1 دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، شهر جدید سهند، تبریز
2 مرکز تحقیقات راکتور و کاتالیست، دانشگاه صنعتی سهند، شهر جدید سهند، تبریز
عنوان مقاله [English]
Photocatalytic wastewater treatment as an important member of advanced oxidation processes with a high energy efficiency plays important role in wastewater treatment. This method is known as an energy efficient method because of solar light utilization availability. In this work, TiO2 nano-photocatalyst has been synthesized using titanium IV butoxide as a Ti precursor. Then, the nitrogen doping has been carried out to activate its photocatalytic activity in the visible part of the light spectrum. N-TiO2 nano-photocatalysts has been synthesized using a hybrid method of hydrothermal-microwave. The analyses of XRD, FESEM, BET, EDX and UV-vis spectroscopy have been carried out to evaluate the physicochemical and optical properties of the catalysts. The XRD analysis has confirmed the successful synthesis of the TiO2 with anatase crystaline phase. FESEM images have confirmed the nano-sized structure of the catalysts. The BET suface area coincided the FESEM results by representation of surface area enhancement after doping with nitrogen. EDX resulted the presense of nitrogen in the sample and demonstrated fine uniformity and no aggregation presented on the catalyst surface. The photocatalytic degradation of dye from the synthetic wastewater has been carried out resulting the highest photocatalytic activity for N-TiO2 in comparison to undoped samples. The experiment resulted 90 percent of degradation after 140 min while undoped TiO2 represented just 52 percent of degradation. Also, to have a better comparison, the industrial photocatalyst P25 has been used in the same experiment time and operational conditions. The results depicted higher photocatalytic activity for hydrothermal-microwave synthesis of TiO2 compared to industrial TiO2 with 15 percent higher degradation.