The Photocatalytic Conversion of Carbon Dioxide to Fuels Using Titanium Dioxide Nanosheets/Graphene Oxide Heterostructure as Photocatalyst
Issued Date
2023-01-01
Resource Type
eISSN
20794991
Scopus ID
2-s2.0-85146770064
Journal Title
Nanomaterials
Volume
13
Issue
2
Rights Holder(s)
SCOPUS
Bibliographic Citation
Nanomaterials Vol.13 No.2 (2023)
Suggested Citation
Karawek A., Kittipoom K., Tansuthepverawongse L., Kitjanukit N., Neamsung W., Lertthanaphol N., Chanthara P., Ratchahat S., Phadungbut P., Kim-Lohsoontorn P., Srinives S. The Photocatalytic Conversion of Carbon Dioxide to Fuels Using Titanium Dioxide Nanosheets/Graphene Oxide Heterostructure as Photocatalyst. Nanomaterials Vol.13 No.2 (2023). doi:10.3390/nano13020320 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/81729
Title
The Photocatalytic Conversion of Carbon Dioxide to Fuels Using Titanium Dioxide Nanosheets/Graphene Oxide Heterostructure as Photocatalyst
Author's Affiliation
Other Contributor(s)
Abstract
Carbon dioxide (CO2) photoreduction to high-value products is a technique for dealing with CO2 emissions. The method involves the molecular transformation of CO2 to hydrocarbon and alcohol-type chemicals, such as methane and methanol, relying on a photocatalyst, such as titanium dioxide (TiO2). In this research, TiO2 nanosheets (TNS) were synthesized using a hydrothermal technique in the presence of a hydrofluoric acid (HF) soft template. The nanosheets were further composited with graphene oxide and doped with copper oxide in the hydrothermal process to create the copper−TiO2 nanosheets/graphene oxide (CTNSG). The CTNSG exhibited outstanding photoactivity in converting CO2 gas to methane and acetone. The production rate for methane and acetone was 12.09 and 0.75 µmol h−1 gcat−1 at 100% relative humidity, providing a total carbon consumption of 71.70 µmol gcat−1. The photoactivity of CTNSG was attributed to the heterostructure interior of the two two−dimensional nanostructures, the copper−TiO2 nanosheets and graphene oxide. The nanosheets−graphene oxide interfaces served as the n−p heterojunctions in holding active radicals for subsequent reactions. The heterostructure also directed the charge transfer, which promoted electron−hole separation in the photocatalyst.