Copper Hexacyanoferrate Formation on the Modified Silica Surface with DAB‐Am‐16 Dendrimer

Carmo, Devaney Ribeiro do; Gabriel, Suelino; Bicalho, Urquisa Oliveira; Picon, Carlos Alberto; Paim, Leonardo Lataro

doi:10.1002/masy.200900097

Cited by 6 publications

(9 citation statements)

References 21 publications

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“…The formal potential (E ½ ox ) (E ½ ox = E pa + E pc /2 where E pa and E pc are anodic and cathodic peak potentials) of CuDPPIPS was of 0.24 V vs SCE (1.0 mol.L -1 NaCl; pH 6; v = 40 mV/s -1 ). The observed peak to peak separation of CuDPPIPS (∆Ep = E pa -E pc ) was of 0.23 V. An additional break shoulder reduction peak it was observed at 0.21 V, which was attributed to a catalysed Cu 2+ /Cu + process 20 due to potential range studied (-0.25 to 1.2 V) the DPPIPS is electroinactive (Figure 5a). …”

Section: Resultsmentioning

confidence: 90%

“…It is well knowledge which the copper ions are electrochemically inactive in the used potential window and was very interesting to note a presence of redox process. This redox process was attributed at Cu 0 /Cu 2+ of the complexed copper with dipolypropylenetriamine (dpt) ligand 20 . The formal potential (E ½ ox ) (E ½ ox = E pa + E pc /2 where E pa and E pc are anodic and cathodic peak potentials) of CuDPPIPS was of 0.24 V vs SCE (1.0 mol.L -1 NaCl; pH 6; v = 40 mV/s -1 ).…”

Section: Resultsmentioning

confidence: 99%

“…The other reagents and solvents were of analytical grade (Sigma-Aldrich, Merck) and were used as purchased. The reaction of 3-Chloropropylsilica gel whit DAB-Am-16 was carried out as described in the literature 20 . In a typical functionalization step, 5 g of 3-chloropropyl silica gel, previously degassed under vacuum (10 −3 torr) at room temperature, was immersed in methanol (25 mL) and 0.01 mol DAB-Am-16 was added.…”

Section: Reagentsmentioning

confidence: 99%

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Investigation about the copper adsorption on the chloropropylsilica gel surface modified with a nanostructured dendrimer DAB-Am-16: an analytical application for determination of copper in different samples

Carmo

Paim

2012

Mat. Res.

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The third generation (G-3) poly(propyleneimine)hexadecaamine dendrimer (DAB-Am-16) was grafted onto the chloropropylsilica gel surface (DPPIPS). The modified silica (DPPIPS) was characterized by Electronic (Uv-Vis), vibrational and Electron Paramagnetic Resonance (EPR), spectrocopies, surface area (331.07 m 2 .g -1) and porosity analyses (pore diameter of 41.9 nm) and cyclic voltammetry technique. The copper adsorption studies were performed using a batchwise process and the DPPIPS showed adsorption capacities of 16.3, 47.8 and 659.5 mol.g -1 in aqueous, ethanol and acetone medium, respectively, with recoveries close to 100% after percolation with HCl 1.0 mol.L -1 . The results suggest that the sorption of copper ions on DPPIPS occurs mainly by surface complexation and a Langmuir model allowed describing the sorption of the metal ions on DPPIPS. As an application of this chemically modified material, copper was determined in real samples of distilled spirits and fuel alcohol.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Reagentsmentioning

confidence: 99%

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Investigation about the copper adsorption on the chloropropylsilica gel surface modified with a nanostructured dendrimer DAB-Am-16: an analytical application for determination of copper in different samples

Carmo

Paim

2012

Mat. Res.

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“…Actually, in modified electrodes is divided into analysis with preconcentration using the technique of anodic stripping (Jaafariasl, Shams, & Amini, 2011;Torabi, Shams, Zolfigol, & Afshar, 2006), or as a substrate for incorporation of redox mediators (do Carmo, Gabriel, Bicalho, Picon, & Paim, 2011;Shams, Babaei, Taheri, & Kooshki, 2009). …”

Section: Introductionmentioning

confidence: 99%

Electrocatalitic Detection of Hydrazine Using Chemically Modified Electrodes with Cobalt Pentacyanonitrosylferrate Adsorbed on the 3–Aminopropylsilica Surface

Sá¹,

Maraldi²,

Bonfim³

et al. 2017

IJC

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Cobalt pentacyanonitrosylferrate on the aminopropylsilica silica gel surface (SiCoNP) was previously prepared following two steps. The electrochemical behavior of SiCoNP modified electrode showed two redox couples, the first and second redox couples were observed at anodic potential (Epa) 1 = 0.36 and 0.60 V vs. Ag/AgCl attributed to the oxidation of Co (II) to Co (III) and Fe (II) (CN) 5 NO/Fe (III) (CN) 5 NO, respectively. The modified carbon paste electrode with SiCoNP was tested in the hydrazine electrooxidation. In the hydrazine electrooxidation, the H + release was observed and the two metal centers are involved in this process. The proposed mechanism has been described and based on studies of the effect of hydrogen ion concentration in the redox process of bivalent compound formed. Thus a large increase in hydrogen ion concentration promotes the formation of an intermediate electroactive species with an anodic peak at 0.56 V. The nature of this species is not well established but may be related to protonation of cyanide or NO groups present. The modified graphite paste electrode presented a limit of detection of 2.38×10 -4 mol L -1 and amperometric sensitivity of 1.37×10 -6 A.mol -1 .L.

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“…In the present study, the poly(propylene)imine hexadecylamine dendrimer (DAB-Am-16) was anchored [24] on the surface of 3-chloropropylsilyl silica gel generating the composite (SD). DAB-Am-16 consists of a polar core and an apolar periphery [25], there are three generations of branches, and the outermost shell is composed of 16-NH 2 groups.…”

Section: Introductionmentioning

confidence: 99%

Voltammetric Study of the Copper Pentacyanonitrosylferrate Adsorbed on the Silica Modified with a Poly(propylene)imine Hexadecylamine Dendrimer for Determination of Nitrite

Carmo

Gabriel

Silvestrini

et al. 2012

International Journal of Electrochemistry

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Poly(propylene)imine hexadecylamine dendrimer (DAB-Am-16) was anchored on the surface of 3-chloropropylsilyl silica gel and subsequently interacted with copper nitroprusside. The composite was characterized by infrared (FTIR), energy dispersive X-ray (EDX), and cyclic voltammetry. The above techniques confirmed the successful anchoring of the dendrimer on the silica gel modified surface and its interaction with copper nitroprusside. The cyclic voltammogram of CuNPSD was found to exhibit two redox couples with (Eθ′)1= 0.30 V and (Eθ′)2= 0.78 V versus Ag/AgCl ( mol L−1; mV s−1) attributed to the redox processes and , respectively. The CuNPSD-modified graphite paste electrode was found to show a linear response of to mol L−1for nitrite determination with a detection limit (DL) of mol L−1and an amperometric sensitivity of 25.0 mA/mol L−1. The CuNPSD-modified graphite paste electrode was found to show a good electrochemical stability and an excellent response to the electrocatalytic oxidation of sodium nitrite.

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Copper Hexacyanoferrate Formation on the Modified Silica Surface with DAB‐Am‐16 Dendrimer

Cited by 6 publications

References 21 publications

Investigation about the copper adsorption on the chloropropylsilica gel surface modified with a nanostructured dendrimer DAB-Am-16: an analytical application for determination of copper in different samples

Investigation about the copper adsorption on the chloropropylsilica gel surface modified with a nanostructured dendrimer DAB-Am-16: an analytical application for determination of copper in different samples

Electrocatalitic Detection of Hydrazine Using Chemically Modified Electrodes with Cobalt Pentacyanonitrosylferrate Adsorbed on the 3–Aminopropylsilica Surface

Voltammetric Study of the Copper Pentacyanonitrosylferrate Adsorbed on the Silica Modified with a Poly(propylene)imine Hexadecylamine Dendrimer for Determination of Nitrite

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