Novel Photocatalytic Ag/TiO₂ Thin Film on Polyvinyl Chloride for Gaseous BTEX Treatment

Abstract

This study aims to provide the photocatalytic approach for treatment of some hazard air pollutants such as benzene, toluene, ethylbenzene and xylene (BTEX) under visible light. Silver doped titanium dioxide (Ag/TiO2) thin films with various molar ratios (0.01, 0.05, 0.1 and 0.2 mol) were synthesized via sol-gel method and dipped on polyvinyl chloride (PVC) sheet before curing with UV lamp. The X-ray diffractograms showed the composite of TiO2anatase and nanosilver. The effect of silver doping on decreasing of band gap energy of TiO2was observed from the absorption edge shift to higher wave length, analyzed by UV-visible spectrometer. The results from hydrophilicity test indicated that hydrophilicity of TiO2thin film was increased by doping silver. The morphology of the Ag/TiO2thin film studied by Scanning Electron Microscope equipped with an Energy Dispersive Spectrometer revealed well dispersed nanosilver on the smooth thin film. The BTEX degradation was carried out in a batch reactor with the initial concentration of mixed BTEX gas [25 ppm]. The remaining BTEX was examined by Gas Chromatography equipped with flame ionization detector. Among Ag/TiO2thin films, the 0.1 Ag/TiO2thin films exhibited the best performance for gaseous BTEX degradation under visible light. The maximum degradation efficiency was belong to xylene (89%), followed by ethylbenzene (86%), toluene (83%) and benzene (79%).

Reduction of Peroxide Value and Free Fatty Acid Value of Used Frying Oil Using TiO2 Thin Film Photocatalyst

“…In our research, annealed thin film had plate-like morphology that represent larger surface. Large surface of thin film was potential to adsorb much frying oil [29]. This produced more hydrogen radical and hydrocarbon radical that reacted with the degradation products.Annealing treatment also lead to increase Ti 3+ concentration in the lattice of TiO2.…”

Transparent TiO2 thin films with high photocatalytic activity for indoor air purification

“…It has been found that with modification of TiO 2 the conversion of toluene under VIS light was in the range 35–80%, while for pure TiO 2 the conversion was below 10%. 17–24 The incorporation of doping components into the TiO 2 lattice results in the formation of new mid-gap energy states, promoting the absorption of VIS light. 17–22…”

“…17–24 The incorporation of doping components into the TiO 2 lattice results in the formation of new mid-gap energy states, promoting the absorption of VIS light. 17–22…”

“…13,16 The loss in photocatalytic performance in the case of thin lms compared to nanopowders can be effectively compensated for by using a convenient deposition technique, selecting suitable substrates and properly tuning preparative conditions. 12 In order to increase the VIS light activity of a TiO 2 photocatalyst, several strategies, such as doping with vanadium, 17 silver, 18 nitrogen 19 or composite materials such as TiO 2 /ZrO 2 20 and TiO 2 /carbon, [21][22][23] have been applied. It has been found that with modication of TiO 2 the conversion of toluene under VIS light was in the range 35-80%, while for pure TiO 2 the conversion was below 10%.…”

Magnetron Sputtering Deposition of Ag/TiO2 Nanocomposite Thin Films for Repeatable and Multicolor Photochromic Applications on Flexible Substrates

“…[15][16][17] Recently, some authors elaborated Ag/TiO 2 thin fi lms on polyethylene terephalate (PET) sheets by sol-gel processes without damaging the substrate. [ 18,19 ] Some others authors prepared Ag/ TiO 2 nanocomposites by magnetron sputter deposition without addressing their photochromic properties. [20][21][22] Zuo et al used radio frequency (RF) sputtering of a TiO 2 polycrystalline and an Ag target on p-type Si wafers at room temperature.…”