纳米 Cu@C 复合材料对水绵生长的抑制作用

In order to explore an efficient way for controlling filamentous green algae blooms，the inhibitory effects and mechanisms of nano-Cu@C composite material on the growth of Spirogyra sp. were studied. The impact of nano-Cu@C on the aquatic environment was also investigated. The results showed that the biomass of Spirogyra and the content of chlorophyll a decreased as the concentration of nano-Cu@C increased from 0 to 40 mg·L^-1，indicating an apparent dosage dependent relationship. The growth inhibition rate of Spirogyra by nano-Cu@C was up to 60%. When the concentration of nano-Cu@C increased to 50 and 60 mg·L^-1，the growth inhibition rate of Spirogyra declined instead. Nano-Cu@C promoted the soluble protein content，catalase activity，and peroxidase activity of Spirogyra cells at low concentrations，while inhibited them at high concentrations. The superoxide dismutase activity of Spirogyra cells was promoted by nano Cu@C to different levels. The relative electric conductivity and malondialdehyde content of Spirogyra cells in each nano-Cu@C exposure group were significantly higher than those in the blank control group（p<0.05）. The substances leaking from Spirogyra cells might increase the total nitrogen，total phosphorus，and permanganate index of the water where Spirogyra was grown. The concentration of Cu²⁺ caused by the dissolution of nano-Cu@C was much lower than that required by the drinking water standard，and the acute biological toxicity of nano-Cu@C was relatively mild. In conclusion，the nano-Cu@C composite material has the application potential in controlling the overgrowth of Spirogyra.