title: Enhancement of photocatalytic degradation of furfural and acetophenone in water media using nano-TiO2-SiO2deposited on cementitious materials.
abstract: 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 TiO2and TiO2-SiO2were 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 CO2and 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.
authors.affiliation: College of Chemistry, Iran University of Science and Technology, Narmak PO Box 16844-13114, Tehran, Iran E-mail: hoda.jafari@gmail.com.
authors.forename: Sahar
authors.initials: S
authors.lastname: Soltan
authors.affiliation: College of Chemistry, Iran University of Science and Technology, Narmak PO Box 16844-13114, Tehran, Iran E-mail: hoda.jafari@gmail.com.
authors.forename: Hoda
authors.initials: H
authors.lastname: Jafari
authors.affiliation: College of Chemistry, Iran University of Science and Technology, Narmak PO Box 16844-13114, Tehran, Iran E-mail: hoda.jafari@gmail.com.
authors.forename: Shahrara
authors.initials: S
authors.lastname: Afshar
authors.affiliation: Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216, Australia.
authors.forename: Omid
authors.initials: O
authors.lastname: Zabihi
mesh_terms: D000098:Acetophenones / Q000737:chemistry*; D002384:Catalysis; D005662:Furaldehyde / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D062065:Wastewater; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D000098:Acetophenones; D005662:Furaldehyde; D012822:Silicon Dioxide; D014025:Titanium; D062065:Wastewater; D014867:Water; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C038699:acetophenone