Preparation of nitrogen doped commercial TiO2 nanoparticles: investigation of photocatalytic efficiency for treatment of contaminated water with organic dyes

سال انتشار: 1389
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 219

نسخه کامل این مقاله ارائه نشده است و در دسترس نمی باشد

استخراج به نرم افزارهای پژوهشی:

لینک ثابت به این مقاله:

شناسه ملی سند علمی:

MIAUCHEMISTRY01_015

تاریخ نمایه سازی: 18 اسفند 1397

چکیده مقاله:

During dye production and textile manufacturing processes a large amount of wastewater containing dyestuffs with intensive color and toxicity can be introduced into aquatic systems [1]. Advanced Oxidation Processes (AOPs) have been growing during the last decade, since they are able to deal with the problem of dye destruction in aqueous systems [2]. Among AOPs, heterogeneous photocatalysis using TiO2 nanomaterials as photocatalyst appears as the most emerging destructive technology [3]. Anatase form of TiO2 has a high energy of the band gap (Eg > 3.2 eV), and therefore can be excited by UV radiation only (λ < 380 nm). In this work, the commercially available and relatively cheap anatase TiO2 powders (Coteix KA-100) were doped with nitrogen (using urea as a source of nitrogen) by simple method to shift the TiO2 absorption towards the visible region. Nitrogen doped TiO2 was prepared by manual grinding with urea and annealing at 400 oC for one hour [4, 5]. X-ray diffraction (XRD), UV–Vis spectroscopy (DRS), specific surface areas and transmission electron microscopy (TEM) were used to characterize the catalyst properties. Diffuse reflectance spectra (DRS) showed that the doping with urea shifted the TiO2 absorption towards the visible region. The photocatalytic activity of the N-doped and undoped TiO2 samples was compared in decolorization of a dye solution containing C.I. Basic Red 46. In order to study the effect of chemical structure on photocatalysis efficiency, the photocatalytic degradation of four commercial textile dyes (C.I. Basic Red 46 (BR46), C.I. Acid Green 25 (AG25), C.I. Basic Blue 3 (BB3) and Malachite green (MG) with different structure and different substitute groups was investigated using N-doped TiO2 under visible light irradiation. Our results indicated that the photocatalytic decolorization efficiency of the dyes were in the order of MG > BR46 > BB3 > AG25.

نویسندگان

A.R. Khataee

Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran

M. Zarei

Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran

S. Nourie

Department of Chemistry, Faculty of Science, University of Urmia,Urmia, Iran

L. Moradkhannejhad

Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran -Department of Chemistry, Faculty of Science, University of Urmia,Urmia, Iran