A synergistic boost of photo-activity of ZnO for photocatalytic degradation of methylene blue by Ag decoration and Fe doping

Fabrication of a Covalent Organic Framework-Based Heterojunction via Coupling with ZnAgInS Nanosphere with High Photocatalytic Activity

“…Furthermore, surface photovoltage spectroscopy (SPV) was performed, which further revealed the separation degree of the charge carriers. 63,64 As shown in Figure 6c, ZnAgInS/COF(5) possesses enhanced SPV signals from 200 to 500 nm in contrast to pure ZnAgInS, indicating that ZnAgInS/COF(5) has a higher charge carrier separation efficiency. The photoluminescence (PL) spectra were recorded to figure out the recombination rate of the photogenerated charge carriers.…”

“…The higher LSV signals of ZnAgInS/COF(5) compared with those of the original ZnAgInS and COF further demonstrate that the separation and transportation efficiencies of the charge carriers were enhanced. Furthermore, surface photovoltage spectroscopy (SPV) was performed, which further revealed the separation degree of the charge carriers. , As shown in Figure c, ZnAgInS/COF(5) possesses enhanced SPV signals from 200 to 500 nm in contrast to pure ZnAgInS, indicating that ZnAgInS/COF(5) has a higher charge carrier separation efficiency.…”

THE EFFECT OF ADDITIONAL IRON SAND ON THE CRYSTAL SIZE AND STRAIN OF ZnO

“…The crystal size of ZF before doping was 25.12 nm, then the crystal size obtained from adding Fe ions (2%, 4%, 8%, and 10%) through the Debye Scherrer equation was 20.03 nm -24.63 nm, which showed a decrease in crystal size. This result is due to an increase in lattice disturbance and strain caused by Fe 2+ substitution, which suppresses the growth of ZnO crystal grains [9,11] and is associated with decreased nucleation and growth rate because the ionic radius of Fe 2+ is higher than that of Zn 2+ ion [9,18]. An increase in crystal size was also observed but not substantially [11].…”

“…ZnO's physical and chemical properties can be modified by including impurities such as metals and non-metals. Various types of metal elements have been used to doped ZnO such as ZnO doped Cu, Fe, Y, Mn, Ni, Ag, showed a hexagonal wurtzite structure, where the distribution of metal ions greadly affects the microstructural properties of material [3][4][5][6][7][8][9]. ZnO nanoparticles will show significant changes in properties when doped with appropriate elements and depending on the synthesis method [10].…”

Ni–Al layered double hydroxide-coupled layered mesoporous titanium dioxide (Ni–Al LDH/LM-TiO2) composites with integrated adsorption-photocatalysis performance

“…For the treatment of industrial wastewater, the traditionally used technologies are mainly chemical, physicochemical, and biological methods, including electrocatalytic degradation, [1][2][3][4] ultrasonic treatment, 5,6 biological occulation, 7,8 adsorption, 9,10 and photocatalytic degradation. [11][12][13][14][15][16] Photocatalytic degradation, namely, photocatalytic oxidation technology, which uses sunlight and simulated natural light as light sources to act on semiconductor catalysts to produce photogenerated electrons and holes, and reacts with O 2 , H 2 O, and other active substances to generate hydroxyl radicals, superoxide radicals, and other active substances, and eventually decomposes pollutants into harmless inorganic small molecules. The commonly used photocatalysts are mainly semiconductor materials, including TiO 2 , [17][18][19] CdS, 20 and ZnO.…”