环境化学
杜艳艳,戴儒南,吴垚,兰叶青.酒石酸协同下TiO2光催化降解水中甲基橙[J].环境科学学报,2009,29(8):1707-1712
酒石酸协同下TiO2光催化降解水中甲基橙
- Photocatalytic degradation of methyl orange by TiO2 combined with tartaric acid
- 基金项目：国家自然科学基金项目(No.40671089)
- 作者
- 单位
- 杜艳艳
- 南京农业大学理学院, 南京 210095
- 戴儒南
- 南京农业大学理学院, 南京 210095
- 吴垚
- 南京农业大学理学院, 南京 210095
- 兰叶青
- 南京农业大学理学院, 南京 210095
- 摘要：实验研究了酒石酸协同下TiO2光催化降解水中甲基橙的作用机理及其影响因素.结果表明,紫外光照射下,酒石酸对TiO2降解甲基橙有显著的协同作用,其降解速率常数为单独TiO2作用时的10倍,是单独酒石酸作用时的180倍;溶液pH越低,甲基橙的降解速率越快;酒石酸初始浓度对甲基橙光催化降解速率也有明显的影响,酒石酸浓度越高,甲基橙的光催化降解速率越快,但当酒石酸浓度大于1mmol·L-1,甲基橙的降解速率增加缓慢,达2mmo
- Abstract：The mechanism and influence of photocatalytic degradation of methyl orange by tartaric acid and TiO2 were studied in aqueous solution. The results demonstrate that the degradation of methyl orange can be markedly accelerated by tartaric acid and TiO2 together under ultraviolet light irradiation. The rate constant is 10 times and 180 times,respectively,greater than those by TiO2 and tartaric acid alone. Lower pH results in much higher photocatalytic degradation of methyl orange. In addition,the degradation rate increases greatly with initial concentration of tartaric acid when it is ≤1 mmol·L-1,but the reaction rate reaches a peak when the initial concentration is ≥ 2 mmol·L-1.
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