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Open AccessArticle

Inhibitory Effects of Cu2O/SiO2 on the Growth of Microcystis aeruginosa and Its Mechanism

1
College of Civil Engineering, Fuzhou University, Fujian 350116, China
2
IER Environmental Protection Engineering Technology Co., Ltd., Shenzhen 518071, China
3
School of Urban Planning and Design, Shenzhen Graduate School, Peking University, Shenzhen 518055, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1669; https://doi.org/10.3390/nano9121669
Received: 16 October 2019 / Revised: 15 November 2019 / Accepted: 17 November 2019 / Published: 22 November 2019
In this study, a novel nanomaterial Cu2O/SiO2 was synthesized based on nano-SiO2, and the inhibitory effects of different concentrations of Cu2O/SiO2 on the growth of Microcystis aeruginosa (M. aeruginosa) were studied. At the same time, the mechanism of Cu2O/SiO2 inhibiting the growth of M. aeruginosa was discussed from the aspects of Cu2+ release, chlorophyll a destruction, oxidative damage, total protein, and the phycobiliprotein of algae cells. The results showed that low doses of Cu2O/SiO2 could promote the growth of M. aeruginosa. When the concentration of Cu2O/SiO2 reached 10 mg/L, it exhibited the best inhibitory effect on M. aeruginosa, and the relative inhibition rate reached 294% at 120 h. In terms of the algae inhibition mechanism, Cu2O/SiO2 will release Cu2+ in the solution and induce metal toxicity to algae cells. At the same time, M. aeruginosa might suffer oxidative damage by the free radicals, such as hydroxyl radicals released from Cu2O/SiO2, affecting the physiological characteristics of algae cells. Moreover, after the addition of Cu2O/SiO2, a decrease in the content of chlorophyll a, total soluble protein, and phycobiliprotein was found, which eventually led to the death of M. aeruginosa. Therefore, Cu2O/SiO2 can be used as an algaecide inhibitor for controlling harmful cyanobacteria blooms. View Full-Text
Keywords: harmful cyanobacteria; Cu2O/SiO2; hydroxyl radical; antioxidant enzyme harmful cyanobacteria; Cu2O/SiO2; hydroxyl radical; antioxidant enzyme
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MDPI and ACS Style

Fan, G.; Bao, M.; Wang, B.; Wu, S.; Luo, L.; Li, B.; Lin, J. Inhibitory Effects of Cu2O/SiO2 on the Growth of Microcystis aeruginosa and Its Mechanism. Nanomaterials 2019, 9, 1669.

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