期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 288, 期 -, 页码 124-133出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2015.02.021
关键词
Rotating reactor; TiO2 nanotubes; Ti mesh; Cr(VI) reduction; Endocrine-disrupting compounds (EDCs); Bisphenol A (BPA); 17 alpha-ethinyl estradiol (EE2); 17 beta-estradiol (E2); Solar irradiation
资金
- Research and Development Program of the Korea Institute of Energy Research [B4-2423-06]
- National Research Council of Science & Technology (NST), Republic of Korea [B4-2423] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, simultaneous treatments, reduction of hexavalent chromium (Cr(VI)) and oxidation of endocrine disrupting compounds (EDCs), such as bisphenol A (BPA), 17 alpha-ethinyl estradiol (EE2) and 17 beta-estradiol (E2), were investigated with a rotating photocatalytic reactor including TiO2 nanotubes formed on titanium mesh substrates under solar UV irradiation. In the laboratory tests with a rotating type I reactor, synergy effects of the simultaneous photocatalytic reduction and oxidation of inorganic (Cr(VI)) and organic (BPA) pollutants were achieved. Particularly, the concurrent photocatalytic reduction of Cr(VI) and oxidation of BPA was higher under acidic conditions. The enhanced reaction efficiency of both pollutants was attributed to a stronger charge interaction between TiO2 nanotubes (positive charge) and the anionic form of Cr(VI) (negative charge), which are prevented recombination (electron-hole pair) by the hole scavenging effect of BPA. In the extended outdoor tests with a rotating type II reactor under solar irradiation, the experiment was extended to examine the simultaneous reduction of Cr(VI) in the presence of additional EDCs, such as EE2 and E2 as well as EPA. The findings showed that synergic effect of both photocatalytic reduction and oxidation was confirmed with single-component (Cr(VI) only), two-components (Cr(VI)/BPA, Cr(VI)IEE2, and Cr(VI)/E2), and four-components (Cr(VI)/BPA/EE2/E2) under various solar irradiation conditions. (C) 2015 Elsevier B.V. All rights reserved.
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