Journal ArticleDOI
The trapping of b from water by exfoliated and functionalized vermiculite
Mohamed Kehal,Laurence Reinert,David Maurin,Jean-Louis Bantignies,Fumihiko Ohashi,Ammar Mennour,Laurent Duclaux +6 more
TLDR
In this paper, the effect of the pH on B adsorption and the adorption kinetics were compared to raw vermiculite and fitted well with the Freundlich equation.Abstract:
Micron-grade natural vermiculite was modified by several physical and chemical treatments in order to increase the adsorption capacity of this material for B. A thermal exfoliation ( T = 600°C) of pristine material, a chemical exfoliation through reaction with hydrogen peroxide (H2O2 35%), or grafting of a specific B complexant ( i.e. N-methyl-D-glucamine: NMDG) led to an increase in the uptake of B at low initial concentrations of the aqueous solutions ([B] ≈ 5 mg L−1). The more efficient material is the NMDG-grafted clay, for which the adsorption uptake is four times greater than that of raw vermiculite, and reaches 0.04 mmol g−1. For all modified materials, the effect of the pH on B adsorption and the adsorption kinetics were studied and compared to raw vermiculite. Adsorption isotherms were also plotted and fitted well with the Freundlich equation.read more
Citations
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Journal ArticleDOI
Effect of sonication conditions: Solvent, time, temperature and reactor type on the preparation of micron sized vermiculite particles
Farman Ali,Farman Ali,Farman Ali,Laurence Reinert,Jean-Marc Lévêque,Laurent Duclaux,Fabrice Muller,Shaukat Saeed,Syed Sakhawat Shah +8 more
TL;DR: The results indicated clearly that the efficiency of ultrasound irradiation was significantly affected by different parameters such as temperature, solvent, type of gas and reactor type.
Journal ArticleDOI
Role of electrostatic interactions in the adsorption of cadmium(II) from aqueous solution onto vermiculite
TL;DR: In this paper, the adsorption equilibrium data of Cd(II) on vermiculite was obtained in a batch adsorber and interpreted with the Langmuir, Freundlich and Prausnitz-Radke (PR) isotherm models.
Journal ArticleDOI
Characterization and boron adsorption capacity of vermiculite modified by thermal shock or H2O2 reaction and/or sonication
TL;DR: In this article, a modified vermiculite from Palabora (South Africa) was modified by thermal shock (700°C), chemical exfoliation (80°C in the presence of H 2 O 2 ) and ultrasonic treatments to improve the adsorption of boron.
Journal ArticleDOI
Boron adsorption mechanism on polyvinyl alcohol
TL;DR: In this paper, the authors investigated the boron adsorption characteristics of polyvinyl alcohol (PVA), and then studied the relationship between the number of adsorbing sites and actual adsorptive amounts, using ASA as an indicator of the ratio of effectively functioning hydroxyl groups from the many hydroxil groups in PVA.
Journal ArticleDOI
Organically modified micron-sized vermiculite and silica for efficient removal of Alizarin Red S dye pollutant from aqueous solution
Nisar Ali,Farman Ali,Ikram Ullah,Zarshad Ali,Laurent Duclaux,Laurence Reinert,Jean-Marc Lévêque,Amjad Farooq,Muhammad Bilal,Iftikhar Ahmad +9 more
TL;DR: In this paper, a grafted mesoporous silica (GSIL) was synthesized through demineralization of the micron-sized VMT and further functionalized with 3-aminopropyltriethoxysilane through sonication.
References
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Book
Infrared and Raman Characteristic Group Frequencies: Tables and Charts
TL;DR: This new edition of this highly successful manual is not only a revised text but has been extended to meet the interpretive needs of Raman users as well as those working in the IR region, creating a uniquely practical, comprehensive and detailed source for spectral interpretation.
Book
Introduction to Infrared and Raman Spectroscopy
TL;DR: Theoretical analysis of molecular vibrational and rotational spectra has been studied in this paper, with a focus on the Vibrational Origin of Group Frequencies (VIB).
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786. Studies in adsorption. Part XI. A system of classification of solution adsorption isotherms, and its use in diagnosis of adsorption mechanisms and in measurement of specific surface areas of solids
Book
The Infrared spectra of minerals
TL;DR: The use of vibrational spectroscopy as a tool in identifying mineral species and in deriving information concerning the structure, composition and reactions of minerals and mineral products is discussed in this paper.