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Photocatalytic Decolorization of Methyl Orange by Silica-Supported TiO2 Composites | ||
| Journal of Ultrafine Grained and Nanostructured Materials | ||
| مقاله 6، دوره 50، شماره 1، شهریور 2017، صفحه 43-50 اصل مقاله (1.24 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.7508/jufgnsm.2017.01.06 | ||
| نویسندگان | ||
| mohammad ghorbanpour* ؛ Mehran Yousofi؛ Samaneh Lotfiman | ||
| Chemical Engineering Department, University of Mohaghegh Ardabili, P.O. Box 56199-11367, Ardabil, Iran. | ||
| چکیده | ||
| Immobilization of TiO2 on silica gel has been proposed to enable easy separation of the catalyst in aqueous systems after photocatalytic reaction. Our simple synthesizing method reduces production cost, and the photocatalyst could find economical application in wastewater treatment. Silica-supported TiO2 composites were prepared by molten salt method at 500, 600 and 700 °C for 60 min. The obtained samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), diffuse reflectance spectroscopy and X-ray fluorescence. SEM results showed a heterogeneous surface covered with spherical particles. According to XRD findings, the only phase of the prepared TiO2/SG nanocomposites at all temperatures was pure anatase. The average crystallite size of anatase was roughly 25, 42, 44 and 53 nm for nanocomposites prepared at 550, 600, 700 and 800 °C, respectively. The samples taken at 500 and 600 ºC showed a band gap value of 2.98 eV, and for sample synthesized at 700 ºC the band gap was 2.95 eV. The decolorization activity has been evaluated by Methyl orange (MO) oxidation in liquid phase. The results showed that the sample obtained at 700 °C had the highest photocatalytic decolorization efficiency activity, and the sample prepared at 500 °C had the lowest. The decolorization activity of photocatalyst prepared at 700 °C did not change during stability experiment. | ||
| کلیدواژهها | ||
| Silica-supported TiO2؛ Nanocomposites؛ molten salt method؛ Photocatalyst | ||
| مراجع | ||
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21. Ghorbanpour M, Falamaki C. A novel method for the fabrication of ATPES silanized SPR sensor chips: Exclusion of Cr or Ti intermediate layers and optimization of optical/adherence properties. Applied Surface Science. 2014;301: 544-50.
22. Ghorbanpour, M and Falamaki, C. A novel method for the production of highly adherent Au layers on glass substrates used in surface plasmon resonance analysis: substitution of Cr or Ti intermediate layers with Ag layer followed by an optimal annealing treatment. Journal of Nanostructure in Chemistry. 2013;3(1), 1-7 .
23. Ghorbanpour, M. Fabrication of a New Amine Functionalised Bi-layered Gold/Silver SPR Sensor Chip. Journal of Physical Science. 2015;26(2): 1–10. | ||
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