The characteristics of degradation of atrazine before or after the addition of H2 O2 under visible irradiation were studied using anatase TiO2 and Fe3+ modified anatase TiO2 as photocatalysts and atrazine as model pollutant In the meantime, the reaction mechanisms of photocatalytic degradation of atrazine under visible light were preliminary studied. The results indicate that the degradation rate of atrazine could be increased with the exisience of H2O2 under visible irradiation. While when using Fe3+ modified anatase TiO2(Fe-A) as photocatalyst, the degradation ratio could be 98% after 1 h reaction, which was obviously higher than the effect of anatase TiO2. The reason forming such a result could be preliminary judged that the former relied on the O2- · which produced by the special structures formed by H2O2 absorbed on the surface of anatase TiO2 , while the latter was due to the photo-Fenton reaction occurred between Fe3+ and H2O2 under visible light so that it has a good result on degradation of atrazine.%以锐钛矿型TiO2(记为A)以及Fe3+改性后的锐钛矿型TiO2(记为Fe-A)为光催化剂,以内分泌干扰物莠去津为目标污染物,研究了H2O2加入前后对两种不同催化剂可见光催化降解莠去津的影响,及其可见光催化降解莠去津的反应机理.结果表明:在H2O2存在的条件下,锐钛矿型TiO2可见光催化降解莠去津的光催化性能有了一定的提高,而Fe3+改性过后的锐钛矿型TiO2可见光催化降解莠去津的性能却得到显著提高,反应1h,降解率便达到98％.形成这种结果的原因可以初步判定为前者是H2O2吸附于锐钛矿型TiO2表面形成特殊结构,产生的O2-·主要起氧化降解作用,而后者则由于其溶出的Fe3+与H2O2作用在可见光下发生光芬顿反应,进而对莠去津起到良好的降解效果.
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