Zinc oxide with the morphology of nanopillar is promising marine antifouling materials as they can kill adhered bacteria and fungi. The zinc oxide with the morphology of nanopillar has shown super-antibacterial properties on galvanized steel , which makes ZnO/Zn nanopillar films promising in marine antifouling and antimicrobial corrosion. Thus, an efficient approach to coat ZnO/Zn nanopillar films on steel is of great significance. The electrodeposition method is a universal method for both ZnO crystals and galvanized coatings, and it can control the morphologies and structures of the resultant films. Therefore, in this study, capsaicin was added into an alkaline electrolyte to induce the formation of ZnO nanopillars. Due to capsaicin addition to the electrolyte, ZnO/Zn nanopillar films were obtained in a single cathodic electrodeposition. The added capsaicin in the electrolyte was absorbed on the electrodepositing surface by the functional –NH– groups in amide bond. The Zn(OH) 4 2− diffusion was promoted by negatively shifted electrodepositing potential. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) results illustrate that regular ZnO nanopillars were obtained when the capsaicin concentration was 0.6 g L −1 in the electrolyte. The resultant ZnO/Zn nanopillar films showed high antibacterial properties in Escherichia coli suspended solutions and relatively low living bacterial coverage, indicating promising application in marine antifouling. Electrochemical evaluation revealed that the obtained capsaicin-induced ZnO/Zn nanopillar films exhibited significantly enhanced corrosion resistance in a sulfate-reducing bacteria (SRB) medium. Moreover, the results illustrate that adding 0.6 g L −1 concentration of capsaicin in the electrolyte yielded the best films, which featured the lowest bacterial coverage and highest corrosion resistance.
Bamboo, as a potential ecological building material, has attracted a lot of attention, due to its wide distribution, more than 1000 species, short growth cycle of 3–5 years, three times the carbon dioxide adsorption of other plants, and tensile strength comparable to steel or concrete. The major challenges of bamboo are the single color and poor anti-microbial corrosion, based on the intrinsic nature of polysaccharides such as cellulose. In this work, a novel bamboo composite material that exhibits a rich variety of colors (red wine, light yellow, coffee, white, black), excellent color retention, and anti-microbial corrosion for 14 days under a relative humidity of 60–95% is prepared by an easy-to-scale chemical grafting method. Oxidation treatment is the basic condition for bamboo to obtain bright colors, and the substitution reaction of the carbon heterocyclic ring of polysaccharide molecules is the inherent reason for bamboo dyeing. For instance, the bamboo treated with nitric acid presents a bright red wine color, and C=N, –NO 2 functional groups are detected. Polyethylene glycol filled in the three-dimensional network avoids the water-soluble nutrients from emigrating to the surface of bamboo. The interruption of the continuous supply route allows the modified bamboo to obtain excellent antibacterial performance. Bright color and anti-microbial corrosion characteristics make the modified bamboo as a green building material has more potential applications. Graphical abstract
危险品化学品经营许可证（带存储）