Synthesis and characterization of C, N, S and Fe modified TiO2 nanophotocatalyst: efficiency on the degradation

of methyl orange and levafix blue

 

I. Ellouzi1, L. ELayazi2, M. Harir3, P. Schmitt-Kopplin3a, b,

L. Laanab4, H. Mountacer2, S. El Hajjaji1*

1 LS3ME, Equipe physico-chimie des matériaux et environnement, University Mohamed V,

Faculty of Sciences, Av. Ibn Battouta, B.P 1014 Rabat, Morocco

2Laboratory of Sciences of the Environment and Development, Ecological chemistry team,

Faculty of Sciences and Techniques, University Hassan 1st, B.P577, Settat–Morocco

3aResearch Unit Analytical Biogeochemistry, German Research Center for Environmental Health, Helmholtz Zentrum München Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany

3bChair of Analytical Food Chemistry, Technische Universität München, 85354 Freising-Weihenstephan, Germany

4LCS, University Mohamed V, Faculty of Sciences, Av. IbnBatouta, B.P 1014 Rabat, Morocco

* Corresponding author. E-mail: S. El Hajjaji (selhajjaji@hotmail.com)

Received: 23 November 2014; revised version accepted: 31 December 2014

 

Abstract

     TiO2 P25 photocatalyst is used as a reference for the study of organic molecules photodegradation. The objective of this study was to investigate the ability of synthesized doped titanium dioxide nanoparticles to remove textile dyes, Methyl orange and Levafix blue dyes, from aqueous solutions by photocatalysis process. Doped titanium dioxide nanoparticles were successfully prepared by a modified sol–gel method. The results reveal that all the samples consist of crystalline anatase with mesoporous structures. Transmission electron microscope (TEM) confirmed that the photocatalysts were in nanometer size with a diameter of about 9 nm. X-ray diffraction (XRD) showed that the photocatalysts were predominantly in well-crystallized anatase phase; UV–Vis diffuse reflectance spectroscope (UV–Vis DRS) presents a shift absorption from the UV region into the visible-light region. Surface area analyzer was used to characterize the synthesized catalyst.

     Synthesized powders were used for the degradation of methyl orange and levafix blue dyes in aqueous solution under visible light. It was found that doped TiO2 increases methyl orange and levafix blue photodegradation in comparison with TiO2 P25.

 

Keywords: Methyl orange; Levafix blue; Iron; Thiourea; Photocatalytic activity.

 


 

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