Inhibitory Effects of Cu(2)O/SiO(2) on the Growth of Microcystis aeruginosa and Its Mechanism

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.