Monolithic Ag-Mt dispersed Z-scheme pCN-TiO2 heterojunction for dynamic photocatalytic H2 evolution using liquid and gas phase photoreactors

Nur Fajrina; Muhammad Tahir

doi:10.1016/j.ijhydene.2019.11.194

Monolithic Ag-Mt dispersed Z-scheme pCN-TiO₂ heterojunction for dynamic photocatalytic H₂ evolution using liquid and gas phase photoreactors

Nur Fajrina, Muhammad Tahir

Research output: Contribution to journal › Article › peer-review

55 Citations (Scopus)

Abstract

Fabricating montmorillonite (Mt) dispersed Ag/pCN-TiO₂ heterojunction for stimulating photocatalytic H₂ evolution using two/three phases photo-reactor systems has been investigated. Using Ag–Mt/pCN–TiO₂ composite in three-phase, H₂ rate of 667 μmolh⁻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 H₂ yield with glycerol sacrificial reagents. More interestingly, liquid system with glycerol gave best H₂ rate while gas-phase with methanol encouraged H₂ productivity. Furthermore, H₂ rate increased to 8230 μmolh⁻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 μmolh⁻¹cm⁻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.

Original language	English
Pages (from-to)	4355-4375
Number of pages	21
Journal	International Journal of Hydrogen Energy
Volume	45
Issue number	7
DOIs	https://doi.org/10.1016/j.ijhydene.2019.11.194
Publication status	Published - Feb 7 2020
Externally published	Yes

Keywords

Monolith reactor
Photocatalytic H production
Sacrificial reagents
Structured Mt–Ag/pCN–TiO
Three phase reactor
Two phase reactors

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ijhydene.2019.11.194

Cite this

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title = "Monolithic Ag-Mt dispersed Z-scheme pCN-TiO2 heterojunction for dynamic photocatalytic H2 evolution using liquid and gas phase photoreactors",

abstract = "Fabricating montmorillonite (Mt) dispersed Ag/pCN-TiO2 heterojunction for stimulating photocatalytic H2 evolution using two/three phases photo-reactor systems has been investigated. Using Ag–Mt/pCN–TiO2 composite in three-phase, H2 rate of 667 μmolh−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 H2 yield with glycerol sacrificial reagents. More interestingly, liquid system with glycerol gave best H2 rate while gas-phase with methanol encouraged H2 productivity. Furthermore, H2 rate increased to 8230 μmolh−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 μmolh−1cm−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.",

keywords = "Monolith reactor, Photocatalytic H production, Sacrificial reagents, Structured Mt–Ag/pCN–TiO, Three phase reactor, Two phase reactors",

author = "Nur Fajrina and Muhammad Tahir",

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AU - Tahir, Muhammad

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Y1 - 2020/2/7

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AB - Fabricating montmorillonite (Mt) dispersed Ag/pCN-TiO2 heterojunction for stimulating photocatalytic H2 evolution using two/three phases photo-reactor systems has been investigated. Using Ag–Mt/pCN–TiO2 composite in three-phase, H2 rate of 667 μmolh−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 H2 yield with glycerol sacrificial reagents. More interestingly, liquid system with glycerol gave best H2 rate while gas-phase with methanol encouraged H2 productivity. Furthermore, H2 rate increased to 8230 μmolh−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 μmolh−1cm−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.

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