Adsorption of cadmium onto Al13-pillared acid-activated montmorillonite

Yan, Liangguo; Shan, Xiao-quan; Wen, Bin; Owens, Gary

doi:10.1016/j.jhazmat.2007.12.045

Cited by 59 publications

(27 citation statements)

References 47 publications

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“…The adsorption free energy (E) of D-R model and the binding energy (b) from Temkin model emphasized that Cd(II) adsorption onto modified bentonite is chemical or ion exchange adsorption with strong interaction between cadmium ions and functional groups of modified bentonite. These results in comparison with other reports of Cd(II) adsorption are considerable [24,33,34]. Generally, the Cd(II) has been adsorbed onto Fe-bentonite by monolayer mechanism.…”

Section: Evaluation Of Adsorption Isotherm Modelssupporting

confidence: 74%

Comparative study effects of calcinations, electrolytes, and Fe-bentonite, CaCO₃-bentonite on the removal of Cd(II) ions from aqueous solution

Sadeghalvad

Azadmehr

2015

Desalination and Water Treatment

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A B S T R A C TThis study presents the influence of different variables on Cd(II) adsorption in Iranian bentonite namely two different types of electrolytes (carbonate and chloride salts), calcination temperature, loading of Fe(III)-Fe(II) (synthesized Fe-bentonite) and CaCO 3 on bentonite. According to the experimental data, Na 2 CO 3 is the best modifier electrolyte in comparison with other carbonate salts and chloride salts. The maximum removal (100%) of 1,000 ppm Cd(II) from aqueous solution was achieved in presence of 0.1 M of Na 2 CO 3 and 5 g bentonite. Furthermore, Iranian bentonite was modified by CaCO 3 and Fe(III)/Fe(II) salts to have synthesized CaCO 3 -bentonite and Fe-bentonite. For the equilibrium study of Cd(II) adsorption onto these compounds, the Langmuir, Freundlich, Temkin, and DubininRadushkevich (D-R) models have been examined. The Langmuir and Freundlich models explained the highest correlation coefficients for Fe-bentonite and CaCO 3 -bentonite, respectively. According to the Langmuir (for Fe-bentonite) and Freundlich (for CaCO 3 -bentonite) models, the maximum adsorption capacity were 32.39 mg/g and 1.97 mg 1−1/n L 1/n g −1 , respectively. The calculated results of DR models showed that Cd(II) adsorption onto modified bentonite is chemical adsorption or ion exchange interaction. The obtained thermodynamic parameters of Cd(II) adsorption indicated that Cd(II) adsorption onto modified one was spontaneous and Cd(II) adsorptions onto Fe-bentonite and CaCO 3 -bentonite were exothermic and endothermic, respectively.

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Section: Evaluation Of Adsorption Isotherm Modelssupporting

confidence: 74%

Comparative study effects of calcinations, electrolytes, and Fe-bentonite, CaCO₃-bentonite on the removal of Cd(II) ions from aqueous solution

Sadeghalvad

Azadmehr

2015

Desalination and Water Treatment

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“…Nowadays, a variety of pillared montmorillonites have been used to remove heavy metals from wastewater [13][14][15][16][17][18][19]. Cd(II) sorption was increased by the presence of poly-hydroxyl ferric on montmorillonite [13].…”

Section: Introductionmentioning

confidence: 99%

Enhanced sorption of radiocobalt from water by Bi(III) modified montmorillonite: A novel adsorbent

Zhang

Niu

et al. 2011

Journal of Hazardous Materials

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“…Yan et al [24] suggested that the effect of pH may be interpreted on the basis of availability of binding sites present at the clay surface and that the adsorption of free cadmium ion (Cd 2+ ) can be described by utilization of both ion-exchange sites and specific adsorption sites. At low pH, Cd 2+ is predominantly adsorbed on the permanent charge sites of Na+ montmorillonite while substantial portion of Cd 2+ was probably adsorbed on the edge surfaces at higher pH [25].…”

Section: Resultsmentioning

confidence: 99%

Selective Adsorption of Cadmium Species onto Organic Clay Using Experimental and Geochemical Speciation Modeling Data

Ahmed¹

2016

IJET

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Abstract-The effect of cadmium speciation on cadmium adsorption onto Hexadethyl-trimethyl ammonium (HDTMA) modified montmorillonite was investigated experimentally and using Minteqa2 geochemical speciation model. The results revealed that the increase in cadmium uptake at higher pH values is selective and directly related to the nature of species present and that this increase does not affect the form of cadmium species adsorbed onto the HDTMA modified montmorillonite.

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Adsorption of cadmium onto Al13-pillared acid-activated montmorillonite

Cited by 59 publications

References 47 publications

Comparative study effects of calcinations, electrolytes, and Fe-bentonite, CaCO₃-bentonite on the removal of Cd(II) ions from aqueous solution

Comparative study effects of calcinations, electrolytes, and Fe-bentonite, CaCO₃-bentonite on the removal of Cd(II) ions from aqueous solution

Enhanced sorption of radiocobalt from water by Bi(III) modified montmorillonite: A novel adsorbent

Selective Adsorption of Cadmium Species onto Organic Clay Using Experimental and Geochemical Speciation Modeling Data

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Adsorption of cadmium onto Al13-pillared acid-activated montmorillonite

Cited by 59 publications

References 47 publications

Comparative study effects of calcinations, electrolytes, and Fe-bentonite, CaCO3-bentonite on the removal of Cd(II) ions from aqueous solution

Comparative study effects of calcinations, electrolytes, and Fe-bentonite, CaCO3-bentonite on the removal of Cd(II) ions from aqueous solution

Enhanced sorption of radiocobalt from water by Bi(III) modified montmorillonite: A novel adsorbent

Selective Adsorption of Cadmium Species onto Organic Clay Using Experimental and Geochemical Speciation Modeling Data

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Comparative study effects of calcinations, electrolytes, and Fe-bentonite, CaCO₃-bentonite on the removal of Cd(II) ions from aqueous solution

Comparative study effects of calcinations, electrolytes, and Fe-bentonite, CaCO₃-bentonite on the removal of Cd(II) ions from aqueous solution