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2D-montmorillonite-dispersed G-C3N4/TIO2 2D/0D nanocomposite for enhanced photo-induced H2 evolution from glycerol-water mixture

Nur Fajrina, Nur Fajrina and Tahir, Muhammad (2019) 2D-montmorillonite-dispersed G-C3N4/TIO2 2D/0D nanocomposite for enhanced photo-induced H2 evolution from glycerol-water mixture. Applied Surface Science, 471 . pp. 1053-1064. ISSN 0169-4332

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Official URL: http://dx.doi.org/10.1016/j.apsusc.2018.12.076

Abstract

Montmorillonite (MMT) dispersed g-C3N4/TiO2 hybrid nanocomposite for enhanced photo-catalytic hydrogen production from glycerol-water mixture has been investigated. The newly designed composite photo-catalysts were fabricated through a sol-gel assisted hydrothermal method and were characterized by XRD, XPS, SEM, EDX, TEM, FTIR, UV–Vis, Raman and PL spectroscopy. Well-designed g-C3N4/MMT/TiO2 heterojunction composite was obtained with 2D MMT structure, which promoted both visible light absorption and hindered charges recombination rate. The modification of 2D/0D g-C3N4/TiO2 heterojunction with 2D MMT sheets enhances H2 production due to MMT works as a mediator for effective charges trapping and transportation within the composite structure. The g-C3N4/MMT/TiO2 photo-catalyst exhibits highest H2 production of 4425 ppm h−1 g−1 at pH 7.0, which was 2.12 times higher than the pure TiO2 (2085 ppm h−1 g−1 ). In addition, increasing catalyst loading promotes more H2 evolution and among the different sacrificial reagents, glycerol-water mixture gave highest H2 production due to the presence of α-hydrogen atoms attached to carbon atoms. The enhanced photo-catalytic efficiency can be attributed to synergistic effect of MMT with g-C3N4/TiO2 heterojunction composite, appropriate band structure and transportation of electrons–holes with their hindered recombination rate. These composite catalysts exhibited excellent photo-catalytic stability for H 2 production in cyclic runs. Possible reaction mechanism for hydrogen production over g-C3N4/MMT/TiO2 composite has been explained based on the experimental results. The finding of this work would be fruitful for hydrogen production applications with all sustainable systems.

Item Type:Article
Uncontrolled Keywords:g-C3N4, hydrogen production, montmorillonite
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:87619
Deposited By: Yanti Mohd Shah
Deposited On:30 Nov 2020 17:06
Last Modified:30 Nov 2020 17:06

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