TY - JOUR
T1 - Photocatalysis of aqueous PFOA by common catalysts of In2O3, Ga2O3, TiO2, CeO2 and CdS : influence factors and mechanistic insights
AU - Fu, Caixia
AU - Xu, Xiuru
AU - Zheng, Chunmiao
AU - Liu, Xinjie
AU - Zhao, Dandan
AU - Qiu, Wenhui
N1 - Funding Information:
This work was supported by the National Key Research and Development Program of China (Grant No. 2021YFA1202500), National Natural Science Foundation of China (Grant No. 42077223), Shenzhen Science and Technology Innovation Committee (JCYJ20190809164201686), State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control (No. 2017B030301012), and Leading Talents of Guangdong Province Program (Chunmiao Zheng).
Funding Information:
We would like thank the China Scholarship Council (CSC) for the financial support (Grant No. 201606890028).
Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Nature B.V.
PY - 2022/9
Y1 - 2022/9
N2 - Gallium oxide (Ga2O3), titanium dioxide (TiO2), cerium dioxide (CeO2), indium oxide (In2O3) and cadmium sulfide (CdS) were commonly used under UV light as photocatalysis system for the pollutants’ degradation. In this study, these five catalysts were applied for the photodegradation of perfluorooctanoic acid (PFOA), a well-known perfluoroalkyl substance (PFAS). As a result, the PFOA photodegradation performance was sequenced as: Ga2O3 > TiO2 > CeO2 > In2O3 > CdS. To further explain the photocatalysis mechanism, the effects of initial pH, photon energy and band gap were evaluated. The initial pH of 3 ± 0.2 hinders the catalytic reaction of CdS, resulting in low degradation of PFOA, while it has no significant effect on Ga2O3, TiO2, CeO2 and In2O3. In addition, quantum yield was sequenced as TiO2 > CeO2 > Ga2O3 > In2O3, which may not be the main factor determining the degradation effect. Notably, the band gap energy from large to narrow was as: Ga2O3 > TiO2 > CeO2 > In2O3 > CdS, which exactly matched their degradation performance.
AB - Gallium oxide (Ga2O3), titanium dioxide (TiO2), cerium dioxide (CeO2), indium oxide (In2O3) and cadmium sulfide (CdS) were commonly used under UV light as photocatalysis system for the pollutants’ degradation. In this study, these five catalysts were applied for the photodegradation of perfluorooctanoic acid (PFOA), a well-known perfluoroalkyl substance (PFAS). As a result, the PFOA photodegradation performance was sequenced as: Ga2O3 > TiO2 > CeO2 > In2O3 > CdS. To further explain the photocatalysis mechanism, the effects of initial pH, photon energy and band gap were evaluated. The initial pH of 3 ± 0.2 hinders the catalytic reaction of CdS, resulting in low degradation of PFOA, while it has no significant effect on Ga2O3, TiO2, CeO2 and In2O3. In addition, quantum yield was sequenced as TiO2 > CeO2 > Ga2O3 > In2O3, which may not be the main factor determining the degradation effect. Notably, the band gap energy from large to narrow was as: Ga2O3 > TiO2 > CeO2 > In2O3 > CdS, which exactly matched their degradation performance.
KW - Band gap energy
KW - Commercial catalysts
KW - Initial pH
KW - Perfluorooctanoic acid
KW - Photogenerated electrons
KW - Photon energy
UR - http://www.scopus.com/inward/record.url?scp=85123234938&partnerID=8YFLogxK
U2 - 10.1007/s10653-021-01127-2
DO - 10.1007/s10653-021-01127-2
M3 - Article
AN - SCOPUS:85123234938
SN - 0269-4042
VL - 44
SP - 2943
EP - 2953
JO - Environmental Geochemistry and Health
JF - Environmental Geochemistry and Health
IS - 9
ER -