研究目的
To fabricate nonporous NiO–ZnO/TiO2 nanotubes/Ti photocatalyst plates and evaluate their photocatalytic and antimicrobial activities against Escherichia coli and Candida albicans under UV light irradiation.
研究成果
The nonporous NiO–ZnO/TiO2 nanotubes/Ti plates exhibited superior photocatalytic and antimicrobial activities due to enhanced charge separation and reduced electron/hole recombination. The synergetic effect among NiO, ZnO, and TiO2 nanotubes significantly improved performance, making these plates promising for wastewater treatment applications. Future studies should focus on optimizing the fabrication process and exploring applications under visible light.
研究不足
The study is limited to UV light irradiation; visible light applications were not explored. The antimicrobial tests were conducted only on specific microorganisms (E. coli and C. albicans), and the scalability or real-world application of the plates was not addressed. Potential optimization areas include extending to visible light and testing on a broader range of pollutants.
1：Experimental Design and Method Selection:
The study involved fabricating photocatalyst plates using electrochemical methods, including anodic oxidation and electroplating, followed by characterization and antimicrobial testing.
2：Sample Selection and Data Sources:
Ti plates were used as substrates; Escherichia coli bacteria and Candida albicans fungi were sourced from patients.
3：List of Experimental Equipment and Materials:
Equipment included a scanning electron microscope (Philips XL30), X-ray diffractometer, Autolab PGSTAT302N potentiostat, xenon lamp with UV-35 filter, autoclave, ultrasonic bath, and various chemicals such as NiCl2·6H2O, NiSO4·6H2O, ZnCl2, H3BO3, NaOH, glycerol, NH4F, Na2SO4, and agar media.
4：Experimental Procedures and Operational Workflow:
Ti plates were polished, anodized at 20 V for 2 h in glycerol/water/NH4F electrolyte, annealed at 450°C for 2 h, electroplated with Ni-Zn alloy under specified conditions, treated with NaOH for de-zincification, and calcined at 300°C for 2 h. Antimicrobial tests involved exposing microorganism suspensions to the plates under UV light, sampling at intervals, diluting, plating on agar, incubating, and counting colonies.
5：Data Analysis Methods:
Data were analyzed using SEM, XRD, EDX, photocurrent responses, EIS, and colony counting methods to assess structural properties, electrochemical behavior, and antimicrobial efficiency.
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