期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 217, 期 -, 页码 555-564出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2018.04.003
关键词
Heterogeneous photocatalysis; Process intensification; Hexavalent chromium reduction; NETmix photoreactor; Microscale illumination
资金
- Associate Laboratory LSRE-LCM - FEDER funds through COMPETE2020 - Programa Operacional Competitividade e Internacionalizacao (POCI) [POCI-01-0145-FEDER-006984]
- national funds through FCT - Fundacao para a Ciencia e a Tecnologia
- FCT Investigator Programme [IF/00273/2013]
- Capes [BEX-0983-13-6]
- FCT [SFRH/BPD/101456/2014]
- European Union
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/101456/2014] Funding Source: FCT
The current work presents different approaches to overcome mass and photon transfer limitations in heterogeneous photocatalytic processes applied to the reduction of hexavalent chromium to its trivalent form in the presence of a sacrificial agent. Two reactor designs were tested, a monolithic tubular photoreactor (MTP) and a micro-meso-structured photoreactor (NETmix), both presenting a high catalyst surface area per reaction liquid volume. In order to reduce photon transfer limitations, the tubular photoreactor was packed with transparent cellulose acetate monolithic structures (CAM) coated with the catalyst by a dip-coating method. For the NETmix reactor, a thin film of photocatalyst was uniformly deposited on the front glass slab (GS) or on the network of channels and chambers imprinted in the back stainless steel slab (SSS) using a spray system. The reaction rate for the NETmix photoreactor was evaluated for two illumination sources, solar light or UVA-LEDs, using the NETmix with the front glass slab or/and back stainless steel slab coated with TiO2-P25. The reusability of the photocatalytic films on the NETmix walls was also evaluated for three consecutive cycles using fresh Cr(VI) solutions. The catalyst reactivity in combination with the NETmix-SSS photoreactor is almost 70 times superior to one obtained with the MTP. (C) 2018 Elsevier Ltd. All rights reserved.
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