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

Godino-Salido, M. Luz; Santiago-Medina, Antonio; López‐Garzón, Rafael; Valero, M. Dolores Gutiérrez; Arranz‐Mascarós, Paloma; Torre, Maria Dolores López de la; Domingo-Garcı́a, M.; López-Garzón, F.J.

doi:10.1016/j.apsusc.2016.06.065

Cited by 12 publications

(13 citation statements)

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“…In the studied pH range, H 3 L behaves as an heptaprotic molecule. In agreement with the behavior of analogous polyamines functionalized with the same pyrimidine derivative [27][28][29][30][31][32][33][34][35][36], the secondary amines directly connected to the pyrimidine residues can be deprotonated at pH ≈ 11, while the pyrimidine nitroso groups are protonated below pH 2.5. These protonation equilibria are generally easily followed through UV-Vis measurements, as they significantly alter π-π* transitions of the chromophore.…”

Section: Ligand Protonation Equilibriasupporting

confidence: 73%

“…The approach is generally valid and it has found application for other catalytic processes, like the Cu-free Sonogashira cross-coupling [27,28]. Moreover, should the field shift towards non-noble metals, the macrocyclic portion of the ligand is changeable to suit the stereoelectronic preferences of different metal ions [31][32][33]. Should metal-free catalyst instead become popular, this approach can be, and has been, used to graft organic molecules on graphitic surfaces (e.g., for pH-controlled recovery of metal ions and their cyano complexes) [29,31,34,35], thus offering a convenient functionalization method.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Walled Carbon Nanotubes Supported Pd(II) Complexes: A Supramolecular Approach towards Single-Ion Oxygen Reduction Reaction Catalysts

et al. 2020

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Lowering the platinum group metal content of oxygen reduction reaction catalysts is among the most prevalent research focuses in the field. This target is herein approached through supported Pd(II) complexes. Starting from a commercial macrocycle, a new ligand is synthesized, its solution behavior and binding properties briefly explored (potentiometry, UV-Vis) and then used to prepare a new catalyst. A supramolecular approach is used in order to obtain homogeneous decoration of carbon nanotubes surfaces, fostering novel possibilities to access single-ion active sites. The novel catalyst is characterized through X-ray photoelectron spectroscopy and scanning transmission electron microscopy and its promising oxygen reduction reaction performance is evaluated via rotating ring-disk electrode and rotating disk electrode in half-cell studies.

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Section: Ligand Protonation Equilibriasupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Multi-Walled Carbon Nanotubes Supported Pd(II) Complexes: A Supramolecular Approach towards Single-Ion Oxygen Reduction Reaction Catalysts

et al. 2020

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“…transform infrared (FTIR) results revealed that the Ca 2+ ions in this Ca-MOF are capable of being exchanged by Cu 2+ almost quantitatively in seconds in aqueous solution. This MOF showed a maximum Cu 2+ sorption capacity of ≈68 mg g −1 at pH = 7, which is higher than those of activated carbons, [60] natural zeolite, [61] and several organic resins [62] (13-60 mg g −1 ). The second-order rate constant k 2 of Ca-MOF is as high as 0.032 g mg −1 min −1 , obtained by exchange kinetics experiment.…”

Section: Capture Of Metal Ions and Other Moleculesmentioning

confidence: 99%

Calcium‐Based Metal–Organic Frameworks and Their Potential Applications

Xian

Lin

Wang

et al. 2020

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Metal-organic frameworks (MOFs) built on calcium metal (Ca-MOFs) represent a unique subclass of MOFs featuring high stability, low toxicity, and relatively low density. Ca-MOFs show considerable potential for molecular separations, electronic, magnetic, and biomedical applications, although they are not investigated as extensively as transition metal-based MOFs. Compared to MOFs made of other groups of metals, Ca-MOFs may be particularly advantageous for certain applications such as adsorption and storage of light molecules because of their gravimetric benefit, and drug delivery due to their high biocompatibility. This review intends to provide an overview on the recent development of Ca-MOFs, including their synthesis, crystal structures, important properties, and related applications. Various synthetic methods and techniques, types of building blocks, structure and porosity features, selected physical properties, and potential uses will be discussed and summarized. Representative examples will be illustrated for each type of important applications with a focus on their structure-property relations.ethylene/acetylene, propane/propylene) through highly selective size exclusion mechanism, [6,11,24] which has not been achieved by conventional adsorbent materials. The potential uses of MOFs depend on their pore structure (pore size/pore shape), surface functionality, as well as the type of metal centers and ligands.Calcium-based metal-organic frameworks (Ca-MOFs) represent a subgroup of MOFs with calcium as metal centers. Unlike MOFs built on transition and post-transition metals (Zr, Fe, Co, Ni, Cu, Zn, etc.) which tend to form commonly observed SBUs and topology and, therefore allow for successful design and implementation of targeted structure and functionality, the prediction of coordination geometry and structural topology of Ca-MOFs are much more challenging. This could be attributed to the fact that the bonding interactions between calcium and organic ligands (commonly carboxylates or phosphates) are more ionic, and thus the coordination mode of calcium and the topology of Ca-MOFs largely rely on the nature of the organic ligands as well as the synthetic conditions. However, Ca-MOFs possess several advantages compared to those built on transition metals: 1) Ca-MOFs generally feature high thermal stability because of its high electropositivity which leads to strong, ioniclike bonds with organic ligands (e.g., carboxylates). 2) Calcium is earth-abundant (3.4% of Earth's crust) and nontoxic, making Ca-MOFs relatively inexpensive and environmentally safe, thus especially promising for biological related applications. 3) The lightweight of calcium metal offers gravimetric benefit for gas adsorption/storage related applications.To date, more than 150 Ca-MOFs have been reported (Table 1). These MOFs bear different structural features and have been evaluated for various applications, including molecular separation, drug delivery and controlled release, chemical sensing, and proton conductivity, to name a few. In this...

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“…In this respect, some of us have recently shown that the 6-amino-3,4-dihydro-3-methyl-5-nitroso-4-oxopyrimidine group can be profitably exploited for the non-covalent functionalization of carbon materials thanks to its ability to π-π stack irreversibly with arene centers [10]. Following this strategy, different ligands, herewith represented as Ar-S-F (Figure 1), were appended on activated carbon (AC) [11,12,13,14,15,16,17,18] and on multi-walled carbon nanotubes (MWCNT) [19,20,21] to obtain hybrid materials that were employed for the recovery of both metal cations [12,13,14,15,16,21] and anions [17,18] from aqueous media and for the preparation of Pd-catalysts with high efficiency towards oxygen reduction reactions in alkaline media [19], Cu-free Sonogashira cross coupling reactions [20] and hydrogenation processes [11].…”

Section: Introductionmentioning

confidence: 99%

A New Heterogeneous Catalyst Obtained via Supramolecular Decoration of Graphene with a Pd2+ Azamacrocyclic Complex

et al. 2019

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A new G-(H2L)-Pd heterogeneous catalyst has been prepared via a self-assembly process consisting in the spontaneous adsorption, in water at room temperature, of a macrocyclic H2L ligand on graphene (G) (G + H2L = G-(H2L)), followed by decoration of the macrocycle with Pd2+ ions (G-(H2L) + Pd2+ = G-(H2L)-Pd) under the same mild conditions. This supramolecular approach is a sustainable (green) procedure that preserves the special characteristics of graphene and furnishes an efficient catalyst for the Cu-free Sonogashira cross coupling reaction between iodobenzene and phenylacetylene. Indeed, G-(H2L)-Pd shows an excellent conversion (90%) of reactants into diphenylacetylene under mild conditions (50 °C, water, aerobic atmosphere, 14 h). The catalyst proved to be reusable for at least four cycles, although decreasing yields down to 50% were observed.

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

Cited by 12 publications

References 65 publications

Multi-Walled Carbon Nanotubes Supported Pd(II) Complexes: A Supramolecular Approach towards Single-Ion Oxygen Reduction Reaction Catalysts

Multi-Walled Carbon Nanotubes Supported Pd(II) Complexes: A Supramolecular Approach towards Single-Ion Oxygen Reduction Reaction Catalysts

Calcium‐Based Metal–Organic Frameworks and Their Potential Applications

A New Heterogeneous Catalyst Obtained via Supramolecular Decoration of Graphene with a Pd2+ Azamacrocyclic Complex

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