雌二醇在铁(Ⅲ)-草酸盐配合物体系中的光降解
PHOTODEGRADATION OF ESTRADIOL IN WATER BY Fe(Ⅲ) /OXALATE SYSTEM
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摘要: 以125W高压汞灯为光源,研究了水中雌二醇(E2)在铁(Ⅲ)-草酸盐体系中的光降解;考查了初始pH值、铁(Ⅲ)/草酸盐配比、E2初始浓度对E2光降解的影响.结果表明,铁(Ⅲ)/草酸盐体系能引发E2光降解.在pH=3.50,Fe(Ⅲ)/草酸盐配比为10.0/120.0μmol·l-1时,2mg·l-1E2光照160min可降解48.0%.在pH3.0—6.0范围内,pH值为3.0—4.0时E2降解率较高;在2.0—10.0mg·l-1范围内,光降解效率随水溶液中E2初始浓度的增加而降低.Abstract: Photodegradation of estradiol (E2) in water by Fe(Ⅲ) /oxalate system was investigated under a 125 Whigh-pressure mercury lamp ( λ≥365 nm). The influence of initial pH value, initial concentrations of E2 and Fe(Ⅲ)/oxalate ratio on photodegradation efficiency of E2 were discussed in detail. The results indicate Fe(Ⅲ)/oxalate syste m can induce photodegradation of E2 efficiently. 48.0% of E2 can be degradated after 160 min radiation in the solution containing Fe(Ⅲ)/oxalate 10.0/120.0 μmol·l-1 at pH3.5. Higher degradation efficiency of E2 is obtained at pH3.0—4.0 over pHrange of 3.0—6.0;the photodegradation effic iency decreases with increasing the initial concentration of E2.
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Key words:
- estradiol /
- photodegradation /
- complexes /
- hydroxyl radical
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