Evaluating the adsorptive capacity of montmorillonitic and calcareous clays on the removal of several heavy metals in aqueous systems

► Tunisian natural adsorbents have high adsorptive capacities for heavy metals. ► Impurities influenced the removal capacity especially carbonates minerals. ► The removal kinetics was governed by the pseudo-second-order model. ► The experimental data fitted to Langmuir model better than Freundlich a...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2011-08, Vol.172 (1), p.37-46
Main Authors: Sdiri, Ali, Higashi, Teruo, Hatta, Tamao, Jamoussi, Fakher, Tase, Norio
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Adsorption isotherm
aluminum oxide
Applied sciences
aqueous solutions
calcium
carbonates
Chemical engineering
clay
Clays
Exact sciences and technology
fluorescence
General purification processes
Heavy metals
Infrared
iron
Isotherms
magnesium
Pollution
Scanning electron microscopy
silica
sorption isotherms
Spectroscopic analyses
spectroscopy
surface area
thermal analysis
toxicity
Waste water
Wastewater
Wastewaters
Water treatment and pollution
X-radiation
X-ray diffraction
X-rays
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Summary:► Tunisian natural adsorbents have high adsorptive capacities for heavy metals. ► Impurities influenced the removal capacity especially carbonates minerals. ► The removal kinetics was governed by the pseudo-second-order model. ► The experimental data fitted to Langmuir model better than Freundlich and D–R models. ► The studied material achieved better removal efficiency than other natural adsorbents. The present work aimed to achieve mineralogical and spectroscopic characterization of the Late Cretaceous clays of Aleg formation (Coniacian-Lower Campanian system), Tunisia, for the removal of several toxic metals in aqueous system. The collected clay samples were first characterized by different techniques including X-ray fluorescence (XRF), thermal analysis (TG/TDA), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). Results showed that the natural clay samples are mainly composed of silica, alumina, iron, calcium and magnesium oxides. The sorbents are mainly mesoporous materials with modest specific surface area of
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2011.05.015