Intensification of heterogeneous TiO2 photocatalysis using the NETmix mili-photoreactor under microscale illumination for oxytetracycline oxidation 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Science of the Total Environment
年/卷/期
2019 / 681 /
页码
467-474
ISSN号
0048-9697
作者单位
Univ Porto, Fac Engn, Dept Chem Engn, LSRE LCM, Rua Dr Roberto Frias, P-4200465 Porto, Portugal;Univ Porto, Fac Engn, Dept Chem Engn, LSRE LCM, Rua Dr Roberto Frias, P-4200465 Porto, Portugal;Univ Porto, Fac Engn, Dept Chem Engn, LSRE LCM, Rua Dr Roberto Frias, P-4200465 Porto, Portugal;Univ Porto, Fac Engn, Dept Chem Engn, LSRE LCM, Rua Dr Roberto Frias, P-4200465 Porto, Portugal;Univ Porto, Fac Engn, Dept Chem Engn, LSRE LCM, Rua Dr Roberto Frias, P-4200465 Porto, Portugal;Univ Porto, Fac Engn, Dept Chem Engn, LSRE LCM, Rua Dr Roberto Frias, P-4200465 Porto, Portugal;Univ Porto, Fac Engn, Dept Chem Engn, LSRE LCM, Rua Dr Roberto Frias, P-4200465 Porto, Portugal;
作者
Cristovao, Raquel O.;Santos, Sara G. S.;Boaventura, Rui A. R.;Espindola, Jonathan C.;Dias, Madalena M.;Lopes, Jose Carlos B.;Vilar, Vitor J. P.;
摘要
This study focuses on the intensification of heterogeneous TiO2 photocatalysis for the removal of a contaminant of emerging concern (CEC), oxytetracycline (OTC), as a polishing step of urban wastewaters, using an innovative NETmix mili-photoreactor under UVA-LEDs illumination. The effect of catalyst coated surface per reactor volume and the illumination mechanism, back-side (BSI) or front-side (FSI) irradiation, on arc oxidation were evaluated. For that, a thin film of photocatalyst was uniformly deposited on the front borosilicate slab (BS) (BSI mechanism; 333 m(catalyst)(2)m(reactor)(-3)) or on the network of channels and chambers imprinted in the back stainless-steel slab (SSS) (FSI mechanism; 989 m(catalyst)(2)m(reactor)(-3)) using a spray system. OTC removal was also assessed as a function of TiO2 film thickness immobilized on both slabs. The photocatalyst reactivity in combination with photoreactor was significantly enhanced (3.4 times) from 0.64 to 2.19 mmol(OTC) m(illuminated reactor volume)(-3) s(-1), when considering the BSI and FSI mechanisms, respectively. In addition, the influence of UVA-LEDs intensity on OTC oxidation rate was investigated. UVA-LEDs plates were placed on the top of the NETmix borosilicate window. Moreover, the effect of water matrix was assessed using a secondary effluent from an urban wastewater treatment plant fortified with OTC. OTC oxidation rate was only inhibited in about 1.3 times in the presence of the real matrix, showing the ability of the NETrnix to overcome matrix effects due to its unique characteristics. Catalyst film stability over four consecutive reaction cycles was evaluated using synthetic and real matrices fortified with OTC. (C) 2019 Published by Elsevier B.V.
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关键词/主题词
Process intensification;NETmix mili-photoreactor;TiO2 photocatalysis;LEDs;Contaminants of emerging concern;
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