Synthesis And Antibacterial Activity Of Cu₂O/Biochar Composites

Cuprous oxide has important application in the field of marine antifouling.Nowadays, nano cuprous oxide has attracted much attention for its excellent features,such as surface effect, small size effect, quantum size effect and so on. However,micro/nano cuprous oxide particles are easy to aggregate and have poor stability.Choosing the appropriate carrier to load the cuprous oxide has proven to be an effective method to improve the characteristic of cuprous oxide. In addition, although there are a lot of reasearch on the morphology, particle size and crystal face of the factor of cuprous oxide on antibacterial activity, there are no unified conclusions.Thus, they need further research.(1)In this study, flower like, spherical and cubic cuprous oxide were prepared by simple chemical precipitation method and solvent hot method. The conclusion that the higher specific surface area of cuprous oxide the better antibacterial performanceof cuprous oxide will be, was drowed by the characterization analysis of XRD, FE-SEM and BET and their antibacterial activity to Escherichia coli (E. coli). The direct contact antibacterial mechanism has also been bolstered at the same time,(2)The difference of corn stover, distilers' grains, sweet potato vine and soybean straw being used as raw material to prepare biochar and the influence of temperature on biochar preparation has been explored. The Cu2O/biochar composites were prepared by simple chemical precipitation method and the optimal condition of preparationof them were explored. The optimal conditions are: the load is 40%, add CuSO4 first then add NaOH, the ratio of NaOH and CuSO4 is 2:1 and the ratio of ascorbic acid is 1:1. The composites were characterized by XRD,FE-SEM,TG and BET. The antibacterial activity of Cu2O/biochar composites was compared with pure Cu2O nanoparticles through MIC, the growth curve of E. coli and so on. The results showed that the Cu2O/biochar composites were more effective and had superior antibacterial performance than pure Cu2O nanoparticles.This study provides a theoretical basis for its application in marine antifouling coatings.