Ultra-fast microwave-assisted reverse microemulsion synthesis of Fe3O4@SiO2 core–shell nanoparticles as a highly recyclable silver nanoparticle catalytic platform in the reduction of 4-nitroaniline

Lu, Changyong; Puig, T.; Obradors, X.; Ricart, Susagna; Ros, Josep

doi:10.1039/c6ra19435d

Cited by 32 publications

(21 citation statements)

References 45 publications

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“…Figure 3 shows the UV–vis absorbance spectra of silver colloids, FePt nanocrystals, and FePt–Ag 10 mg–120 mL nanocomposites. It is well established that silver colloids exhibit a plasmon absorption band in the visible region on account of the coherent excitation of the free electrons within the conduction band [ 46 ]. In general, the plasmon absorption band of silver nanocrystals is around 420 nm, while Fe and Pt nanocrystals have no specific absorption peak in this region [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient, Low-Cost, and Magnetically Recoverable FePt–Ag Nanocatalysts: Towards Green Reduction of Organic Dyes

et al. 2018

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Nowadays, synthetic organic dyes and pigments discharged from numerous industries are causing unprecedentedly severe water environmental pollution, and conventional water treatment processes are hindered due to the corresponding sophisticated aromatic structures, hydrophilic nature, and high stability against light, temperature, etc. Herein, we report an efficient fabrication strategy to develop a new type of highly efficient, low-cost, and magnetically recoverable nanocatalyst, i.e., FePt–Ag nanocomposites, for the reduction of methyl orange (MO) and rhodamine B (RhB), by a facile seed deposition process. X-ray diffraction results elaborate that the as-synthesized FePt–Ag nanocomposites are pure disordered face-centered cubic phase. Transmission electron microscopy studies demonstrate that the amount of Ag seeds deposited onto the surfaces of FePt nanocrystals increases when increasing the additive amount of silver colloids. The linear correlation of the MO and RhB concentration versus reaction time catalyzed by FePt–Ag nanocatalysts is in line with pseudo-first-order kinetics. The reduction rate constants of MO and RhB increase with the increase of the amount of Ag seeds. FePt–Ag nanocomposites show good separation ability and reusability, and could be repeatedly applied for nearly complete reduction of MO and RhB for at least six successive cycles. Such cost-effective and recyclable nanocatalysts provide a new material family for use in environmental protection applications.

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Section: Resultsmentioning

confidence: 99%

Highly Efficient, Low-Cost, and Magnetically Recoverable FePt–Ag Nanocatalysts: Towards Green Reduction of Organic Dyes

et al. 2018

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“…The microwave-assisted method can also be used to assist in the synthesis of Fe 3 O 4 @SiO 2 NPs. Lu et al prepared Fe 3 O 4 @SiO 2 NPs with a very thin SiO 2 shell (2.5 nm) by a novel microwave-assisted reverse microemulsion method [ 66 ]. The microemulsion method has the advantage of controlling the shape, size distributions and shell thickness.…”

Section: Surface Modification Of Magnetic Iron Oxide Nanoparticlesmentioning

confidence: 99%

Surface Modification of Magnetic Iron Oxide Nanoparticles

et al. 2018

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Functionalized iron oxide nanoparticles (IONPs) are of great interest due to wide range applications, especially in nanomedicine. However, they face challenges preventing their further applications such as rapid agglomeration, oxidation, etc. Appropriate surface modification of IONPs can conquer these barriers with improved physicochemical properties. This review summarizes recent advances in the surface modification of IONPs with small organic molecules, polymers and inorganic materials. The preparation methods, mechanisms and applications of surface-modified IONPs with different materials are discussed. Finally, the technical barriers of IONPs and their limitations in practical applications are pointed out, and the development trends and prospects are discussed.

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“…For the reduction reactions, FS‐based noble metal catalysts are preferential however the non‐noble metal catalysts immobilized on FS are also recently utilized . To investigate the catalytic efficacy of metal NPs in reduction reactions, p ‐nitrophenol reduction to p ‐aminophenol has been employed as the model reaction .…”

Section: Applications and Advantages Of Fs‐based Catalystsmentioning

confidence: 99%

Functionalized Silicas for Metal‐Free and Metal‐Based Catalytic Applications: A Review in Perspective of Green Chemistry

Antony

Marimuthu

Yang

et al. 2019

The Chemical Record

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Heterogeneous catalysis plays a key role in promoting green chemistry through many routes. The functionalizable reactive silanols highlight silica as a beguiling support for the preparation of heterogeneous catalysts. Metal active sites anchored on functionalized silica (FS) usually demonstrate the better dispersion and stability due to their firm chemical interaction with FSs. Having certain functional groups in structure, FSs can act as the useful catalysts for few organic reactions even without the need of metal active sites which are termed as the covetous reusable organocatalysts. Magnetic FSs have laid the platform where the effortless recovery of catalysts is realized just using an external magnet, resulting in the simplified reaction procedure. Using FSs of multiple functional groups, we can envisage the shortened reaction pathway and, reduced chemical uses and chemical wastes. Unstable bio‐molecules like enzymes have been stabilized when they get chemically anchored on FSs. The resultant solid bio‐catalysts exhibited very good reusability in many catalytic reactions. Getting provoked from the green chemistry aspects and benefits of FS‐based catalysts, we confer the recent literature and progress focusing on the significance of FSs in heterogeneous catalysis. This review covers the preparative methods, types and catalytic applications of FSs. A special emphasis is given to the metal‐free FS catalysts, multiple FS‐based catalysts and magnetic FSs. Through this review, we presume that the contribution of FSs to green chemistry can be well understood. The future perspective of FSs and the improvements still required for implementing FS‐based catalysts in practical applications have been narrated at the end of this review.

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Ultra-fast microwave-assisted reverse microemulsion synthesis of Fe₃O₄@SiO₂ core–shell nanoparticles as a highly recyclable silver nanoparticle catalytic platform in the reduction of 4-nitroaniline

Abstract: Highly efficient silver catalytic platform Fe3O4@SiO2 core–shell nanoparticles is synthesized via novel microwave-assisted reverse microemulsion fast methodology.

Cited by 32 publications

References 45 publications

Highly Efficient, Low-Cost, and Magnetically Recoverable FePt–Ag Nanocatalysts: Towards Green Reduction of Organic Dyes

Highly Efficient, Low-Cost, and Magnetically Recoverable FePt–Ag Nanocatalysts: Towards Green Reduction of Organic Dyes

Surface Modification of Magnetic Iron Oxide Nanoparticles

Functionalized Silicas for Metal‐Free and Metal‐Based Catalytic Applications: A Review in Perspective of Green Chemistry

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