Study on structure and molecular scale protection mechanism of green Ce, N-CDs anti-bacterial and anti-corrosive inhibitor

Using L-histidine and cerium nitrate hexahydrate as raw materials, a green and effective carbon dots (Ce,N-CDs) was prepared using hydrothermal synthesis and their structures were confirmed by professional equipment. The anti-bacterial and anti-corrosive behaviors of Ce,N-CDs were systemically evaluated using plate counting method and electrochemical method, respectively. By analysis, the Ce,N-CDs showed a high bacterial inhibition efficiency for Escherichia coli (E. coli), which was up to 94.27 %. Compared with N-doping carbon dots (N -CDs), the Ce,N-CDs exhibited an excellent anti-corrosive ability. At 200 mg/l, its corrosion inhibition efficiency (IE) for Cu was higher than 90 % at different environment temperatures (308, 318, 323 K), and the corrosion rate (WL) was sharply reduced. This was attributed to the presence of N-Cu bond and the formation of Ce-containing passive film. The Ce-containing passive film could block the erosion of aggressive ions. The N-Cu bond could facilitated the chemical adsorption on Cu surface, which was confirmed by quantum chemistry (QC) and molecular dy