期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 623, 期 -, 页码 445-455出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.04.169
关键词
Algal inactivation; Oxidative stress; Z-scheme heterojunction; hollow tubular g-C3N4
资金
- National Natural Science Foundation of China [52100008, 52100142, 52100184]
- National Key Research and Development Pro-gram of China [2021YFC1910400]
- Science and Technology Innovation Program of Hunan Province, China [2021RC2056]
- China Postdoctoral Science Foundation [2021 M701149]
- National Nature Science Foundation of Hunan province, China [2021JJ40091]
A novel Z-scheme heterojunction tubular photocatalyst, Ag2O@PG, was synthesized and demonstrated efficient algal inactivation under visible light. The optimal algae inactivation efficiency of 99.1% was achieved using Ag2O@PG-0.4 at a dosage of 0.2 g/L. The study also investigated the mechanism of its effect on algal cells. Moreover, the potential application of Ag2O@PG-0.4 in real algal bloom environments was validated.
The design of a photocatalyst for efficient algal inactivation under visible light is essential for the application of photocatalysis to the control of harmful algal blooms. In this study, a novel Z-scheme heterojunction tubular photocatalyst, Ag2O@PG, was synthesized by chemically depositing silver oxide compounded with P-doped hollow tubular graphitic carbon nitride for the photocatalytic inactivation of Microcystis aeruginosa (M. aeruginosa). The photocatalytic algal inactivation experiments showed that the photocatalytic activity of Ag2O@PG was influenced by the ratio of the composition of the obtained materials. The optimal algal inactivation efficiency was observed when using Ag2O@PG-0.4 at a dosage of 0.2 g/L. It was able to achieve a 99.1 % M. aeruginosa inactivation at an initial concentration of 4.5 x 10(6) cells/mL following 5 h' visible light irradiation. During the process, the cell membrane permeability and cell morphology changed. Furthermore, under the constant attack of superoxide radicals and holes caused by Ag2O@PG, the superoxide dismutase, glutathione and malondialdehyde of algae cells increased during the experiments to alleviate oxidative damage. Eventually, the antioxidant system of algae cells was destroyed. To further validate the potential application of Ag2O@PG-0.4 in real algal bloom environment, an experiment in real water samples was carried out. Overall, the Ag2O@PG-0.4 as an efficient photocatalyst has a promising potential for emergency treatment measures to alleviate algal blooms. (C) 2022 Elsevier Inc. All rights reserved.
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