Synthesis of aluminum-pillared montmorillonites using highly concentrated clay suspensions

Fetter, Geolar; Heredia, Gabriel Guerrero; Velázquez, L.A.; Maubert, A.; Bosch, P.

doi:10.1016/s0926-860x(97)00081-1

Cited by 48 publications

(19 citation statements)

References 7 publications

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“…There are two main methods of pillaring. The earliest method is inorganic pillaring, using polyhydroxocations such as Al, Fe, Fe-Al, Zr-Fe pillared clays [8][9][10][11][12][13][14][15][16]. This method has been improved to synthesize clay-based Fe nanocomposite, which is used in the photo-catalytic activity and adsorption [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Characterization of sodium dodecyl sulfate modified iron pillared montmorillonite and its application for the removal of aqueous Cu(II) and Co(II)

2010

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Characterization of sodium dodecyl sulfate modified iron pillared montmorillonite and its application for the removal of aqueous Cu(II) and Co(II)

2010

Journal of Hazardous Materials

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“…Variants of the traditional method have been researched in order to decrease the water volume and timing of the synthesis. Thus, it has become possible to decrease the volume of water by the use of concentrated suspensions, both clay (10,15,20,40, 50 and 100 wt%) and a pillaring agent (chlorhydrol concentrate) [4][5][6][7][8][9]. Also, the time of intercalation of calcium montmorillonite with chlorhydrol (commercial format of basic aluminum chloride solution) has been reduced through the use ultrasound for a period of a few minutes, having obtained Al-PILC with a high thermal stability and textural properties superior to those of clay modified with an exchange time of 24 h. In general, during the intercalation, treatment with ultrasound [10][11][12] and microwaves [4,[13][14][15] has proved an adequate method for reducing the contact time between the clay and the pillaring agent.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasound on the Structural and Textural Properties of Al–Fe Pillared Clays in a Concentrated Medium

2009

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A modification of bentonite with the Al-Fe mixed system in a concentrated medium was performed, assisting the intercalation with ultrasound. The solid pillaring agent and clay powder were placed in a dialysis membrane in contact with a minimum amount of water, and ultrasound was used to promote species exchange. Al-Fe pillared clays (2, 5 and 10 mol% Fe) were characterized by XRF, CEC, XRD, H 2 -TPR and N 2 adsorption at 77 K, revealing changes in the structural and textural properties of the modified clays in the presence of ultrasound during the intercalation. The catalytic properties of pillared clays were evaluated by using the catalytic wet peroxide oxidation of phenol in a diluted aqueous medium, showing an activity comparable to that of a solid modified through the conventional method.

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“…In a later study, Fetter et al [58] followed the same preparation method to obtain alluminum pillaring of montmorillonites, but starting from highly concentrated aluminium solution and highly concentrated clay suspensions (up to 50 wt%). The glass reaction tube was hermetically closed and placed in a commercial microwave oven (Sharp Carousel, model R-5456-M) operating at 2.45 GHz with a power level settled at 90 W, for 7 minutes.…”

Section: Mw Assisted Preparation Of Pillared Claysmentioning

confidence: 99%

Microwaves-Mediated Preparation of Organoclays as Organic-/Bio-Inorganic Hybrid Materials

Villa¹,

Rosa²,

Corradi³

et al. 2011

COC

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An innovative approach in the field of nanomaterials is to develop modern and mild synthetic protocols that enable controlled and integrated organization of specific functional organic and biological building blocks. In this context, research on the preparation of clay-based organic-inorganic hybrid materials, i.e. organoclays, has received considerable attention because these lamellar materials not only possess highly ordered structure in 2D, but also provide interesting chemical intercalation and surface properties. As a result entrapment and orientation of various functional guest molecules into layered inorganic solids, has been well exploited.At present there is a great deal of interest in the rational design of hybrid organic-/bio-inorganic composites on the nanometer to micrometer length scales. These hybrids encompass highly selective recognition properties associated with organic and biological species, combined with catalytic, optical, and electronic properties of the inorganic lamellar framework. This paper presents an overview of microwave application in different preparation steps of organophilic clays, their modification and their addition to polymeric matrices. Particular attention has been given to the microwave-mediated hydrothermal technique, as innovative and eco-friendly protocol for the intercalation of different kinds of organic hosts into the interlayer of clay minerals. The few pioneering complete microwave-mediated preparation procedures, exploiting advantages of dielectric heating in both the synthesis of the organic host molecule and the intercalation in the clay structure, have been also highlighted.

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Synthesis of aluminum-pillared montmorillonites using highly concentrated clay suspensions

Cited by 48 publications

References 7 publications

Characterization of sodium dodecyl sulfate modified iron pillared montmorillonite and its application for the removal of aqueous Cu(II) and Co(II)

Characterization of sodium dodecyl sulfate modified iron pillared montmorillonite and its application for the removal of aqueous Cu(II) and Co(II)

Effect of Ultrasound on the Structural and Textural Properties of Al–Fe Pillared Clays in a Concentrated Medium

Microwaves-Mediated Preparation of Organoclays as Organic-/Bio-Inorganic Hybrid Materials

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