TY - JOUR
T1 - Oxygen vacancies-induced photoreactivity enhancement of TiO2 mesocrystals towards acetone oxidation
AU - Li, Yuhan
AU - Wu, Xiaofeng
AU - Duan, Youyu
AU - Huang, Zeai
AU - Fan, Jiajie
AU - Carabineiro, Sónia A. C.
AU - Lv, Kangle
N1 - Funding Information:
info:eu-repo/grantAgreement/FCT/CEEC INST 2018/CEECINST%2F00102%2F2018%2FCP1567%2FCT0001/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50006%2F2020/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50006%2F2020/PT#
This work was supported by the National Natural Science Foundation of China ( 51672312 & 51808080 ), the Fundamental Research Funds for the Central Universities, South-Central Minzu University ( CZP22001 ), Research Project of Chongqing Education Commission Foundation (KJQN201800826)
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/8/30
Y1 - 2022/8/30
N2 - In this study, TiO2 mesocrystal assemblies of ultrathin TiO2 nanosheets with (0 0 1) facets were prepared by a microwave-assisted solvothermal method using tetrabutyl titanate (TBT), NH4F and acetic acid. The relationship between calcination temperature (300–1000 °C) and photocatalytic activity towards acetone oxidation was systematically studied. It was found that fluoride ions adsorbed on the surface were removed after calcination, generating surface oxygen vacancies (Ov). The 600 °C-calcined sample (T600) exhibited the highest photocatalytic activity towards acetone oxidation, which was 4.9 times higher than the activity of pristine TiO2 mesocrystals. The formation of Ov not only improved the ability of light absorption, stimulated the charge carrier separation, enhanced the photocatalytic activity, but also prevented the growth of TiO2 mesocrystals, by retarding the fusion of the neighboring TiO2 mesocrystals, increasing anatase-to-rutile phase transformation temperature to values above 1000 °C.
AB - In this study, TiO2 mesocrystal assemblies of ultrathin TiO2 nanosheets with (0 0 1) facets were prepared by a microwave-assisted solvothermal method using tetrabutyl titanate (TBT), NH4F and acetic acid. The relationship between calcination temperature (300–1000 °C) and photocatalytic activity towards acetone oxidation was systematically studied. It was found that fluoride ions adsorbed on the surface were removed after calcination, generating surface oxygen vacancies (Ov). The 600 °C-calcined sample (T600) exhibited the highest photocatalytic activity towards acetone oxidation, which was 4.9 times higher than the activity of pristine TiO2 mesocrystals. The formation of Ov not only improved the ability of light absorption, stimulated the charge carrier separation, enhanced the photocatalytic activity, but also prevented the growth of TiO2 mesocrystals, by retarding the fusion of the neighboring TiO2 mesocrystals, increasing anatase-to-rutile phase transformation temperature to values above 1000 °C.
KW - Acetone
KW - Fluorine
KW - Oxygen vacancy
KW - Photocatalytic oxidation
KW - TiO mesocrystals
UR - http://www.scopus.com/inward/record.url?scp=85129297017&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2022.153519
DO - 10.1016/j.apsusc.2022.153519
M3 - Article
AN - SCOPUS:85129297017
SN - 0169-4332
VL - 594
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 153519
ER -