ZnO/CuO nanostructures anchored over Ni/Cu tubular films via pulse electrodeposition for photocatalytic and antibacterial applications

Green synthesis of copper oxide nanoparticles using Ephedra Alata plant extract and a study of their antifungal, antibacterial activity and photocatalytic performance under sunlight

“…This might be caused by a decline in the crystalline quality and perhaps even a reduction in the average crystallite size of the chemically produced particles ( Fig. 2 ), which would lead to a decrease in the photocatalytic degradation of MB [ 50 ]. The enhanced rate of reduction by the biosynthesized CuO-NPs is attributed to the transitional redox potential between the donor and the acceptor over the electron moving process [ 69 , 70 ].…”

“…The dye can be directly oxidized by holes due to their high oxidation potential, which leads to reactive intermediates that can be degraded [ 72 , 73 ]. Furthermore, the free MB molecules absorb solar radiation, which allows their excitation and functions as a catalyst for the degradation of MB molecules [ 50 , [74] , [75] , [76] ]. The photocatalytic degradation mechanism of CuO-NPs based methylene blue dye irradiated by sunlight was presented in a previous work [ 77 ] and is described below:

Fig.

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“…The catalytic reactivity of CuO nanostructures is influenced by their form and exposed crystal planes. Therefore, the structurally controlled synthesis of CuO structures may help develop novel structures with the needed improved performance [ 49 , 50 ]. Many researchers have been interested in using copper oxide nanoparticles as agents with antimicrobial activity against Gram-positive and Gram-negative bacteria as well as anti-fungal activity.…”

“…Karuppannan, S.K. et al have reported that the Cardiospermum halicacabum aqueous extract-mediated synthesized CuO-NPs were examined under Gram-positive bacteria and MB dye was degraded by 93% in about 210 min [ 50 ]. In this work, we report on a simple, cost-effective, and green synthesis of CuO-NPs using the plant extract Ephedra alata for environmental, biological, and agricultural applications.…”

Developing efficient CuO nanoplate/ZnO nanoparticle hybrid photocatalysts for methylene blue degradation under visible light

“…This result agrees with the above-mentioned PL spectra and other studies, which indicated that the ZnO-to-CuO ratio plays an important role in the photocatalytic process. 63,77 Table 1 compares the photocatalytic efficacy of some previously reported CuO/ZnO systems.…”