Pillaring of saponite with zirconium oligomers

Toranzo, R.; Vicente, M.A.; Ban̄ares-Muñoz, M.A.; Gandı́a, Luis; Gil, A.

doi:10.1016/s1387-1811(98)00158-9

Cited by 40 publications

(13 citation statements)

References 69 publications

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“…However, in the case of the intercalation of the Na-clays with zirconium polycations under the reflux conditions, it must be emphasized that this method results in the total delamination of the clay structure, which becomes disordered, thus giving products on which the (001) reflection peaks disap- pear. Similar results have been reported in earlier studies using montmorillonite [15] and saponite [16], which explains the degradation of the clay structure by the quick drop of pH to low values of pH<1. However, in the present case, the pH of the intercalated solution remained the same (pH=2.8) irrespective of the method applied, whereas the destruction of the clay structure was detected only for the samples prepared by the DR method.…”

Section: -1 X-ray Diffractionsupporting

confidence: 91%

Catalytic wet peroxide oxidation of phenol over Ce-Zr-modified clays: Effect of the pillaring method

Mnasri-Ghnimi

Frini-Srasra

2014

Korean J. Chem. Eng.

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Preparation, characterization and catalytic activity of Zr-and Ce-Zr pillared clays with different method (direct, indirect, and under reflux), starting from Tunisian interstratified illite-smectite bentonite, are described. Zirconium pillared clays (Zr-PILC) revealed weaker thermal stability. To overcome this drawback, the addition of cerium (Ce) as the second metal component to Zr-PILC was attempted. Wet peroxide oxidation of phenol from industrial wastewaters was carried out over these catalysts. The catalysts were very efficient in the phenol oxidation reaction in diluted aqueous medium under mild experimental conditions (298 K and atmospheric pressure). The addition of Ce in the synthesis step of the inorganic polycations yielded a favorable effect on the pillaring of the materials, allowing the increase of the basal spacing and enhancing the catalytic activity of the solids. The pillared clays were characterized by XRD, chemical analysis, CEC, and N 2 adsorption to 77 K. The acidity of the pillared clays was calculated from the adsorbed n-butyl amine.

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Section: -1 X-ray Diffractionsupporting

confidence: 91%

Catalytic wet peroxide oxidation of phenol over Ce-Zr-modified clays: Effect of the pillaring method

Mnasri-Ghnimi

Frini-Srasra

2014

Korean J. Chem. Eng.

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“…In the natural clay mineral, this mode is observed only as a small shoulder at the same wavenumber. The increase in the intensity of this peak may be due to the exclusion of water molecules from the clay during the functionalization process, preventing H-bonding of the Mg-OH hydroxyl and suggesting interaction of the alkoxides with the OH groups of the clay, as has been previously observed during the interaction of organic compounds in sepiolite, attapulgite, and saponite [58,59]. In our case, the intensity of the peaks suggests that this interaction is much more important in the case of the amino groups than in the mercapto ones.…”

Section: Resultsmentioning

confidence: 55%

New synthesis strategies for effective functionalization of kaolinite and saponite with silylating agents

Ávila

Faria

Ciuffi

et al. 2010

Journal of Colloid and Interface Science

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“…Additionally, another report has described the immobilization of catalase on porous clay prepared by mixing acid clay with tetraethoxysilicate (TEOS) 6) . Alternatively, pillared interlayer clays (PILCs) are a class of porous, two-dimensional clays with large surface areas 3,[7][8][9][10][11][12][13][14] . PILCs are prepared by exchanging cations between the clay layers with larger, inorganic hydroxyl cations.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Enzymatic Activity of Immobilized Catalase on Calcined Montmorillonite and Pillared Interlayer Clays

Suzuki

Matsumoto

Sekikawa

et al. 2008

Japanese J. Wat. Treat. Biol.

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The application of the enzyme catalase in the textile bleaching process requires the use of catalase under high-temperature, alkaline conditions. We therefore investigated the immobilization of catalase on calcined montmorillonite and pillared interlayer clays (PILCs) as a means of increasing the enzyme's temperature and pH stabilities. SiO2-PILCs and Al2O3-PILCs were prepared from montmorillonite and were calcined at 400 or 600 ℃. The temperature stability of catalase immobilized on the clays was higher than that of free catalase up to 55 ℃. Additionally, the pH at which the catalase immobilized on the two PILCs was stable was shifted to more alkaline values compared to the pH values for free catalase. In particular, the relative activity (with 100% activity being defined as that observed at pH 7) of catalase immobilized on Al2O3-PILCs was higher than that of free catalase at pH 8-12. Furthermore, the relative activity at pH 10-11 of catalase immobilized on Al2O3-PILCs calcined at 600 ℃ was only 40-60% of that observed at pH 7 for the same PILC. However, the relative activity of catalase immobilized on calcined montmorillonite was almost the same as that of free catalase at pH ＞7.

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Pillaring of saponite with zirconium oligomers

Cited by 40 publications

References 69 publications

Catalytic wet peroxide oxidation of phenol over Ce-Zr-modified clays: Effect of the pillaring method

Catalytic wet peroxide oxidation of phenol over Ce-Zr-modified clays: Effect of the pillaring method

New synthesis strategies for effective functionalization of kaolinite and saponite with silylating agents

Adsorption and Enzymatic Activity of Immobilized Catalase on Calcined Montmorillonite and Pillared Interlayer Clays

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