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Open AccessArticle

Carbon Nanotubes Incorporated Z-Scheme Assembly of AgBr/TiO2 for Photocatalytic Hydrogen Production under Visible Light Irradiations

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Department of Chemical Engineering, Faculty of Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia
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Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, Lahore 54000, Pakistan
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Department of Chemical Engineering, College of Engineering, Jazan University, Jazan 45142, Saudi Arabia
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Centre of Contaminant Control & Utilization, Institute of Contaminant Management (ICM), Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Perak, Malaysia
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Department of Chemistry, The University of Lahore, 1-km Raiwind Road, Lahore 54000, Pakistan
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Chemical Reaction Engineering Group (CREG), School of Chemical and Energy Engineering, Universiti Teknologi Malaysia, Skudai, Johor Bahru 81310 UTM, Johor, Malaysia
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Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1767; https://doi.org/10.3390/nano9121767
Received: 19 November 2019 / Revised: 3 December 2019 / Accepted: 4 December 2019 / Published: 11 December 2019
(This article belongs to the Special Issue Hybrid Nanosystems for Artificial Photosynthesis)
Photocatalytic H2 production is a promising strategy toward green energy and alternative to carbon-based fuels which are the root cause of global warming and pollution. In this study, carbon nanotubes (CNTs) incorporated Z-scheme assembly of AgBr/TiO2 was developed for photocatalytic H2 production under visible light irradiations. Synthesized photocatalysts were characterized through transmission electron microscope (TEM), X-ray photoelectron spectra (XPS), X-ray diffractometer (XRD), Fourier transform infrared (FTIR), photoluminescence spectra (PL), Brunauer Emmet-Teller(BET), and UV-vis spectroscopy analysis techniques. The composite photocatalysts exhibited a H2 production of 477 ppm which was three-folds higher than that produced by TiO2. The good performance was attributed to the strong interaction of three components and the reduced charge recombination, which was 89 and 56.3 times lower than the TiO2 and AgBr/TiO2. Furthermore, the role of surface acidic and basic groups was assessed and the photocatalytic results demonstrated the importance of surface functional groups. In addition, the composites exhibited stability and reusability for five consecutive cycles of reaction. Thus, improved performance of the photocatalyst was credited to the CNTs as an electron mediator, surface functional groups, higher surface area, enhanced charge separation and extended visible light absorption edge. This work provides new development of Z-scheme photocatalysts for sustainable H2 production. View Full-Text
Keywords: Z-scheme photocatalyst; solid-state electron mediator; carbon nanotubes; titanium dioxide; silver bromide; hydrogen production Z-scheme photocatalyst; solid-state electron mediator; carbon nanotubes; titanium dioxide; silver bromide; hydrogen production
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MDPI and ACS Style

Shezad, N.; Maafa, I.M.; Johari, K.; Hafeez, A.; Akhter, P.; Shabir, M.; Raza, A.; Anjum, H.; Hussain, M.; Tahir, M. Carbon Nanotubes Incorporated Z-Scheme Assembly of AgBr/TiO2 for Photocatalytic Hydrogen Production under Visible Light Irradiations. Nanomaterials 2019, 9, 1767.

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