TY - JOUR
T1 - Fabricated g-C3N4/Ag/m-CeO2 composite photocatalyst for enhanced photoconversion of CO2
AU - Wang, Huiqin
AU - Guan, Jingru
AU - Li, Jinze
AU - Li, Xin
AU - Ma, Changchang
AU - Huo, Pengwei
AU - Yan, Yongsheng
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/3/15
Y1 - 2020/3/15
N2 - In this work, the ordered mesoporous CeO2 (m-CeO2) was successfully fabricated via the nanocasting pathway, through using SBA-15 as a hard template. Besides, g-C3N4/Ag/m-CeO2 composite was successfully constructed by calcination method. Meanwhile, the obtained samples were investigated by series of test techniques. The XRD, SEM and TEM results show that the m-CeO2 and Ag/m-CeO2 with the ordered mesoporous trait. Besides, the EPR, Raman and XPS results suggest that the oxygen vacancies (Ov) and Ce3+ and Ce4+ are in g-C3N4/Ag/m-CeO2. In addition, the ordered mesostructure is favorable for the CO2 molecular movement and adsorption/desorption reaction. The g-C3N4 nanosheets, a promising material possessing suitable conductor band, large specific area, non-toxicity, and outstanding chemical stability, is a candidate semiconductor for CO2 conversion. The introduction of g-C3N4 nanosheets to Ag/m-CeO2 overcomes the photocorrosion of Ag nanoparticles and Ag facilitate the transfer of photogenerated electrons. The photocatalytic activity results show that when the loading of Ag is 7 wt%, the g-C3N4/7Ag/m-CeO2 composite exhibits the superiority activity for CO2 photoconversion to CO (13.94 μmol/g) and CH4 (7.39 μmol/g) under UV-irradiation in 10 h.
AB - In this work, the ordered mesoporous CeO2 (m-CeO2) was successfully fabricated via the nanocasting pathway, through using SBA-15 as a hard template. Besides, g-C3N4/Ag/m-CeO2 composite was successfully constructed by calcination method. Meanwhile, the obtained samples were investigated by series of test techniques. The XRD, SEM and TEM results show that the m-CeO2 and Ag/m-CeO2 with the ordered mesoporous trait. Besides, the EPR, Raman and XPS results suggest that the oxygen vacancies (Ov) and Ce3+ and Ce4+ are in g-C3N4/Ag/m-CeO2. In addition, the ordered mesostructure is favorable for the CO2 molecular movement and adsorption/desorption reaction. The g-C3N4 nanosheets, a promising material possessing suitable conductor band, large specific area, non-toxicity, and outstanding chemical stability, is a candidate semiconductor for CO2 conversion. The introduction of g-C3N4 nanosheets to Ag/m-CeO2 overcomes the photocorrosion of Ag nanoparticles and Ag facilitate the transfer of photogenerated electrons. The photocatalytic activity results show that when the loading of Ag is 7 wt%, the g-C3N4/7Ag/m-CeO2 composite exhibits the superiority activity for CO2 photoconversion to CO (13.94 μmol/g) and CH4 (7.39 μmol/g) under UV-irradiation in 10 h.
KW - Ag particles
KW - CO photoconversion
KW - g-CN nanosheets
KW - Mesoporous CeO
KW - Photocatalytic
UR - http://www.scopus.com/inward/record.url?scp=85076776258&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2019.144931
DO - 10.1016/j.apsusc.2019.144931
M3 - 文章
AN - SCOPUS:85076776258
SN - 0169-4332
VL - 506
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 144931
ER -