Sonocatalytic Oxidation of Reactive Blue 29 by N-Doped Tio 2 From Aqueous Solution



Kamani H¹ ; Nasseri S^{2, 3} ; Nabizadeh R^{2, 3} ; Khoobi M^{2, 3} ; Ashrafi SD⁴ ; Bazrafshan E⁵ ; Mahvi AH^{2, 3} Show Affiliations
Source: Journal of Mazandaran University of Medical Sciences Published:2018

Abstract

Background and purpose: Sonocatalytic process as an advanced oxidation process is considered for degradation of pollutants in aqueous solution. The aim of this study was to increase the removal of dye by doping of TiO 2 with non-metal element such as nitrogen. Materials and methods: Un-doped and N-doped TiO 2 nano-particles with different nitrogen contents were synthesized by a simple sol-gel method in laboratory. X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Energy dispersive X-ray analysis (EDX), and UV- visible diffuse reflectance spectra (UV-vis DRS) were used for characterization of the synthesized nanoparticles. The sonocatalytic activity of synthesized nanoparticles was evaluated by investigating degradation of reactive blue 29 under ultrasonic radiation and the effects of nitrogen doping content, different initial pH of solution, and dye concentration. Results: The study showed that both un-doped and doped nano-particles were in nano-sized that tend to agglomerate. By using different nano-particles, the highest sonocatalytic activity was achieved by 0.6 N-doped TiO 2 with 58 % after 90 min of ultrasonic irradiation. Effect of initial pH of aqueous solution showed that the sonocatalytic activity decreased by increase in initial pH. Conclusion: Sonocatalysis using N-doped TiO 2 was found to be an effective method for degradation of textile dyes. The high sonocatalytic activity could be attributed to the band gap narrowing and anatase phase in TiO 2 nanoparticles. Sonocatalytic degradation followed the Langmuir-Hinshelwood kinetic model (R 2 = 0.98) with a rate constant of 0.01 mg L -1 min -1 . © 2018, Mazandaran University of Medical Sciences. All rights reserved.