Facile synthesis of WO₃ with reduced particle size on zeolite and enhanced photocatalytic activity

Abstract

WO 3 supported on zeolite-Y (WO 3 -ZY) was successfully synthesized by a facile impregnation method and well characterized by various techniques. The photocatalytic activity of the prepared catalysts was investigated for the degradation of Rhodamine B (RhB) under visible, UV and solar light irradiation. The enhanced photocatalytic activity was observed for the catalyst WO 3 -ZY, which may be due to the presence of more active sites that can adsorb a greater number of dye molecules. The TEM, FESEM and adsorption studies confirm that the WO 3 supported on zeolite-Y has a very small particle size of about 8 nm compared with the bare WO 3 at 97 nm. The efficient electron-hole pair separation and the role of active species were investigated by photoluminescence spectroscopy and the test of the effect of scavengers, respectively. The mechanism for the photocatalytic degradation of RhB was proposed and the pathway of RhB degradation was illustrated schematically.

Zinc oxide-palladium material an efficient solar-light driven photocatalyst for degradation of congo red

“…On the other hand, the degradation efficiency decreased at both acidic and basic pH. From that result the photocatalytic degradation of CR is favorable at neutral pH in presence of (ZnO-Pd) N CM [17][18][19].…”

“…A catalyst at higher loading increases the total active sites of the catalyst but dye molecules is constant at fixed concentration. Hence, the optimum amount of catalyst is enough for the efficient degradation of CR at above optimum concentration [17,18].…”

“…At higher dye concentrations, the number of dye molecules is high, but the available active sites on the catalyst surface are constant, hence the fixed catalyst amount occupies a fixed number of active sites. Hence, it is possible to have a constant amount of dye molecule adsorption and degradation and it is not enough to degrade a large number of dye molecules (higher concentration) [16][17][18][19].…”

Potential visible WO3/GO composite photocatalyst

“…Due to very unique physical and chemical properties of WO 3 , it has achieved great scientific interest . Compared with other materials, WO 3 has stable physicochemical properties, strong photo corrosion stability in aqueous solutions, deeper valence band (+3.1 eV), small band gap energy (2.4‐2.8 eV), and very stable recyclability performance …”

WO3 Nanoplates Film: Formation and Photocatalytic Oxidation Studies

“…WO 3 has attracted considerable scientific interest due to its unique chemical and physical properties [8,[10][11][12]. WO 3 possesses many advantages and unique functional properties compared with other semiconducting materials, such as small band gap energy (2.4-2.8 eV), deeper valence band (+3.1 eV), stable physicochemical properties, and strong photocorrosion stability in aqueous solution as well as stable recyclability performance [11][12][13][14].…”