Adsorption Essays of Palladium in Modified Silica Gel With Thiouronium Groups: Experimental and Theorical Studies

G, Alexander Carreño; Schott, Eduardo; B, Ximena Zárate; Arratia‐Pérez, Ramiro; K, Juan Carlos Vega De; L, Miguel Mardones; Manríquez, J.; M, Ivonne Chávez

doi:10.4067/s0717-97072011000200015

Cited by 8 publications

(3 citation statements)

References 46 publications

(64 reference statements)

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“…Silanol asymmetric stretching intensity increased with the amount of MTS in the formulation. Another peak at 471 cm -1 in MTS due to O-Si-O bending 36 prominently observed in the formulations. The small changes in the band intensity, band orientation and overlapping indicated only van der Waals or dipole-dipole interactions between ibuprofen and magnesium trisilicate molecules.…”

Section: Ftir Analysismentioning

confidence: 90%

Infrared spectroscopy for analysis of co-processed ibuprofen and magnesium trisilicate at milling and freeze drying

Acharya¹,

Mishra²,

Sahoo³

et al. 2017

ACSi

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Assessment of interactions of ibuprofen and magnesium trisilicate after co-processing has been carried out by infrared spectroscopy. Dry-state ball-milling and, aqueous state kneading and freeze-drying were performed. FTIR spectroscopy of co-processed materials described acid-base reaction between the carboxylic acid containing ibuprofen to a significant extent. Increased absorbance of carboxylate peak accompanied by a consistently reduced absorbance of the carbonyl acid peak was evident. Absorbance of carboxylate peak was more in freeze-dried sample compared to milled product. Intermolecular hydrogen bonding between ibuprofen and magnesium trisilicate in the co-processed material has been suggested. Inhibition of crystal morphology has been noticed in the photomicrographs of both the products. DSC report has shown absence or significantly decreased melting endotherm representing almost complete amorphization of ibuprofen. Release of drug increased greatly after co-processing in comparison to crystalline ibuprofen. Freeze-dried samples have improved drug release more significantly compared to ball-milled samples.

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Section: Ftir Analysismentioning

confidence: 90%

Infrared spectroscopy for analysis of co-processed ibuprofen and magnesium trisilicate at milling and freeze drying

Acharya¹,

Mishra²,

Sahoo³

et al. 2017

ACSi

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show abstract

“…The effect of modifying functional groups on the adsorption properties of silicas and the catalytic activity of deposited metal phases on such supports is of particular interest [14][15][16][17][18][19][20][21][22][23][24][25]. Various combinations in the modification of supports open up wide possibilities for the obtainment of new and more efficient catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…According to the results obtained, modified silica adsorbed 2-chloro-4-methoxyphenol in larger amounts than unmodified silica. Modified silicas can also have a good ability to adsorb Group VIII metals, such as palladium [23]. This fact leads to the expectation that metals, such as palladium, will be more efficiently immobilized on organomodified silicas due to additional coordination interactions with the functional groups of the support matrix.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Synthesis of Organically Modified Silica Particles as Efficient Palladium Catalyst Supports to Perform Hydrogenation Process

et al. 2021

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Modern approaches to the production of new materials require the improvement of synthesis techniques towards simplifying the processes of their preparation and reducing the number of stages. Thus, in this study, one-stage synthesis of organomodified silica materials is developed using a special surfactant—dodecyldimethylamin N-oxide (DDAO). The peculiarity of this approach is that there is no need for heat treatment of the material, since DDAO is removed by washing in alcohol. Amino-, mercapto-, methyl-, and phenyl-modified silicas were synthesized using this method. The SEM images showed the morphology of all the obtained materials is close, all particles are spherical, and the diameter of individual particles is about 500 nm. Palladium particles were precipitated on these supports, then the experiments were carried out to study the catalytic activity of these materials in a model reaction of nitroaniline reduction. The phenyl modified matrix-based materials showed very low activity. This is due to the fact that the support and the substrate contain aromatic fragments, thus, hydrophobic interactions arise between them, which complicates the diffusion of the products. The leader is a matrix with an amino fragment, which is associated with its electron-donor effect. The XPS method revealed the amount of fixed palladium, as well as the binding energy shifts, which are 0.68 eV for 5% Pd/SiO2–C6H5; 0.56 eV for 5% Pd/SiO2–C3H6–NH2; 0.26 eV for 5% Pd/SiO2–CH3; and 0.13 eV for 5% Pd/SiO2.

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DFT studies on coordination models for adsorption essays of Cu(II) and Ni(II) solutions in modified silica gel with iminodiacetic groups

et al. 2016

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Adsorption Essays of Palladium in Modified Silica Gel With Thiouronium Groups: Experimental and Theorical Studies

Cited by 8 publications

References 46 publications

Infrared spectroscopy for analysis of co-processed ibuprofen and magnesium trisilicate at milling and freeze drying

Infrared spectroscopy for analysis of co-processed ibuprofen and magnesium trisilicate at milling and freeze drying

Sol-Gel Synthesis of Organically Modified Silica Particles as Efficient Palladium Catalyst Supports to Perform Hydrogenation Process

DFT studies on coordination models for adsorption essays of Cu(II) and Ni(II) solutions in modified silica gel with iminodiacetic groups

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