Mineralogy and chemistry of a new bentonite occurrence in the eastern Amazon region, northern Brazil

Moraes, Dorsan dos Santos; Angélica, Rômulo Simões; Costa, Carlos Emmerson Ferreira da; Filho, Geraldo N. Rocha; Zamian, José Roberto

doi:10.1016/j.clay.2010.02.009

Cited by 19 publications

(22 citation statements)

References 20 publications

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“…The powder X-ray diffraction patterns (Figure 1) of the raw (Ba), acidified (Bb) and functionalized bentonite (Bc), show the characteristic reflections of montmorillonite, the prevailing clay mineral; illite and quartz were observed in the raw and functionalized bentonite samples, as described by Moraes et al 2 The initial acid leaching of the raw clay caused a certain distortion of the montmorillonite structure, and the interlayered distance (d 001 ) decreased from 1.53 to 1.26 nm; additionally, the main reflection decreased in intensity and broadened (Figure 1, Bb). This distortion most likely occurred because of disorganization of the montmorillonite structural layers caused by the removal of the iron ions from the octahedral sheets and the removal of the exchangeable cations present in the interlayered region.…”

Section: Resultssupporting

confidence: 59%

“…Preparation of the functionalized materials Two types of phyllosilicates structures were utilized in the preparation of the functionalized materials: a bentonite from the Amazon region, described by Moraes et al 2 as Balsas bentonite, the structural formula of the main clay mineral present in it composition is K 0 . 3 3 C a 0 .…”

Section: Methodsmentioning

confidence: 99%

“…Thus, the discovery of new occurrences and the characterization of clay deposits are driving researchers to work with these materials in areas of industrial interest, such as catalysis. [2][3][4] The utilization of clay minerals as catalysts began in the 1930s with the use of acid leached montmorillonites in catalytic cracking of petroleum. 5 Additionally, the ability to modify the structure of these materials allowed that these substances were used as catalysts in heterogeneous processes.…”

Section: Introductionmentioning

confidence: 99%

“…2 The aim is to obtain a greater number of anchor points for a functionalizing agent, (3-mercaptopropyl)trimethoxysilane, in the natural material. The anchored mercaptopropyl groups (-SH) are then oxidized to -SO 3 H groups.…”

mentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 59%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

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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“…Dentre esses, algumas argilas industriais importantes já são conhecidas, associadas a rochas sedimentares, como os depósitos de palygorskita de Guadalupe, Formações Poti e Piauí, sudoeste do Piauí, utilizada como descorante de óleos vegetais, e lavrados desde os anos 70 [2]. Outras ocorrências como as de esmectitas das Formações Motuca e Pedra de Fogo apresentam potencial para jazimentos, porém sem notícia de explotação [3,4]. Além dessas ocorrências sedimentares já conhecidas, importantes depósitos esmectíticos residuais podem estar associados ao intemperismo de rochas máficas (basaltos) da Formação Mosquito, que ocorrem na forma de derrames, observados em vários trechos da rodovia Belém-Brasília (BR-010), próximo a divisa entre os estados do Maranhão e Tocantins e em vários trechos das rodovias estaduais que cortam, principalmente, o sul do Maranhão [3,5,6].…”

Section: Introductionunclassified

Ocorrência de uma nova bentonita brasileira nos basaltos intemperizados da formação Mosquito, bacia do Parnaíba, sul do Maranhão

et al. 2011

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ResumoNo município de Formosa da Serra Negra, sul do Maranhão, às margens da rodovia MA006, encontram-se afloramentos de basaltos intemperizados da Formação Mosquito, apresentando textura bastante argilosa e potencial de ser um material bentonítico. Neste trabalho, esse material que vem sendo considerado uma nova ocorrência de bentonita no Brasil e, batizado de Formosa, foi caracterizado por difração de raios X, fluorescência de raios X, microscopia eletrônica de varredura, espectroscopia Mössbauer e capacidade de troca catiônica, em amostra total e após separação granulométrica, e ainda, comparada com duas das principais bentonitas brasileiras, Chocolate e Bofe. Apesar das variações químicas e mineralógicas encontradas, muito comuns nesse tipo de argila, as semelhanças observadas convencem o promissor uso da argila Formosa como bentonita, uma vez que o ponto principal da caracterização está na presença dominante de montmorillonita e baixa concentração de outras fases minerais, mostrando que esse material apresenta mineralogia importante do ponto de vista tecnológico. Palavras-chave: bentonita, argila, esmectita, montmorillonita. Abstract Extensive weathered basalt outcrops can be found in the vicinities of the Formosa da Serra

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Effect of Adding Modified Clays on the Mechanical Behavior of PC/ABS Polymer Blend

Silva

Granada

Melo

et al. 2020

Macromolecular Symposia

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Bentonite clay is surface modified and incorporated into PC/ABS (70/30) polymer blend by melt mixing in concentrations of 1, 3 and 5 wt% of clay. The efficiency of the treatments is analyzed by Fourier transform infrared spectroscopy (FTIR), x‐ray fluorescence (XRF) and x‐ray diffraction (XRD). Differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) are used to evaluate the blends miscibility and morphology, respectively, and the mechanical behavior is analyzed by tensile tests. The methodologies used are efficient to modify the clay's surface. DSC and SEM showed that the blend remained immiscible with the addition of the fillers. The mechanical test showed an increase in the Young's modulus of the nanocomposite with addition of 1 wt% of the natural clay and a modification in the fracture behavior of the blend, from ductile to brittle, when 3 and 5 wt% of the organophilized clay are used.

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Mineralogy and chemistry of a new bentonite occurrence in the eastern Amazon region, northern Brazil

Cited by 19 publications

References 20 publications

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

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

Ocorrência de uma nova bentonita brasileira nos basaltos intemperizados da formação Mosquito, bacia do Parnaíba, sul do Maranhão

Effect of Adding Modified Clays on the Mechanical Behavior of PC/ABS Polymer Blend

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