A Z-scheme mechanism of the novel ZnO/CuO n-n heterojunction for photocatalytic degradation of Acid Orange 7

Highly efficient and selective photocatalytic CO2 reduction using MIL-125(Ti) and based on LiFePO4 and CuO QDs surface–interface regulation

“…The bandgap ( E g ) of semiconductors is calculated as follows: 47 αhv = A ( hv − E g ) n /2 where α is the absorption coefficient, h is the Planck constant, ν is light frequency, E g is bandgap energy, and A is a constant. MIL-125(Ti), 2.5-L/1-C@M, CuO, and LiFePO 4 have direct transitions, 48–50 where n = 1. Fig.…”

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

“…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). The previous work indicated that the ZnO/CuO composite showed a better photocatalytic efficiency than the ZnO.…”

“…Kavita Sahu et al (Sahu et al 2020) founded that the formation of p-n 2D CuO-ZnO hybrid nanoheterojunctions enhanced the photogenerated charge carrier separation, so that they exhibited excellent photocatalytic decomposition for methylene blue (MB), methylene orange (MO), and 4 nitrophenol (4-NP) under sunlight radiation. Ruan et al (2020) indicated that the ZnO/CuO n-n heterojunction photocatalysts, electron on the conduction band (CB) of ZnO, move to the valence band (VB) of CuO by the electrostatic attraction, and form electrons in the CB of CuO and holes in the VB of ZnO, respectively. Thus, the recombination of the electrons and hole pairs was reduced on the surface of ZnO, and the photocatalytic activity of ZnO/CuO for Acid Orange 7 under the solar light was improved compared to pure ZnO.…”

Magnetic Graphene Nanosheets from Expired Iron-Supplemented Tablets for Hydroxyl-Mediated Photocatalytic Oxidation of Azo Dyes

“…Then, the photocatalyst was dried in a water bath and used for another cycle. 70 m-GNS shows recyclability up to six cycles, with a % dye degradation efficiency of ∼70%, as shown in Figure 6b.…”