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Sustainable Fabrication of ZnO-Based Photocatalysts for Light-Driven Degradation of Organic Dyes
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DOI：10.1142/S1793292026500852.png)
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Abstract
En 中文
Pure ZnO and Ni-doped ZnO nanoparticles with Ni concentrations of 5wt.%, 10wt.% and 15wt.% were successfully synthesized and systematically investigated for their optical, photocatalytic and antibacterial properties. UV-Vis diffuse reflectance analysis revealed a gradual narrowing of the optical band gap with increasing Ni content, indicating modification of the electronic structure due to dopant induced defect states. The photocatalytic activity was evaluated through methylene blue degradation under light irradiation, where 15wt.% Ni@ZnO exhibited the highest degradation efficiency, showing a lower normalized concentration value of 0.53 after 80min compared with 0.56 for pure ZnO. Kinetic analysis confirmed pseudo-first-order behavior, with the apparent rate constant increasing from 2.82 & times; 10-3min-1 for pure ZnO to 3.06 & times; 10-3min-1 for 15wt.% Ni@ZnO, along with an improved correlation coefficient R2 of 0.9707. Antibacterial studies conducted using the agar well diffusion method demonstrated a pronounced enhancement in bactericidal performance with Ni doping. The maximum zones of inhibition were observed for 15wt.% Ni@ZnO, measuring 16mm against Staphylococcus aureus and 15mm against Vibrio spp., compared with 9mm and 8mm for pure ZnO, respectively. The enhanced photocatalytic and antibacterial activities are attributed to improved charge separation, increased reactive oxygen species generation and stronger interactions with bacterial cell membranes induced by Ni incorporation. These findings establish Ni-doped ZnO as an efficient multifunctional material for environmental remediation and antimicrobial applications.
Keywords:
Photocatalytic
green synthesis
ZnO NPs
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