TY - JOUR
T1 - Remarkable formaldehyde photo-oxidation efficiency of Zn2SnO4 co-modified by Mo doping and oxygen vacancies
AU - Ren, Ziteng
AU - Chen, Bangfu
AU - Li, Yuhan
AU - Carabineiro, Sónia A. C.
AU - Duan, Youyu
AU - Dong, Fan
N1 - info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50006%2F2020/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50006%2F2020/PT#
his work was financially supported by the National Natural Science Foundation of China (Grant No. 51808080), China Postdoctoral Science Foundation (2022M710830), Venture and Innovation Support Program for Chongqing Overseas Returnees (cx2022005), the Natural Science Foundation Project of CQ CSTC (CSTB2022NSCQ-MSX1267), Research Project of Chongqing Education Commission Foundation (KJQN201800826), Science and Technology Research Program of Chongqing Municipal Education Commission of China (KJZD-K202100801), Post-doctoral Program Funded by Chongqing, and Chongqing University Innovation Research Group project (CXQT21023). SACC also acknowledges FCT for the Scientific Employment Stimulus - Institutional Call (CEECINST/00102/2018).
PY - 2023/4/1
Y1 - 2023/4/1
N2 - Formaldehyde (HCHO) is one of the major volatile organic compounds (VOCs) contributing to both urban and indoor air pollution. It is emitted from several industrial activities and construction materials. Photocatalytic oxidation is a green promising technology aiming at HCHO removal. However, it still has some scientific challenges not fully addressed, like insufficient reaction active sites and not enough active species. This results in low HCHO removal efficiency, several toxic intermediates and poor stability. Therefore, the design of photocatalysis with surface-active sites, improved mineralization activity and recycling stability is of crucial importance. Herein, we report a facile one-pot hydrothermal method to prepare Zn2SnO4 (ZSO) with transition metal Mo doping (using Na2MoO4·2H2O as molybdenum source). Our experiments show that Mo is successfully incorporated into the ZSO lattice and contributes to the generation of oxygen vacancies (OVs). Moreover, the introduction of Mo enhances the separation and migration of photogenerated carriers and hinders their recombination. Furthermore, in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density functional theory (DFT) calculations reveal that switching the active sites from O terminals to Mo ones effectively improves adsorption and activation of the target molecules (O2, H2O, and HCHO), and promotes conversion of the reaction intermediates. Thus, ZSO co-modified by Mo doping and oxygen vacancies allows to achieve an efficient HCHO removal activity of 96%, which is much higher than pristine ZSO (21%) and other previously reported photocatalysts.
AB - Formaldehyde (HCHO) is one of the major volatile organic compounds (VOCs) contributing to both urban and indoor air pollution. It is emitted from several industrial activities and construction materials. Photocatalytic oxidation is a green promising technology aiming at HCHO removal. However, it still has some scientific challenges not fully addressed, like insufficient reaction active sites and not enough active species. This results in low HCHO removal efficiency, several toxic intermediates and poor stability. Therefore, the design of photocatalysis with surface-active sites, improved mineralization activity and recycling stability is of crucial importance. Herein, we report a facile one-pot hydrothermal method to prepare Zn2SnO4 (ZSO) with transition metal Mo doping (using Na2MoO4·2H2O as molybdenum source). Our experiments show that Mo is successfully incorporated into the ZSO lattice and contributes to the generation of oxygen vacancies (OVs). Moreover, the introduction of Mo enhances the separation and migration of photogenerated carriers and hinders their recombination. Furthermore, in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density functional theory (DFT) calculations reveal that switching the active sites from O terminals to Mo ones effectively improves adsorption and activation of the target molecules (O2, H2O, and HCHO), and promotes conversion of the reaction intermediates. Thus, ZSO co-modified by Mo doping and oxygen vacancies allows to achieve an efficient HCHO removal activity of 96%, which is much higher than pristine ZSO (21%) and other previously reported photocatalysts.
KW - Formaldehyde removal
KW - Zn2SnO4
KW - Mo doping
KW - Oxygen vacancies
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85149730853&origin=resultslist&sort=plf-t&src=s&st1=10.1016%2fj.seppur.2023.123202&sid=0d288d832059ae0dbc66719c7cca5317&sot=b&sdt=b&sl=33&s=DOI%2810.1016%2fj.seppur.2023.123202%29&relpos=0&citeCnt=1&searchTerm=
U2 - 10.1016/j.seppur.2023.123202
DO - 10.1016/j.seppur.2023.123202
M3 - Article
SN - 1383-5866
VL - 310
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 123202
ER -