2014
DOI: 10.1590/s0366-69132014000200007
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Síntese e caracterização de vermiculita mesoporosa obtida por modificação com sais complexos de alumínio e lantânio

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Cited by 5 publications
(6 citation statements)
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References 31 publications
(35 reference statements)
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“…The third event took place at 190-450 °C, which again can be explained as dehydroxylation of the material. It can be inferred that the shift toward lower temperature in the TG profile was probably due to the predisposed loss of water with a temperature that would have occurred upon clay expansion and is consistent with previously observed results [32]. Parallel to the results for NC, the EC sample showed the expected endothermic transitions within the corresponding DSC data albeit with modification of the exothermic tailing seen in the NC sample for temperatures beyond 600 °C.…”
Section: Resultssupporting
confidence: 89%
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“…The third event took place at 190-450 °C, which again can be explained as dehydroxylation of the material. It can be inferred that the shift toward lower temperature in the TG profile was probably due to the predisposed loss of water with a temperature that would have occurred upon clay expansion and is consistent with previously observed results [32]. Parallel to the results for NC, the EC sample showed the expected endothermic transitions within the corresponding DSC data albeit with modification of the exothermic tailing seen in the NC sample for temperatures beyond 600 °C.…”
Section: Resultssupporting
confidence: 89%
“…It was possible to observe peaks at 3.02º, 41.02º, and 43.96º 2θ, corresponding to basal distances of 29.23, 1.17, and 2.78 Å, respectively, which may be further illustrative of the mineral hydrobiotite, which is formed in the conversion process to vermiculite and is ascribed to the hydration of phlogopite/biotite by weathering water on the surface of weathered rocks [29]. The presence of quartz was identified by peaks at 22.70° (3.4 Å) and 28.84º (3.0 Å), whose main peak is at 3.4 Å according to the reference file ICSD 01-079-1910, which confirmed other works [27,28,[31][32][33].…”
Section: Resultssupporting
confidence: 82%
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“…With insertion of VMT, new spikes occurred in 2θ, equal to 6,48° and 7,37°, 18,05° and 24,29°2 9,30 . It was observed that with the higher incorporation of VMT content there was an increase in the intensity of these spikes, which indicated the presence of charge in the material structure.…”
Section: X-ray Diffractionmentioning
confidence: 99%
“…Pelo exposto, as APs podem ser definidas como sendo materiais que possuem porosidade permanente devido a introdução de compostos químicos que atuam como pilares que mantem as lamelas da argila afastadas, resultando na formação de microporos (LUNA; SCHUCHARDT, 1999). Os argilominerais do grupo das esmectitas, com destaque para a montmorilonita, são os mais utilizados na pilarização, porém, outros argilominerais, como beidelita, saponita, vermiculita e hectorita também podem ser utilizados com sucesso nesse processo (CHEVALIER et al, 1994;KLOPROGGE;FROST, 1999;SILVA, 2014).…”
Section: Fontes Alternativas De Fertilizantes Fosfatadosunclassified