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Open AccessArticle

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

College of Civil Engineering, Fuzhou University, Fujian 350116, China
IER Environmental Protection Engineering Technology Co., Ltd., Shenzhen 518071, China
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;
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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