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Comptes Rendus Chimie
Volume 18, n° 4
pages 385-390 (avril 2015)
Doi : 10.1016/j.crci.2014.07.003
Received : 22 January 2014 ;  accepted : 8 July 2014
Increasing the efficiency of silicon and aluminum extraction from Volclay by a water iteration treatment for the synthesis of MCM-41 nanomaterials
 

Mehdi Adjdir a, b, , Choukry K. Bendeddouche b, Hadj Benhaoua b, Mhamed Kaid c, Mohamed Karmaoui d, Mohamed Boudinar e, Peter G. Weidler a
a Institute of Functional Interfaces Section, Institute of Technology Karlsruhe (KIT), 76344 Eggenstein-Leopoldshafen Karlruhe, Germany 
b Laboratoire de synthèse organique appliquée, département de chimie, faculté des sciences, université d’Oran, BP 1524, El Menaouar Oran 31000, Algeria 
c Chemistry Department, faculty of science, university of Saida, BP 138, Algeria 
d Department of Physics and CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal 
e Laboratoire “Environnement, catalyse, matériaux, environnement et chimie”, Université des sciences et de la technologie d’Oran Mohamed-Boudiaf, Oran, Algeria 

Corresponding author. Institute of Functional Interfaces Section, Institute of Technology Karlsruhe (KIT), 76344 Eggenstein-Leopoldshafen Karlruhe, Germany.
Abstract

This work aims to reduce the prices of a wide range of nanomaterials which are unreachable in the industry by using natural sources as silicon and aluminum precursors. In a previous work, silicon and aluminum have been extracted from Volclay after applying the alkaline fusion process at 550°C, and a water treatment of this fused clay by adopting a weight ratio (1:4, fusion mass:H2 O) to synthesize Al-MCM-41 nanomaterials. In this study, the weight ratio of fusion mass:H2 O was increased to 1:8 to synthesize a highly structurally ordered MCM-41 under the same reaction conditions. The Al-MCM-41 nanomaterials are investigated by inductively coupled plasma optical emission spectrometry (ICP–OES), powder X-ray diffraction (XRD), N2 adsorption–desorption measurements and scanning electron microscopy (ESEM). As a result, the increase in the weight ratio fusion mass:H2 O generates more silica and aluminum, which allows the formation of well-ordered MCM-41 nanomaterials with high pore volume (0.70cm3/g), high surface area (1044m2/g), and uniform mesoporous diameter (3.67nm); as a consequence, the increase in the weight ratio fusion mass:H2 O leads to an increase in the mass of Al-MCM-41 (9.3g for 1:8 compared to 5g for 1:4), whereas the yield of production of mesoporous materials increases to 86%.

The full text of this article is available in PDF format.

Keywords : MCM-41, Volclay, Alkaline fusion, Nanomaterials


1  Mobil Composition of Matter.


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