Synthesis of Visible-Light-Activated Yellow AmorphousTiO2Photocatalyst

Abstract

Visible-light-activated yellow amorphousTiO2(yam-TiO2) was synthesised by a simple and organic-free precipitation method. TiN, an alternative precursor forTiO2preparation, was dissolved in hydrogen peroxide under acidic condition(pH∼1)adjusted by nitric acid. The yellow precipitate was obtained after adjusting pH of the resultant red brown solution to 2 withNH4OH. The BET surface area of this sample was 261 m2/g. The visible light photoactivity was evaluated on the basis of the photobleaching of methylene blue (MB) in an aqueous solution by using a 250 W metal halide bulb equipped with UV cutoff filter (λ>420 nm) under aerobic conditions. Yam-TiO2exhibits an interesting property of being both surface adsorbent and photoactive under visible light. It was assigned to theη2-peroxide, an active intermediate form of the addition ofH2O2into crystallinedTiO2photocatalyst. It can be concluded that an active intermediate form of titanium peroxo species in photocatalytic process can be synthesised and used as a visible-light-driven photocatalyst.

Preparation of Nano-TiO<sub>2</sub> Thin Film Using Spin Coating Method

“…Also, this could also be inferred from the increment, 4.28 and 4.30 eV observed respectively on the ITO films. These results are also in agreement with the values reported by [13,14,[16][17][18].…”

“…The smaller particle size of the synthesized TiO 2 makes its XRD pattern looks rougher than the XRD Pattern of the commercially available TiO 2 powder. Reducing the particle size further to about 10 nm will cause the TiO 2 to show amorphous pattern [12][13][14]. Figure 5 shows the comparison trend among the optical transmittance plots of the polyethylene oxide (PEO), synthesized and commercially available TiO 2 solution.…”

Green synthesis of mesoporous anatase TiO2nanoparticles and their photocatalytic activities

“…The reduction in the degradation efficiency aer 10 catalytic cycles, can be explained by the material loss during the recovering procedure because of the difficulty to avoid any loss of catalyst materials during the washing and ltration process. [32][33][34][35] Aer ten cycles of reusability test, TiO 2 NPs were analysed using XRD and FESEM to determine its phase, porosity and morphology stability. Fig.…”

Photonic Band Gap and Bactericide Performance of Amorphous Sol-Gel Titania: An Alternative to Crystalline TiO2

“…Amorphous-TiO 2 has raised great interest in the academic community, in which a set of a-TiO 2 applications has been proved: as a high performance photocatalyst [12,13], as dye sensitizer [14] or electrode [15] in solar batteries, as thin film in capacitors [16], in resistive random access memory applications [17], as a self-cleaning agent due to its super-hydrophylicity [18,19,20], or to purify dye-polluted water [21]. Recent applications include anodes for sodium ion rechargeable batteries [22], low temperature oxygen sensors [23], visible light photocatalysts [13,24], or biomedical applications [25,26].…”

“…Recent applications include anodes for sodium ion rechargeable batteries [22], low temperature oxygen sensors [23], visible light photocatalysts [13,24], or biomedical applications [25,26]. …”