Silica aerogel–iron oxide nanocomposites: recoverable catalysts for the oxidation of alcohols with hydrogen peroxide

Masoudian, Shahla; Hosseini‐Monfared, Hassan; Aghaei, Alireza

doi:10.1007/s11243-011-9498-7

Cited by 10 publications

(5 citation statements)

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“…Hydrogen peroxide is a strong oxidant with high active oxygen content, that, combined with UV light (UV/H 2 O 2 ), is a well-known advanced oxidation process for degradation of organic compounds. , The decomposition of H 2 O 2 under UV irradiation showed in the following reaction (eq ): normalH 2 normalO 2 + h ν → 2 normalO • normalH …”

Section: Results and Discussionmentioning

confidence: 99%

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling

Eskandarloo

Badiei

Behnajady

2014

Ind. Eng. Chem. Res.

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In the present work, TiO 2 /NiO coupled nanoparticles were prepared from a powder mixture of the corresponding component solid oxides by using an impregnation technique. Then, the prepared TiO 2 /NiO nanoparticles were immobilized on glass plate and used as a fixed-bed photocatalytic system for photodegradation of Acid Fuchsin (AF), as a triphenylmethane dye pollutant. The effects of nature and concentration of various additives included inorganic oxidants (such as HSO 5and BrO 3 − ), inorganic anions (such as CH 3 COO − , CO 3 2− , NO 3 − , Cl − , H 2 PO 4 − , and SO 4 2−), and transition-metal ions (such as Co 2+ , Zn 2+ , Fe 2+ , Cu 2+ , Ni 2+ , and Mn 2+ ) on photocatalytic degradation of AF, were investigated. It was found that the nature and concentration of studied additives significantly affected the photocatalytic degradation of dye pollutant in fixedbed systems. The transition-metal ions and inorganic oxidants have a positive effect on the photocatalytic degradation rate of AF dye, whereas inorganic anions have a negative effect. An artificial neural network (ANN) model was designed for modeling of the photocatalytic degradation rate of AF dye. The results showed that the predicted data from designed ANN model were in good agreement with the experimental data. Designed ANN provides a reliable method for modeling the photocatalytic activity of immobilized TiO 2 /NiO nanoparticles in the presence of various additives.

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Section: Results and Discussionmentioning

confidence: 99%

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling

Eskandarloo

Badiei

Behnajady

2014

Ind. Eng. Chem. Res.

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“…All chemicals were of highest grade and used without further treatment. Fe 2 O 3 -SiO 2 (FeSi) compound was prepared according to the reported procedure [31].…”

Section: Methodsmentioning

confidence: 99%

Selective oxidation of aromatic hydrocarbons by potassium and phosphorous-modified iron oxide–silica nanocomposite

Masoudian

Hosseini‐Monfared

2011

Transition Met Chem

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Supported iron catalysts are active for hydrocarbon oxidation with H 2 O 2 , but the hydrogen peroxide dismutation is a shortcoming that may constrain their applications. Herein, we attempted to address this problem using potassium and phosphate-doped iron oxide-silica nanocomposite (KPFeSi) synthesized via sol-gel methods. The promoted silica-iron oxide nanocomposite has been characterized by elemental analyses, FTIR, X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) surface-size determination. The synthesized KPFeSi was an active catalyst in the low-temperature liquid phase oxidation of various alkyl aromatics with hydrogen peroxide in conversions of 31-78%. Furthermore, the direct oxidation of benzene into phenol using hydrogen peroxide has been achieved in the absence of any acid with this KPFeSi compound.

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“…The surface area is less reduced in the case of the sample [IOx] 0.1 _B_40_R_1.25, which can possibly be ascribed to a more intense physical adsorption/interaction of N 2 with iron oxide phase when this is in the optimum amount.This behavior was also observed in the case of hydrophobic FeO x /SiO 2 nanocomposites, and metal-organic-frames (MOFs) having coordination polymers in the structure, or in flexible porous structures which contain pores may adjust and modify gas sorption properties by incorporation of ligand guest molecules[20,21,25]. However, this phenomenon is only observed at optimum dopant value of 0.1, while in the case of [IOx] 0.2 -B_40_R_1.25 the scenario is completely different, and S BET continues to decrease, which is attributed to the pore collapsing as a consequence of the great extent of shrinkage upon ambient pressure drying.…”

mentioning

confidence: 90%

“…Among several systems, the entrapment of magnetic nanoparticles into silica aerogels can provide them with magnetic properties, and this is an extra advantage for many applications such as catalysis, separation, drug delivery, etc. [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Design of multifunctional magnetic hybrid silica aerogels with improved properties

Maleki

Durães

Costa

et al. 2016

Microporous and Mesoporous Materials

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Silica aerogel–iron oxide nanocomposites: recoverable catalysts for the oxidation of alcohols with hydrogen peroxide

Cited by 10 publications

References 63 publications

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling

Selective oxidation of aromatic hydrocarbons by potassium and phosphorous-modified iron oxide–silica nanocomposite

Design of multifunctional magnetic hybrid silica aerogels with improved properties

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Silica aerogel–iron oxide nanocomposites: recoverable catalysts for the oxidation of alcohols with hydrogen peroxide

Cited by 10 publications

References 63 publications

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO2/NiO Nanoparticles: Artificial Neural Network Modeling

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO2/NiO Nanoparticles: Artificial Neural Network Modeling

Selective oxidation of aromatic hydrocarbons by potassium and phosphorous-modified iron oxide–silica nanocomposite

Design of multifunctional magnetic hybrid silica aerogels with improved properties

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Product

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Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling