Journal
APPLIED SURFACE SCIENCE
Volume 509, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144773
Keywords
Porous ZnO nanosheets; g-C3N4 nanofilms; Core/shell structure; Photocatalytic CO2 reduction
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Funding
- National Natural Science Foundation of China [21276190, 20806059]
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Porous ZnO nanosheets (PNS-ZnO) were prepared by calcining ZnS(en)(0.5) (en = ethylenediamine) nanosheets in air, and g-C3N4 (g-CN) nanofilms were coated on the surface of PNS-ZnO by thermal deposition using bulk g-C3N4 as precursor. Experimental results showed that the graphene-like g-C3N4 could be deposited on the surface of ZnO to form nanocomposites with core/shell structure. After the loading of g-CN, the light absorption and chemical adsorption of CO2 over PNS-ZnO were improved obviously and the recombination of photogenerated electron and hole was greatly depressed due to the formation of heterojunction between PNS-ZnO and g-CN. All PNS-ZnO@g-CN nanocomposites exhibited much higher photocatalytic activity for CO2 reduction with H2O vapor when compared to pure PNS-ZnO and bulk g-CN. The loading amount of g-CN had significant influence on the light absorption and photocatalytic activity, and PNS-ZnO@g-CN-0.4 exhibited the best photocatalytic performance, for which H-2, CH4 and CO production rates of 22.7, 30.5 and 16.8 mu mol/g(cat)/h can be obtained, respectively.
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