Synthesis of new porous clay heterostructures: The influence of co-surfactant type

Gârea, Sorina Alexandra; Mihai, A.I.; Vasile, Eugeniu; Nistor, Cristina Lavinia; Sârbu, Andrei; Mitran, Raul−Augustin

doi:10.1016/j.matchemphys.2016.04.056

Cited by 20 publications

(11 citation statements)

References 40 publications

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“…The most of PCHs are synthesized using hexadecyltrimethylammonium cations (HDTMA + ) to expand the interlayer space (Table ). Several authors have pointed out that the basal spacing increase is in the range 1.7–2.2 nm for laponite, saponite and montmorillonite ,,. These data are in agreement with a commercial organoclay such as Cloisite 30B .…”

Section: Porous Clay Heterostructuressupporting

confidence: 80%

Synthesis, Characterization, Uses and Applications of Porous Clays Heterostructures: A Review

Cecilia

García‐Sancho

Vilarrasa-García

et al. 2018

The Chemical Record

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Porous clay heterostructures (PCH) are obtained by the insertion of an organic bulky cation in the interlayer spacing of a smectite, causing a swelling of the clay mineral. Right after, oxides species, mainly silicon oxide, are incorporated as pillars galleries between adjacent layers to form a porous structure after the removal of the template. The ordering of the clay mineral as well the organic cation incorporated in the synthetic step favors the modulation of the textural properties of the PCH. In addition, the incorporation of heteroatoms in the pillars galleries can also modulate the acidity of the PCH. The modulation of the pore size and the acid properties provides to these materials a wide range of applications in the fields of adsorption and catalysis. This paper carries out a detailed review of the synthesis of PCH, characterization as well as uses and application reported in the literature.

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Section: Porous Clay Heterostructuressupporting

confidence: 80%

Synthesis, Characterization, Uses and Applications of Porous Clays Heterostructures: A Review

Cecilia

García‐Sancho

Vilarrasa-García

et al. 2018

The Chemical Record

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“…After introducing organic moieties (HDTMA and TEOS), the strong vibration attributed to Si-O at 998 cm −1 shifted to 1036 cm −1 due to the increment in amorphous silica contents during the preparation of PCH [ 56 ]. Additionally, the new vibrations were developed at 1222, 1371, and 1744 cm −1 which were assigned as C-N, aliphatic C-H, and C-O vibrations by introducing HDTMA, respectively [ 57 ]. The alginate powder shows characteristic asymmetric and symmetric stretching vibration of the carboxylate group (COO − ) in alginate at 1408 and 1594 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Porous Clay Heterostructure with Alginate Encapsulation for Toluene Removal

Son

Kim

et al. 2021

Nanomaterials

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A volatile organic compound adsorbent based on a porous clay heterostructure (PCH) with alginate biopolymer was successfully prepared. From N2 adsorption–desorption analysis, the specific surface area, pore volume, and pore size of bentonite were dramatically increased after introducing the porous structure. Following complexation with alginate (Alg-PCH), the pore volume and pore size were not significantly affected by pore structure. The thermal stability of Alg-PCH shows enhanced thermal stability compared to alginate and alginate beads. The morphology layered structure of Alg-PCH was carried out by transmission electron microscopy (TEM), suggesting the disorder and re-order of the c-axis layer stacking by porous structure and complexation with alginate, respectively, which was well-matched with X-ray diffraction results. To optimize the preparation of Alg-PCH, various reaction conditions (alginate, CaCl2 concentration, bead size, and weight ratio between alginate and PCH) were utilized. According to the toluene adsorption–desorption experiments, the preparation conditions for Alg-PCH were selected as a 2 mm extrusion tip, 0.5% of alginate, and 2% of CaCl2 solution with a 1:50 alginate:PCH weight ratio. Additionally, it shows 61.63 mg/g adsorption capacity with around 49% desorption efficacy under atmospheric temperature and pressure.

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“…The modification of PCHs was firstly highlighted using FTIR spectrometry ( fig.2). FTIR spectrum of unmodified PCH exhibits the following characteristic peaks: 3738 cm -1 (vibrations of isolated terminal silanol groups), 3649 cm -1 (vibration of geminal and associed terminal silanol groups), 3440 cm -1 (hydroxyl group stretching vibrations of water molecules adsorbed on PCH), 1630 cm -1 (bending vibration of adsorbed water molecules), 1084 cm -1 (formation of three dimensional silica network) [5,6]. The modification of PCH with silane coupling agents (APTES and GPTMS) was highlighted by the apearance of new peaks at 2927 cm -1 (APTES) and 2951 cm -1 (GPTMS) attributed to the streaching vibrations of C-H from CH 2 groups of the coupling agents.…”

Section: Results and Discussion Characterization Of Functionalized Pmentioning

confidence: 99%

“…Porous clay heterostructures (PCHs) are innovative materials that combine microporosity and mesoporosity [1]. The versatile properties such as high textural properties (surface area, total volume pore, pore size distribution), high thermal stability and adsorption capacity and surface acidity of PCHs recommend these materials in a wide range of applications such as: carriers, adsorbents, catalysts, decontamination agents and encapsulation agents [2][3][4][5][6].…”

Section: Abstract: Porous Clay Heterostructures (Pch) 3-aminopropyl-mentioning

confidence: 99%

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Functionalization of Porous Clay Heterostructures with Silane Coupling Agents

Mihai¹,

Gârea²,

Vasile³

et al. 2017

Mat.Plast.

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The goal of this paper was to study the modification of porous clay heterostructures (PCHs) with various silane coupling agents. Two commercial coupling agents (3-aminopropyl-triethoxysilane (APTES) and 3-glycidoxypropyl-trimethoxysilane (GPTMS)) with different functional groups (amine and epoxy groups) were used as modifying agents for the PCHs functionalization. The functionalization of PCH with APTES and GPTMS was evaluated by Fourier transform infrared (FTIR) spectrometry, thermogravimetric analysis (TGA), X-Ray Diffractions (XRD) and BET Analysis. FTIR spectra of modified PCHs confirmed the presence of characteristic peaks of silane coupling agents. TGA results highlighted an increase of weight loss for the modified PCHs that was assigned to the degradation of silane coupling agents (APTES and GPTMS) attached to the PCHs. The XRD results showed that the structure of modified PCHs was influenced by the type of the silane coupling agent. The functionalization of PCHs with silane coupling agents was also confirmed by BET analysis. Textural parameters (specific surface area (SBET), total pore volume (Vt )) suggested that the modified PCHs exhibit lower values of SBET and a significant decrease of total pore volume than unmodified PCHs.

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Synthesis of new porous clay heterostructures: The influence of co-surfactant type

Cited by 20 publications

References 40 publications

Synthesis, Characterization, Uses and Applications of Porous Clays Heterostructures: A Review

Synthesis, Characterization, Uses and Applications of Porous Clays Heterostructures: A Review

Porous Clay Heterostructure with Alginate Encapsulation for Toluene Removal

Functionalization of Porous Clay Heterostructures with Silane Coupling Agents

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