Design of functionalization and structural analysis of organically-modified siliceous oxides with periodic structures for the development of sorbents for hazardous substances

Yoshitake, Hideaki

doi:10.1039/b927567c

Cited by 74 publications

(50 citation statements)

References 164 publications

(147 reference statements)

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“…Adsorption is one of the most frequently used techniques [2,3], with a great number of materials being tested as adsorbents. The materials that have been studied so far include: natural or synthetic solids [4,5], clays or mixed hydroxides [6,7], metal oxides [8], natural organic matter [9], bioadsorbents (bacterium, algae and fungi) [10], advanced material such as functional polymers, organic/inorganic hybrid structures [11][12][13], etc. Among them, organic/inorganic hybrid materials based on ordered mesoporous silicas (OMS) are more useful than other materials since they exhibit high specific surface areas and narrow pore size distributions [14,15].…”

Section: Introductionmentioning

confidence: 99%

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

et al. 2015

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Aminopropyl-functionalized mesoporous silica spherical particles were obtained through post-synthetic route. The suitability of this material as an adsorbent for heavy metals from aqueous media was tested by Cr(VI) adsorption experiments performed at various pH conditions, chromium concentrations and time. The synthesized particles were characterized before and after functionalization by X-ray diffraction at low angles, nitrogen adsorptiondesorption isotherms, infrared Fourier transform spectroscopy, scanning electron microscopy and thermogravimetric analysis. It was found that Cr(VI) adsorption occurs more efficiently in the pH range between 2 and 3. As a consequence of the nanometer scale of the particles, concentration profiles do not develop inside of them and thus there are no diffusional restrictions within the pores, leading to a higher Cr(VI) adsorption than that previously reported for similar systems. Chromium desorption for material reutilization was carried out in basic media. Results showed that the amino groups were grafted successfully without mesostructure damage. These groups are essential for the metal ion removal and no significant leaching was observed after four use/regeneration/use cycles. The batch equilibrium data fitted well the Langmuir isotherm with a maximum adsorption capacity of 87.1 mg g -1 at 25°C. A discussion about the relationship between structure and its behavior as adsorbent, including regeneration and reusability, is given.

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Section: Introductionmentioning

confidence: 99%

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

et al. 2015

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“…Their fascinating characteristics of large surface area, highly uniform pore distribution, well-defined pore structure, large adsorption capacity and wide possibilities of functionalization have enabled themselves to be an attractive family of material [14]. Varieties of mesoporous silica with specific binding sites have been prepared by the introduction of distinct organo-functional groups to the pore surface [15,16]. Among them, amino-functionalized mesoporous silica, owing to their great chelating ability of amino groups and charged surface characteristics, have been proven to be one of the most useful sorbents for sequestering pollutants from aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cu(II)–EDTA chelates on tri-ammonium-functionalized mesoporous silica from aqueous solution

Wang

Lan

et al. 2013

Separation and Purification Technology

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a b s t r a c tThe preparation and application of tri-ammonium-functionalized mesoporous silica SBA-15 (NNN-SBA-15) for sequestering Cu(II)-EDTA chelates from aqueous solution with low concentration of 0.1 mmol/L were explored. The adsorption properties of copper in the presence of equimolar EDTA were examined as a function of initial pH, ionic strength, initial concentration and temperature. Results revealed that the adsorption of Cu(II)-EDTA chelates on NNN-SBA-15 achieved equilibrium within 2 min and fitted well with the Langmuir model. The maximum copper adsorption capacity was estimated to be 26.3 mg/g. High ionic strength (0.1 mol/L of NaNO 3 ) influenced the removal of Cu(II)-EDTA chelates, while temperature (from 15 to 35°C) had slight effect on the adsorption capacity. Compared with the copper sorption system without EDTA species, the capture ability of copper increased significantly with coexistence of EDTA species in acidic condition. XPS spectrum studies indicated that Cu(II)-EDTA was removed from aqueous solution by the electrostatic interaction and hydrogen bond interaction between the protonated amine groups of NNN-SBA-15 and Cu(II)-EDTA chelates.

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“…The MVS approach allowed to deposit very small copper nanoparticles (<5 nm) at room temperature directly in its reduced form, so that, calcination and activation processes, which can eventually modify the structure of hybrid organic/inorganic support, were avoided. The choice of amino-functionalized silica was dictated by the ability of primary alkyl amines to stabilize Cu nanoparticles [43], and the strong tendency of amino-functionalized silica to bind copper species [44][45][46][47][48].…”

Section: Preparation and Characterization Of Cu Nanoparticles Supportmentioning

confidence: 99%

Aminopropyl-silica-supported Cu nanoparticles: An efficient catalyst for continuous-flow Huisgen azide-alkyne cycloaddition (CuAAC)

Jumde

Evangelisti

Mandoli

et al. 2015

Journal of Catalysis

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Cu nanoparticles prepared by metal vapor synthesis (MVS) were immobilized on 3-aminopropyl-functionalized silica at room temperature. HRTEM analysis of the catalyst showed that the copper nanoparticles are present with mean diameters limited in the range 1.0-4.5 nm. TPR analysis was performed in order to study the oxidation state of the supported copper nanoparticles. The supported catalyst was used both in batch and in a packed-bed reactor for continuous-flow CuAAC reaction. The activation of the copper catalyst by reduction using phenyl hydrazine in continuous-flow conditions was demonstrated. Along with the high catalytic activity (productivity up to 1689 mol/mol), the catalyst can be used several times with negligible Cu leaching in the product (<9 ppm), less than allowed Cu contaminant in pharmaceuticals. The applicability of packed-bed flow reactor was showed by sequentially converting different substrates in their corresponding products using same column

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Design of functionalization and structural analysis of organically-modified siliceous oxides with periodic structures for the development of sorbents for hazardous substances

Cited by 74 publications

References 164 publications

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

Adsorption of Cu(II)–EDTA chelates on tri-ammonium-functionalized mesoporous silica from aqueous solution

Aminopropyl-silica-supported Cu nanoparticles: An efficient catalyst for continuous-flow Huisgen azide-alkyne cycloaddition (CuAAC)

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