Fabrication of ZnFe2O4 films and its application in photoelectrocatalytic degradation of salicylic acid

Visible light catalysis of methyl orange using nanostructured WO3 thin films

“…The initial experiments show that MO does not undergo any degradation under direct visible light illumination in the absence of WO 3 photocatalysts. The same degradation experiment also performed in presence the of WO 3 photocatalyst without visible light irradiation and it is found, there is a slight decrease in extinction peaks of MO over WO 3 photocatalyst, this is may be due to adsorption loss of electrolyte through circulation pipe and degradation reactor [48]. This observations confirms that there is no redox reaction take place on the surface of semiconductor photocatalyst without light.…”

Oxidative degradation of salicylic acid by sprayed WO3 photocatalyst

“…The initial experiments were carried out under direct UV illumination without WO 3 photoelectrode and it does not show any degradation of salicylic acid. Although in presence of WO 3 photo electrode under dark condition, the extinction peaks of salicylic acid slightly decrease, this may be due to the adsorption loss of electrolyte through circulation tube and photoelectrochemical reactor [42]. Fig.…”

“…5d shows the COD spectra of 1 mM salicylic acid solution as a function of degradation time which are analyzed for extent of degradation. [42], and N:TiO 2 [46], etc. have been used for the degradation of SA and corresponding degradation efficiency obtained was 45, 49, and 97%, respectively.…”

Photoelectrocatalytic degradation of methyl red using sprayed WO3 thin films under visible light irradiation

“…Upon illumination of semiconductor with light energy equal to or higher than the band gap energy, charge separation is induced resulting the formation of charge carriers. The photoelectron can be easily trapped by electronic acceptors like adsorbed O 2 , and form a superoxide radical anion ( Á O -2 ), whereas the photo-induced holes can be easily trapped by such as organic pollutants, to further oxidize them [9]. In organic pollutants oxidation reactions Á OH radicals, which are nonselective strong oxidizing agents reacting with the pollutant [27].…”

“…Among these the advanced oxidation processes (AOP) have proved to be effective for the degradation of organic pollutants. Photocatalytic degradation is one of the very important methods to remove toxic organic compounds from the waste water [9]. In recent years, a lot concentration has been focused on the semiconductor photocatalyst as environmental friendly photocatalyst for the degradation of organic contaminants in water.…”