Title: TiO2 and WO3/TiO2 thin films for photocatalytic wastewater treatment

Authors: Adel Ben Youssef; Meriem Laamari; Latifa Bousselmi

Addresses: Laboratory of Waste Water Treatment, Center of Water Researches and Technologies, Technopark Borj Cedria, BP 273, 8020 Soliman, Tunisia ' Laboratory of Waste Water Treatment, Center of Water Researches and Technologies, Technopark Borj Cedria, BP 273, 8020 Soliman, Tunisia ' Laboratory of Waste Water Treatment, Center of Water Researches and Technologies, Technopark Borj Cedria, BP 273, 8020 Soliman, Tunisia

Abstract: Tungsten trioxide (WO3) influence as a doping agent was studied in order to improve Titanium dioxide (TiO2) photocatalytic efficiency under sunlight. Hydrolysis at low temperature, followed by dialysis and chemical reactive sputtering, has been applied to synthesise thin films. Morphological investigations were performed by X-ray diffraction (DRX) and atomic force microscopy (AFM). Gap energies were determined from transmission spectra (TS), a solar photocatalytic reactor was used to study photodegradation efficiency. The adhesion strength was performed by scratch test. Doping TiO2 by WO3 decreases the energy gap of the film; consequently an increase of photocatalytic activity under solar radiation is achieved. The degradation test under sunlight showed an efficiency of 10.37 mg m−2h−1 in the case of the non-doped film. However, the 5 wt% WO3 doped film had a degradation efficiency of 17.87 mg m−2h−1. The scratch test performed to the 5 wt% WO3 doped film has determined a critical load value of 2.6 N.

Keywords: photocatalysis; WO3/TiO3; wastewater; pulverisation; scratch test.

DOI: 10.1504/IJEWM.2019.101282

International Journal of Environment and Waste Management, 2019 Vol.24 No.2, pp.151 - 160

Available online: 02 Jul 2019 *

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