以活性艳红X-3B及苯酚作模型污染物,研究催化剂晶型(锐钛矿和金红石)及H2O2对TiO2可见光催化性能的影响,并研究Fe3+在这一反应体系中的协同效应.结果表明:在H2O2存在条件下,锐钛矿和金红石TiO2均能可见光催化降解活性艳红X-3B,且TOC的去除率达65％,反应并不限于发色基团的破坏,但当TiO2的吸附点位吸附CO32-达到饱和后,则对活性艳红X-3B基本无降解效果;TiO2能可见光催化H2O2降解苯酚,金红石TiO2显示出较锐钛矿TiO2更高的催化活性,反应120 min后,对苯酚的降解率达80％,且反应体系生成的环状中间产物的浓度明显较锐钛矿TiO2的高；以Fe3+协同TiO2可见光催化H2O2降解苯酚时,反应效率显著加快,经20 min反应,对苯酚的降解率可达100％,而金红石TiO2显示更为明显的协同效应.%The effects of crystalline structure (anatase and rutile) and H2O2 on TiO2 visible-light photocatalysis were studied, and the synergistic effect of Fe3+ in the reaction system was also studied using the reactive red X-3B and phenol as model pollutants. The results indicate that reactive brilliant red X-3B can be photocatalytic degradated by anatase or rutile TiO2 under visible-irradiation with H2O2 addition, the TOC removal rate can reach 65%, and the degradation process is not limited to the broke down of chromophore groups, however, when the surface sites of TiO2 photocatalyst (anatase or rutile) is preeminently occupied by CO32-, the photodecomposition of reactive brilliant red X-3B can not be processed. The phenol can be degradated with H2O2 catalyzed by TiO2 visible-light photocatalysis, the rutile form exhibit a better photocatalytic activity, its degradation rate can reach 80% after 120 min reaction, and the concentration of the ring intermediates detected during phenol decomposition is evidently higher when using rutile TiO2 as photocatalyst. The snergistic degradation of phenol with H2O2 photo-catalyzed by TiO2 and Fe3+ is evidently fast, the degradation rate of phenol can reach 100% after 20 min reaction, and rutile TiO2 show more evident synergistic effect.
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