Effects of alkanolamines on photocatalytic reduction of carbon dioxide to liquid fuels using a copper-doped dititanate/graphene photocatalyst
Issued Date
2025-01-01
Resource Type
eISSN
27538125
Scopus ID
2-s2.0-105009900228
Journal Title
Rsc Sustainability
Rights Holder(s)
SCOPUS
Bibliographic Citation
Rsc Sustainability (2025)
Suggested Citation
Neamsung W., Kitjanukit N., Karawek A., Chongkol N., Lertthanaphol N., Chotngamkhum P., Khumsupa K., Phadungbut P., Jonglertjunya W., Kim-Lohsoontorn P., Srinives S. Effects of alkanolamines on photocatalytic reduction of carbon dioxide to liquid fuels using a copper-doped dititanate/graphene photocatalyst. Rsc Sustainability (2025). doi:10.1039/d5su00268k Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/111215
Title
Effects of alkanolamines on photocatalytic reduction of carbon dioxide to liquid fuels using a copper-doped dititanate/graphene photocatalyst
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Abstract
Carbon dioxide (CO<inf>2</inf>) photoreduction is a promising alternative to carbon capture, utilization, and storage (CCUS) technologies. It relies on photocatalysts to convert CO<inf>2</inf> to high-value products. The copper-doped dititanate nanosheets/graphene oxide composite (CTGN) is a heterostructure of two 2-dimensional nanomaterials: nanosheets and graphene oxide (GO), exhibiting outstanding photoactivity. It was demonstrated to assist in CO<inf>2</inf> photoreduction, yielding fuel products such as methanol, ethanol, and isopropanol. In this study, we used CTGN as a photocatalyst model to investigate the effects of alkanolamines, including monoethanolamine (MEOA), diethanolamine (DEOA), and triethanolamine (TEOA), in facilitating CO<inf>2</inf> photoreduction. TEOA performed the best, producing methanol, ethanol, isopropanol, acetone, and n-butanol with an impressive total carbon consumption (TCC) of 7890 μmol g<inf>cat</inf><sup>−1</sup>. Alkanolamines exhibited a dual function as a sacrificial agent (SCR) and a CO<inf>2</inf>-capturing substance for photoreduction. TEOA was an excellent SCR and captured CO<inf>2</inf> loosely via base-catalyzed hydration, promoting the subsequent release of CO<inf>2</inf> for photoreduction. A study on medium pH revealed a decreased photoreduction rate at increased pH due to a strong bond between CO<inf>2</inf> and the alkali solution, which reduces the reaction rate.