CAPABILITY OF Cu20 NPs/DIATOMITE MATERIAL IN GROWTH INHIBITION AND REMOVAL OF Microcystis aeruginosa IN AQUACULTUTE CULTIVATION

Abstract

The application of nano materials in disinfection has been considered as a promising technology in the world. However, high cost is one of the main disadvantages of this method. Therefore, the investigation of new nanoparticles with high efficiency and cheap is target of scientists. In this study, Cu2O nanoparticles (Cu2O NPs) with an average particle size of ~27.4 nm deposited on diatomite (Cu2O NPs/diatomite), a new low-cost material was used for growth inhibition and bloom prevention of cyanobacteria in eutrophic waters. Diatomite collected from natural mines was used in the experiments. Microcystis aeruginosa strain originated from Bac Lieu shrimp pond was isolated and cultured in Z8 medium. Experiments were conducted by exposing M. aeruginosa to Cu2O NPs/diatomite and diatomite at concentrations of 0.1, 0.2 and 0.5 g/L for 72 and 120 h, respectively. The investigation results showed that Cu2O NPs/diatomite could remove M. aeruginosa cells much more efficiently than diatomite. The straight line equation obtained from linear relationship between Cu2O NPs/diatomite concentration and the inhibition growth rate percentage (IGR) showed that at a concentration of 0.115 g/L, this nano material could inhibit 100 % of M. aeruginosa in the culture medium after 72 h. Hence Cu2O NPs/diatomite was recommended as a promising material for removing cyanobacterial bloom in aquaculture cultivation.