Development of Amine Functionalized Wrinkled Silica Nanospheres and Their Application as Efficient and Recyclable Solid Base Catalyst

Shabir, Javaid; Garkoti, Charu; Surabhi, .; Sah, Digvijay; Mozumdar, Subho

doi:10.1007/s10562-017-2235-x

Cited by 19 publications

(10 citation statements)

References 52 publications

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“…The first weight loss below 200°C was assigned to the loss of the physically adsorbed water of the SBA‐15 support. The second range of weight loss at 200°C‐550°C was due to the decomposition of the grafted organic silane species . The weight loss for all of the samples ranging from 200°C‐550°C decreased in the following order: Au‐Pd‐SBA‐15‐NH 2 ‐TD (18.51%) > Au‐Pd‐SBA‐15‐NH 2 ‐D (17.55%) ≥ Au‐Pd‐SBA‐15‐NH 2 ‐T (17.53%).…”

Section: Resultsmentioning

confidence: 96%

“…The second range of weight loss at 200 C-550 C was due to the decomposition of the grafted organic silane species. [53][54][55] The weight loss for all of the samples ranging from 200 C-550 C decreased in the following order: Au-Pd-SBA-15-NH 2 -TD (18.51%) > Au-Pd-SBA-15-NH 2 -D (17.55%) ≥ Au-Pd-SBA-15-NH 2 -T (17.53%). This indicates that the Au-Pd-SBA-15-NH 2 -TD possessed the highest content of amine groups.…”

Section: Tga-dsc Analysismentioning

confidence: 99%

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AuPd bimetal immobilized on amine‐functionalized SBA‐15 for hydrogen generation from formic acid: The effect of the ratio of toluene to DMF

et al. 2019

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The volume ratio of toluene to N,N‐dimethylformamide (DMF) was adjusted during the amine functionalization of SBA‐15 to change the amine content of SBA‐15. XPS, FTIR, and TGA analyses indicated that under the experimental synthetic conditions the number of amine groups varies with the ratio of toluene/DMF, and the highest content of amine could be obtained with a volume ratio of toluene/DMF = 3:2. The hydrogen production experiment of formic acid decomposition showed that the hydrogen production efficiency over the Au‐Pd‐SBA‐15‐NH2 catalysts increased with the increase in the surface amine content of the Au‐Pd‐SBA‐15‐NH2. The optimal Au‐Pd‐SBA‐15‐NH2‐TD (toluene/DMF = 3:2) catalyst proved to have the smallest Au‐Pd bimetal nanoparticle size and exhibited a turnover frequency (TOF) = 631 hours−1 and an activation energy (Ea) = 20.8 kJ · mol−1 at 25°C. The catalytic performance of hydrogen generation from the formic acid was improved due to the synergistic effect between the amine‐functionalized SBA‐15 and the Au‐Pd bimetal (metal‐support interactions).

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Section: Resultsmentioning

confidence: 96%

Section: Tga-dsc Analysismentioning

confidence: 99%

AuPd bimetal immobilized on amine‐functionalized SBA‐15 for hydrogen generation from formic acid: The effect of the ratio of toluene to DMF

et al. 2019

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“…The characteristic peaks occurring at 2θ of 18.321, 30.361, 35.764, 43.472, 53.475, 57.511, and 63.165° correspond to the crystal faces of Fe 3 O 4 (JCPDS NO.19‐0629), (111), (220), (311), (400), (422), (511) and (440) . The broad peaks occurring at 2θ ranging from 20 to 28° are the characteristic diffraction peaks of amorphous SiO 2 , indicating that SiO 2 is successfully encapsulated onto the surface of Fe 3 O 4 .…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1C presents the XRD diffraction of SiO 2 -β-CD@Fe 3 [18]. The broad peaks occurring at 2θ ranging from 20 to 28 • are the characteristic diffraction peaks of amorphous SiO 2 [19], indicating that SiO 2 is successfully encapsulated onto the surface of Fe 3 O 4 . Figure 1D presents decreased.…”

Section: Sample Pretreatmentmentioning

confidence: 99%

Preparation and application of a magnetic plasticizer as a molecularly imprinted polymer adsorbing material for the determination of phthalic acid esters in aqueous samples

Wei

Liu

Huang

et al. 2018

J of Separation Science

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A novel magnetic plasticizer molecularly imprinted polymer adsorbing material (MIP@mSiO -β-CD@Fe O ) was successfully synthesized for the determination of six phthalic acid esters in water, milk, and wine samples. The molecularly imprinted polymers were prepared via precipitation polymerization and a surface molecular imprinting technique, using a cyclodextrin-modified magnetic meso-porous material (mSiO -β-CD@Fe O ) as a magnetic supporter, dibutyl phthalate and butyl benzyl phthalate as the dual template molecules, methacrylic acid as the functional monomer, and ethyleneglycol dimethacrylate as the cross-linking agent. The polymers were characterized by scanning electron microscopy, IR spectroscopy, and X-ray powder diffraction. Thermogravimetric analysis and static and dynamic adsorption experiments were carried out to assay its stability and selectivity. Under optimal experimental conditions, a magnetic solid-phase extraction with MIP@mSiO -β-CD@Fe O coupled to gas chromatography and mass spectrometry method was successfully developed for the determination of phthalic acid esters. The established method achieved a good linear range of 0.10∼8.00 μg/mL (R > 0.99) and a low detection limit within the range of 1.0∼5.0 μg/L. An average recovery rate of 80.2∼103% with relative standard deviation < 6.7% was obtained upon the application of the developed method to detect phthalic acid esters in actual aqueous samples.

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“…Continuing in this direction and addressing some of the major drawbacks related to the use of ionic liquids as homogeneous catalysts; the synthesis and characterization of magnetic graphene oxide supported ILs (MGO‐IL‐NH 2 ) along with its application in a one‐pot three‐component reaction for the synthesis of 3‐amino alkylated indoles (via Mannich reaction) is being reported. This prepared heterogenized IL is claimed to exhibit remarkable advantages when compared with other reported catalysts (such as giving the excellent yield of the desired products within lesser reaction time).…”

Section: Introductionmentioning

confidence: 99%

Amine‐Terminated Ionic Liquid Modified Magnetic Graphene Oxide (MGO‐IL‐NH₂): A Highly Efficient and Reusable Nanocatalyst for the Synthesis of 3‐Amino Alkylated Indoles

2020

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Amine‐terminated ionic liquid has been covalently fabricated over the surface of Magnetic graphene oxide nanosheets. The structure of prepared material has been confirmed by various characterization techniques such as Fourier Transform Infrared Spectroscopy (FT‐IR), Powder XRD, Vibrating Sample Magnetometer (VSM), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Energy Dispersive X‐ray spectroscopy (EDX). The prepared material demonstrates its supremacy as an efficient, recyclable and cost‐effective heterogeneous catalyst in the synthesis of 3‐amino alkylated indoles via Mannich reaction. The presence of both the hydrogen‐bond donors and acceptors assemblies helps to activate the substrate molecule, thereby increases the rate of reaction and excellent product yields have been obtained. Moreover, the catalyst could be magnetically recovered and recyclable up to seven consecutive cycles thereby make the protocol efficient for large‐scale production of pharmaceutically important compounds.

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Development of Amine Functionalized Wrinkled Silica Nanospheres and Their Application as Efficient and Recyclable Solid Base Catalyst

Cited by 19 publications

References 52 publications

AuPd bimetal immobilized on amine‐functionalized SBA‐15 for hydrogen generation from formic acid: The effect of the ratio of toluene to DMF

AuPd bimetal immobilized on amine‐functionalized SBA‐15 for hydrogen generation from formic acid: The effect of the ratio of toluene to DMF

Preparation and application of a magnetic plasticizer as a molecularly imprinted polymer adsorbing material for the determination of phthalic acid esters in aqueous samples

Amine‐Terminated Ionic Liquid Modified Magnetic Graphene Oxide (MGO‐IL‐NH₂): A Highly Efficient and Reusable Nanocatalyst for the Synthesis of 3‐Amino Alkylated Indoles

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Development of Amine Functionalized Wrinkled Silica Nanospheres and Their Application as Efficient and Recyclable Solid Base Catalyst

Cited by 19 publications

References 52 publications

AuPd bimetal immobilized on amine‐functionalized SBA‐15 for hydrogen generation from formic acid: The effect of the ratio of toluene to DMF

AuPd bimetal immobilized on amine‐functionalized SBA‐15 for hydrogen generation from formic acid: The effect of the ratio of toluene to DMF

Preparation and application of a magnetic plasticizer as a molecularly imprinted polymer adsorbing material for the determination of phthalic acid esters in aqueous samples

Amine‐Terminated Ionic Liquid Modified Magnetic Graphene Oxide (MGO‐IL‐NH2): A Highly Efficient and Reusable Nanocatalyst for the Synthesis of 3‐Amino Alkylated Indoles

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Amine‐Terminated Ionic Liquid Modified Magnetic Graphene Oxide (MGO‐IL‐NH₂): A Highly Efficient and Reusable Nanocatalyst for the Synthesis of 3‐Amino Alkylated Indoles