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Engineering approach in stimulating photocatalytic H2 production in a slurry and monolithic photoreactor systems using Ag-bridged Z-scheme pCN/TiO2 nanocomposite

Ag-bridged pCN/TiO2 Z-scheme heterojunction composite with faster charges separation for stimulating H2 evolution under UV and visible light in different photo-catalytic reactor systems has been investigated. The photo-catalytic activity was tested using slurry, fixed bed and monolith photo-reactor...

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Main Authors: Nur Fajrina, Nur Fajrina, Tahir, Muhammad
Format: Article
Published: Elsevier B.V. 2019
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TP Chemical technology
Online Access:http://eprints.utm.my/id/eprint/87735/
http://dx.doi.org/10.1016/j.cej.2019.06.011
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spelling my.utm.877352020-11-30T13:15:13Z http://eprints.utm.my/id/eprint/87735/ Engineering approach in stimulating photocatalytic H2 production in a slurry and monolithic photoreactor systems using Ag-bridged Z-scheme pCN/TiO2 nanocomposite Nur Fajrina, Nur Fajrina Tahir, Muhammad TP Chemical technology Ag-bridged pCN/TiO2 Z-scheme heterojunction composite with faster charges separation for stimulating H2 evolution under UV and visible light in different photo-catalytic reactor systems has been investigated. The photo-catalytic activity was tested using slurry, fixed bed and monolith photo-reactor systems for continuous H2 production from glycerol-water mixture. Using slurry system, Ag-pCN/TiO2 photo-catalyst produced 470 µmol h−1 of H2 which is 8.41 and 9.66 times higher than pCN/TiO2 and pristine TiO2, respectively. The efficiency was improved due to development of heterojunction with faster charges separation, whereas, Ag provides hot photo-generated electrons by surface plasmon resonance (SPR) and active sites for H2 production. The parameters study reveals that highest H2 was obtained at pH 7, glycerol concentration of 5 wt% and 0.15 g of catalyst loading. Furthermore, by applying engineering approach Ag-pCN/TiO2 showed H2 production rate of 10150 μmol h−1 using monolith reactor, a 13.36 and 21.6 times higher than fixed-bed and slurry photoreactors. The monolith honeycomb reactor exhibited higher AQY and space yield of 49.15% and 67.67 µmol h−1 cm−3 than slurry reactor (15.77%, 3.615 µmol h-1cm−3) and fixed-bed reactor (1.63%, 3.233 µmol h-1cm−3). The superior performance of a monolith reactor was due to higher photon flux utilization, large illuminated surface area and processing volume. The schematic of conversional and Z-scheme mechanism of Ag-pCN/TiO2 were proposed based on the results. Thus, excellent performance of catalyst using monolith reactor compared to slurry and fixed-bed reactor for H2 production would offer a new opportunity of engineering approach for renewable fuels applications. Elsevier B.V. 2019-10-15 Article PeerReviewed Nur Fajrina, Nur Fajrina and Tahir, Muhammad (2019) Engineering approach in stimulating photocatalytic H2 production in a slurry and monolithic photoreactor systems using Ag-bridged Z-scheme pCN/TiO2 nanocomposite. Chemical Engineering Journal, 374 . pp. 1076-1095. ISSN 1385-8947 http://dx.doi.org/10.1016/j.cej.2019.06.011 DOI:10.1016/j.cej.2019.06.011
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TP Chemical technology
spellingShingle TP Chemical technology
Nur Fajrina, Nur Fajrina
Tahir, Muhammad
Engineering approach in stimulating photocatalytic H2 production in a slurry and monolithic photoreactor systems using Ag-bridged Z-scheme pCN/TiO2 nanocomposite
description Ag-bridged pCN/TiO2 Z-scheme heterojunction composite with faster charges separation for stimulating H2 evolution under UV and visible light in different photo-catalytic reactor systems has been investigated. The photo-catalytic activity was tested using slurry, fixed bed and monolith photo-reactor systems for continuous H2 production from glycerol-water mixture. Using slurry system, Ag-pCN/TiO2 photo-catalyst produced 470 µmol h−1 of H2 which is 8.41 and 9.66 times higher than pCN/TiO2 and pristine TiO2, respectively. The efficiency was improved due to development of heterojunction with faster charges separation, whereas, Ag provides hot photo-generated electrons by surface plasmon resonance (SPR) and active sites for H2 production. The parameters study reveals that highest H2 was obtained at pH 7, glycerol concentration of 5 wt% and 0.15 g of catalyst loading. Furthermore, by applying engineering approach Ag-pCN/TiO2 showed H2 production rate of 10150 μmol h−1 using monolith reactor, a 13.36 and 21.6 times higher than fixed-bed and slurry photoreactors. The monolith honeycomb reactor exhibited higher AQY and space yield of 49.15% and 67.67 µmol h−1 cm−3 than slurry reactor (15.77%, 3.615 µmol h-1cm−3) and fixed-bed reactor (1.63%, 3.233 µmol h-1cm−3). The superior performance of a monolith reactor was due to higher photon flux utilization, large illuminated surface area and processing volume. The schematic of conversional and Z-scheme mechanism of Ag-pCN/TiO2 were proposed based on the results. Thus, excellent performance of catalyst using monolith reactor compared to slurry and fixed-bed reactor for H2 production would offer a new opportunity of engineering approach for renewable fuels applications.
format Article
author Nur Fajrina, Nur Fajrina
Tahir, Muhammad
author_facet Nur Fajrina, Nur Fajrina
Tahir, Muhammad
author_sort Nur Fajrina, Nur Fajrina
title Engineering approach in stimulating photocatalytic H2 production in a slurry and monolithic photoreactor systems using Ag-bridged Z-scheme pCN/TiO2 nanocomposite
title_short Engineering approach in stimulating photocatalytic H2 production in a slurry and monolithic photoreactor systems using Ag-bridged Z-scheme pCN/TiO2 nanocomposite
title_full Engineering approach in stimulating photocatalytic H2 production in a slurry and monolithic photoreactor systems using Ag-bridged Z-scheme pCN/TiO2 nanocomposite
title_fullStr Engineering approach in stimulating photocatalytic H2 production in a slurry and monolithic photoreactor systems using Ag-bridged Z-scheme pCN/TiO2 nanocomposite
title_full_unstemmed Engineering approach in stimulating photocatalytic H2 production in a slurry and monolithic photoreactor systems using Ag-bridged Z-scheme pCN/TiO2 nanocomposite
title_sort engineering approach in stimulating photocatalytic h2 production in a slurry and monolithic photoreactor systems using ag-bridged z-scheme pcn/tio2 nanocomposite
publisher Elsevier B.V.
publishDate 2019
url http://eprints.utm.my/id/eprint/87735/
http://dx.doi.org/10.1016/j.cej.2019.06.011
_version_ 1685578981375475712
score 13.211869

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