Ultrasonically-assisted surface modified TiO2/rGO/CeO2 heterojunction photocatalysts for conversion of CO2 to methanol and ethanol

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dc.contributor.authorSeeharaj, Panpailin
dc.contributor.authorKongmun, Panyata
dc.contributor.authorPaiplod, Piyalak
dc.contributor.authorPrakobmit, Saowanee
dc.contributor.authorSriwong, Chaval
dc.contributor.authorKim-Lohsoontorn, Pattaraporn
dc.contributor.authorVittayakorn, Naratip
dc.date.accessioned2026-08-06T10:26:20Z
dc.date.available2026-08-06T10:26:20Z
dc.date.issued2019-11-01
dc.description.abstractConverting CO<inf>2</inf> to usable fuel may contribute to lowering of global warming, thus this study developed effective heterojunction photocatalysts for the photoreduction of CO<inf>2</inf> with water into methanol and ethanol fuels. The photocatalysts were prepared from combining surface modified titanium dioxide (TiO<inf>2</inf>) nanoparticles with reduced graphene oxide (rGO) and cerium oxide (CeO<inf>2</inf>). The TiO<inf>2</inf> surfaces were firstly modified via the sono-assisted exfoliation, with high intensity ultrasonic waves (ultrasonic horn, 20 kHz, 150 W/cm<sup>2</sup>) in 10 M NaOH for 1 h. Highly reactive nanosheets delaminated from outer surfaces of the primary TiO<inf>2</inf> crystals leading to an increase in specific surface active area, light absorption and decrease in electron-hole recombination rate, which enhanced photocatalytic activity. Then, 0.75 wt% rGO and 1 wt% CeO<inf>2</inf> were incorporated into the surface modified TiO<inf>2</inf> to promote photogenerated charge separation, electron mobility and CO<inf>2</inf> absorptivity. The modified TiO<inf>2</inf>/rGO/CeO<inf>2</inf> photocatalysts exhibited superior photocatalytic performance by producing methanol at 641 μmol/g<inf>cat</inf>h and ethanol at 271 μmol/g<inf>cat</inf>h, almost 7 times higher than rates from pure TiO<inf>2</inf>. The significant improvement in CO<inf>2</inf> photoconversion activity was mainly attributed to the high interfacial contact area and strong connection between the reactive delaminated TiO<inf>2</inf> nanosheets, rGO and CeO<inf>2</inf>, which, in turn, facilitated the flow of large number of photogenerated charge carriers to react with the absorbed species, and the multi-step charge transportation due to the heterojunction effect that effectively retarded electron-hole recombination.
dc.identifier.citationUltrasonics Sonochemistry, 58, 2019
dc.identifier.doi10.1016/j.ultsonch.2019.104657
dc.identifier.issn13504177
dc.identifier.other2-s2.0-85067863785
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/10351
dc.sourceUltrasonics Sonochemistry
dc.subjectCO2 photoconversion
dc.subjectPhotocatalyst
dc.subjectSono-assisted exfoliation
dc.subjectTitanium dioxide
dc.titleUltrasonically-assisted surface modified TiO2/rGO/CeO2 heterojunction photocatalysts for conversion of CO2 to methanol and ethanol
dc.typeArticle

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