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Enhancement of photocatalytic degradation of furfural and acetophenone in water media using nano-TiO₂-SiO₂deposited on cementitious materials

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journal contribution
posted on 2016-10-01, 00:00 authored by S Soltan, H Jafari, S Afshar, Omid ZabihiOmid Zabihi
In the present study, silicon dioxide (SiO2) nanoparticles were loaded to titanium dioxide (TiO2) nano-particles by sol-gel method to make a high porosity photocatalyst nano-hybrid. These photocatalysts were synthesized using titanium tetrachloride and tetraethyl orthosilicate as titanium and silicon sources, respectively, and characterized by X-ray powder diffraction (XRD) and scanning electron microscope methods. Subsequently, the optimizations of the component and operation conditions were investigated. Then, nano-sized TiO2 and TiO2-SiO2 were supported on concrete bricks by the dip coating process. The photocatalytic activity of nano photocatalysts under UV irradiation was examined by studying the decomposition of aqueous solutions of furfural and acetophenone (10 mg/L) as model of organic pollutants to CO2 and H2O at room temperature. A decrease in the concentration of these pollutants was assayed by using UV-visible absorption, gas chromatography technique, and chemical oxygen demand. The removal of these pollutants from water using the concrete-supported photocatalysts under UV irradiation was performed with a greater efficiency, which does not require an additional separation stage to recover the catalyst. Therefore, it would be applicable to use in industrial wastewater treatment at room temperature and atmospheric pressure within the optimized pH range.

History

Journal

Water science and technology

Volume

74

Pagination

1689-1697

Location

London, Eng.

Open access

  • Yes

ISSN

0273-1223

eISSN

1996-9732

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Issue

7

Publisher

IWA Publishing