A highly efficient magnetic solid acid nanocatalyst for the synthesis of new bulky heterocyclic compounds

Nasr‐Esfahani, Masoud; Rafiee, Zahra; Montazerozohori, Morteza; Kashi, Hassan

doi:10.1039/c6ra02749k

Cited by 18 publications

(5 citation statements)

References 82 publications

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“…This confirms the condensation between hydroxyl groups of the magnetite nanoparticles surface and the ethoxysilane molecule. These findings are in agreement with previously reported results. − …”

Section: Results and Discussionsupporting

confidence: 94%

Novel Biohybrid Polysulfone Membranes with Physically Immobilized Gramicidin for Ion-Exchange Applications

Szałata

Pande

Gumı́

2018

Ind. Eng. Chem. Res.

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The goal of this work was to design a system incorporating gramicidin (gA) into a polysulfone (Psf) membrane. The strategy involved immobilization of gA on the surface of two types of magnetite nanoparticles (MNPs) dispersed in a polymeric matrix. Membranes have been treated with surfactant Triton X100 (TRX) and surfactant/protein micelles (TRX/gA). MNP morphology was studied using transmission electron microscopy, and the chemical structure was confirmed by Fourier transform infrared analysis. Membrane morphology was observed under environmental scanning electron microscopy; water interactions were tested using static contact angle and water uptake, whereas ion transport was evaluated by means of a permeability test and current–voltage experiments. Depending on the type of nanoparticles used, immobilization led to either higher or lower membrane hydrophilicity but did not influence their morphology. Protein immobilization resulted in enhanced ion diffusion properties and membrane selectivity. This novel method of fabricating materials has a tremendous potential for use in ion-exchange applications, such as fuel cells or nanofiltration.

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Section: Results and Discussionsupporting

confidence: 94%

Novel Biohybrid Polysulfone Membranes with Physically Immobilized Gramicidin for Ion-Exchange Applications

Szałata

Pande

Gumı́

2018

Ind. Eng. Chem. Res.

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“…Figure (a, b) represent the FTIR spectra of Fe 3 O 4 / MCMB, Fe 3 O 4 /Cl–MCMB, Fe 3 O 4 /Cl–MCMB–SO 3 H, and RFe 3 O 4 /Cl–MCMB–SO 3 H. The absorption band located at approximately 610 cm −1 was attributed to the stretching vibrations of FeO . Compared with the Fe 3 O 4 /MCMB, the Fe 3 O 4 /Cl–MCMB–SO 3 H had new peaks at around 694, 1032, and 1169 cm −1 , ascribed to the stretching vibration of the CCl bond and the symmetric and asymmetric stretching vibrations of the SO bond, respectively .…”

Section: Resultsmentioning

confidence: 99%

Catalytic hydrolysis of cellulose to total reducing sugars with superior recyclable magnetic multifunctional MCMB‐based solid acid as a catalyst

Shi

Zhang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Effective cellulose hydrolysis has a huge potential for producing high value-added biomass-based platform chemicals, such as glucose, hydroxymethylfurfural, levulinic acid, and total reducing sugars (TRS). Particularly, a magnetic multifunctional solid acid catalyst (Fe 3 O 4 /Cl-MCMB-SO 3 H) was synthesized by loading the active groups on the magnetic mesocarbon microbead (MCMB) derived from the co-calcination of coal tar pitch and ferroferric oxide, which was applied as a catalyst in the conversion of cellulose into TRS. RESULTS: Given the superior properties of MCMB, a novel magnetic MCMB-based solid acid with cellulose-binding domain (-Cl group) and catalytic domain (-SO 3 H group) was successfully prepared. Results indicated that this catalyst exhibited superior catalytic activity, recyclability and regenerability, and easy separation from the reactant. The acidic densities of -SO 3 H and -Cl in Fe 3 O 4 /Cl-MCMB-SO 3 H reached 1.77 and 1.32 mmol/g, respectively. The 68.6% TRS yield can be obtained from cellulose at 140 ∘ C for 3 h in distilled water by using Fe 3 O 4 /Cl-MCMB-SO 3 H as the catalyst.The TRS yield still reached 61.1% after the catalyst was used six times. Importantly, through catalyst regeneration, the -SO 3 H density and TRS yield still reached 1.69 mmol/g and 67.3%, indicating that the catalyst exhibited excellent regenerability. CONCLUSION: Such multifunctional magnetic catalyst would be a promising catalyst in the conversion of cellulose into biofuels, which was attributed to the efficient catalytic performance, magnetism, and excellent recyclability and regenerability.

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“…[ 95 ] On the other hand, the FTIR spectrum of IOPs_NH 2 presented strong broadband of 983 cm −1 which corresponded to the SiO asymmetric stretching vibration. [ 96 ] Furthermore, the absorption band at 2916 cm −1 was attributed to CH stretching due to the hydrocarbon chains of the grafted APTES, [ 97 ] and the broad peak at 3413 cm −1 was attributed to NH 2 stretching vibration (Figure S2b, Supporting Information). [ 96,98 ] The NH 2 stretching vibration signal was overlapped with the OH stretching vibration signal, while the modification of the amine group can still be confirmed by the absorption peaks of CH and SiO.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Multiresponsive Magnetic Nanocomposite Double‐Network Hydrogels for Controlled Release Applications

Yeh

2021

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Nanocomposite double‐network hydrogels (ncDN hydrogels) have been demonstrated as promising biomaterials to present several desired properties (e.g., high mechanical strength, stimuli‐responsiveness, and local therapy) for biomedicine. Here, a new type of ncDN hydrogels featuring definable microstructures and properties as well as multistimuli responsiveness for controlled release applications is developed. Amine‐functionalized iron oxide nanoparticles (IOPs_NH2) are used as nanoparticle cross‐linkers to simultaneously connect the dual networks of gelatin (Gel) and polydextran aldehyde (PDA) through hydrogen bonding, electrostatic interactions, and dynamic imine bonds. The pH‐ and temperature‐responsive Gel/PDA/IOP_NH2 ncDN hydrogels present a fast release profile of proteins at acidic pH and high temperature. Besides, IOP_NH2 also contributes the magnetic‐responsiveness to the ncDN hydrogels, allowing the use of magnetic field to generate heat to facilitate the structural change of hydrogels and the subsequent applications. Taken together, a versatile ncDN hydrogel platform capable of multistimuli responsiveness and local heating for controlled release is developed for advanced biomedical applications.

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A highly efficient magnetic solid acid nanocatalyst for the synthesis of new bulky heterocyclic compounds

Abstract: Fe3O4 nanoparticles were coated with 3-aminopropyltriethoxysilane and further chemically modified with maleic anhydride to generate Fe3O4@APTES·MAH NPs. Then some new bulky heterocyclic compounds were synthesized using this catalyst.

Cited by 18 publications

References 82 publications

Novel Biohybrid Polysulfone Membranes with Physically Immobilized Gramicidin for Ion-Exchange Applications

Novel Biohybrid Polysulfone Membranes with Physically Immobilized Gramicidin for Ion-Exchange Applications

Catalytic hydrolysis of cellulose to total reducing sugars with superior recyclable magnetic multifunctional MCMB‐based solid acid as a catalyst

Fabrication of Multiresponsive Magnetic Nanocomposite Double‐Network Hydrogels for Controlled Release Applications

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