Adsorption of Cu2+ and Zn2+ on SBA-15 mesoporous silica functionalized with triethylenetetramine chelating agent

Lachowicz, Joanna Izabela; Delpiano, Giulia Rossella; Zanda, Davide; Piludu, Marco; Sanjust, Enrico; Monduzzi, Maura; Salis, Andrea

doi:10.1016/j.jece.2019.103205

Cited by 45 publications

(35 citation statements)

References 51 publications

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“…Indeed, the maximal adsorbed amounts, are 23.9 and 13.6 mg g −1 for copper and zinc, respectively. [21] The maximal loading of copper on SBA-TETA is comparable to 29.1 mg g −1 the value obtained by mean of potentiometric titrations (see Figure 3A; pH 4). The slight discrepancy between the two values can be attributed to a higher experimental error of ICP-OES respect to potentiometric measurements.…”

Section: Comparison Between the Potentiometric Data And The Data Obtasupporting

confidence: 63%

“…SBA-15 mesoporous silica was synthesized and functionalized with CPTMS according to the method described in the previous work. [21] Briefly, the functionalization with chloro-propyl group was carried out by dispersing 1 g of obtained SBA-15 in 25 mL of anhydrous toluene, adding 700 µL of CPTMS [21] and keeping the mixture under stirring at 110 °C overnight. The resulting SBA-Cl was collected by filtration, washed with EtO 2 and water, and dried under vacuum.…”

Section: Synthesis Of Mesoporous Materialsmentioning

confidence: 99%

“…SBA-15 mesoporous silica was synthesized and then functionalized CPTMS and with TETA to obtain SBA-Cl and SBA-TETA (Scheme 1), respectively. The physico-chemical characterizations (SAXS, TEM, FTIR, N 2 adsorption isotherms, TGA) of the obtained samples [21] are reported in Figure S1 and Table S1, Supporting Information. Analysis of all SBA-TETA samples by TEM in bright field mode revealed the typical mesoporous structure that resulted mainly characterized by the presence of ordered pore channels (Figure 1).…”

Section: Physico-chemical Characterizationsmentioning

confidence: 99%

“…[20] In recent years, it has also been tested as an experimental therapeutic molecule in diabetes, where it improves cardiac structure in patients with diabetic cardiomyopathy and left-ventricular hypertrophy. [21] TETA is known for forming stable complexes with copper and zinc ions [21] and functionalized SBA-TETA particles could be used as new effective chelators for zinc and copper ions in human organs.…”

Section: Introductionmentioning

confidence: 99%

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Improving Metal Adsorption on Triethylenetetramine (TETA) Functionalized SBA‐15 Mesoporous Silica Using Potentiometry, EPR and ssNMR

Lachowicz

Emwas

Delpiano

et al. 2020

Adv Materials Inter

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Nanomaterials are receiving high attention in the treatment and diagnosis [3] of neurological disorders where the classical pharmacological approach is not effective due to low blood brain barrier (BBB) permeability. An effective drug delivery method is combining of drugs with nanocarriers, for example, polymeric micelles, liposomes, lipid, and polymeric nanoparticles (NPs), that have high BBB affinities. [4] Metal ion chelators, which are bound covalently to nanoparticles, can facilitate drug entry into the brain. [5] Desferrioxamine (Desferal) is an iron (Fe), aluminum (Al), copper (Cu), and zinc (Zn) chelator that showed a decrease of AD progression in clinical trials, [2,6] even if the low BBB permeability of DFO is still debatable. [7] DFO conjugated to polystyrene NPs of 240 nm and examined in human cortical neurons in vitro prevented Aβ peptide aggregation, [8] the main component of the amyloid plaques found in the brains of people with Alzheimer's disease. [9] Nevertheless, low bioavailability and high toxicity restrict the use of metal chelators in humans. Functional nanoparticles are characterized by multiple incorporation of positron emitting radionuclides and signal enhancement in positron emission tomography (PET). [10] It has been Nanomaterials have received growing attention in the treatment and diagnosis of neurological disorders because the low blood brain barrier permeability hinders the classical pharmacological approach. Metal ion chelators combined with nanoparticles prove effective in the treatment of neurodegeneration and are under extensive studies. Most chelating agents and metallodrugs compete with endogenous molecules for metal coordination, and do not reach the active site. Determining the competition between metallodrugs and endogenous molecules requires knowing the stability constants of formed metal complexes. In this study, for the first time, potentiometric titrations are used to determine metal complex formation constants, and to quantify ligand content in functionalized materials. This new potentiometric approach allows physico-chemical characterization of mesoporous functionalized materials and their metal adsorption capacity in water solution. The potentiometric results are compared with isotherm models obtained by spectroscopic measurements and yield rewarding data fitting. The potentiometric method described here can be extended to different types of nanostructured materials carrying surface ionizable groups.

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Section: Comparison Between the Potentiometric Data And The Data Obtasupporting

confidence: 63%

Section: Synthesis Of Mesoporous Materialsmentioning

confidence: 99%

Section: Physico-chemical Characterizationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving Metal Adsorption on Triethylenetetramine (TETA) Functionalized SBA‐15 Mesoporous Silica Using Potentiometry, EPR and ssNMR

Lachowicz

Emwas

Delpiano

et al. 2020

Adv Materials Inter

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“…The nature of the functional groups is vital for introducing new properties to the porous organic‐inorganic hybrid materials. For instance, the different functional groups including triflic acid (TFA), sulfonic acid, triethylenetetramine, calcium alginate, 12‐tungstophosphoric acid, guanine etc. have been incorporated on materials and applied for different catalytic activities.…”

Section: Synthesis Of Organo‐functionalized Molecular Sievesmentioning

confidence: 99%

Recent Advances in the Preparation and Applications of Organo‐functionalized Porous Materials

Yadav

Baskaran

Anjali

et al. 2020

Chemistry An Asian Journal

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Organo‐functionalized materials with porous structure offer unique adsorption, catalytic and sensing properties. These unique properties make them available for various applications, including catalysis, CO2 capture and utilization, and drug delivery. The properties and the performance of these unique materials can be altered with suitable modifications on their surface. In this review, we summarize the recent advances in the preparation and applications of organo‐functionalized porous materials with different structures. Initially, a brief historical overview of functionalized porous materials is presented, and the subsequent sections discuss the recent developments and applications of various functional porous materials. In particular, the focus is given on the various methods used for the preparation of organo‐functionalized materials and their important roles in the heterogenization of homogeneous catalysts. A special emphasis is also given on the applications of these functionalized porous materials for catalysis, CO2 capture and drug delivery.

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Tuning Metal‐Support Interaction and Surface Acidic Sites of Ni/Al₂O₃ by Dopamine Modification for Glycerol Steam Reforming

et al. 2021

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In this work, a universal dopamine modification strategy is used to improve the catalytic performance of Ni/Al 2 O 3 for hydrogen production in glycerol steam reforming (GSR). Ni/Al 2 O 3 showed poor catalytic stability with rapid deactivation after 8 h of reaction in GSR. Glycerol conversion and hydrogen selectivity were significantly higher for dopamine-modified Ni/Al 2 O 3 (by 98 % and 95 %, respectively) and this improved performance was maintained well for 21 h in the stability test. The protective carbon shell derived from dopamine was formed easily on the Ni/Al 2 O 3 surface, the aggregation of Ni nanoparticles was inhibited, and the dispersion of Ni nanoparticles was improved.The electron-donating effect of amino group to Ni 2 + weakened the Ni-Al 2 O 3 interaction, and then promoted the reduction of the Ni species. In addition, the decrease in the number of strong acidic sites reduced the amount of carbon deposition on dopamine-modified Ni/Al 2 O 3 . The moderate metal-support interaction was more conducive to the formation of filamentous carbon, which collectively contributed to the increased catalytic stability of dopamine-modified Ni/Al 2 O 3 . The facile dopaminemodified method significantly improves the catalytic performance and can be generalized to other catalytic reaction that involve sintering and carbon deposition issues.

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Adsorption of Cu2+ and Zn2+ on SBA-15 mesoporous silica functionalized with triethylenetetramine chelating agent

Cited by 45 publications

References 51 publications

Improving Metal Adsorption on Triethylenetetramine (TETA) Functionalized SBA‐15 Mesoporous Silica Using Potentiometry, EPR and ssNMR

Improving Metal Adsorption on Triethylenetetramine (TETA) Functionalized SBA‐15 Mesoporous Silica Using Potentiometry, EPR and ssNMR

Recent Advances in the Preparation and Applications of Organo‐functionalized Porous Materials

Tuning Metal‐Support Interaction and Surface Acidic Sites of Ni/Al₂O₃ by Dopamine Modification for Glycerol Steam Reforming

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Adsorption of Cu2+ and Zn2+ on SBA-15 mesoporous silica functionalized with triethylenetetramine chelating agent

Cited by 45 publications

References 51 publications

Improving Metal Adsorption on Triethylenetetramine (TETA) Functionalized SBA‐15 Mesoporous Silica Using Potentiometry, EPR and ssNMR

Improving Metal Adsorption on Triethylenetetramine (TETA) Functionalized SBA‐15 Mesoporous Silica Using Potentiometry, EPR and ssNMR

Recent Advances in the Preparation and Applications of Organo‐functionalized Porous Materials

Tuning Metal‐Support Interaction and Surface Acidic Sites of Ni/Al2O3 by Dopamine Modification for Glycerol Steam Reforming

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Tuning Metal‐Support Interaction and Surface Acidic Sites of Ni/Al₂O₃ by Dopamine Modification for Glycerol Steam Reforming