alexa Removal of Crystal Violet and Hexavalent Chromium using
ISSN: 2157-7048

Journal of Chemical Engineering & Process Technology
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Research Article

Removal of Crystal Violet and Hexavalent Chromium using TiO2-Bentonite under Sunlight: Effect of TiO2 Content

Ridha Djellabi1*, Mohamed Fouzi Ghorab1, Claudia Letizia Bianchi2, Giuseppina Cerrato3 and Sara Morandi3
1Laboratory of Water Treatment and Valorization of Industrial Wastes, Chemistry Department, Faculty of Sciences, Badji-Mokhtar University, BP12 2300, Annaba, Algeria
2Università degli Studi di Milano, Dip. Chimica and INSTM-UdR Milano, Milano, Italy
3Università degli Studi di Torino, Dipartimento di Chimica and NIS Interdepartmental Centre and Consorzio INSTM-UdR Torino, Italy
*Corresponding Author : Ridha Djellabi
Università degli Studi di Milano
Dip. Chimica and INSTM-UdR Milano
Milano, Italy
Tel: 213774662262
E-mail: [email protected]
Received: February 09, 2016; Accepted: February 25, 2016; Published: February 29, 2016
Citation: Djellabi R, Ghorab MF, Bianchi CL, Cerrato G, Morandi S (2016) Removal of Crystal Violet and Hexavalent Chromium using TiO2-Bentonite under Sunlight: Effect of TiO2 Content. J Chem Eng Process Technol 7:276. doi:10.4172/2157-7048.1000276
Copyright: © 2016 Djellabi R, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


The main objective of this study was to investigate the correlation between TiO2 content in photoactive bentonite (B-TiO2) and the pathway by which crystal violet (CV) and hexavalent chromium (Cr (VI)) are removed from water under sunlight. B-TiO2 samples were prepared by impregnation with TiCl4 with different weight ratios (g/g) (namely, 5, 10, 20 and 30%). Materials were characterized using different techniques, among which: SEM, FT-IR, XRD, HRTEM, EDX and Zeta potential measurements. Results show that, only the anatase TiO2 polymorph was formed in the bentonite and the porosity of materials decreases with the increase of TiO2 content. Furthermore, zeta potential measurements indicate that, when TiO2 content increases, the negative charge of materials decreases. On the other hand, experimental results show that these materials combine both adsorption and photocatalytic reactions to remove CV molecules from water. As the TiO2 content increases, the adsorption capacity decreases, while the photocatalytic activity is more important. In the case of Cr (VI) species, all samples show a few adsorption because of the repulsion effect between these species and the negative charge of the bentonite. Therefore, under sunlight, the Cr (VI) removal occurred mainly by the photoreduction reaction that is more efficient when the TiO2 content increases.


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