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Performance of Photocatalytic Oxidation of Tetracycline in Aqueous Solution by TiO2 Nanofibers

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Author(s): Allahbakhsh Javid | Simin Nasseri | Alireza Mesdaghinia | Amir hossein Mahvi | Mahmood Alimohammadi | Rouhollah Mehdinavaz Aghdam | Noshin Rastkari

Journal: Iranian Journal of Environmental Health Science & Engineering
ISSN 1735-1979

Volume: 11;
Issue: 8;
Start page: 24;
Date: 2013;
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Keywords: Antibiotic | Photocatalytic | Response Surface Methodology | TiO2Nanofibers | Tetracycline

ABSTRACT
The presence of pharmaceutical compounds in water and soil has become an environmental concern. The aim of this study was to evaluate the performance of TiO 2 nanofiber in the oxidation of the antibiotic tetracycline. TiO 2 nanofiber was fabricated by electro-spinning method, and then was calcined at 560?C for 2 h. Central composite design (CCD) statistic model was used to optimize tetracycline concentration, time and pH for TiO 2 catalyst. A tubular Pyrex glass reactor with diameter of 15 cm and height of 30 cm was designed and a 125W Philips HPLN lamp (UV, ? > 254 nm) was used as light source. Samples were measured by high-performance liquid chromatography (HPLC). Equation of model suggests a direct relationship between pH and time with efficiency of tetracycline removal. The observations indicated that time is the most significant (scaled estimate = + 28.04) parameter in efficiency of tetracycline removal. The application of response surface methodology yielded the equation of Y?=?65.82?+?5.74?pH?+?28.04 time?+?(?3.07)(pH) 2 ?+?(?6.6)(time) 2 , with R 2 = 0.986 which represents good reliability of model. Based on the response surface plots optimum conditions for degradation of tetracycline with maximum efficiency of around 95% was attained. These conditions are as follow; concentration: 50 mg/l, pH= 8.3, time= 15 min.

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