The key to control Cu II loading in silica based mesoporous materials

Brodie–Linder, Nancy; Besse, Régis; Audonnet, Fabrice; Caër, Sophie Le; Deschamps, Johnny; Impéror‐Clerc, Marianne; Alba‐Simionesco, Christiane

doi:10.1016/j.micromeso.2010.04.001

Cited by 29 publications

(22 citation statements)

References 41 publications

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“…Copper(II) was immobilized on the materials using the method developed by Brodie-Linder et al 29 The materials were tested as catalysts for this reaction, with no addition of reducing agents or further ligands. It is worth noting that both reactants are not miscible in water.…”

Section: Resultsmentioning

confidence: 99%

Direct Synthesis of Mesoporous Organosilica and Proof-of-Concept Applications in Lysozyme Adsorption and Supported Catalysis

et al. 2020

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Mesoporous materials represent a useful alternative for exploiting the effects of confinement on molecular trapping and catalysis. Their efficiency often depends on the interactions between the surface and the targeted molecules. One way to enhance these interactions is to adjust the hydrophobic/hydrophilic balance of the surface. In the case of mesoporous silica, the incorporation of organic groups is an efficient solution to adapt the material for specific applications. In this work, we have used the co-condensation method to control the hydrophobicity of mesoporous organosilica. The obtained materials are methyl- or phenyl-containing silica with a pore size between 3 and 5 nm. The surface chemistry control has shown the enhanced performance of the materials in two proof-of-concept (PoC) applications: lysozyme adsorption and supported catalysis. The lysozyme adsorption is observed to be over 3 times more efficient with the phenyl-functionalized material than MCM-41, due to π–π interactions. For the catalysis, copper(II) was immobilized on the organosilica surface. In this case, the presence of methyl groups significantly enhanced the product yield for the catalyzed synthesis of a triazole derivative; this was attributed to the enhanced hydrophobic surface–reactant interactions. It was also found that the materials have a higher water adsorption capacity and an improved resistance to hydrolysis. The modulation of water properties in confinement with hydrophobic surfaces, consistently with the water as tuneable solvent (WaTuSo) concept, is a crucial aspect in the efficiency of mesoporous materials for dedicated applications.

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Section: Resultsmentioning

confidence: 99%

Direct Synthesis of Mesoporous Organosilica and Proof-of-Concept Applications in Lysozyme Adsorption and Supported Catalysis

et al. 2020

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“…The photocatalytic effectiveness of studied materials is demonstrated by the UV-visible diffuse reflectance spectroscopy data. The results show that the optical bandgap E(eV) calculated by means of the Kubelka-Munk equation for a direct transition in CuO crystals (see [10][11][12]) is equal to 1.25±0.05 eV for the CuO||SiO 2 materials, whereas for commercial CuO it is around 1.50±0.05 eV [13]. The absence of the Cu 2 O phase in the layers was additionally confirmed by the voltammetry method [14] using the discussed copper(II) oxide layer deposited on the surface of Ni-foil electrode.…”

Section: Kinetics Of Cuo Layers Growthmentioning

confidence: 91%

Synthesis and comparative photocatalytic activity of CuO layers on SiO2 substrates

Polyakov¹,

Tzukanov²,

Volkov³

et al. 2020

Nanosystems: Phys. Chem. Math.

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Using the thermodynamic and kinetic approaches, it was found that Cu(NH 3) 2+ 4 aq complex predominating at 23 • C spontaneously decomposes at elevated temperatures, forming CuO precipitate in a bulk solution and a layer (CuO||SiO 2) on the surface of silica glass. The rates of these heterogeneous processes are fairly well described by the 1st-order reaction of decay of the Cu(NH 3) 2+ 4 aq complex. The formation of the CuO precipitate and layer is a two-step kinetic process. The rate of precipitate formation dominates above 65 • C while the rate of the layer formation prevails below this value. The CuO||SiO 2 material synthesized below 65 • possesses an optical bandgap of (1.25±0.05) eV, which is smaller compared to the crystals of commercial CuO. The CuO||SiO 2 material displays a photocatalytic activity in the reaction of UV-decomposition of benzoquinone-hydroquinone. It was discovered that the photocatalytic activity depends on the thickness of the photocatalyst layer.

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“…Organic Mesoporous Silica (OMS) such as SBAs, MCMs or KIT-6 have attracted attention of researchers since their particularly high specific surface areas and porous volumes make them ideal for the incorporation of different species, including metal oxides [12][13][14] and especially copper oxide [15][16][17][18][19][20][21][22][23]. The pore size of SBA-15 that lies in the range of 5-10 nm is expected to enable a good diffusion of gaseous species through the mesoporous network.…”

Section: ) Xmentioning

confidence: 99%

CuO/SBA-15 materials synthesized by solid state grinding: Influence of CuO dispersion and multicycle operation on DeSO performances

Gaudin

Dorge

Nouali

et al. 2016

Applied Catalysis B: Environmental

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The key to control Cu II loading in silica based mesoporous materials

Cited by 29 publications

References 41 publications

Direct Synthesis of Mesoporous Organosilica and Proof-of-Concept Applications in Lysozyme Adsorption and Supported Catalysis

Direct Synthesis of Mesoporous Organosilica and Proof-of-Concept Applications in Lysozyme Adsorption and Supported Catalysis

Synthesis and comparative photocatalytic activity of CuO layers on SiO2 substrates

CuO/SBA-15 materials synthesized by solid state grinding: Influence of CuO dispersion and multicycle operation on DeSO performances

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