Feng Xianghua, Tu Jianfeng, Ding Shimin, Wu Feng, Deng Nansheng
College of Resources and Environmental Sciences, Wuhan University, PR China.
J Hazard Mater. 2005 Dec 9;127(1-3):129-33. doi: 10.1016/j.jhazmat.2005.06.039. Epub 2005 Aug 18.
Photodegradation of 17beta-estradiol (E2) in aqueous solutions by UV-vis/Fe(III)/H(2)O(2) system, namely Photo-Fenton system, was preliminarily investigated under a 250 W metal halide lamp (lambda > or = 313 nm). The influences of initial pH value, initial concentration of H(2)O(2) and E2 on photodegradation efficiency of E2 were discussed and the amount of CO(2) produced by the photodegradation reaction was measured. The results indicates that E2 could be decomposed efficiently in UV-vis/Fe(III)/H(2)O(2) system. Under the condition of 10.0 micromol L(-1) Fe(III), 1000 micromol L(-1) H(2)O(2) and pH 3.0, the degradation efficiency of 18.4 micromol L(-1) E2 reach 75.2% after the irradiation of 160 min. Over the range of pH 3.0-6.0, the higher acidity, the higher the degradation efficiency of E2 and initial reaction rate are. The degradation efficiency of E2 increases with increasing of initial concentration of H(2)O(2) and with decreasing of initial concentration of E2. The E2 mineralization efficiency increases with reaction time but the mineralization efficiency was lower. When the initial concentration of Fe(III) and H(2)O(2) were 10.0 and 1000 micromol L(-1), respectively, the mineralization efficiency of 18.4 micromol L(-1) E2 solution with pH 3.0 was only 21.6% after 160 min irradiation. It is suggested that the mineralization occurred probably only at aromatic ring.
在250W金属卤化物灯（λ≥313nm）照射下，初步研究了17β-雌二醇（E2）在水溶液中通过紫外可见/Fe(III)/H₂O₂体系（即光芬顿体系）的光降解情况。讨论了初始pH值、H₂O₂和E2的初始浓度对E2光降解效率的影响，并测定了光降解反应产生的CO₂量。结果表明，E2在紫外可见/Fe(III)/H₂O₂体系中能有效分解。在10.0μmol L⁻¹ Fe(III)、1000μmol L⁻¹ H₂O₂和pH 3.0的条件下，18.4μmol L⁻¹ E2在照射160min后的降解效率达到75.2%。在pH 3.0 - 6.0范围内，酸度越高，E2的降解效率和初始反应速率越高。E2的降解效率随H₂O₂初始浓度的增加和E2初始浓度的降低而增加。E2的矿化效率随反应时间增加，但矿化效率较低。当Fe(III)和H₂O₂的初始浓度分别为10.0和1000μmol L⁻¹时，pH 3.0的18.4μmol L⁻¹ E2溶液在照射160min后的矿化效率仅为21.6%。表明矿化可能仅发生在芳香环上。
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