Article (Scientific journals)
Hybrid clay-based materials for organic dyes and pesticides elimination in water
Tsaffo Mbognou, Marlène Huguette; Lambert, Stéphanie; Caucheteux, Joachim et al.
2023In Journal of Sol-Gel Science and Technology, 105, p. 461-470
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Keywords :
Adsorption; Photocatalyse; Smectite; ZnO; Green Chemistry; Sol-Gel
Abstract :
[en] Natural clay, extracted from Cameroon, was modified by ion exchange to produce 4 different clays. These latter were modified with photocatalytic semiconductor like ZnO to produce efficient hybrid materials for pollutant removal in water. ZnO was synthesized by the soft sol-gel chemistry method. The results showed that the clay belonged to the smectite family and was composed of different crystalline phases. When the hybrid materials were produced, mix crystalline patterns were obtained with both smectite and ZnO wurtzite phases. The ICP-AES analysis showed that similar ratio between ZnO and clay were obtained for the 4 hybrid materials (30 wt% of ZnO and 70 wt% of clay). The SEM observation of the samples had shown that the hybrid materials had the clay structure as skeletal structure (sheet like structure) with the ZnO spherical materials grafted at the surface, giving a good exposure to light to maintain photocatalytic property. Then, the pollutant removal property of the samples was evaluated on three different model pollutants: p-nitrophenol (PNP), Malachite green (MG) and Diamant brilliant violet (DBV). On PNP, no adsorption was observed, and photocatalytic property was necessary to eliminate this molecule. With the best hybrid material (Clay/Cu 2+ /ZnO), 80% of PNP degradation was observed after 6 h of illumination. On MG and DBV, similar behavior was observed. Indeed, the clays and three out of four hybrid materials adsorbed completely both pollutant after 2 h of contact. Only pure ZnO and Clay/ZnO needed illumination to degrade completely both molecules. This study showed the possibility to obtain very efficient hybrid materials for pollutant removal in water with the use of inexpensive natural clay modified with a low amount of photocatalytic material (ZnO around 30 wt.%).
Disciplines :
Materials science & engineering
Chemical engineering
Author, co-author :
Tsaffo Mbognou, Marlène Huguette;  Department of Chemical Engineering -Nanomaterials, Catalysis & Electrochemistry, University of Liège, Liège, Belgium ; Laboratoire de Physico-chimie des matériaux minéraux, University of Yaounde I, Yaounde, Cameroon ; Institute of Geological and Mining Research (IRGM), Yaounde, Cameroon
Lambert, Stéphanie  ;  Université de Liège - ULiège > Department of Chemical Engineering
Caucheteux, Joachim ;  Université de Liège - ULiège > Unités de recherche interfacultaires > Centre interfacultaire des biomatériaux (CEIB)
Farcy, Antoine ;  Université de Liège - ULiège > Chemical engineering
Alié, Christelle ;  Université de Liège - ULiège > Chemical engineering
Fagel, Nathalie  ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Djoufac Woumfo, Emmanuel;  Laboratoire de Physico-chimie des matériaux minéraux, University of Yaounde I, Yaounde, Cameroon
Mahy, Julien  ;  Université de Liège - ULiège > Chemical engineering ; Centre-Eau Terre Environnement, Institut National de la Recherche Scientifique (INRS), Université du Québec, Québec, Canada
Language :
English
Title :
Hybrid clay-based materials for organic dyes and pesticides elimination in water
Publication date :
13 February 2023
Journal title :
Journal of Sol-Gel Science and Technology
ISSN :
0928-0707
eISSN :
1573-4846
Publisher :
Springer, New York, United States - New York
Volume :
105
Pages :
461-470
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 05 December 2022

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