The light fandango: Anatase and anatase–rutile composite TiO2 has been modified electronically with highly dispersed surface iron oxide species. The chemisorption–calcination cycle technique was used with [Fe(acac)3] as a precursor (acac=acetylacetonate), leading to pronounced visible‐light activity and a concomitant increase in activity under illumination with UV light (cb=conduction band, vb=valence band).

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A novel multi-gelation method to prepare TiO 2 nano-particle photocatalysts showed good performance in controlling the important parameters determining the photocatalytic reactivity, i.e., the particle size, surface area, crystallinity, pore-volume, porediameter as well as the anatase and rutile phase composition of the catalysts. In particular, this method at higher pH swing times could prevent the phase transition from anatase to rutile, leading to higher photocatalytic activity. By adopting variations in the pH swing, the TiO 2 nano-particle photocatalysts showed significantly higher photocatalytic reactivity for the complete oxidation of 2-propanol diluted with water into CO 2 and H 2 O. It can be considered a viable alternative method for the preparation of high performance TiO 2 nano-particle photocatalysts for widespread commercial applications KEY WORDS: TiO 2 photocatalysts; multi-gelation method; photocatalytic degradation of 2-propanol.

TiO2 photocatalysts, prepared by a multi-gelation method, showed higher photocatalytic activity for the degradation of 2-propanol diluted in water. This multi-gelation method showed a good performance in controlling the parameters viz. particle size, surface area, crystallinity as well as anatase and rutile phase composition, which are responsible for the higher activity of these photocatalysts.

Abstract-TiO 2 photocatalysts were prepared by a multi-gelation method and the effect of the changes in the pH during the pH swing times, i.e., by a controlled pH swing, on the morphology of the TiO 2 particles was investigated. The photocatalytic properties of the TiO 2 catalysts prepared by controlled pH swing were compared with TiO 2 particles prepared without adjusting the pH during the swing times. The photocatalytic degradation reaction of these TiO 2 catalysts was investigated by comparing their effectiveness in 2-propanol oxidation. The experimental results showed that the TiO 2 photocatalysts prepared without adjusting the pH performed better in controlling the important parameters of the catalysts such as particle size, surface area, anatase/rutile phase ratio and pore size, as well as pore volume than the TiO 2 photocatalysts prepared by a controlled pH swing method.