Abstract
In this study, a visible-light-driven P25 TiO2 was prepared upon surface modification with a colored organic hybrid of phosphotungstic acid that makes titanium dioxide suitable for photocatalytic degradation of organic pollutants under visible and sunlight irradiation. Visible shifting of the photocatalytic activity of surface-modified TiO2 was examined by studying the decolorization of methylene blue (MB) and rhodamine B (RhB). The results show that colored TiO2 is, unlike bare TiO2, a good photocatalyst in the degradation of dyes under visible and sunlight irradiation. Surface-modified Al2O3 and reduced graphene oxide (RGO) with organic hybrid of phosphotungstate failed to degrade RhB under sunlight irradiation, which prove the role of TiO2 in the photochemical process.
Highlights
The major limitation of P25 TiO2 as a photocatalyst is its poor efficiency in the visible region of the solar spectrum due to wide band gap of 3.2 eV, which typically requires exposure of ultraviolet (UV) light for photocatalytic reactions
The findings show that the advantage of the present photocatalyst is the shift of the photocatalytic activity toward the visible region, and it shows the photocatalytic behavior under a visible light source in addition to sunlight
P25 TiO2 was coated with PTA-HMT-methylene blue (MB) hybrid
Summary
The major limitation of P25 TiO2 as a photocatalyst is its poor efficiency in the visible region of the solar spectrum due to wide band gap of 3.2 eV, which typically requires exposure of ultraviolet (UV) light for photocatalytic reactions. The photocatalytic application of TiO2 at an industrial scale has been limited because only 4-5% of the solar spectrum corresponds to UV photons. Strong efforts have been devoted to activating the TiO2 toward the visible and solar light for application purposes [1, 2]. The coating of P25 TiO2 with a colored organic hybrid of POMs has not been reported yet. The hybridization and immobilization onto P25 TiO2 resolve high solubility and poor recyclability of POMs and facilitate separation because coated TiO2 is not suspended in the solution
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