Mercury adsorption by montmorillonite and vermiculite: a combined XRD, TG-MS, and EXAFS study

Brigatti, Maria Franca; Colonna, Stefano; Malferrari, Daniele; Medici, Luca; Poppi, Luciano

doi:10.1016/j.clay.2004.03.006

Cited by 95 publications

(40 citation statements)

References 11 publications

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“…In particular, the pristine Vm shows a very low adsorption capacity of Hg(II), but the adsorption capacity is improved for above 90% after functionalized by BAL with 3 CEC ratios. Based on Lewis theory, Mt is considered as a soft base and thereby can adsorb larger amount of Hg(II) (a soft acid) when compared with Vm, which is classified as a hard base [40]. However, BAL-Mt presents a relatively lower increase of Hg(II) uptake in comparison with BAL-Vm.…”

Section: Comparison Of the Adsorption Capacities Of Vm Or Mt With Difmentioning

confidence: 99%

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

Tran

Zhu

et al. 2015

Applied Surface Science

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Section: Comparison Of the Adsorption Capacities Of Vm Or Mt With Difmentioning

confidence: 99%

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

Tran

Zhu

et al. 2015

Applied Surface Science

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“…In the TG curves for the raw vermiculite (Figure 2b), showed the first mass loss of approximately 14% observed between 35 and 260 °C, the loss was attributed to the release 19,20 In the functionalized sample, the loss was 31% between 35 and 950 °C. The mass loss occurred almost immediately for the functionalized material in which the bonds may be weakened by the structural disorder by the leaching process.…”

mentioning

confidence: 99%

Functionalization of Bentonite and Vermiculite after the Creation of Structural Defects through an Acid Leaching Process

Moraes

Miranda

Angélica

et al. 2017

J. Braz. Chem. Soc.

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The synthesis and use of functionalized materials is growing every year. Thus, this work presents a methodology for the functionalization of bentonite and vermiculite after the acid leaching of the raw materials. Leaching was performed with sulfuric acid (H 2 SO 4 ), and the functionalization was performed with (3-mercaptopropyl)trimethoxysilane (MPTS), which was oxidized after being anchored to the support. Compared to the results in the literature for directly functionalized raw bentonite, the materials had a greater number of anchored propyl sulfonic acid groups, and the greatest number of these groups led to an increase in the acidity of the raw materials. The raw and functionalized bentonite and vermiculite were characterized by X-ray diffraction (XRD), energy dispersive X-ray (EDX), thermogravimetric analysis (TGA), N 2 adsorption and the surface acidity was determined by acid-base titration.

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“…Clays and minerals such as montmorillonite, vermiculite, illite, kaolinite and bentonite are known as alternative materials used to adsorption of heavy metal due to several economic advantages [1][2][3][4][5][6][7][8][9] and their intrinsic properties, such as large specific surface area, excellent physical and chemical stability and properties structural and surface 10 . Other low-cost adsorbents have been investigated, mainly using bioadsorbents, such as algae 11 and chitosan 12 .…”

Section: Introductionmentioning

confidence: 99%

Cu(II) adsorption on modified bentonitic clays: different isotherm behaviors in static and dynamic systems

2011

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Cu (II) removal equilibrium from aqueous solutions using calcined clays "Bofe" and "Verde-lodo" has been studied by batch and fixed-bed in static and dynamic systems, respectively. Analyses were performed for physicochemical characterization of clays using the techniques: X-ray fluorescence (XRF), thermogravimetry (TG), N 2 adsorption (BET) and Cationic Exchange Capacity (CEC). Batch experiments were performed at a constant temperature, adjusting the pH of the solution in contact with clays. Adsorption assays in fixed bed were conducted at the flow rate determined through mass transfer zone (MTZ). Langmuir and Freundlich models were adjusted to equilibrium data. The results of characterization indicated that the temperature of 500 °C is best suited for the calcination of the clays. The maximum adsorption capacity was higher for dynamic system than fixed bed compared to static system, enhancing from 0.0748 to 0.1371 and from 0.0599 to 0.22 mmol.g -1 of clay for "Bofe" and "Verde-lodo", respectively.

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Mercury adsorption by montmorillonite and vermiculite: a combined XRD, TG-MS, and EXAFS study

Cited by 95 publications

References 11 publications

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

Functionalization of Bentonite and Vermiculite after the Creation of Structural Defects through an Acid Leaching Process

Cu(II) adsorption on modified bentonitic clays: different isotherm behaviors in static and dynamic systems

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