水中2,4-二氯苯酚的光催化降解研究

以高压汞灯、紫外灯、氙灯和太阳光为光源,进行了ZnO、ZnS、TiO2及纳米TiO2对2,4-二氯苯酚溶液的光催化降解研究。结果表明,ZnO、ZnS、TiO2及纳米TiO2对2,4-二氯苯酚均有较强的光催化效果;在相同催化剂浓度下,以ZnO的催化效果最好,其次是TiO2;4种光源中以高压汞灯下的光解最快,太阳光次之;纳米TiO2对2,4-二氯苯酚的光催化降解属于一级动力学反应;曝气能加快2,4-二氯苯酚的光催化降解。

Photocatalytic Degradation of 2, 4 - dicholorophenai in Aqueous Solution

Photocatalytic degradation of 2,4-dicholorophenal by ZnO, ZnS, TiO2 and nanometer TiO2 was studied under high pressure mercury lamp, UV lamp, Xenon lamp and sunlight, respectively. The results showed that ZnO, ZnS, TiO2 and nanometer TiO2 exhibited significantly photocatalytic action on 2,4-dicholorophenal. When an identical concentration of photosensitizers was tested, the photocatalytic action of ZnO was the best and TiO2 ranked in the second. The photocatalytic action under the high pressure mercury lamp was better than sunlight and others. The reactions of photocatalytic degradation by nanometer TiO2 were first order reaction in kinetics. In addition, aeration can accelerate the photocatalytic degradation of 2,4-dicholorophenal.