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Well-designed ZNV2O6/G-C3N4 2D/2D nanosheets heterojunction with faster charges separation via pcn as mediator towards enhanced photocatalytic reduction of CO2 to fuels

Fabrication of well-designed 2D/2D heterojunction composite with effective interfacial contact by incorporating zinc vanadium oxide (ZnV2O6) and protonated g-C3N4 (pCN) for enhanced photocatalytic CO2 reduction has been investigated. The 2D/2D ZnV2O6/pCN samples, synthesized by a one-pot solvotherma...

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Main Authors: Bafaqeer, Abdullah, Tahir, Muhammad, Amin, Nor Aishah Saidina
Format: Article
Published: Elsevier B.V. 2019
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TP Chemical technology
Online Access:http://eprints.utm.my/id/eprint/87450/
http://dx.doi.org/10.1016/j.apcatb.2018.09.097
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spelling my.utm.874502020-11-08T03:59:55Z http://eprints.utm.my/id/eprint/87450/ Well-designed ZNV2O6/G-C3N4 2D/2D nanosheets heterojunction with faster charges separation via pcn as mediator towards enhanced photocatalytic reduction of CO2 to fuels Bafaqeer, Abdullah Tahir, Muhammad Amin, Nor Aishah Saidina TP Chemical technology Fabrication of well-designed 2D/2D heterojunction composite with effective interfacial contact by incorporating zinc vanadium oxide (ZnV2O6) and protonated g-C3N4 (pCN) for enhanced photocatalytic CO2 reduction has been investigated. The 2D/2D ZnV2O6/pCN samples, synthesized by a one-pot solvothermal method, were analysed using XRD, SEM, EDX-mapping, TEM, N2 sorption, XPS, UV–vis, RAMAN and PL characterization techniques. It was observed that surface charge modification through protonation of graphitic carbon nitride serves as a mediator and trapped photo-excited electrons. The performance of composite catalysts was investigated in a liquid and gas phase photocatalytic systems under UV and visible light irradiations. Using slurry system, CH3OH production rate enhanced up to 3742 μmol g-cat−1 over ZnV2O6/pCN, 1.15 and 5 times higher than the pure ZnV2O6 (3254 μmol g-cat−1) and pCN (753 μmol g-cat−1) samples, respectively. Instead, the CO evolution rate as a main product over ZnV2O6/pCN nanosheets of 3237 μmol g-cat−1 was obtained using gas phase system. This enhanced activity can be mainly ascribed to the addition of pCN with ZnV2O6 in a controlled ratio as well as synergistic effect of ZnV2O6/pCN nanosheet heterojunctions. Besides, hierarchical structure, higher interfacial interaction, abundant 2D coupling interfaces and efficient separation of charges could efficiently promote both the photo-activity and products selectivity. The obtained ZnV2O6/pCN 2D/2D nanosheets heterojunction with a mediator exhibited excellent photocatalytic stability, which prevailed even after 32 h of operation time for continuous CH3OH production. The possible reaction mechanism anticipated to understand the movement of electrons and holes for CO2 reduction over the ZnV2O6/pCN photocatalyst. Elsevier B.V. 2019-03 Article PeerReviewed Bafaqeer, Abdullah and Tahir, Muhammad and Amin, Nor Aishah Saidina (2019) Well-designed ZNV2O6/G-C3N4 2D/2D nanosheets heterojunction with faster charges separation via pcn as mediator towards enhanced photocatalytic reduction of CO2 to fuels. Applied Catalysis B: Environmental, 242 . pp. 312-326. ISSN 0926-3373 http://dx.doi.org/10.1016/j.apcatb.2018.09.097 DOI:10.1016/j.apcatb.2018.09.097
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
Bafaqeer, Abdullah
Tahir, Muhammad
Amin, Nor Aishah Saidina
Well-designed ZNV2O6/G-C3N4 2D/2D nanosheets heterojunction with faster charges separation via pcn as mediator towards enhanced photocatalytic reduction of CO2 to fuels
description Fabrication of well-designed 2D/2D heterojunction composite with effective interfacial contact by incorporating zinc vanadium oxide (ZnV2O6) and protonated g-C3N4 (pCN) for enhanced photocatalytic CO2 reduction has been investigated. The 2D/2D ZnV2O6/pCN samples, synthesized by a one-pot solvothermal method, were analysed using XRD, SEM, EDX-mapping, TEM, N2 sorption, XPS, UV–vis, RAMAN and PL characterization techniques. It was observed that surface charge modification through protonation of graphitic carbon nitride serves as a mediator and trapped photo-excited electrons. The performance of composite catalysts was investigated in a liquid and gas phase photocatalytic systems under UV and visible light irradiations. Using slurry system, CH3OH production rate enhanced up to 3742 μmol g-cat−1 over ZnV2O6/pCN, 1.15 and 5 times higher than the pure ZnV2O6 (3254 μmol g-cat−1) and pCN (753 μmol g-cat−1) samples, respectively. Instead, the CO evolution rate as a main product over ZnV2O6/pCN nanosheets of 3237 μmol g-cat−1 was obtained using gas phase system. This enhanced activity can be mainly ascribed to the addition of pCN with ZnV2O6 in a controlled ratio as well as synergistic effect of ZnV2O6/pCN nanosheet heterojunctions. Besides, hierarchical structure, higher interfacial interaction, abundant 2D coupling interfaces and efficient separation of charges could efficiently promote both the photo-activity and products selectivity. The obtained ZnV2O6/pCN 2D/2D nanosheets heterojunction with a mediator exhibited excellent photocatalytic stability, which prevailed even after 32 h of operation time for continuous CH3OH production. The possible reaction mechanism anticipated to understand the movement of electrons and holes for CO2 reduction over the ZnV2O6/pCN photocatalyst.
format Article
author Bafaqeer, Abdullah
Tahir, Muhammad
Amin, Nor Aishah Saidina
author_facet Bafaqeer, Abdullah
Tahir, Muhammad
Amin, Nor Aishah Saidina
author_sort Bafaqeer, Abdullah
title Well-designed ZNV2O6/G-C3N4 2D/2D nanosheets heterojunction with faster charges separation via pcn as mediator towards enhanced photocatalytic reduction of CO2 to fuels
title_short Well-designed ZNV2O6/G-C3N4 2D/2D nanosheets heterojunction with faster charges separation via pcn as mediator towards enhanced photocatalytic reduction of CO2 to fuels
title_full Well-designed ZNV2O6/G-C3N4 2D/2D nanosheets heterojunction with faster charges separation via pcn as mediator towards enhanced photocatalytic reduction of CO2 to fuels
title_fullStr Well-designed ZNV2O6/G-C3N4 2D/2D nanosheets heterojunction with faster charges separation via pcn as mediator towards enhanced photocatalytic reduction of CO2 to fuels
title_full_unstemmed Well-designed ZNV2O6/G-C3N4 2D/2D nanosheets heterojunction with faster charges separation via pcn as mediator towards enhanced photocatalytic reduction of CO2 to fuels
title_sort well-designed znv2o6/g-c3n4 2d/2d nanosheets heterojunction with faster charges separation via pcn as mediator towards enhanced photocatalytic reduction of co2 to fuels
publisher Elsevier B.V.
publishDate 2019
url http://eprints.utm.my/id/eprint/87450/
http://dx.doi.org/10.1016/j.apcatb.2018.09.097
_version_ 1683230769615470592
score 13.211869

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