SO₄^2-, had little effect on the degradation of Reactive Red X-3B. However, the degradation of Reactive Red X-3B significantly decreased, 17.03% down, in the presence of Cl^-. So it was a good alternate scenario to conduct photocatalytic oxidation by using immobilized P25 in a contact oxidation reactor.