Photocatalytic activity and photoinduced hydrophilicity of brookite–heteropolyacid hybrid films

Preparation and Photocatalytic Activity of [PW12O40]3^|^minus;-Grafted Anatase Powder from Selective Leaching of BaTiO3

“…Although this result corresponds to those of previous studies 20) , the degree of improvement is less remarkable. One plausible explanation for this result is a smaller W-Ti ratio (W/Ti = 0.6 ) in the PW12/TiO2 powder than that reported from previous studies 16,17) (commonly a few order). Increasing the PW12 concentration is expected to provide better photocatalytic activity.…”

“…Very recently, Pruethiarenun et al hybridized tungstenbased Keggin-type heteropolyacid (PW12: [PW12O40] 3-) with brookite-type TiO2. Their results revealed that the material exhibited higher photocatalytic decomposition activity and that it had higher photoinduced hydrophilicization rates than pure brookite under UV illumination 16,17) . These results were inferred to have derived from electron scavenging of PW12 and the resultant Z-scheme photocatalytic systems in the material 18,19) .…”

Recent Studies on Heteropolyacid (HPA)/TiO2 Hybrid Photocatalysts

“…Additionally, photoinduced hydrophilicity of the film was faster, and retention of the hydrophilicity after UV illumination improved (Figs. 10 and 11) 20) . Kelvin force microscopy and XPS analysis revealed residual negative charges on the film after UV illumination.…”

“…Recently however, transparent thin films of these hybrid materials have been prepared. Their unique properties such as excellent retention of the hydrophilicity after stopping UV illumination have been reported 20) . This article presents a review of several recent studies that have examined this hybrid material system for use as a photocatalyst.…”

Physicochemical properties and photocatalytic activity of H3PW12O40/TiO2

“…In the first method, an HPA is introduced at some TiO 2 synthesis stage [39,40]; in the second, an HPA as a colloid, suspension, or film is adsorbed onto off the shelf titanium dioxide [38,41]. HPAs were anchored to a TiO 2 film by heat treating the latter at 300°С [42], 350°С [43], and 400°С [44]. In all cases, HPA deposition accelerated the photochemical oxi dation reaction.…”