Photochemical degradation of an anionic surfactant by TiO2 nanoparticle doped with C, N in aqueous solution

• Published in: Russian Journal of Physical Chemistry A Vol. 90; no. 13; pp. 2668 - 2674
• Main Authors: Zamiri, M., Giahi, M.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2016; Springer Nature B.V
• Subjects: Aqueous solutions; Catalysts; Chemistry; Chemistry and Materials Science; Crystallites; Kinetics; Nanoparticles; Oxidation; Oxidizing agents; Photocatalysis; Photochemistry and Magnetochemistry; Photodegradation; Physical Chemistry; Pollutants; Potassium persulfate; Solid phases; Surfactants; Titanium dioxide; Ultraviolet radiation; X ray powder diffraction; surfactants; C,N-doped TiO; photocatalytic degradation; sodium naphthalenesulfonate formaldehyde condensate; pseudo-first order
• ISSN: 0036-0244; 1531-863X
• DOI: 10.1134/S0036024416130240

Novel C,N-doped TiO 2 nanoparticles were prepared by a solid phase reaction. The catalyst was characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). The results showed that crystallite size of synthesized C,N-doped TiO 2 particles were in nanoscale. UV light photocatalytic studies were carried out using sodium naphthalenesulfonate formaldehyde condensate (SNF) as a model pollutant. The effects of initial concentration of surfactant, catalyst amount, pH, addition of oxidant on the reaction rate were ascertained and optimum conditions for maximum degradation was determined. The results indicated that for a solution of 20 mg/L of SNF, almost 98.7% of the substance were removed at pH ~ 4.0 and 0.44 g/L photocatalyst load, with addition of 1 mM K 2 S 2 O 8 and irradiation time of 90 min. The kinetics of the process was studied, and the photodegradation rate of SNF was found to obey pseudo-first-order kinetics equation represented by the Langmuir–Hinshelwood model.