Article: Performances of pretreated ceria-zirconia nanomaterials/H2O2 system for the degradation of Orange II dye Journal: International Journal of Environment and Waste Management (IJEWM) 2016 Vol.17 No.1 pp.1 - 13 Abstract: In this work, the parameters affecting the reactivity of non-sulfated and sulfated commercial ceria-zirconia (CexZr1−xO2) nanomaterials with varying Ce content (x = 1, 0.80, 0.50, 0.21, 0) towards the degradation of Orange II dye have been evaluated. Characterisation of the catalysts was performed using nitrogen adsorption, XRD, Raman, TGA thermogravimetry and DR-UV-Vis spectroscopy. Briefly, it can be deduced that the sulfation treatment mostly affects the Ce rich catalysts by increasing the crystallite size and lowering the specific surface area. It is shown that the H2O2 dissociates on Ce (III) surface sites to yield peroxide-like species. Such species played a key role in enhancing the discoloration of the dye under dark and UV-Vis conditions. By contrast, the sulfation treatment is unfavorable for the adsorption of H2O2. Sulfates interfere in the formation and the chemical stability of the surface peroxide species via pre-chelating the cerium surface centers, resulting in reducing the catalytic activity of catalysts, especially for CeO2. Inderscience Publishers - linking academia, business and industry through research

Title: Performances of pretreated ceria-zirconia nanomaterials/H₂O₂ system for the degradation of Orange II dye

Authors: Houeida Issa Hamoud; Bruno Azambre; Gisèle Finqueneisel

Addresses: Laboratoire de Chimie et Physique Approche Multi-échelle des Milieux Complexes (LCPA2MC), Université de Lorraine, EA n° 4632, Institut Jean Barriol – Rue Victor Demange, 57500 Saint-Avold, France ' Laboratoire de Chimie et Physique Approche Multi-échelle des Milieux Complexes (LCPA2MC), Université de Lorraine, EA n° 4632, Institut Jean Barriol – Rue Victor Demange, 57500 Saint-Avold, France ' Laboratoire de Chimie et Physique Approche Multi-échelle des Milieux Complexes (LCPA2MC), Université de Lorraine, EA n° 4632, Institut Jean Barriol – Rue Victor Demange, 57500 Saint-Avold, France

Abstract: In this work, the parameters affecting the reactivity of non-sulfated and sulfated commercial ceria-zirconia (Ce_xZr_1−xO₂) nanomaterials with varying Ce content (x = 1, 0.80, 0.50, 0.21, 0) towards the degradation of Orange II dye have been evaluated. Characterisation of the catalysts was performed using nitrogen adsorption, XRD, Raman, TGA thermogravimetry and DR-UV-Vis spectroscopy. Briefly, it can be deduced that the sulfation treatment mostly affects the Ce rich catalysts by increasing the crystallite size and lowering the specific surface area. It is shown that the H₂O₂ dissociates on Ce (III) surface sites to yield peroxide-like species. Such species played a key role in enhancing the discoloration of the dye under dark and UV-Vis conditions. By contrast, the sulfation treatment is unfavorable for the adsorption of H₂O₂. Sulfates interfere in the formation and the chemical stability of the surface peroxide species via pre-chelating the cerium surface centers, resulting in reducing the catalytic activity of catalysts, especially for CeO₂.

Keywords: peroxide species; direct sulfation; AOP; advanced oxidation process; Fenton; nanocomposites; diffuse reflectance spectroscopy; ceria; oxide-based catalysts; cerium oxide; zirconia doping; nanotechnology; H2O2; hydrogen peroxide; dye degradation; Orange II dyes; discoloration; sulphuric acid; adsorption.

DOI: 10.1504/IJEWM.2016.076408

International Journal of Environment and Waste Management, 2016 Vol.17 No.1, pp.1 - 13

Received: 30 Sep 2014
Accepted: 14 Apr 2015
Published online: 06 May 2016 *

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Title: Performances of pretreated ceria-zirconia nanomaterials/H₂O₂ system for the degradation of Orange II dye