Experimental design investigation for vermiculite modification: Intercalation reaction and application for dye removal

Queiroga, Líbia N.F.; Soares, Patrícia Kaori; Fonseca, Maria G.; Oliveira, Fernando J.V.E.

doi:10.1016/j.clay.2016.02.031

Cited by 24 publications

(8 citation statements)

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“…Vermiculites generally show a wide variation in chemical composition, even within the same deposit or occurrence. This variation is due mainly to the differences in its mineralization, alteration of biotite mica, and degree of weathering [60]. Comparing the composition of both samples, only slight differences were observed.…”

Section: Resultsmentioning

confidence: 95%

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Expansibility of vermiculite (Santa Luzia, Brazil) irradiated with microwave

et al. 2021

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The effect of microwave heating on the expansion of vermiculite was studied at a level of 700 W for 4 min exposure time and compared with raw vermiculite. In this study, the characterization of vermiculite from a mine in the northeast region of Brazil was performed using thermogravimetry, N 2 -adsorption, cation exchange capacity, X-ray powder diffraction (XRD), infrared (IR) spectroscopy, X-ray fluorescence spectroscopy (XRF), and scanning electron microscopy (SEM). Following the microwave heating, the vermiculite was characterized using XRD, IR spectroscopy, and SEM. Microwave irradiation of the vermiculite sample caused structural changes such as loss of crystallinity and disorder, as revealed by the XRD patterns, but did not cause expansion. Results from SEM and IR spectroscopy showed that the microwave heating did not cause profound alterations to the morphology, clay structure, and chemical composition of the vermiculite.

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Section: Resultsmentioning

confidence: 95%

“…The RAW-VER (Fig. 4a) showed broad peak reflection at 2θ=6.15° assigned to the (002) plane, showing the characteristic basal spacing d=1.438 nm, indicating a two-water layer hydration state [58][59][60][61][62], and this is a characteristic reflection for vermiculite (PDF file 00-034-0166). The characteristic peak of the VER-MW (Fig.…”

Section: Resultsmentioning

confidence: 99%

Expansibility of vermiculite (Santa Luzia, Brazil) irradiated with microwave

et al. 2021

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“…Compound microspheres have been described by [60] this system was based on hybridization of chitosan and pal- To improve their solubility, the drug molecules can be incorporated into the interlamellar space of pure or modified clays, generating a biomaterial. This pharmaceutical form enables the uniform release of drugs in the body, maintains the therapeutic level with low oscillation, prevents toxic levels and local and systemic side effects [61]. The interaction between the components of the biomaterial formulation (drug, clay and other constituents) will determine the way and the rate with the drug is released from the matrix.…”

Section: Articles Researchmentioning

confidence: 99%

“…For the authors [4,20,46] all results suggest that it is possible to prepare nanocomposites in which their properties can be controlled by the clay content present in the nanocomposite. Nu-merous studies are reported in the literature regarding the kinetic release study profile [18][19][20][59][60][61]. In the studies ofthe kinetics of in vitro release of 10-hydroxycamptotcin from the nanocomposites were adjusted to the kinetic model of pseudo-second order.…”

Section: Articles Researchmentioning

confidence: 99%

Clays as Biomaterials in Controlled Drug Release: A Scientific and Technological Short Review

Silva

Lima

Honorio

et al. 2019

BJSTR

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fields that encompass the applications of clays are mainly in civil engineering, paper industry, effluent treatment, photocatalysis, tissue engineering, cosmetics, controlled drug release and others. These materials can be used in manipulations for drug encapsulation both for dermatological application and for oral administration, thus being important material to be exploited in various technological processes, specifically in the pharmaceutical industry [2,[4][5][6][7][8][9][10][11][12][13][14][15]. The objective of this works a bibliographical and technological prospection regarding clays and clay minerals, including their characteristics and modifications, with emphasis on their use as biomaterials, controlled release of drugs.

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“…Clay minerals are abundant in nature and are susceptible to chemical changes in their interlayer structures, in which ions, atoms, or molecules are inserted, giving them countless applications [5]. Some of the classes of clay minerals stand out for several characteristics, such as the high cation exchange capacity (CTC), expansiveness, and plasticity [6]. Vermiculite-hydrobiotite is a mineral clay that has been intensively studied considering its applications in several areas, for instance, catalytic processes, agriculture, and adsorbent for gases and pollutants, e.g.…”

Section: Introductionmentioning

confidence: 99%

Acid matrix production from treated natural vermiculite-hydrobiotite

et al. 2021

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Given the potential of acid-activated clays in adsorptive and catalytic processes, several studies focusing on acid matrices have grown over the years, making it possible to study vermiculite, a mineral composed of a type 2:1 unit cell with tetrahedral and octahedral sheets. Therefore, this work aimed to study vermiculite treated with acids for the production of matrices. In this work, the treatment of natural vermiculite-hydrobiotite, with nitric acid in concentrations of 0.25, 0.50, 0.75, and 1 mol.L -1 , followed by the dealumination process with sulfuric acid 25% v/v, aiming the production of acid matrices for applications as support for biocatalysts, chemical adsorbents, among others. The produced materials were characterized using different techniques, including X-ray fluorescence spectroscopy, X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and isotherm adsorption using the BET method. The results showed that after acid leaching the vermiculite showed a high SiO 2 content, high Brønsted and Lewis surface acidity, good adsorption/desorption performance, and significant growth of the specific surface area, qualifying the vermiculite as a promising material for future applications in catalytic and biocatalytic processes. The acid concentration had a considerable influence on the compositional and textural modification of vermiculite-hydrobiotite.

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Experimental design investigation for vermiculite modification: Intercalation reaction and application for dye removal

Cited by 24 publications

References 50 publications

Expansibility of vermiculite (Santa Luzia, Brazil) irradiated with microwave

Expansibility of vermiculite (Santa Luzia, Brazil) irradiated with microwave

Clays as Biomaterials in Controlled Drug Release: A Scientific and Technological Short Review

Acid matrix production from treated natural vermiculite-hydrobiotite

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