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g-C3N4 quantum dots-modified mesoporous CeO2 composite photocatalyst for enhanced CO2 photoreduction.
- Source :
- Journal of Materials Science: Materials in Electronics; 2020, Vol. 31 Issue 22, p20495-20512, 18p
- Publication Year :
- 2020
-
Abstract
- g-C<subscript>3</subscript>N<subscript>4</subscript> quantum dots (CN QDs)-decorated mesoporous CeO<subscript>2</subscript> composite photocatalyst was prepared by hydrothermal method. The characterized results exhibit that the CN QDs are successfully coupled with mesoporous CeO<subscript>2</subscript>, and the photoelectronic response is effectively enhanced. The photocatalytic activity was tested by CO<subscript>2</subscript> reduction, and the results showed that when the loading of CN QDs was 0.75 wt%, the composite photocatalyst has the best photocatalytic activity. After 10 h of UV irradiation, the yields of CO and CH<subscript>4</subscript> were 22.48 µmol/g and 15.81 µmol/g, respectively. Some of the electrons generated within m-CeO<subscript>2</subscript> participated in the CO<subscript>2</subscript> reduction reaction and some were transferred to CN QDs through the two-phase interface to participate in the CO<subscript>2</subscript> catalytic reaction. The oxygen vacancies in m-CeO<subscript>2</subscript> can adsorb CO<subscript>2</subscript> and the introduced CN QDs can excite more oxygen vacancies with m-CeO<subscript>2</subscript> heterostructure, thereby adsorbing more CO<subscript>2</subscript> and photoreduction electrons. [ABSTRACT FROM AUTHOR]
- Subjects :
- QUANTUM dots
CARBON dioxide
PHOTOREDUCTION
ELECTRONS
PHOTOCATALYSTS
Subjects
Details
- Language :
- English
- ISSN :
- 09574522
- Volume :
- 31
- Issue :
- 22
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science: Materials in Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 147480149
- Full Text :
- https://doi.org/10.1007/s10854-020-04568-0