UV/TiO2悬浮体系光催化降解碱性品红及机理研究

研究了在UV／TiO2悬浮体系中光催化降解碱性品红。考察了碱性品红浓度、悬浮液pH值和外加无机盐对降解效果的影响。实验结果表明，当碱性品红质量浓度分别为20．0mg／L，30．0mg／L，40．0mg/L时，光照180min后，悬浮液中剩余的碱性品红质量浓度分别为1．8mg／L，2．3mg／L，3．4mg／L。pH=9．00时降解效果最好，当初始碱性品红质量浓度为30mg/L时，光照180min后，悬浮液中剩余的碱性品红质量浓度为0．8mg／L；pH=3．00的降解效果最差，光照180min后，悬浮液中剩余的碱性品红质量浓度为6．8mg／L；无机盐对降解效果有不同程度的负面影响。对降解机理的探讨表明光催化反应发生在光催化剂表面。

Study on photocatalytic degradation of basic violet and mechanism in UV/TiO2 suspension system

The photocatalytic degradation of basic violet in UV/TiO2 system is focused on in this study. The effects of the concentration of basic violet, pH value and additive inorganic salt on degradation effeciency have been investigated. The experimental results show that when the initial concentrations of basic violet are 20.0 mg/L, 30.0 mg/L, 40.0 mg/L respectively, the remains of basic violet are 1.8 mg/L, 2.3 mg/L, 3.4 mg/L correspondingly after irradiated for 180 min. The highest and the lowest degradation effeciency are observed when pH value is 9.00 and 3.00 respectively. The inorganic salt has negative impact to different extent on degradation of basic violet. The exploration of the degradation mechanism indicates that photocatalytic degradation takes place on the surface of the photocatalysts.