Author/Authors :
Javid، Allahbakhsh نويسنده Shahroud University of Medical Sciences , , Nasseri، Simin نويسنده 1Department of Environmental Health Engineering, School of Public Health and Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran , , Mesdaghinia، Alireza نويسنده 1Center for Environmental Research and Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran 2National Institute of Health Research, Ministry of Health, Tehran, Iran , , Mahvi، Amir Hossein نويسنده Department of Environmental Health Engineering, School of Health; National Institute of Health Research; Center for Solid Waste Research, Institute fo , , Alimohammadi، Mahmood نويسنده Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , , Mehdinavaz Aghdam، Rouhollah نويسنده Department of Nanotechnology, Engineering Research Institute, Tehran, Iran , , Rastkari، Noshin نويسنده Center for Air Pollution Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran ,
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 TiO2 nanofiber in the oxidation of the antibiotic tetracycline. TiO2
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 TiO2 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 R2 = 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.
