Anisotropic self-organization of hybrid silica based xerogels containing bridged positively charged 1,4-diazoniabicycle[2.2.2]octane chloride group

Arenas, Leliz Ticona; Pinheiro, A. C.; Ferreira, Juliana D.; Livotto, Paolo Roberto; Pereira, Vitor Paulo; Gallas, Márcia Russman; Gushikem, Yoshitaka; Costa, Tânia Maria Haas; Benvenutti, Edílson V.

doi:10.1016/j.jcis.2007.09.073

Cited by 26 publications

(18 citation statements)

References 46 publications

(57 reference statements)

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“…1. The observed chemical shifts (ppm) and the respective assignments [29,49,50] are listed in Table 2. Immobilized DbCl on both matrices show peaks at $45 ppm assigned to the C atom of -OCH 3 group that was not hydrolyzed during the functionalization process.…”

Section: Resultsmentioning

confidence: 99%

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Surface functionalization of SBA-15 and a nonordered mesoporous silica with a 1,4-diazabicyclo[2.2.2]octane derivative: Study of CuCl2 adsorption from ethanol solution

Maroneze

Magosso

Panteleimonov

et al. 2011

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 99%

“…29 2 ]. T species refer to Si atoms bonded to C atoms of the n-propyl bridge of the DbCl functional groups [49]. The values of chemical shift and the corresponding assignments are shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Surface functionalization of SBA-15 and a nonordered mesoporous silica with a 1,4-diazabicyclo[2.2.2]octane derivative: Study of CuCl2 adsorption from ethanol solution

Maroneze

Magosso

Panteleimonov

et al. 2011

Journal of Colloid and Interface Science

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“…Ionic silsesquioxane w hi ch cont ains the 1,4-diazoniabicyclo[2.2.2]octane chloride group was prepared according to previous report [50]. Other reagents used were as follows: tetraethyl orthosilicate (TEOS) (Aldrich, 98 %), methanol (Merck, 99.8 %), ethanol (Merck, 99.9 %), copper phthalocyanine-3,4′,4″,4‴-tetrasulfonic acid tetrasodium salt (CuTsPc) (Aldrich, 85 %), g raphite po wd er (Aldric h, 99.9 9 %), hydrofluoric acid (HF) (Merck), and dopamine hydrochloride (Sigma, 98 %), all analytical grade.…”

Section: Chemicalsmentioning

confidence: 99%

“…The synthesis of the ionic silsesquioxane which contains the 1,4-diazoniabicyclo[2.2.2]octane chloride group (SiDbCl 2 ) was already reported [50] and a representation of its structure is shown in Supplementary material.…”

Section: Synthesis and Characterization Of The Materialsmentioning

confidence: 99%

Mesoporous silica xerogel modified with bridged ionic silsesquioxane used to immobilize copper tetrasulfonated phthalocyanine applied to electrochemical determination of dopamine

Deon

Caldas

Rosa

et al. 2014

J Solid State Electrochem

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Silica xerogel was modified with an ionic s i l s e s q u i o x a n e c o n t a i n i n g t h e c a t i o n i c 1 , 4 -diazoniabicyclo[2.2.2]octane bridged group and it was used as matrix for immobilization of copper tetrasulfonated phthalocyanine, resulting in Si/Db/CuTsPc material. This material was characterized by ultraviolet-visible and infrared spectroscopy, elemental and thermogravimetric analyses, nitrogen adsorption-desorption isotherms, and scanning electron microscopy. The Si/Db/CuTsPc material was used to develop a carbon paste electrode for dopamine determination. The electrochemical behavior of dopamine was evaluated by cyclic voltammetry and chronoamperometry. The optimal experimental conditions were determined (pH=4.5 and oxygen atmosphere) using a 0.1 mol L −1 phosphate buffer solution. The carbon paste electrode modified with the Si/Db/CuTsPc material shows a linear response for current intensity with the dopamine concentration in the range of 0.010 to 0.107 mmol L −1 . The detection limit was 0.42 μmol L −1 , and the sensitivity was 7.15 μA (mmol L −1 ) −1 , making the system promising to be applied as electrochemical sensor for dopamine.

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“…Table 3 summarizes the values of the peak assignments of the C in ppm. Assignments of 13 C peaks for pure cellulose and the final products were made based on refs (Arenas et al 2008) and (Kono et al 2002). Figures 4 and 5 show the SEM and the corresponding EDS images for CelAl/DbCl 2 and CelacAl/DbCl 2 .…”

Section: Characterization Of the Materials Obtainedmentioning

confidence: 99%

New promising composite materials useful in the adsorption of Cu(II) in ethanol based on cellulose and cellulose acetate

et al. 2012

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This work describes for the first time the synthesis and characterization of new promising materials based on cellulose (Cel) and cellulose acetate (Celac), previously modified with aluminum oxide (CelAl and CelacAl) and post functionalized with 1,4-diazabicyclo [2.2.2] octane-n-propyltrimethoxysilane chloride (SiDbCl 2 ), resulting the chemically modified hybrid materials CelAl/SiDbCl 2 and CelacAl/SiDbCl 2 . The materials have shown to be useful in the adsorption of CuCl 2 from ethanol, presenting high effective adsorption capacity. In the adsorption process, the copper ions diffuse into the solid solution interface and are retained as anionic complexes CuCl 3 -or CuCl 4 2-. An expressive effective adsorption capacity t Q , as well as the stability constants b 1 and b 2 , were found for both adsorbents: (a) CelAl/DbCl 2 : t Q = 0.33 9 10 -3 mol g -1 , log b 1 = 4.23 (±0.04) and log b 2 = 6.99 (±0.03);(b) CelacAl/DbCl 2 : t Q = 0.48 9 10 -3 mol g -1 , log b 1 = 5.1 (±0.1) and log b 2 = 8.3 (±0.1). Both adsorbent materials are potentially useful in the pre-concentration and further analysis of Cu(II) present in trace amounts in ethanol, extensively used as an automotive fuel in Brazil. Regeneration of the adsorbents requires a very simple procedure consisting in their immersion in aqueous solution which causes the immediate release of the Cu(OH 2 ) n 2? species to the solution phase.

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Anisotropic self-organization of hybrid silica based xerogels containing bridged positively charged 1,4-diazoniabicycle[2.2.2]octane chloride group

Cited by 26 publications

References 46 publications

Surface functionalization of SBA-15 and a nonordered mesoporous silica with a 1,4-diazabicyclo[2.2.2]octane derivative: Study of CuCl2 adsorption from ethanol solution

Surface functionalization of SBA-15 and a nonordered mesoporous silica with a 1,4-diazabicyclo[2.2.2]octane derivative: Study of CuCl2 adsorption from ethanol solution

Mesoporous silica xerogel modified with bridged ionic silsesquioxane used to immobilize copper tetrasulfonated phthalocyanine applied to electrochemical determination of dopamine

New promising composite materials useful in the adsorption of Cu(II) in ethanol based on cellulose and cellulose acetate

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