Influence of thermal and acidic treatments on the morphology of a natural kaolinitic clay mineral

[en] In this work, a natural kaolinitic clay mineral from Kribi in Cameroon is modified by thermal and acidic treatments. The influence of these treatments on the physicochemical properties of the clays is studied using X-ray diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption measurements, scanning electron microscopy, inductively coupled plasma-atomic emission spectroscopy and thermal analysis. Three calcination temperatures are explored: 600, 700 and 800 °C. The XRD pattern of the untreated clay showed that the natural clay mineral was mostly composed of kaolinite. Calcination at high temperatures allowed the amorphization of the natural kaolinitic clay mineral to obtain metakaolinite. This heat treatment of the natural clay mineral produced disintegration by rupture of the strong hydrogen bonds between the layers of the clay mineral. Heat treatment did not increase the specific surface area of the clay, which stayed around 20-30 m 2 /g. The acid treatment produced a high material texture modification giving microporous materials with a large surface area up to 315 m 2 /g with the sample previously calcined at 800 °C. The microporosity and mesoporosity increase is greater when the clay is calcined at high temperature. The morphology of the samples observed by SEM are modified by the acidic treatment. The initial two-dimensional stacking of particles evolves towards a narrower threedimensional porous structure. These treatments open the way to produce highly porous clay materials that could be used as adsorbent materials for pollutant removal from water.

Disciplines :

Materials science & engineering
Chemical engineering

Author, co-author :

Ngue Song, Pierre ; Université de Liège - ULiège > Chemical engineering

Mahy, Julien ; Université de Liège - ULiège > Chemical engineering ; Centre Eau Terre Environnement, Institut National de la Recherche Scientifique (INRS), Université du Québec, Québec, Canada

Calberg, Cédric ; Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces

Farcy, Antoine ; Université de Liège - ULiège > Chemical engineering

Caucheteux, Joachim ; Université de Liège - ULiège > Chemical engineering

Fagel, Nathalie ; Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires

Lambert, Stéphanie ; Université de Liège - ULiège > Department of Chemical Engineering

Language :

English

Title :

Influence of thermal and acidic treatments on the morphology of a natural kaolinitic clay mineral

Publication date :

12 July 2023

Journal title :

Results in Surfaces and Interfaces

eISSN :

2666-8459

Publisher :

Elsevier BV

Volume :

Pages :

100131

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://api.elsevier.com/content/article/PII:S2666845923000363?httpAccept=text/xml

Available on ORBi :

since 23 July 2023

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