纳米TiO2/沸石复合材料光催化降解苯酚的性能

苯酚是一种较难处理的有毒有机污染物。本文以TiOSO₄为钛源,尿素为沉淀剂,沸石为载体,采用均匀沉淀法制备了纳米TiO₂/沸石复合材料,并以苯酚作为降解对象,研究了不同TiO₂负载量、煅烧温度以及重复使用对纳米TiO₂/沸石复合材料的光催化降解苯酚性能的影响。结果表明:TiO₂负载量为30%、煅烧晶化温度为650℃时,经300W高压汞灯照射3.5h,纳米TiO₂/沸石复合材料对20mg/L苯酚溶液的光催化降解率达到91.6%;重复使用5次仍对苯酚溶液具有85%的光催化降解率。

Photocatalytic degradation of phenol with nano-TiO2/zeolite composite material

Phenol is a toxic organic pollutants and difficult to treat. Using TiOSO₄ as titanium source, urea as the precipitator, and zeolite as the carrier, we had prepared the nano-TiO₂/zeolite material by homogeneous precipitation method. The effect of TiO₂ loading amount, calcination temperature and the reusabiity on photocatalytic degradation of phenol were investigated by taking phenol as the degradation target. The results showed that the nano-TiO₂/zeolite material with 30% TiO₂ loaded, and calcined at 650℃ exhibited the best photocatalytic performance. The degradation efficiency of nano-TiO₂/zeolite material towards phenol (20mg/L) was 91.6% when irradiated for 3.5h under 300W high pressure mercury lamp and the catalyst after five cycles still demonstrated excellent photocatalytic performance of 85 % of the photocatalytic degradation rate of phenol.