期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 9, 期 5, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106133
关键词
Electrospinning; Heterojunction; Photocatalyst; Cu2O; Ag
资金
- National Natural Science Foundation of China [21777105]
- Shenzhen Science and Technology Foundations [JCYJ20180507182040308, JCYJ20170818101 137960]
Electrospun TiO2@Ag@Cu2O nanofibers photocatalyst exhibits excellent visible light catalytic degradation performance, achieving a degradation efficiency of 99% for methylene blue within two hours. The combination of surface plasmon resonance effect of Ag and Z-scheme heterojunction structure contributes to the enhanced efficiency of the photocatalyst.
Electrospinning has become a universal and direct method for the preparation of nanofibers with rich porosity and large specific surface area. In this work, the Z-scheme heterojunction TiO2@Ag@Cu2O nanofibers photocatalyst was prepared via electrospinning and showed excellent visible light catalytic degradation performance with the obtained degradation efficiency of methylene blue as high as 99% within two hours. The main active compounds for the photocatalytic degradation of the dye methylene blue were superoxide radical (center dot O-2(-)) and hydroxyl radicals (center dot OH) as well as H+. Compared to pure TiO2, following its combination with Cu2O for visible light absorption, the recombination rate of the photogenerated electron-hole pairs was reduced. After Ag doping, due to the strong surface plasmon resonance absorption effect of Ag, a red shift occurs during the pyrolysis process, showing an outstanding contribution to the effective use of sunlight. Electrochemical test results showed that a Z-scheme hybrid structure was formed in the TiO2@Ag@Cu2O nanofibers. The photocurrent density of TiO2@Ag@Cu2O nanofibers was 3.78 times higher than that of TiO2@Cu2O nanofibers and 47.6 times higher than that of TiO2 nanofibers. The Z-scheme heterojunction not only improved the visible light absorption efficiency, but also separated and transferred carriers, effectively preventing the recombination of photogenerated carriers. Therefore, we believe that TiO2@Ag@Cu2O nanofibers photocatalyst advances the development of photocatalysis technology and is promising for use in a broad range of applications in environmental remediation.
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