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Photocatalytic degradation of phenol wastewater over Z-scheme g-C 3 N 4 /CNT/BiVO 4 heterostructure photocatalyst under solar light irradiation

Samsudin, M.F.R. and Bacho, N. and Sufian, S. and Ng, Y.H. (2019) Photocatalytic degradation of phenol wastewater over Z-scheme g-C 3 N 4 /CNT/BiVO 4 heterostructure photocatalyst under solar light irradiation. Journal of Molecular Liquids, 277 . pp. 977-988.

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Abstract

A series of carbon nanotubes (CNT) modified g-C 3 N 4 /BiVO 4 photocatalysts were synthesized via wet-impregnation method and evaluated via degradation of phenol under solar light irradiation. The physicochemical properties of the as-developed photocatalyst were characterized using FTIR, XRD, FESEM, XPS, SAP and DR-UV Vis. The formation of g-C 3 N 4 /CNT/BiVO 4 photocatalysts resulted in remarkable enhancement in the performance in which almost six times higher degradation rate in comparison to the pristine g-C 3 N 4 and obeyed the pseudo-first-order kinetics and Temkin adsorption model. Congruously, the synergistic interaction between 2 wt of CNT and 5 vol of H 2 O 2 as an oxidizing agent was capable of removing 80.6 of phenol within 120 min. The profound photodegradation performance monitored was attributed to the better crystallinity structure obtained as shown in XRD and XPS analysis. Furthermore, the intimate contact between the CNT, g-C 3 N 4 and BiVO 4 in the heterostructure sample as shown in FESEM micrograph images does help in allowing a smooth electron-hole pair separation and migration, resulting in more available �OH and �O 2 ¯ radicals for photocatalytic degradation activities. The possible Z-scheme reaction mechanism has been proposed and active species trapping experiments have been carried out to find the role of active radical species responsible for the phenol degradation. Additionally, the g-C 3 N 4 /CNT/BiVO 4 photocatalysts retained excellent stability even after several cycles. Congruently, a mathematical representation for understanding the interaction between CNT loading and H 2 O 2 for photodegradation of phenol using response surface methodology (RSM) was successfully generated. © 2018 Elsevier B.V.

Item Type:Article
Impact Factor:cited By 1
Uncontrolled Keywords:Bismuth compounds; Carbon nanotubes; Carbon nitride; Degradation; Dyes; Irradiation; Phenols; Photocatalysts; Wastewater; X ray diffraction; X ray photoelectron spectroscopy; Yarn, Bismuth vanadates; Graphitic carbon nitrides; Mathematical representations; Phenol degradation; Photo catalytic degradation; Physicochemical property; Pseudo first-order kinetics; Response surface methodology, Biodegradation
ID Code:22119
Deposited By: Ahmad Suhairi
Deposited On:28 Feb 2019 07:57
Last Modified:28 Feb 2019 07:57

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