Co_(3)O_(4)-Zn复合镀层制备及其模拟酶催化防污活性研究

Preparation of Co_(3)O_(4)-Zn Composite Coating and Its Simulated Antifouling Activity of Enzymes Catalyst

将具有过氧化物酶催化活性的Co_(3)O_(4)纳米颗粒通过电沉积的方法与锌基体共沉积获得了新型的Co_(3)O_(4)-Zn金属镀层,在Co_(3)O_(4)和锌基体的共沉积过程中引入了超声波和油酸钠,在此过程中,超声波和油酸钠有力地促进了Co_(3)O_(4)在共沉积表面的分散和吸附。通过SEM、XRD、电化学测试等表征手段证明Co_(3)O_(4)以有效的结构复合到Zn基体中,而油酸钠的加入则有效地增加了Co_(3)O_(4)-Zn镀层中Co_(3)O_(4)的负载量。此外,还用大肠杆菌、金黄色葡萄球菌和铜绿假单胞菌3种典型污损细菌评估了Co_(3)O_(4)-Zn镀层的抗菌性能。Co_(3)O_(4)-Zn镀层对这3种细菌的抑制率超过98%,显示出高度和广谱的抗菌性能。研究还证明,Co_(3)O_(4)-Zn镀层在具有H2O_(2)情况下会产生超氧自由基和羟基自由基,它们在抗菌过程中起着主导的作用。最后还对复合镀层的抗菌稳定性和耐腐蚀特性进行了验证,表明复合镀层表现出良好的抗菌稳定和耐腐蚀特点。该研究结果为模拟酶催化杀菌金属基镀层的发展提供了新的可能,也为涉海设备的防污措施提供了一种新的思路。

Nanoparticles Co_(3)O_(4) with peroxidase catalytic activity were co-deposited with Zn by electrodeposition to obtain a novel Co_(3)O_(4)-Zn composite coating on Q235 carbon steel.Ultrasound and sodium oleate(NaoI)were introduced during the co-deposition of Co_(3)O_(4) and Zn,which strongly promoted dispersion and adsorption of Co_(3)O_(4) on the co-deposited surface coating.The characterization by SEM and XRD revealed that Co_(3)O_(4) was obviously dispersed into the Zn matrix.The addition of NaoI effectively increased the deposited amount of Co_(3)O_(4) in the Co_(3)O_(4)-Zn coatings.Besides,the antimicrobial performance of the Co_(3)O_(4)-Zn coatings was evaluated with three typical fouling bacteria,namely,Escherichia coli(E.coli),Staphylococcus aureus(S.aureus),and Pseudomonas aeruginosa(P.aeruginosa).Results showed that the coverage of these three bacteria on Co_(3)O_(4)-Zn coatings decreased over 98%,illustrating that the Co_(3)O_(4)-Zn coatings showed high and broad-spectrum antimicrobial performance.It was also found that the Co_(3)O_(4)-Zn coating in the presence of hydrogen peroxide(H2O_(2))produced superoxide radicals(·O_(2)^(-))and hydroxyl radicals(·OH),which played dominant roles in the antimicrobial process.Finally,the antimicrobial stability and corrosion resistance of the composite coatings were also verified,and it was found that the composite coatings exhibited good antimicrobial stability and corrosion resistance characteristics.The results of this study provide a new possibility for the development of bactericidal coatings of simulated enzyme catalyst and a new solution for green antifouling.