【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2mmol·L-1后反应速率基本不再增加.更多还原

【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.更多还原