Brazilian organoclays as nanostructured sorbents of petroleum-derived hydrocarbons

Pereira, Kleberson Ricardo de Oliveira; Hanna, Rosângela Abdala; Vianna, Marilda Mendonça Guazzelli Ramos; Pinto, Carolina A.; Rodrigues, Meiry Gláucia Freire; Valenzuela‐Díaz, Francisco Rolando

doi:10.1590/s1516-14392005000100014

Cited by 54 publications

(28 citation statements)

References 9 publications

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“…The properties associated with some inorganic solids having organic guest molecules incorporated on the established inorganic layer through immobilization processes leads to new organofunctionalized compounds, which have attracted great attention from both scientific and practical viewpoints [1][2][3][4] . In this context, the grafting involves organosilanes that enable covalent bond formations with available reactive surface groups.…”

Section: Introductionmentioning

confidence: 99%

Inorganic-organic hybrids originating from organosilane anchored onto leached vermiculite

2013

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The reactivity of clay minerals leached in grafting reactions was investigated. Precursor solids were prepared by treating the sodium vermiculites with nitric acid solutions at several concentrations. The lixiviation produced the restructured porous solids with surface area over a wide range, varying from 133 to 673 m 2 g -1 . The sodium and lixiviated vermiculites reacted covalently with silylating agent, 3-aminopropyltrimethoxysilane, to attach this agent onto the inorganic surface, through the free available silanols. The products were characterized by CNH elemental analysis, infrared spectroscopy, X-ray diffraction, nuclear magnetic resonance in the solid state for carbon and silicon. CHN data expressed by significant contents of anchored organic chains, up to 2.14 mmol g -1 , as the degree of leaching was increased. The success of this investigation is directly related to the leaching of the natural vermiculite, which is strongly influenced by the reactivity of the abundant original source.

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Section: Introductionmentioning

confidence: 99%

Inorganic-organic hybrids originating from organosilane anchored onto leached vermiculite

2013

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“…While working with clays from Paraiba, Pereira et al (2005) 39 also obtained intermediate values in gasoline expansion, whereas Vianna (2005) 40 attained improved expansion levels reaching high levels for some of the treatments and quaternary ammonium salts used in the preparation of his clays. Figure 6 shows sorption test results.…”

Section: Petroleum-derived Sorptionmentioning

confidence: 99%

Characterization of Brazilian Bentonite Organoclays as sorbents of petroleum-derived fuels

Bertagnolli

Silva

2012

Mat. Res.

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This work focused on preparing and characterizing Brazilian bentonite clay through the use of quaternary ammonium salt so as to apply it as a sorbent for petroleum-derived fuels. Bentonite clay was organophilizated by the intercalation of quaternary ammonium salts such as cetyl-pyridinium chloride and benzalkonium chloride. The resulting materials were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, N 2 physisorption and infrared spectroscopy techniques. The clay similarity with petroleum-derived fuels, gasoline and diesel oil were defined by sorption and swelling tests. The increase in basal spacing and the appearance of absorption bands related to the CH 2 and CH 3 groups confirm the efficiency of Brazilian organoclays. Removal percentages between 50 and 60 for benzene, toluene and xylene indicate the potential of organoclay in the remediation of areas contaminated by petroleum-derived fuels.

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“…The sample mixture composed of the two salts was prepared by adding a dispersion of 10.2 g of salt DSDMAC and 10.2 g of salt ADMBAC. The method used in this work corresponds to a modification of the one proposed by Valenzuela-Diaz (2001), named "direct method", which was developed by Pereira et al (2005). It presents as main advantage the reduction of the preparation time to 1 day, since the steps comprising the 24-h settling periods are not performed.…”

Section: Preparation Of the Samplesmentioning

confidence: 99%

“…Afterwards, the content of the test tube was stirred with a glass stick during 5 min and, after a further 24-h settling period, a new reading of the clay column volume (swelling of the clay with agitation) was done. The following parameters have been fixed for the interpretation of the test: non-swelling (minor or equal to 2 ml/g of the clay), low swelling (between 3 and 5 ml/g of the clay), intermediate swelling (between 6 and 8 ml/g of the clay) and high swelling (more than 8 ml/g of the clay) (Pereira et al, 2005).…”

Section: Foster Swelling Testmentioning

confidence: 99%

Oil–water separation process with organoclays: A comparative analysis

Mota

Rodrigues

Machado

2014

Applied Clay Science

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Brazilian organoclays as nanostructured sorbents of petroleum-derived hydrocarbons

Cited by 54 publications

References 9 publications

Inorganic-organic hybrids originating from organosilane anchored onto leached vermiculite

Inorganic-organic hybrids originating from organosilane anchored onto leached vermiculite

Characterization of Brazilian Bentonite Organoclays as sorbents of petroleum-derived fuels

Oil–water separation process with organoclays: A comparative analysis

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