水环境中内分泌干扰物的光降解行为研究Ⅳ——雌酮在水溶液中的光降解

Photodegradation Behaviors of Endocrine Disruptors in Aquatic Environment. Ⅳ --Photodegradation of Estrone in Aqueous Solutions

应用荧光光谱法和红外光谱法研究了在 12 5W高压汞灯 (λ≥ 36 5nm)照射下 ,水中雌酮的光降解反应以及雌酮初始浓度、pH值及Fe3+ 对雌酮光降解速率的影响 结果表明 ,雌酮在光降解时破坏了其苯环结构 ,生成了含有羰基的氧化产物 雌酮浓度在 3 .0～ 2 0 .0mg/L范围内 ,其光降解反应符合准一级反应动力学规律 ,雌酮初始浓度越大 ,降解速率越小 ;初始 pH值在 2 .0～ 8.0范围内 ,光降解速率在pH为 4.7左右时最小 .在 pH 2 .0～5 .0条件下 ,Fe3+ 的存在可加快雌酮的降解 .

The photodegradation of estrone in aqueous solutions under irradiation of high pressure mercury lamp (λ≥365 nm,125 W) was investigated in this paper by means of fluorescence and infrared spectra. The result suggested that estrone in aqueous solutions undergoes photodegradation resulting in the breakage and oxidation of benzene rings and production of compounds containing carbonyl groups. The photodegradation of 3.0～20.0 mg/L estrone in aqueous solutions was pseudo-first order reaction. Increasing the initial concentration of estrone lowers the photodegradation rate. The photodegradation rate reached the lowest value at pH about 4.7. Fe 3+ can promote the photodegradation of estrone in aqueous solutions at pH value of 2.0～5.0.