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In this study, a novel nanomaterial Cu 2 O/SiO 2 was synthesized based on nano-SiO 2 , and the inhibitory effects of different concentrations of Cu 2 O/SiO 2 on the growth of Microcystis aeruginosa ( M. aeruginosa ) were studied. At the same time, the mechanism of Cu 2 O/SiO 2 inhibiting the growth of M. aeruginosa was discussed from the aspects of Cu 2+ release, chlorophyll a destruction, oxidative damage, total protein, and the phycobiliprotein of algae cells. The results showed that low doses of Cu 2 O/SiO 2 could promote the growth of M. aeruginosa . When the concentration of Cu 2 O/SiO 2 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, Cu 2 O/SiO 2 will release Cu 2+ 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 Cu 2 O/SiO 2 , affecting the physiological characteristics of algae cells. Moreover, after the addition of Cu 2 O/SiO 2 , 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, Cu 2 O/SiO 2 can be used as an algaecide inhibitor for controlling harmful cyanobacteria blooms.

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