Neamsung W.Kitjanukit N.Karawek A.Chongkol N.Lertthanaphol N.Chotngamkhum P.Khumsupa K.Phadungbut P.Jonglertjunya W.Kim-Lohsoontorn P.Srinives S.Mahidol University2025-07-142025-07-142025-01-01Rsc Sustainability (2025)https://repository.li.mahidol.ac.th/handle/20.500.14594/111215Carbon 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.ChemistryEffects of alkanolamines on photocatalytic reduction of carbon dioxide to liquid fuels using a copper-doped dititanate/graphene photocatalystArticleSCOPUS10.1039/d5su00268k2-s2.0-10500990022827538125