Improved photocatalytic activity of ZnO coupled CuO nanocomposites synthesized by reflux condensation method

Synthesis of ZnO/CuO and TiO2/CuO nanocomposites for light and ultrasound assisted degradation of a textile dye in aqueous solution

“…According to the literatures [18][19][20], the catalytic activity of the metal oxide semiconductor catalyst is related to its band gap energy. CuO is a p-type semiconductor with narrow band gap, while ZnO and TiO 2 are n-type semiconductors [21][22][23]. Therefore, in order to form an effective separation and transfer of electrons and holes, a sufficient contact between the components is an important factor.…”

Improve sonocatalytic performance using modified semiconductor catalyst SnO2 and ZrO2 by magnetite materials

“…This is because the energy band gap of TiO2 (~3.2 eV) is smaller than those of SnO2 (~3.8eV) and ZrO2 (~5eV), so the lifetime of generated electron-hole pairs increases and the recombination rate of electrons and holes decreases [21]. The sonocatalytic activity capacity of all nanocomposite samples compared to nanoparticles could be caused by the increased efficiency of separating electron-hole pairs on the nanocomposite [22]. The order of sonocatalytic activity efficiency based on test results is Fe3O4/SnO2 > Fe3O4/ZrO2> SnO2 > Fe3O4/TiO2 >ZrO2 >TiO2.…”

Photocatalytic, sonocatalytic, and photosonocatalytic of Fe3O4/CuO/ZnO nanocomposites with addition of 2 different types of carbon

“…Unfortunately, ZnO has a wide bandgap (3.2 eV) and high recombination of electron and hole [3][4]. Therefore, it is necessary to modify the structural as well as optical properties by coupling ZnO with other semiconductors with short bandgap such as CuO [5].…”