Preparation of a poly-alkylamine surface-functionalized carbon with excellent performance as a Pd(II) scavenger

Peñas-Sanjuán, Antonio; López‐Garzón, Rafael; López-Garzón, J.; Pérez-Mendoza, Manuel; Bazzicalupi, Carla

doi:10.1016/j.carbon.2012.01.022

Cited by 16 publications

(16 citation statements)

References 8 publications

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“…Nevertheless, most of the adsorbents do not provide specific interactions with the targeted metal ions so that their adsorption capacity and selectivity are very low. Thus, the functionalization of different adsorbents with suitable ligands has been successfully used for the selective removal of metal ions [19][20][21]. In this context the design and synthesis of new ligands capable of binding metal ions are of considerable interest.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of trihydroxamic acid functionalized carbon materials for the removal of Cu(II) ions from aqueous solution

Godino-Salido

Santiago-Medina

López‐Garzón

et al. 2016

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of trihydroxamic acid functionalized carbon materials for the removal of Cu(II) ions from aqueous solution

Godino-Salido

Santiago-Medina

López‐Garzón

et al. 2016

Applied Surface Science

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“…The spectra of the free HBPEIs have been already reported. [38,55] All these spectra of the hybrids contain an asymmetric peak at 399.4 eV. It can be deconvoluted into symmetric peaks which are described by Gaussian–Lorentzian functions.…”

Section: Resultsmentioning

confidence: 99%

“…they can behave as poly-chelatogens. [38] Also regarding their chelating properties, it is known that branched PEIs form more stable metal complexes than LPEIs due to entropic factors. [39] Thus, the covalent attachment of these polyamines to the surface of carbon materials can result in stable hybrid materials which can capture relevant amounts of metal ions by coordination given that the properties of the polyamines are preserved in the hybrids.…”

Section: Introductionmentioning

confidence: 99%

Grafting the surface of carbon nanotubes and carbon black with the chemical properties of hyperbranched polyamines

Morales-Lara

Domingo-Garcı́a

López‐Garzón

et al. 2016

Science and Technology of Advanced Materials

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Controlling the chemistry on the surface of new carbon materials is a key factor to widen the range of their applicability. In this paper we show a grafting methodology of polyalkylamines to the surface of carbon nanomaterials, in particular, carbon nanotubes and a carbon black. The aim of this work is to reach large degrees of covalent functionalization with hyperbranched polyethyleneimines (HBPEIs) and to efficiently preserve the strong chelating properties of the HBPEIs when they are fixed to the surface of these carbon materials. This functionalization opens new possibilities of using these carbon nanotubes-based hybrids. The results show that the HBPEIs are covalently attached to the carbon materials, forming hybrids. These hybrids emerge from the reaction of amine functions of the HBPEIs with carbonyls and carboxylic anhydrides of the carbon surface which become imine and imide bonds. Thus, due to the nature of these bonds, the pre-oxidized samples with relevant number of C=O groups showed an increase in the degree of functionalization with the HBPEIs. Furthermore, both the acid-base properties and the coordination capacity for metal ions of the hybrids are equivalent to that of the free HBPEIs in solution. This means that the chemical characteristics of the HBPEIs have been efficiently transferred to the hybrids. To reach this conclusion we have developed a novel procedure to assess the acid-base and the coordination properties of the hybrids (solids) by means of potentiometric titration. The good agreement of the values obtained for the hybrids and for the free HBPEIs in aqueous solution supports the reliability of the procedure. Moreover, the high capacity of the hybrids to capture Ni2+ by complexation opens new possibilities of using these hybrids to capture high-value metal ions such as Pd2+ and Pt2+.

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“…This could find applications in both decontamination of waste waters and in the extraction of precious metals. Indeed, it was recently reported that activated carbon functionalized with randomly structured poly(ethylene imine) dendrimers are efficient scavenger of Pd 2+ cations [ 39 ]. Moreover, L2 is also a promising candidate for catalytic purposes.…”

Section: Discussionmentioning

confidence: 99%

Cation, Anion and Ion-Pair Complexes with a G-3 Poly(ethylene imine) Dendrimer in Aqueous Solution

Savastano¹,

Bazzicalupi²,

Giorgi³

et al. 2017

Molecules

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The G-3 poly(ethylene imine) ligand L2 shows a multifaceted coordination ability, being able to bind metal cations, anions and ion-pairs. The equilibrium constants for the formation of metal (Cu2+, Zn2+), anion (SO42−) and ion-pair (Cu2+/SO42−) complexes were determined in 0.1 M Me4NCl aqueous solution at 298.1 ± 0.1 K by means of potentiometric titrations. Thanks to its dendrimeric nature, L2 can form highly nucleated metal complexes, such as Cu5L210+ and Zn4L28+, in successive and well-defined complexation steps. Protonated forms of L2 give rise to relatively weak anion complexes with SO42−, but the addition of Cu2+ significantly enhances the binding ability of the ligand toward this anion below pH 9. In more alkaline solutions, an opposite trend is observed. The coordination properties of L2 are discussed with the support of modelling calculations. According to results, L2 is a promising molecule for the preparation of solid supported materials for the recovery of cations and anions from aqueous media and/or for applications in heterogeneous catalysis.

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Preparation of a poly-alkylamine surface-functionalized carbon with excellent performance as a Pd(II) scavenger

Cited by 16 publications

References 8 publications

Preparation and characterization of trihydroxamic acid functionalized carbon materials for the removal of Cu(II) ions from aqueous solution

Preparation and characterization of trihydroxamic acid functionalized carbon materials for the removal of Cu(II) ions from aqueous solution

Grafting the surface of carbon nanotubes and carbon black with the chemical properties of hyperbranched polyamines

Cation, Anion and Ion-Pair Complexes with a G-3 Poly(ethylene imine) Dendrimer in Aqueous Solution

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