Purification and characterization of smectite clay taken from Gafsa, Tunisia: Progressive elimination of carbonates

Mhamdi, Mohsen; Gasmi, N; Elaloui, Elimame; Kbir‐Ariguib, N.; Trabelsi‐Ayadi, Malika

doi:10.1088/1757-899x/13/1/012030

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…The bentonite used in our study was extracted from the Jebel Stah (Gafsa) deposit in the western region of Tunisia (Mhamdi et al, 2010). The raw clay was purified by immersion in dilute hydrochloride acid (15 g of solid in 50 mL of 10% wt.…”

Section: Starting Bentonite and Dye Materialsmentioning

confidence: 99%

Adsorption-desorption processes of azo dye on natural bentonite: batch experiments and modelling

et al. 2014

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The purpose of this study was to determine whether a bentonite from the Gafsa deposit (western Tunisia) could be used to remove the Foron Blue 291 (FB) azo dye from wastewater. Batch adsorption and desorption experiments were conducted using untreated and purified bentonite and the influence of contact time, pH, adsorbent mass and temperature of the dye solution on the adsorption of FB was evaluated. Kinetic and isotherm data were fitted using two non-linear kinetic and two non-linear isotherm equations. In addition, the fits were evaluated using the coefficient of determination (R2) and the RMSE. The percentage of dye removal increased with increasing amount of adsorbent until total discolouration was achieved. The adsorption isotherms followed the Langmuir model, with the purified bentonite having a higher adsorption capacity than the raw material due to its higher specific surface area. In addition, the FB molecules were removed from the liquid medium by physical adsorption. Batch desorption experiments were conducted to study the desorption kinetics and the characteristics of the desorption isotherms as well as to quantify the portion of the FB (by mass) that was irreversibly fixed on the solid. Overall, the desorption kinetics were similar to the adsorption kinetics, which indicated that the adsorption-desorption process of azo dye is non-singular; irreversibility occurred that was underlined by an observed thermodynamic index of irreversibility (TII) of 0.69–0.94. The desorption isotherms of the FB depended on the mass of the FB that was initially adsorbed on the bentonite sample, suggesting hysteresis. The amount of irreversibly retained FB was between 46 and 68% of the initial adsorbed mass.

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Section: Starting Bentonite and Dye Materialsmentioning

confidence: 99%

Adsorption-desorption processes of azo dye on natural bentonite: batch experiments and modelling

et al. 2014

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“…This led us to search cheap and most feasible treating method. Our choice focused on the process of adsorption by Tunisian bentonite of Oued Tfal (Mhamdi et al, 2010). The clays used were purified-activated.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of organic matter from industrial phosphoric acid (H 3 PO 4 ) onto activated bentonite

Khoualdia

Loungou

Elaloui

2017

Arabian Journal of Chemistry

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The Tunisian industrial phosphoric acid (IPA) was obtained from the phosphate rock by the wet process. However, the organic matter (OM) contained in the acid may interact with organic solvents to form stable foams, preventing phase settling, or simply by forming cross layers and organic phases, and denaturing part of the solvent. Hence, removal of these organics seems to be an important step for the production of decontaminated phosphoric acid.In the phosphoric acid plant of M'dhilla, the OM can be found as colloidal suspension and soluble forms. The colloidal organics are coagulated and deposited with the gypsum precipitation during the aging of H 3 PO 4 , while the soluble part remains behind. The purpose of this work was to study the OM adsorption onto montmorillonite bentonite. Equilibrium data are analyzed by the Langmuir, Freundlich and Redlich-Peterson adsorption isotherm models.ª 2013 Production and hosting by Elsevier B.V. on behalf of King Saud University.

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Towards an Efficient Purification Process of Nanostructured Materials: Investigation of Raw Tunisian Clay for Defluoridation of Natural Water

Mhamdi

Mahjoubi

Azizi

et al. 2023

Water Air Soil Pollut

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Purification and characterization of smectite clay taken from Gafsa, Tunisia: Progressive elimination of carbonates

Cited by 9 publications

References 7 publications

Adsorption-desorption processes of azo dye on natural bentonite: batch experiments and modelling

Adsorption-desorption processes of azo dye on natural bentonite: batch experiments and modelling

Adsorption of organic matter from industrial phosphoric acid (H 3 PO 4 ) onto activated bentonite

Towards an Efficient Purification Process of Nanostructured Materials: Investigation of Raw Tunisian Clay for Defluoridation of Natural Water

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