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Ultrahigh photoactivity of ZnO nanoparticles for decomposition of high-concentration microcystin-LR in water environment

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Abstract

Use of highly photoactive materials is critical for applicability of photocatalysis in large-scale water treatment facilities. Unfortunately, in a real setting, the performance of existing photocatalysts is not as good as expected. Therefore, finding a truly photoactive material is of great importance. Herein, ZnO nanoparticles prepared through a simple solid-state route at moderate temperatures in the absence of oxygen are demonstrated to be a suitable option for environmental photocatalysis. Within only 8 min of UVA irradiation at pH 6, the degradation efficiency for 2 mg/L of microcystin-LR using 0.5 g/L of ZnO synthesized at 350 °C reaches as high as 97%. Hydroxyl radicals and valence band holes are found to be responsible for such a high degradation of microcystin-LR. The photocatalytic activity can also be maintained after six successive uses.

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Acknowledgements

This work is supported by Ton Duc Thang University, Vietnam.

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Correspondence to H. Sudrajat.

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Editorial responsibility: Binbin Huang.

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Sudrajat, H., Babel, S. Ultrahigh photoactivity of ZnO nanoparticles for decomposition of high-concentration microcystin-LR in water environment. Int. J. Environ. Sci. Technol. 16, 695–706 (2019). https://doi.org/10.1007/s13762-018-1690-2

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