Journal
RSC ADVANCES
Volume 6, Issue 90, Pages 87446-87453Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra13464e
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Funding
- National Natural Science Foundation of China [11674048]
- Fundamental Research Funds for the Central Universities [N150505001, N140505004]
- Liaoning Natural Science Foundation [2015021009]
- Program for New Century Excellent Talents in University [NCET-13-0112]
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Ultrafast degradation of organic pollutions has been realized by the piezo-photocatalytic activity of Ag2O/tetrapod-ZnO nanostructures under ultrasonic/UV exposure. Tetrapod-ZnO (T-ZnO) nanostructures are synthesized in mass production by a thermal evaporation method, and Ag2O nanoparticles are uniformly loaded on the whole surface of T-ZnO nanostructures. Under both ultrasonic and UV exposure, Ag2O/TZnO nanostructures can efficiently co-use the mechanical and UV energy to degrade organic pollutions, and the degradation speed is extraordinarily fast. Taking methylene blue (MB) as an example, Ag2O/TZnO nanostructures (2 g L-1) can completely degrade an MB aqueous solution (5 mg L-1) within similar to 2 min under ultrasonic (200 W) and UV (50 W) exposure. Such a degradation rate is much higher than previous results, and has potential applications in sewage treating techniques at the industrial level. In this process, the piezoelectric field of T-ZnO nanostructures and the build-in electric field of Ag2O/T-ZnO heterojunctions can separate the photogenerated electron-hole pairs, lowering the recombination rate and enhancing the photocatalytic activity. The present results can promote the development of sewage treating techniques for environmental improvement.
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