Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 7, Pages 4355-4375Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.11.194
Keywords
Photocatalytic H-2 production; Structured Mt-Ag/pCN-TiO2; Two phase reactors; Three phase reactor; Monolith reactor; Sacrificial reagents
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Funding
- Universiti Teknologi Malaysia (UTM) through Research University Grant (GUP) [16J58]
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Fabricating montmorillonite (Mt) dispersed Ag/pCN-TiO2 heterojunction for stimulating photocatalytic H-2 evolution using two/three phases photo-reactor systems has been investigated. Using Ag-Mt/pCN-TiO2 composite in three-phase, H-2 rate of 667 mu molh(-1) was obtained, much greater than TiO2-based samples due to superior charges separation with Ag SPR and Mt mediated effect. Among parameters, 0.15 g catalyst loading at pH 7 gives highest H-2 yield with glycerol sacrificial reagents. More interestingly, liquid system with glycerol gave best H-2 rate while gas-phase with methanol encouraged H-2 productivity. Furthermore, H-2 rate increased to 8230 mu molh(-1) using two-phase monolith reactor, 9.01 and 12.34 times greater than two-phase fixed-bed and three-phase slurry systems. Comparatively, highest AQY and SY of 39.85% and 54.86 mu molh(-1)cm(-3) were obtained using monolith. This superior efficiency was due to efficient photon-flux consumption, effective mass-transfer and large light-fluxed. These findings would be fruitful for further development for clean hydrogen production through photocatalytic water splitting. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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