摘要
以250 w照明金属卤化物灯为光源,研究了水中雌酮(E1)在UV-Vis/Fe(Ⅲ)/H2O2体系中的光降解;考查了初始pH、Fe(Ⅲ)、H 2O2、E1初始浓度对E1光降解的影响.结果表明,UV-Vis/Fe(Ⅲ)/H2O2体系能有效地光降解E1,在[Fe(Ⅲ)]0=20.8μmol/L、[H2O2]0=1 664μmol/L、pH=3.0时,光照160 min,18.5xmol/L E1的光降解率可达98.4%;在pH 3.0～8.0范围内,pH初始值越小,E1降解率越大,反应初始速率越大;实验条件下,Fe(Ⅲ)、H2O2初始浓度越大,E1降解率越大,反应初始速率越大;E1初始浓度越低,E1降解率越大,反应初始速率越小.pH=3.0,实验浓度范围内的表观动力学方程为:-dCE1/dt=0.000 93[H 2O2]0.47[Fe(Ⅲ)0.62[E1]0.24;Fe(Ⅲ)是影响反应速率的主要浓度因素.
Photodegradation of estrone （E1） in water induced by UV-Vis/Fe（Ⅲ）/H2O2 system was investigated under a 250 W metal halide lamp （λ≥313 nm）. The effects such as initial pH value, initial concentration of Fe（HI）, H2O2 and E1 on photodegradation efficiency of E1 were discussed in detail. The results indicated that E1 could be decomposed efficiently in UV-Vis/Fe（Ⅲ）/H2O2 system. After 160 min irradiation, the photodegradation efficiency of 18.5 μmol/L E1 could reach 98. 4% in the solution containing [-Fe（lll）]0 = 20.8 μmol/L, and [H2O2]0 = 1 664 μmol/L at pH value 3.0. Over the range of pH 3.0-8.0, the lower the pH value, the higher the degradation efficiency and initial rate of E1 was. Under the conditions of the experiment, the degradation efficiency and initial rate of E1 increased with increasing of initial concentration of Fe（Ⅲ） and H2O2. The lower initial concentration of El, the higher degradation efficiency and the lower initial rate of E1 were. The apparent kinetic equation -dCE1/dt =0. 000 93[H2O2]^0.47[Fe（Ⅲ）]^0.63[E1]^0.24was obtained at pH 3.0. Fe（Ⅲ） was the dominant factor influencing reaction rate.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2005年第6期436-439,共4页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.20177017)
