Eco-friendly functionalization of magnetic halloysite nanotube with SO3H for synthesis of dihydropyrimidinones

Maleki, Ali; Hajizadeh, Zoleikha; Firouzi-Haji, Razieh

doi:10.1016/j.micromeso.2017.09.034

Cited by 166 publications

(62 citation statements)

References 38 publications

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“…To demonstrate benefit of this work, our catalyst was compared with that used in other published methods . Some results for the reduction of MO and MB are summarized in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Separation of nanoparticles from the reaction medium using simple methods such as filtration and centrifugation is difficult . To overcome these difficulties, different solid supports such as TiO 2 , graphene, mesoporous materials, and Fe 3 O 4 were applied for the immobilization of metal nanoparticles and the construction of the heterogeneous nanocatalyst . Graphene oxide (GO) has been identified as a new group of interesting catalysts because of their unique properties such as good stability, large surface area, high mechanical strength, and good adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

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Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe₃O₄/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

Esmaili

Mohammadi

Abbaszadeh

et al. 2020

Applied Organom Chemis

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The magnetically recyclable graphene oxide‐Fe3O4/polyallylamine (PAA)/Ag nanocatalyst was prepared via a green route using Eucalyptus comadulensis leaves extract as both reducing and stabilizing agent. The catalytic activity of this nanocatalyst was investigated for the reduction reaction of methylene blue and methyl orange in the presence of NaBH4 in aqueous medium at room temperature. The prepared nanocatalyst was characterized by different methods such as Fourier transformed infrared spectroscopy, X‐ray diffraction, scanning electron microscopy–energy dispersive X–ray spectroscopy, thermogravimetric analysis, vibrating sample magnetometer, transmission electron microscopy, and UV–visible spectroscopy. The results show that graphene oxide/PAA/Ag nanocatalyst has good activity and recyclability, and can be reused several times without major loss of activity in the reduction process. The apparent rate constants of the methyl orange (MO) and methylene blue (MB) were calculated to be 0.077 s−1 (3 mg of catalyst) and 0.15 s−1 (2 mg of catalyst), respectively.

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“…To demonstrate benefit of this work, our catalyst was compared with that used in other published methods . Some results for the reduction of MO and MB are summarized in Table .…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe₃O₄/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

Esmaili

Mohammadi

Abbaszadeh

et al. 2020

Applied Organom Chemis

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“…Use of clays as supports for immobilization of the catalytic species and development of heterogeneous catalyst is well established . In this line, the utility of naturally occurring biocompatible halloysite nanoclay, Hal, that is a dioctahedral 1:1 layered aluminosilicate [Al 2 Si 2 O 5 (OH) 4 · n H 2 O] has attracted growing attention, and recently many Hal‐based heterogeneous (photo) catalysts with outstanding catalytic performances have been reported . It is worth noting that apart from individual Hal, various Hal‐based hybrid systems have also been designed and applied for catalytic purposes .…”

Section: Introductionmentioning

confidence: 99%

Palladated halloysite hybridized with photo‐polymerized hydrogel in the presence of cyclodextrin: An efficient catalytic system benefiting from nanoreactor concept

Sadjadi

Atai

2019

Applied Organom Chemis

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Considering the excellent performance of halloysite as a catalyst support and in an attempt to benefit from the concept of nanoreactors in the catalysis, an innovative catalytic system has been designed, in which acrylamide and bis‐acrylamide were photo‐polymerized in the presence of palladated halloysite. The novel precipitation photo‐polymerization method avoided the formation of an extended polymeric network, but led to the formation of co‐polymer on the halloysite periphery. The co‐polymer exhibited good swellability in aqueous media and formed hydrogel. This hydrophilic environment around catalytic palladated halloysite can be considered as a nanoreactor that can concentrate the substrate and bring them into the vicinity of the palladated halloysite. This catalytic system was used for promoting hydrogenation of hydrophobic nitro arenes in aqueous media. To avoid immiscibility of hydrophobic substrates and hydrophilic nature of the nanoreactor, that emerged from swelling of hydrogel, β‐cyclodextrin (CD) was utilized as phase transfer agent. The results confirmed high catalytic activity of this catalytic system. Even highly hydrophobic substrates could tolerate hydrogenation under this protocol to furnish the corresponding product in high yield. Finally, the contribution of both CD and hydrogel to the catalysis was confirmed. Moreover, studying the recyclability of the catalyst as well as Pd leaching proved the high recyclability of the catalyst and low leaching of Pd nanoparticles.

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“…The core/shell Fe 3 O 4 nanoparticles can be recycled from the medium of reaction by external magnetic field (13,14). The surface of MNPs can be functionalized simply through suitable surface modifications to provide the attachment of a variety of favorable functionalities (15)(16)(17)(18)(19)(20)(21)(22)(23)(24). Therefor the modified magnetic nanoparticles with all these features are used for varied organic reactions under ultrasonic irradiations (25,26).…”

Section: Introductionmentioning

confidence: 99%

Sonochemical synthesis of chromenes catalyzed by L-phenyl alanine-attached nano-Fe₃O₄@SiO₂

Safaei‐Ghomi

Eshteghal

Shahbazi‐Alavi

2018

Green Chemistry Letters and Reviews

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An efficient multi-component synthesis of 10,10-dimethyl-7-(phenyl)-10,11-dihydrochromeno[4,3-b]chromene-6,8(7H,9H )-diones is described by a one-pot condensation reaction of aldehydes, dimedone and 4-hydroxycoumarin using L-phenyl alanine tethered to nano-Fe 3 O 4 @SiO 2 under ultrasonic irradiation. The catalyst has been characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDX), thermal gravimetric analysis (TGA) and vibratingsample magnetometer (VSM). Atom economy, wide range of products, high catalytic activity, excellent yields in short reaction times, reusability of the catalyst and low catalyst loading are some of the important features of this protocol. ARTICLE HISTORY

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Eco-friendly functionalization of magnetic halloysite nanotube with SO3H for synthesis of dihydropyrimidinones

Cited by 166 publications

References 38 publications

Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe₃O₄/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe₃O₄/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

Palladated halloysite hybridized with photo‐polymerized hydrogel in the presence of cyclodextrin: An efficient catalytic system benefiting from nanoreactor concept

Sonochemical synthesis of chromenes catalyzed by L-phenyl alanine-attached nano-Fe₃O₄@SiO₂

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Eco-friendly functionalization of magnetic halloysite nanotube with SO3H for synthesis of dihydropyrimidinones

Cited by 166 publications

References 38 publications

Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe3O4/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe3O4/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

Palladated halloysite hybridized with photo‐polymerized hydrogel in the presence of cyclodextrin: An efficient catalytic system benefiting from nanoreactor concept

Sonochemical synthesis of chromenes catalyzed by L-phenyl alanine-attached nano-Fe3O4@SiO2

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Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe₃O₄/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe₃O₄/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

Sonochemical synthesis of chromenes catalyzed by L-phenyl alanine-attached nano-Fe₃O₄@SiO₂