Tetragonal multilayered ZnO/CuO composites derived from Zn- and Cu-containing metal-organic framework: Effect of calcination temperature on physicochemical properties and photocatalytic activity

Engineering S-scheme CuO/ZnO heterojunctions sonochemically for eradicating RhB dye from wastewater under solar radiation

“…The reported values of the conduction band for CuO and ZnO are approximately −0.92 and −0.27 eV, respectively. 43,44,52,57 Likewise, the valence band potentials of ZnO and CuO are positioned at 2.78 and 0.28 eV, respectively. 43,44,52,57 As represented in Fig.…”

“…43,44,52,57 Likewise, the valence band potentials of ZnO and CuO are positioned at 2.78 and 0.28 eV, respectively. 43,44,52,57 As represented in Fig. 9, the Fermi level and the conduction band of CuO are higher than those of ZnO.…”

“…In particular, ZnO is a biocompatible, non-toxic and cost-effective starting material for generating a huge amount of reactive oxygen species and hot charge carriers that expel organic pollutants from wastewater. [17][18][19][20][21][22][23][24][25][26][27][28] The poor solar radiation absorbability, fast electron-hole recombination and slow charge transportation restrict the photocatalytic reactivity of ZnO. To tackle the shortcoming of ZnO single photocatalyst, a heterojunction composed of two different semiconductors with an aligned band gap structure is paid more attention in recent years.…”