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Investigation of Cu/TiO₂ synthesis methods and conditions for CO₂ photocatalytic reduction via conversion of bicarbonate/carbonate to formate

Adamu, A; Isaacs, M; Boodhoo, K; Abegão, FR; (2023) Investigation of Cu/TiO₂ synthesis methods and conditions for CO₂ photocatalytic reduction via conversion of bicarbonate/carbonate to formate. Journal of CO2 Utilization , 70 , Article 102428. 10.1016/j.jcou.2023.102428. Green open access

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Abstract

This work is aimed at improving the photocatalytic activity of TiO2 in the reduction of CO2. TiO2 and Cu/TiO2 at 5 wt% copper bulk loading were synthesised using the sol-gel method at a pH of 0.4 and 1.5. The synthesised pure TiO2 samples, alongside the commercial TiO2 (Degussa® P25), were also doped with copper via the incipient wetness method. The low pH and the presence of copper inhibited the anatase-rutile transformation. Copper existed in Cu(I) and Cu(II) states in all the doped samples, with the Cu(I) to Cu(II) ratio intimately linked with the anatase to rutile ratio. The UPS data have shown the type II band offset between TiO2 and CuO. The performance of the samples prepared was tested through the reduction of sodium bicarbonate-carbonate buffered at pH > 8. Commercial TiO2 impregnated with Cu demonstrated the highest formate production rate of 173 µmol·g−1·h−1 at pH 11. This study demonstrated the synergetic effect of the anatase-rutile mixture of phases, the reaction pH, and the copper dopant in improving the photocatalytic activity of TiO2.

Type: Article
Title: Investigation of Cu/TiO₂ synthesis methods and conditions for CO₂ photocatalytic reduction via conversion of bicarbonate/carbonate to formate
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jcou.2023.102428
Publisher version: https://doi.org/10.1016/j.jcou.2023.102428
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Titania, ,Band offse, CO2 reduction, Photocatalysis, Copper-doping
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10167411
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