Kinetics of cadmium adsorption by smectite of Oued Tfal (Gafsa Basin)

Mhamdi, Mohsen; Elaloui, Elimame; Trabelsi‐Ayadi, Malika

doi:10.1080/19443994.2013.810371

Cited by 12 publications

(4 citation statements)

References 41 publications

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“…It means that the proposed model adjusts the experimental data and, therefore, the kinetics of zinc ion adsorption on SIG untreated clay follows the pseudo-second-order model. This behavior agrees very well with other studies presented in the open literature regarding to experimental results of heavy metals removal [17,37,38].…”

Section: Pseudo-second-order Reaction Kineticsupporting

confidence: 92%

Adsorption of Zn2+ on Algerian untreated bentonite clay

Mohellebi

Lakel

2016

Desalination and Water Treatment

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A B S T R A C TThis work has the purpose of evaluating the removal of zinc from aqueous solutions using Algerian untreated bentonite clay as an adsorbent. The choice of using natural untreated clay is justified by the fact that it is both a low cost and friendly environmental adsorbent material. This local bentonite is a montmorillonite clay type with a relatively high cationic exchange capacity of 136.2 meq/100 g. Calcium is the main exchangeable cation. A granulometric analysis shows that 49.1% of the clay particles are submicronic. The zinc adsorption capacity of bentonite was studied in batch mode. A kinetic study shows a fast removal capacity and a highly influenced bentonite adsorption capacity by the operational parameters such as contact time, mass of adsorbent, metal concentration, pH, and temperature. Fifty percent of the Zinc was removed during the first 5 min and equilibrium is reached in 1 h. A maximal removal capacity is obtained for a bentonite concentration of 5 g L −1 and a zinc initial concentration of 100 mg L −1 . A pseudo-second-order kinetic model could be fitted to the experimental data. The equilibrium data could be fitted with a Langmuir isotherm equation. Depending on the negative value of ΔG, the adsorption of Zn 2+ on SIG untreated bentonite surfaces was spontaneous and the adsorption was an endothermic process.

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Section: Pseudo-second-order Reaction Kineticsupporting

confidence: 92%

Adsorption of Zn2+ on Algerian untreated bentonite clay

Mohellebi

Lakel

2016

Desalination and Water Treatment

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“…One of the future research trends of innovative components derived from nanotechnology for ecological facets is highlighted by the synthesis of organic–inorganic hybrids having a phyllosilicate-like structures. The synthesis pathway brings new advantages such as a high purity level and a possibility to chemically modify it at any stage of the synthesis [33,34]. The literature lists one major synthesis pathway related to heavy metal adsorption: the sol-gel method.…”

Section: Use Of Lamellar Materials For the Purification Of Aqueousmentioning

confidence: 99%

Inorganic and Hybrid (Organic–Inorganic) Lamellar Materials for Heavy Metals and Radionuclides Capture in Energy Wastes Management—A Review

et al. 2019

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The energy industry (nuclear, battery, mining industries, etc.) produces a large quantity of hazardous effluents that may contain radionuclides (137Cs and 90Sr in particular) and heavy metals. One of the hardest tasks of environmental safety and sustainable development is the purification of wastewater holding these pollutants. Adsorption is one of the most powerful methods for extracting toxic compounds from wastewater. This study reviews the usefulness of clay minerals as adsorbent for removing these hazardous elements to clean up energy production processes. Phyllosilicates are able to extract several heavy metals from effluent, as widely examined. A particular focus is given to synthetic phyllosilicates and their abilities to entrap heavy metals with a special attention paid to those synthesized by sol-gel route. Indeed, this method is attractive since it allows the development of organic–inorganic hybrids from organosilanes presenting various functions (amino, thiol, etc.) that can interact with pollutants. Regarding these pollutants, a part of this review focuses on the interaction of lamellar materials (natural and synthetic phyllosilicates as well as layered double hydroxide) with heavy metals and another part deals with the adsorption of specific radionuclides, cesium and strontium.

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“…Kinetic experiments were conducted with constant NiFe 2 O 4 /HAP/GQDs dose (0.1 g) at certain time intervals (1.0, 3.0, 5.0, 7.0, 10, 15, 20, 30, 40 and 60 min) at pH = 6. The uptake isotherm experiments were done by mixing 0.03 g of NiFe 2 O 4 /HAP/GQDs in a jar containing 100 mL of Cd 2+ solutions with varying concentrations (5,10,20,40,50 and 100 mg L −1 ) at pH = 6 for 10 min to reach equilibrium. Kinetic experiments demonstrated that contact time of 10 min was enough to attain equilibrium.…”

Section: Cadmium Adsorption By Nife 2 O 4 /Hap/gqdsmentioning

confidence: 99%

“…Cadmium has been shown to cause kidney failure [2]. Due to its hazardous impacts on human healthiness, removing cadmium from water and wastewater is a major environmental problem [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Adsorptive removal of cadmium from aqueous solutions using NiFe2O4/hydroxyapatite/graphene quantum dots as a novel nano-adsorbent

2018

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In this study, NiFe 2 O 4 /hydroxyapatite/graphene quantum dots (NiFe 2 O 4 /HAP/GQDs) as nano-adsorbent to remove cadmium (Cd 2+) from aqueous solution were synthesized. This nano-adsorbent was depicted by some techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). Adsorption studies were conducted to investigate the effect of contact time, pH, adsorbent dosage and initial cadmium ion concentration on removal efficiency. To determine the most fitting kinetic model, the suitability of pseudo-first-order and pseudo-second-order models was compared. The adsorption isotherm was described well by the Langmuir isotherm and maximum equilibrium uptake capacity (q e) was 344.83 mg g −1. Studies revealed that adsorption process is not a physical process and formation of complexes (bidentate and monodentate complexes) between-COO − and-OH functional groups on the surface of NiFe 2 O 4 /HAP/GQDs and Cd 2+ ions may occur. In addition, the adsorbent can simply be removed by an ordinary filtration process.

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Kinetics of cadmium adsorption by smectite of Oued Tfal (Gafsa Basin)

Cited by 12 publications

References 41 publications

Adsorption of Zn2+ on Algerian untreated bentonite clay

Adsorption of Zn2+ on Algerian untreated bentonite clay

Inorganic and Hybrid (Organic–Inorganic) Lamellar Materials for Heavy Metals and Radionuclides Capture in Energy Wastes Management—A Review

Adsorptive removal of cadmium from aqueous solutions using NiFe2O4/hydroxyapatite/graphene quantum dots as a novel nano-adsorbent

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