Effects of alcohols as sacrificial reagents on a copper-doped sodium dititanate nanosheets/graphene oxide photocatalyst in CO<inf>2</inf> photoreduction
Issued Date
2024-09-02
Resource Type
eISSN
20462069
Scopus ID
2-s2.0-85203142641
Journal Title
RSC Advances
Volume
14
Issue
38
Start Page
27980
End Page
27989
Rights Holder(s)
SCOPUS
Bibliographic Citation
RSC Advances Vol.14 No.38 (2024) , 27980-27989
Suggested Citation
Kitjanukit N., Neamsung W., Karawek A., Lertthanaphol N., Chongkol N., Hiramatsu K., Sekiguchi T., Pornsuwan S., Sakurai T., Jonglertjunya W., Phadungbut P., Ichihashi Y., Srinives S. Effects of alcohols as sacrificial reagents on a copper-doped sodium dititanate nanosheets/graphene oxide photocatalyst in CO<inf>2</inf> photoreduction. RSC Advances Vol.14 No.38 (2024) , 27980-27989. 27989. doi:10.1039/d4ra04585h Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/101176
Title
Effects of alcohols as sacrificial reagents on a copper-doped sodium dititanate nanosheets/graphene oxide photocatalyst in CO<inf>2</inf> photoreduction
Author's Affiliation
Corresponding Author(s)
Other Contributor(s)
Abstract
Carbon dioxide (CO2) photoreduction is an intriguing approach that converts CO2 into high-value substances with the assistance of a photocatalyst. Key to effective photoreduction is to promote the interaction of photo-induced holes and a sacrificial reagent (SCR), separating the holes from photoelectrons and enhancing the rate of the subsequent product generation. Methanol, ethanol, isopropanol, and water SCRs were tested for their ability to assist a copper-doped sodium dititanate nanosheets/graphene oxide heterostructure (CTGN) in CO2 photoreduction. The CTGN photocatalyst was suspended in a CO2-saturated aqueous solution with the assigned SCR while illuminated by a mercury lamp. Product samples from the gas and liquid phases were analyzed for targeted product compositions. Methanol SCR exhibited the best performance in facilitating CO2 photoreduction, producing ethanol as the main product at a total carbon consumption (TCC) of 6544 μmol gcat−1. The remarkable performance of methanol is attributed to the high diffusivity and excellent stability of the hydroxymethyl radical that developed during the photoreduction. The kinetics studies revealed the first and second order for the CO2 depletion and product generation rates, respectively, for the alcohol SCRs.