228 / 2022-02-15 15:38:23

Study on Photocatalytic and Antibacterial Properties of Nano-ZnO Composite Coating Prepared by Plasma Spraying-Chemical Vapor Deposition

ZnO composite coating, plasma spraying-chemical vapor deposition (PS-CVD), photocatalytic degradation, antibacterial properties

Mineral Materials and Advanced Energy Materials > 9.Environment Functional Materials

It has always been an important issue for researchers to explore environmentally friendly materials that can degrade organic pollutants and fight bacteria. In this paper, an efficient and environmentally friendly method for the preparation of porous Nano-ZnO composite coatings by plasma spray-chemical vapor deposition is reported. With this method, ZnO/Ag/Zn composite coatings were chemically vapor deposited on the stainless steel substrate using a self-made Zn@ (ZnO/Ag) core-shell powder as raw materials and plasma jet as heat source. The coating has a cauliflower-like microstructure with particle sizes ranging from 40 nm to 60nm. It is found that the size of coating nanoparticles decreases with the increase of spraying power and spraying distance. The ratio of ZnO:Zn in the coating increases with increasing spraying power or decreasing spraying distance. When the spraying power was 31.5kW and spraying distance was 100 mm, the photocatalytic degradation rate was the fastest and the efficiency was the highest (87.5%). The prepared composite coating has good antibacterial performance, and the antibacterial performance with light is better than that under dark condition. Under simulated sunlight, the MIC and MBC are 50 and 50 μg/mL for S. aureus, and 400 and1600 μg/mL for E. coli, respectively.