Photodegradation of methylene blue and methyl orange with CuO supported on ZnO photocatalysts: The effect of copper loading and reaction temperature

Synthesis, characterization of novel ZnO/CuO nanoparticles, and the applications in photocatalytic performance for rhodamine B dye degradation

“…The ZnO/CuO system with ratio of Zn/Cu = 45 shows the highest photocatalytic efficiency compared to other Zn/ Cu ratio samples, followed by Zn 10 Cu; the efficiencies of Zn 15 Cu, Zn 20 Cu and Zn 30 Cu were insignificant. The influence of doped Cu content to the photocatalytic performance of ZnO/CuO materials did not follow a rule in the previously published papers (Acedo-Mendoza et al 2020;Harish et al 2017;Kumari et al 2020). Maybe, in the region of Zn/Cu atom ratio = 10÷20, the excess amount of Cu cannot be incorporated in the ZnO host lattice sites, CuO was segregated from the ZnO crystal lattice leading to the new phase, and the photocatalytic behavior in the visible light of ZnO/ CuO system is mainly due to CuO activity, so the higher the Cu content, the higher the photocatalytic efficiency is.…”

“…Among them, the sol-gel method allows the using of a wide selection of solvents, surfactants, and heat treatment, making it easier to control the particle size and shape. For instance, the hollow microsphere with a diameter of approximately 5 μm composed of uniform nanoparticles with a diameter of approximately 20 nm was observed in the work of Chen et al (2020); the quasi-sphere shape with uniform morphologies has been reported (Acedo-Mendoza et al 2020); the hybrid nanocomposite in which CuO nanoparticle is attached to the ZnO-T tetrapod surface (Sharma et al 2020), ZnO nanorod (Patil et al 2019) , nanoflower-like structure (Mardikar et al 2020), nanowires (Chou et al 2017), and thin film (Asikuzun et al 2018) was investigated. The composite of ZnO and CuO was studied with various ratio of Zn/Cu:Cu content with very low Zn/Cu ratio in the range 1000/3÷1000/9 (Singh and Soni 2020), with the mass ratios as 99.9/0.1, 98.0/2.0, and 95.0/5.0 (Ruan et al 2020), or different percentages of Cu in the catalyst of 1, 3, 5, and 10% (Harish et al 2017), event component from 100% Zn to 100% Cu (Lavín et al 2019).…”

Photocatalytic Degradation of Methylene Blue (MB) and Methyl Orange (MO) by the Highly Oxidative Properties of SnO₂–Sb₂O₃ Particles

“…5) These pollutants usually absorb a significant amount of sunlight, thus reducing the development of aquatic species and decreasing dissolved oxygen in the water, further limiting aquatic species. 6) Since most of the colorants contain aromatic rings in their chemical structures, they are hardly biodegradable and even carcinogenic. Therefore, it is important that the wastewater that carries them is correctly treated.…”

Multi-activity cobalt ferrite/MXene nanoenzymes for drug-free phototherapy in bacterial infection treatment

“…MB was utilized to detect the ROS production because it can be degraded by ˙OH. 50 As shown in Fig. 2g , the absorption peaks at 664 nm of the CFO and MXene groups show no apparent changes, demonstrating that CFO and MXene lack the ability to generate ˙OH.…”