Modification of bentonite by combination of reactions of acid-activation, silylation and ionic exchange

D'amico, David Alberto; Ollier, Romina P.; Álvarez, Vera A.; Schroeder, Walter F.; Cyras, Viviana P.

doi:10.1016/j.clay.2014.07.002

Cited by 44 publications

(21 citation statements)

References 41 publications

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“…In consequence, the overall charge of the clay was not remarkably affected by the acid treatment, as evidenced in Figure . This result is in agreement with X‐ray fluorescence results obtained in a previous work (with the same batch of clay), which revealed a significant reduction in the amount of Ca(II) in the acid‐treated bentonite regarding to the raw Bent, as a result of partial replacing calcium ions during the acid activation treatment.…”

Section: Resultssupporting

confidence: 92%

“…In order to explain why Bent‐H produces such a marked effect while Bent cannot do it, it is important to take into account the acid modification treatment. As it was previously demonstrated by the authors, protons have replaced exchangeable cations thus increasing the amount of OH groups . These groups can form hydrogen bonding linkages to both water and PVA, producing a most remarkable effect on PVA chains mobility for PVA/Bent‐H materials than those obtained in PVA/Bent.…”

Section: Resultsmentioning

confidence: 70%

“…According to this, during freezing process ice crystals are formed in the PVA low concentration aqueous phase, whereas the other two phases are building the hydrogel network that delimitates the pores. Bent‐H has decreased water uptake capability regarding Bent, and its interaction capability through hydrogen bonding to PVA is increased. These competences would lead to a PVA even lower concentration aqueous phase, and richer PVA amorphous/crystalline phases containing the filler.…”

Section: Resultsmentioning

confidence: 99%

“…The clay employed in this work was a bentonite (Bent) supplied by Minarmco S.A. (Neuquén, Argentina). The raw clay consisted predominantly of montmorillonite . The basal spacing was 1.3 nm and its cation exchange capacity was found to be 0.939 meq g −1 .…”

Section: Methodsmentioning

confidence: 99%

“…Acid‐treated bentonite (Bent‐H) was prepared according to our previously reported technique . Bent (5 g), previously dried at 80 °C during 24 h, was dispersed in 200 mL of distilled water.…”

Section: Methodsmentioning

confidence: 99%

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Acid‐treated Bentonite as filler in the development of novel composite PVA hydrogels

Sánchez

Álvarez

Ollier

2019

J of Applied Polymer Sci

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In this study, novel eco‐friendly hydrogel adsorbents were synthesized based on poly(vinyl alcohol) (PVA) and different contents of an acid‐treated bentonite (1–5 wt %). The hydrogels were prepared by freezing–thawing, which is a simple and nontoxic method. The materials were morphologically and thermally characterized by means of swelling assays, X‐ray diffraction, scanning electron microscopy, dynamic scanning calorimetry, and thermogravimetric analysis in order to evaluate the effect of acid‐treated bentonite loading. The composite hydrogels showed very distinct porous structure and thermal features in comparison to neat PVA as a consequence of the addition of the clay. Moreover, the performance of the obtained composite hydrogels was tested toward the adsorption of cationic (methylene blue) and anionic dyes (methyl red and methyl orange) from aqueous media. The presence of acid bentonite seems to be beneficial for improving the removal capacity of PVA‐based hydrogels. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47663.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Acid‐treated Bentonite as filler in the development of novel composite PVA hydrogels

Sánchez

Álvarez

Ollier

2019

J of Applied Polymer Sci

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Improved creep performance of melt‐extruded polycaprolactone/organo‐bentonite nanocomposites

Ollier

Casado

Nicolini

et al. 2021

J of Applied Polymer Sci

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In this work, biodegradable nanocomposites based on polycaprolactone reinforced with pristine and organo‐modified bentonites are prepared by melt extrusion. Bentonite is exchanged with benzalkonium chloride (CBK) in a pilot plant scale reactor. The influence of clay type and loading on morphology, rheology, mechanical properties, and creep performance of the resulting materials is analyzed. Besides, several theoretical models then applied to experimental creep data and master curves are used to relate time and temperature with the compliance of the materials. The morphology characterization of the nanocomposites show that the organo‐modification of the clay greatly improves its dispersion in the polymer matrix. As a consequence, it is demonstrated that reinforcement of PCL with 3 wt% loading of organoclay produces the strongest improvement in creep resistance. The instantaneous creep strain and the experimental creep rate decrease more than 9% and 27%, respectively, in the range of temperatures analyzed. Moreover, the experimental values are used to adequately fit theoretical creep models for different clay loadings. On the other hand, the material with optimal creep behavior also shows the greatest improvements in tensile mechanical properties.

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The Characterization of Clay Minerals and Adsorption Mechanism onto Clays

Ismadji

Soetaredjo

Ayucitra

2015

SpringerBriefs in Molecular Science

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Modification of bentonite by combination of reactions of acid-activation, silylation and ionic exchange

Cited by 44 publications

References 41 publications

Acid‐treated Bentonite as filler in the development of novel composite PVA hydrogels

Acid‐treated Bentonite as filler in the development of novel composite PVA hydrogels

Improved creep performance of melt‐extruded polycaprolactone/organo‐bentonite nanocomposites

The Characterization of Clay Minerals and Adsorption Mechanism onto Clays

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