Photocatalytic reduction of CO2 to methanol over ZnFe2O4/TiO2 (p�n) heterojunctions under visible light irradiation

Iqbal, F. and Mumtaz, A. and Shahabuddin, S. and Abd Mutalib, M.I. and Shaharun, M.S. and Nguyen, T.D. and Khan, M.R. and Abdullah, B. (2020) Photocatalytic reduction of CO2 to methanol over ZnFe2O4/TiO2 (p�n) heterojunctions under visible light irradiation. Journal of Chemical Technology and Biotechnology, 95 (8). pp. 2208-2221.

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BACKGROUND: The development of visible light photocatalysts for CO2 reduction into methanol is a challenge, as most of the reported photocatalysts can only work in a UV light environment. Slow kinetics and poor selectivity of CO2 towards methanol are currently two significant drawbacks limiting the practical application of CO2 reduction into methanol. RESULTS: A ZnFe2O4/TiO2 heterojunction with a ratio of unity was found to lead to the highest methanol yield of 693.31 μmol (g cat)�1 under a light intensity of 100 mW cm�2. This photocatalyst also possessed the highest BET surface area of 6.5211 m2 g�1 and better morphological structure, as compared with other ratios (1:2, 2:1 w/w). Interestingly, a loading of 1 g L�1 of ZnFe2O4/TiO2 (1:1) heterojunction photocatalyst in the pre-annealing treatment of ZnFe2O4 at 900 °C and post-annealing treatment of ZnFe2O4/TiO2 (1:1) composite at 500 °C revealed that there was an enhancement in the interfacial interaction, and subsequently an efficient photoreduction of CO2 into methanol. CONCLUSIONS: This study demonstrates facile fabrication of p�n heterostructured phototcatalysts for reduction of CO2 with marked improvement in methanol yield under visible light irradiation. It provides a viable route for exploring the effects of composition, hydrothermal treatment, and pre-/post-annealing treatment of hybrid semiconductor composites used to scale up photocatalytic CO2 conversion in solar fuel-based devices. © 2020 Society of Chemical Industry

Item Type: Article
Impact Factor: cited By 17
Uncontrolled Keywords: Annealing; Carbon dioxide; Heterojunctions; Iron compounds; Irradiation; Light; Methanol; Photocatalytic activity; Titanium compounds, Hydrothermal treatments; Interfacial interaction; Morphological structures; Photocatalytic reduction; Post annealing treatment; Semiconductor composite; Visible-light irradiation; Visible-light photocatalysts, Zinc compounds, carbon dioxide; methanol; nitrate; titanium dioxide; zinc, Article; calcination temperature; chemical composition; chemical structure; comparative study; crystal structure; electron diffraction; energy dispersive X ray spectroscopy; high resolution transmission electron microscopy; light intensity; molecular stability; oxidation; oxidation reduction reaction; photocatalysis; reduction (chemistry); surface area; synthesis; ultraviolet radiation
Departments / MOR / COE: Research Institutes > Green Technology
Depositing User: Ms Sharifah Fahimah Saiyed Yeop
Date Deposited: 29 Mar 2022 02:03
Last Modified: 29 Mar 2022 02:03

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