摘要
采用主波长为２５３７ｎｍ的紫外光杀菌灯或主波长为３６５ｎｍ的黑光灯作为光源，研究了二氧化钛（ＴｉＯ２）膜光催化氧化苯酚水溶液的动力学规律。结果表明：ＴｉＯ２膜光催化氧化苯酚水溶液的动力学可以用ＬａｎｇｍｕｉｒＨｉｎｓｈｅｌｗｏｏｄ（Ｌ－Ｈ）动力学方程描述，但Ｌ－Ｈ方程只是表面反应的必要条件，并不充分；苯酚水溶液在黑光灯／ＴｉＯ２膜处理方式下的降解规律与Ｌ－Ｈ方程揭示的动力学变化过程相吻合；在起始浓度范围相同（２４～１６９０ｍｇ／Ｌ）的情况下，杀菌灯光催化氧化苯酚水溶液表现为一级反应动力学规律；不管哪种光源，ＴｉＯ２膜光催化矿化起始浓度７４０ｍｇ／Ｌ苯酚水溶液的过程均服从一级反应动力学。
Using a germicidal lamp with a peak wavelength at 253.7 nm or a black light fluorescent lamp with a peak wavelengh at 365 nm as the light source respectively,the kinetics of photocatalytic oxidation of phenol aqueous solutions with titanium dioxide film as catalyzer were studied. The results showed that, the kinetics of degradation of phenol with titanium dioxide film as catalyzer could be described by the Langmuir-Hinshelwood (K-H) kinetic equation,but this equation is only the neccessary condition for surface reaction,not sufficint condition. The degradation law of phenol aqueous solution under black light lamp and with titanium dioxide film as catalyzer was identical with that predicted by the K-H equation. Within initial concentrations from 2.40 to 16.9 mg/L, the photocatalytic oxidation of phenol under gemicadal lamp followed the first-order kinetics. The rate of photocatalytic mineralization of phenol aqueous solution at an intial concentration of 7.4 mg/L fitted the first-order equation,independent of which light source used.
出处
《中国给水排水》
CAS
CSCD
北大核心
1999年第2期14-17,共4页
China Water & Wastewater
基金
国家教委博士点基金
关键词
二氧化钛
光催化氧化
酚
水溶液
动力学方程
titanium dioxide photocatalytic oxidation phenol aqueous solution kinetic equations
