کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4413331 1307673 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Titanium dioxide mediated photocatalytic degradation of 17β-estradiol in aqueous solution
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Titanium dioxide mediated photocatalytic degradation of 17β-estradiol in aqueous solution
چکیده انگلیسی

Photocatalytic degradation of 17β-estradiol (E2) in aqueous medium mediated with titanium dioxide (TiO2) was studied. Moreover, effect of TiO2 dosage on the degradation efficiency was investigated. Particular attention was paid to the identification of intermediates and analysis of photocatalytic degradation mechanism of E2 under neutral and alkaline conditions. The degradation efficiency of E2 increased with increasing concentration of TiO2 but decreased due to light scattering as TiO2 concentration was greater than 0.5 mg ml−1. Several intermediates were formed during photocatalytic degradation of E2. However, only a few of the compounds could be identified and confirmed by LC–MS and LC–MS/MS. Six intermediates were observed by photocatalytic oxidation under alkaline conditions, namely 2-hydroxyestradiol, 10ε-17β-dihydroxy-1,4-estradien-3-one (DEO), 10ε-hydroperoxide-17β-hydroxy-1,4-estradien-3-one and three kinds of dicarboxylic acids formed by the opening of aromatic ring. In addition to the six intermediates mentioned above, 17β-hydroxy-1,4-estradien-3-one (EO) was observed under neutral conditions and in the presence of methanol. Based on these intermediates, which were hardly degraded even after E2 was fully degraded, the mechanism of E2 degradation by TiO2 photocatalysis was elucidated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 73, Issue 4, September 2008, Pages 600–606
نویسندگان
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