二氧化钛光催化降解双酚AF研究

Photocatalytic Degradation of Bisphenol AF in TiO_2 Suspension

系统研究了双酚AF在二氧化钛溶液中的光催化降解行为。就溶解氧、二氧化钛投加量、氟离子浓度和双酚AF的初始浓度等因素对双酚AF降解的影响进行了详细讨论。研究重点是双酚AF的降解动力学以及在降解过程中所产生的氟离子浓度。当双酚AF的初始浓度是40μmol/L时,经过540 min的光催化降解,反应体系的总有机碳去除率超过97%,此时溶液中氟离子的浓度为0.98 mg/L。双酚AF在二氧化钛溶液中的降解符合Langmuir-Hinshelwood动力学模型,其降解动力学常数是1.21μmol/(L·min)。结果表明,二氧化钛光催化可以有效的去除双酚AF,并且不产生其它二次污染物。

Photodegradation behavior of bisphenol AF （BPAF） in TiO2 suspension was investigated. Influence of dissolved oxygen, TiO2 dosage, fluoride and initial BPAF concentration on the degradation of BPAF was studied and described in details. The degradation kinetics of BPAF and the fluoride concentration during the degradation were focused. At an initial concentration of 40 μmol/L, more than 97% of TOC was removed within 540 min irradiation in the fluoride concentration of 0.98 mg/L. Degradation of BPAF followed the Langmuir-Hinshelwood kinetics rate model and reaction rate constant was 1.21 μmol/（L·min）. Results indicated that TiO2 photocatalytic degradation is a highly effective way to remove BPAF without any generation of more toxic products or fluoride pollution.