Effect of microwave irradiation time on the synthesis of zirconia-pillared clays

Fetter, Geolar; Hernández, Víctor Manuel Feregrino; Rodriguez, Victor Hugo Garcia; Valenzuela, Miguel A.; Lara, V.H.; Bosch, P.

doi:10.1016/s0167-577x(02)00961-8

Cited by 31 publications

(9 citation statements)

References 9 publications

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“…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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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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“…Even though a large number of researchers are using domestic microwave ovens and a restricted number have the availability of fully monitored laboratory scale microwave ovens [for organoclay : 22, 65-67, 69], a number of benefits, apart from a general reduced reaction time, can be listed for the use of microwaves in the preparation of as organic-inorganic hybrid nanomaterials: -short reaction time in microwave assisted preparation of pillared clays allowed complex inorganic compounds to be used [59] since the salts polymerization can be avoided; -possibility to control surface area, micropores and mesopores surface area of smectites during HCl acidification by varying microwave irradiation power [60];…”

Section: Discussionmentioning

confidence: 99%

“…More recently some of the previously mentioned authors [59] presented the synthesis, at different zirconia/clay ratios, of Zrpillared montmorillonite in presence of microwave irradiation.…”

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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“…A number of studies also reported PILCs materials synthesized using microwave irradiation with characteristics that can be matched with those of PILCs materials synthesized by means of the conventional methods. 15,36,41,42 Another problem which hinders the commercialization of PILCs at industrial scale is that the clay dispersion is diluted by the use of high volumes of water during the synthesis process, and addition of pillaring solutions to the clay suspension takes a long time. As reported by numerous studies water consumption can be signicantly reduced by using concentrated clay suspensions and dry clay.…”

Section: Synthesis Of Pillared Interlayered Clays (Pilcs)mentioning

confidence: 99%

Synthesis and application of pillared clay heterogeneous catalysts for wastewater treatment: a review

2018

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Effect of microwave irradiation time on the synthesis of zirconia-pillared clays

Cited by 31 publications

References 9 publications

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

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

Synthesis and application of pillared clay heterogeneous catalysts for wastewater treatment: a review

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