g-C 3 N 4 quantum dots-modified mesoporous CeO 2 composite photocatalyst for enhanced CO 2 photoreduction
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g-C3N4 quantum dots-modified mesoporous CeO2 composite photocatalyst for enhanced CO2 photoreduction Haopeng Jiang1,2
, Xin Li3
, Songtao Chen1,2,*
, Huiqin Wang4,*
, and Pengwei Huo3
1
Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, People’s Republic of China College of Municipal and Environmental Engineering, Henan University of Urban Construction, Pingdingshan 467000, People’s Republic of China 3 Institute of Green Chemistry and Chemical Technology, School of Chemistry & Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China 4 School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China 2
Received: 28 June 2020
ABSTRACT
Accepted: 29 September 2020
g-C3N4 quantum dots (CN QDs)-decorated mesoporous CeO2 composite photocatalyst was prepared by hydrothermal method. The characterized results exhibit that the CN QDs are successfully coupled with mesoporous CeO2, and the photoelectronic response is effectively enhanced. The photocatalytic activity was tested by CO2 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 CH4 were 22.48 lmol/g and 15.81 lmol/g, respectively. Some of the electrons generated within m-CeO2 participated in the CO2 reduction reaction and some were transferred to CN QDs through the two-phase interface to participate in the CO2 catalytic reaction. The oxygen vacancies in m-CeO2 can adsorb CO2 and the introduced CN QDs can excite more oxygen vacancies with m-CeO2 heterostructure, thereby adsorbing more CO2 and photoreduction electrons.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Recently, the use of photocatalytic technology to convert CO2 into energy fuel has been regarded as a promising way to alleviate the energy crisis and global warming [1–3]. The photocatalytic conversion of CO2 mainly depends on the semiconductor-
dominant photocatalysts. CeO2 is an important rare earth oxide with the advantages of high melting and high boiling point, good chemical stability, and nontoxicity [4–6]. What is more, it is easy to form Ce3? and Ce4? pairs in metal oxides because Ce atom has the unique 4f electron orbit, which is more conducive to electron transfer [7, 8]. CeO2 is an alkaline oxide,
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https://doi.org/10.1007/s10854-020-04568-0
J Mater Sci: Mater Electron
which is good for adsorbing CO2. However, a single CeO2 has the shortcomings of tiny particle size, small specific surface area, and fast carrier recombination rate, which is not beneficial to the photocatalytic reduction of CO2 [9–12]. Therefore, it is necessary to design a composite material with high specific surface area to improve its catalytic performance. The different morphologies of CeO2, which possess higher catalytic performance, have been widely co
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