Thermodecomposition synthesis of WO3/H2WO4 heterostructures with enhanced visible light photocatalytic properties

Synthesis of Ag3PO4 using Hydrophylic Polymer and Their Photocatalytic Activities under Visible Light Irradiation

“…The Ag3PO4 synthesized using PEG showed the absorption band edge shift to the lower wavelength (blue shift). The band gaps of the samples were calculated from the DRS using the equation of direct transition semiconductor [10,12] as presented in Equation (1): (1) where α, ν, Eg, and A are absorption coefficient, light frequency, band gap energy, and a constant, respectively. The band gap of 2.35, 2.32, 2.37, and 2.35 eV could be observed in Ag3PO4, Ag3PO4/PVA, Ag3PO4/PEG, and Ag3PO4/PVP, respectively (Table 1).…”

“…Figure 4 shows the photocatalytic activities of Ag3PO4 synthesized without and with hydrophylic polymer of PVA, PEG and PVP. The rate constants are evaluated by the following apparent pseudo-first-order kinetics equation [10,12,13] as depicted in Equation (2). (2) where C0 and C are the concentrations of dye in solution at times 0 and t, respectively, and kapp is the apparent pseudo-first-order rate constant (min −1 ).…”

ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

“…The photoluminsecence (PL) emission spectra can supply meaningful information about semiconductor materials such as surface oxygen or metal vacancies, the efficiencies of charge carrier migration and transfer, and it is quite helpful to understand the recombination rate of electron-hole pairs in semiconductor as PL emission arises from the recombination of free carriers [70,71]. Fig.…”

“…9 presents the PL spectra of the as-prepared samples. Colloidal ZnO QDs (spectrum a) exhibits a strong green emission located at 530 nm mainly caused by oxygen vacancy defects [72][73][74]. The pure TiO 2 inverse opal structure (spectrum b) gives a strong PL signal in the range of 400-450 nm, with four obvious PL peaks at about 442, 460, 493 and 525 nm, respectively, possibly the first one mainly resulting from band edge free excitons and the fourth one mainly from binding excitons [75,76].…”

Conversion of dimethyl ether to toluene under an O2 stream over W/HZSM-5 catalysts

“…3.6 Catalytic mechanism of DME to toluene over W/HZSM-5 and delocalized hydrogen-bonded groups (3500 cm −1 ) of lattice defects, the partially hydrolyzed framework Al (around 3660 cm −1 ) and the band of 3338 cm −1 can be ascribed to the OH stretching associated with W species, 33,34 As for the View Article Online adsorption spectra, they show typical DME adsorption bands with a C-O-C stretching vibration at 1100-1200 cm −1 , a C-H stretching vibration at 2800-3000 cm −1 and a C-H deformation vibration at about 1400-1600 cm −1 . In addition, the bands that appear at 900-1000 cm −1 can be ascribed to the heterocyclic -C-O-C-asymmetric stretching.…”