Chitosan templated synthesis of porous metal oxide microspheres with filamentary nanostructures

Kadib, Abdelkrim El; Molvinger, Karine; Cacciaguerra, Thomas; Bousmina, Mosto; Brunel, Daniel

doi:10.1016/j.micromeso.2010.12.012

Cited by 78 publications

(71 citation statements)

References 62 publications

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“…Beside our motivation to elucidate -for the first time -the difference on 15 the performance of support in catalysis between CS alcogels and aerogels, a second important point is to determine how CS functionalization influences the catalytic activity and if there is a borderline between efficient scavenger and efficient catalyst. To address thes issues, Sonogashira cross-coupling of aryl 20 iodide and acetylene derivatives was selected as a prototypical reaction. With some guidelines of sustainable chemistry in mind, solvents like dimethylformamide and toluene, organic bases like NEt3, harsh temperatures and the presence of copper as a second metal were all discarded.…”

Section: 16mentioning

confidence: 99%

Pd embedded in chitosan microspheres as tunable soft-materials for Sonogashira cross-coupling in water–ethanol mixture

et al. 2015

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Section: 16mentioning

confidence: 99%

Pd embedded in chitosan microspheres as tunable soft-materials for Sonogashira cross-coupling in water–ethanol mixture

et al. 2015

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“…28,29 Chitosan (obtained from chitin) next to cellulose is the second most abundant organic resource, imparted rather less expensively. 30 For instance, Kadib et al 31,32 prepared porous metal oxide microsphere using chitosan as precursor.…”

Section: ■ Introductionmentioning

confidence: 99%

Three-Dimensional Porous Spinel Ferrite as an Adsorbent for Pb(II) Removal from Aqueous Solutions

Reddy

Lee

2013

Ind. Eng. Chem. Res.

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Application of porous magnetic materials for detoxification of pollutants from aqueous solutions has attracted great attention in recent years because of their ease of separation and enhanced efficiency. In this light, a three-dimensional (3D) porous NiFe 2 O 4 adsorbent (PNA) having significant magnetic properties was synthesized and employed in detoxification of Pb(II) contaminated aqueous solution. The PNA was obtained by a sol−gel process using chitosan as precursor and was fully characterized by using FTIR, XRD, SEM, and EDAX analytical techniques. The surface morphology obtained from the SEM images of the PNA clearly exhibited the three-dimensional porous structure; pores were well interconnected. The kinetic mechanism was best described by pseudo-second-order and double-exponential models. The equilibrium state sorption data was best fitted to the Langmuir and Sips isotherm models. The studies clearly demonstrated that the PNA could be an efficient material for treatment of Pb(II) contaminated wastewaters.

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“…The mechanism for the formation of micro/mesopores with high metal oxides dispersion ( Figure 9) is consistent with all characterizations results. Similar polymer template synthesis mechanism of porous oxide was previously described with other templates [25,41,[46][47][48][49].…”

Section: Acidity From Ethanol Dehydrationmentioning

confidence: 80%

“…The use of organic precursors in the synthesis of catalysts, as gelatin, allows having some control over the metallic dispersion, morphology, and particle size and directly affects the textural, morphological, and structural properties of the final material [25,41], which are essential characteristics in the efficiency of catalytic processes. Thus, the present work shows the bioinspired synthesis and characterization of catalytic supports containing aluminum oxide and/or silicon using an alternative synthetic methodology from gelatin, which is efficient and of low cost.…”

Section: +mentioning

confidence: 99%

Gelatin Template Synthesis of Aluminum Oxide and/or Silicon Oxide Containing Micro/Mesopores Using the Proteic Sol-Gel Method

Oliveira

Paulista

Alencar

et al. 2017

Journal of Nanomaterials

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Aluminum oxide and/or silicon oxide-based supports were synthesized by proteic sol-gel method. The characterization was performed through the analysis of TG, XRD, FTIR, SEM, and N 2 physisorption. The XRD diffractograms showed an amorphous material profile. TG results indicate the total liberation of the organic and inorganic material in the calcination temperature used, occurring in different mass loss range. This piece of information was reaffirmed by the FTIR spectra, which presented characteristic bands of gelatin structure before calcinations which disappear in the spectrum of the solid after calcinations, indicating the loss of organic matter from gelatin after heat treatment. The spectra exhibited M-O stretching vibration at low wavenumbers after calcinations related to metal oxides. The acquired images by SEM suggest the obtaining of a highly porous material with very different characteristics depending on the composition of the support. The N 2 isotherms indicate the presence of a micro/mesoporous oxide with interesting textural properties, particularly for the supports containing aluminum and silicon oxide. The ethanol dehydration results showed greater selectivity to diethyl ether compared to ethylene. From the reaction data, the following order of acid strength was obtained: 2Si-Al > Si-2Al > Si-Al > Al, which is related to the Si-Al ratio.

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Chitosan templated synthesis of porous metal oxide microspheres with filamentary nanostructures

Cited by 78 publications

References 62 publications

Pd embedded in chitosan microspheres as tunable soft-materials for Sonogashira cross-coupling in water–ethanol mixture

Pd embedded in chitosan microspheres as tunable soft-materials for Sonogashira cross-coupling in water–ethanol mixture

Three-Dimensional Porous Spinel Ferrite as an Adsorbent for Pb(II) Removal from Aqueous Solutions

Gelatin Template Synthesis of Aluminum Oxide and/or Silicon Oxide Containing Micro/Mesopores Using the Proteic Sol-Gel Method

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