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| Competitive degradation and transformation trend of three steroid estrogens in UV system |
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Abstract UV(/H2O2/TiO2) was applied to remove three co-existing steroid estrogens, including estrone (E1), 17β-estradiol (E2) and 17α-ethinyl estradiol (EE2) from aqueous solutions. The degradation fitted first-order kinetic models very well, with the significance of three key impact factors on degradation followed the order of H2O2 > irradiation intensity >TiO2. E1took advantages in competitive degradation for its character of photosensitiveness. The order of degradation rates of E2 and EE2 under UV alone was dependent on UV intensity. EE2 had slight superiority with the increase of UV intensity. Addition of H2O2 and TiO2 facilitated the degradation of E1while with minor impact on E2 and EE2 due to the competition of E1. E1, E2 and EE2 exhibited analogous transformation pathway during photodegradation. Same byproduct structurally similar with E1was detected.
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Received: 16 August 2013
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