Use of a Silsesquioxane Organically Modified with 4-amino-5-(4-pyridyl)-4H-1,2,4-triazole-3-thiol (APTT) for Adsorption of Metal Ions

Soares, Layciane Aparecida; Silveira, Tayla Fernanda Serantoni da; Silvestrini, Daniela Rodrigues; Bicalho, Urquisa de Oliveira; Carmo, Devaney Ribeiro do

doi:10.5539/ijc.v5n1p39

Cited by 9 publications

(5 citation statements)

References 30 publications

(31 reference statements)

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“…The FTIR spectrum of the APTT, SS, and one formed by reaction of SS with APTT (SA) and CuHSA was detailed in recent reports [27,41]. In these studies, an absence of the band at 590 cm −1 related to the C-Cl vibrations was observed as main spectral characteristic, therefore confirming the organofunctionalization of SA.…”

Section: Nuclear Magnetic Resonance (Nmr)mentioning

confidence: 74%

A Silsesquioxane Organically Modified with 4‐Amino‐5‐(4‐pyridyl)‐4H‐1,2,4‐triazole‐3‐thiol: Thermal Behavior and Its Electrochemical Detection of Sulfhydryl Compounds

Carmo

Silvestrini

Barud

et al. 2014

Journal of Nanomaterials

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The octakis(3-chloropropyl)silsesquioxane (SS) was organofunctionalized with 4-amino-5-4(pyridyl)-4H-1,2,4-triazole-3-thiol. The product formed (SA) was undergo another reactions in two steps, first with copper and so hexacyanoferrate (III) to form CuHSA. The organofunctionalized silsesquioxane was characterized by the following techniques: scanning electron microscopy (SEM), Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR) in solid state, and thermogravimetric analysis in air and nitrogen atmosphere. The composite CuHSA was incorporated into a graphite paste electrode and the electrochemical behavior studies were conducted with cyclic voltammetry. The cyclic voltammogram of the modified graphite paste electrode with CuHSA showed one redox couple with formal potentialEθ′=0.75 V versus Ag/AgCl(sat)(KCl 1.0 mol L−1;v= 20 mV s−1) attributed to the redox process Fe(II)(CN)6/Fe(III)(CN)6of the binuclear complex formed. The redox couple presents an electrocatalytic response of sulfhydryl compounds such as n-acetylcysteine and l-cysteine. For determination of n-acetylcysteine and l-cysteine the modified graphite paste electrode showed a linear region in the concentration range of 2 to 20 mmol L−1. The modified electrode was chemically and electrochemically stable and showed good reproducibility.

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Section: Nuclear Magnetic Resonance (Nmr)mentioning

confidence: 74%

A Silsesquioxane Organically Modified with 4‐Amino‐5‐(4‐pyridyl)‐4H‐1,2,4‐triazole‐3‐thiol: Thermal Behavior and Its Electrochemical Detection of Sulfhydryl Compounds

Carmo

Silvestrini

Barud

et al. 2014

Journal of Nanomaterials

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“…A copper wire was inserted through the opposite end of the glass tube to establish electrical contact. The modified paste, after homogenization, was positioned on the tube tip to avoid possible air gaps, which often enhance electrode resistance [22].…”

Section: Preparation Of the Graphite Paste Electrode Modified With CDmentioning

confidence: 99%

Preparation and use of a Grafted Silica with Imidazole Groups for Cadmium Sorption and Subsequent Voltammetric Detection of Ascorbic Acid

Silveira

Fernandes

Barbosa

et al. 2017

Silicon

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Inorganic-organic hybrid materials, such as silica gel functionalized with an organic group, offer many applications in several areas of interest. The adsorptive properties provided by these materials due to the presence of active donor atoms such as O, N and S of grafted organic groups, suggests their application in metal ions adsorption as well as in the preparation of electrochemical sensors for substances of interest. In this work a hybrid material formed by interaction of a 3-chloropropyl silica gel modified with imidazole was characterized by techniques such as infrared spectroscopy, 29 Si and 13 C nuclear magnetic resonance and analysis of surface area and porosity. Adsorption studies were carried out for cadmium (II) in different media, and the quantity of adsorbed metal increased according the following order of solvents: water < ethanol 42% < ethanol 99%. After cadmium ions adsorption, the material was reacted with potassium hexacyanoferrate forming the material CdHSGI that was incorporated into a graphite paste electrode. Electrochemical studies were conducted with cyclic voltammetry. The cyclic voltammogram showed one redox couple with average potential E θ = 0.25 V (vs Ag/AgCl, NaNO 3 1.0 mol L −1 ; v = 20 mVs −1), attributed to the Fe 2+ (CN) 6 / Fe 3+ (CN) 6 process. The modified electrode allowed the electrocatalytic ascorbic acid determination. Through voltammograms it was possible to observe a linear range from 1.0 × 10 −4 mol L −1 to 9.0 × 10 −4 mol L −1 (R = 0.996) for the ascorbic acid determination with a Devaney Ribeiro do Carmo

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“…The prepared material was oven vacuum dried at 100 °C for 4 hours. Figure 1 illustrates (Soares, Silveira, Silvestrini, Bicalho, & Do Carmo, 2013) a scheme of this syntheses:…”

Section: Preparation Of Octa-(3-chloropropyl)octasilsesquioxane With mentioning

confidence: 99%

“…The functionalization of octa-(3-chloropropyl)octasilsesquioxane (S) (Figure 1) was performed, as describe in the literature (Soares, Silveira, Silvestrini, Bicalho, & Do Carmo, 2013): reacting 9.70×10 -3 mol of S, with 8.70×10…”

Section: Preparation Of Octa-(3-chloropropyl)octasilsesquioxane With mentioning

confidence: 99%

Synthesis, Characterization and Thermal Properties of Silsesquioxane Organically Modified With 4,5-Diphenyl-2-Imidazolethiol

Carmo

Magossi²,

Bicalho³

et al. 2014

IJC

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The present paper describes the preparation of a nanostructured silsesquioxane, the octa-(3-chloropropyl)-octasilsesquioxane (S) that was organofunctionalised with the 4,5-Diphenyl-2-imidazolethiol (DIT). The modification of silsesquioxane with DIT proposed in this paper follows two steps. The composite prepared after functionalization was ascribed as SDIT. The composite SDIT and precursors were characterized by infrared (FTIR), 13 C and 29 Si Nuclear Resonance Magnetic (NMR) in solid state, Scanning Electron microscopy (SEM); X-Ray Diffraction (XRD); Energy-Dispersive X-ray spectroscopy (EDS) and Thermogravimetry. By spectroscopic analysis using above techniques, we conclude with that the SDIT synthesis was conducted with success. It was observed a cluster of particles containing cavities in an orderly fashion. The themogravimetry analyzes performed in two different atmospheres, concluding that the materials (S, DIT and SDIT) when in air atmosphere has a slower degradation process in relation to nitrogen atmosphere. The thermogravimetry of SDIT indicate a greater thermal stability in nitrogen atmosphere.

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Use of a Silsesquioxane Organically Modified with 4-amino-5-(4-pyridyl)-4H-1,2,4-triazole-3-thiol (APTT) for Adsorption of Metal Ions

Cited by 9 publications

References 30 publications

A Silsesquioxane Organically Modified with 4‐Amino‐5‐(4‐pyridyl)‐4H‐1,2,4‐triazole‐3‐thiol: Thermal Behavior and Its Electrochemical Detection of Sulfhydryl Compounds

A Silsesquioxane Organically Modified with 4‐Amino‐5‐(4‐pyridyl)‐4H‐1,2,4‐triazole‐3‐thiol: Thermal Behavior and Its Electrochemical Detection of Sulfhydryl Compounds

Preparation and use of a Grafted Silica with Imidazole Groups for Cadmium Sorption and Subsequent Voltammetric Detection of Ascorbic Acid

Synthesis, Characterization and Thermal Properties of Silsesquioxane Organically Modified With 4,5-Diphenyl-2-Imidazolethiol

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