Degradation of four steroid hormones in aqueous solution by UV/ferrate coupling system
The degradation of steroid hormone pollutants in water by UV/Fe(Ⅵ)coupling system was studied.The effects of Fe(Ⅵ)concentration,pH,inorganic ions and dissolved organic matter on pollutant degradation were examined.The results demonstrated that the UV/Fe(Ⅵ)coupling system had higher efficiency compared with using UV and Fe(Ⅵ)alone,mainly due to the accelerated decomposition of Fe(Ⅵ)by UV activation and generation of more oxidative species of Fe(Ⅳ)and Fe(Ⅴ).The removal rate of four steroid hormones contaminants were over 87.9%within 40 minutes under UV-254 nm illumination with 0.8 mmmol·L-1 of Fe(Ⅵ)under neutral and alkaline condition with pH values of 5.0～11.0.The common inorganic ions in environmental water exhibited no significant effects on the degradation of contaminants by UV/Fe(Ⅵ)system.However,high concentrations of dissolved organic matter had a certain inhibitory effect.It is shown that UV/Fe(Ⅵ)coupling system is a promising water treatment method for removing steroid hormone pollutants.
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