A double-shelled yolk-like structure as an ideal magnetic support of tiny gold nanoparticles for nitrophenol reduction

Zeng, Tao; Zhang, Xiaole; Wang, Saihua; Ma, Yurong; Niu, Hongyun; Cai, Yaqi

doi:10.1039/c3ta12660a

Cited by 81 publications

(49 citation statements)

References 40 publications

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“…3,[17][18][19][20][21][22][23] The catalytic reduction of water soluble aromatic pollutants by heterogeneous catalysts has many advantages like easy operation, clean processing, high efficiency, low cost, etc. 27 To avoid aggregation of metal colloids and achieve better catalysis efficiency, various supports such as alumina, 28 zeolites 29 or metal oxides, 30,31 or polymeric materials such as dendrimers, 32,33 hyperbranched polymers, 34 polystyrene microspheres, 35 microgels, 36 and polyelectrolyte brushes 37,38 have been explored. [24][25][26] However, like other metal colloids, gold colloids are usually easy to aggregate together, thus leading to attenuated catalytic efficiency.…”

Section: Introductionmentioning

confidence: 99%

A multifunctional statistical copolymer vesicle for water remediation

Xiao

2016

Polym. Chem.

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Multifunctional statistical copolymers can be simply synthesized in one step without tedious and timeconsuming procedures. In addition, the fuzzy boundary between different functional groups in the statistical copolymers can facilitate the fabrication of new functional nanomaterials. Herein, we designed a novel multifunctional vesicle based on a statistical copolymer, poly[[2-hydroxy-3-(naphthalen-1-ylamino) propyl methacrylate]-stat-[2-(diethylamino)ethyl methacrylate]] [P(HNA 21 -stat-DEA 35 )] which can be synthesized by reversible addition-fragmentation transfer (RAFT) polymerization in one step. The HNA moiety is designed for capturing polycyclic aromatic hydrocarbons (PAHs) by π-π stacking, while the DEA moiety is engineered to immobilize gold nanoparticles for facilitating the reduction of 4-nitrophenol (4-NP) in aqueous solution. This vesicle showed excellent ability in water remediation by absorbing PAHs and accelerating the reduction of 4-nitrophenol (4-NP). Overall, this multifunctional statistical copolymer vesicle provides a new insight for designing multifunctional water remediation materials. † Electronic supplementary information (ESI) available: Synthesis, and characterization. See

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Section: Introductionmentioning

confidence: 99%

A multifunctional statistical copolymer vesicle for water remediation

Xiao

2016

Polym. Chem.

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“…A major problem of the yolk-shell catalysts that needs to be resolved is the requirement of tedious filtration or centrifugation during the recovery and reuse, which greatly limits their practical applicability. Yolk-shell nanostructured catalysts with magnetic NP interior spaces represent a promising framework for the development of catalytic nanoreactor systems with high activity, selectivity and recyclability, which can tackle the issues of conventional nanocatalysts [71]. Yao et al introduced a facile method to fabricate yolk-shell composites with an iron oxide core and mesoporous SiO2 shell with Pd NPs anchoring on the inner surface and studied their catalytic activity in the reduction of 4-nitrophenol [72].…”

Section: Silica Coatingmentioning

confidence: 99%

Magnetically Separable and Sustainable Nanostructured Catalysts for Heterogeneous Reduction of Nitroaromatics

Shokouhimehr

2015

Catalysts

185

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This review is focused on the strategies and designs of magnetic nanostructured catalysts showing the enhanced and sustainable catalytic performances for the heterogeneous reduction of nitoaromatics. Magnetic catalysts have the benefits of easy recovery and reuse after the completion of the reactions and green chemical processes. Magnetic separation, among the various procedures for removing catalysts, not only obviates the requirement of catalyst filtration or centrifugation after the completion of reactions, but also provides a practical technique for recycling the magnetized nanostructured catalysts. Consequently, discussions will address the methodologies and exemplars for the reusable magnetic composite catalysts. Because the synthesis of ideal magnetic nanostructured catalysts is of primary importance in the development of high-quality sustainable processes, the designs, preparation methods and recyclability of various recoverable magnetic nanostructured catalysts are emphasized. The representative methods and strategies for the synthesis of durable and reusable magnetic nanostructured catalysts are highlighted. The advantages, disadvantages, recyclability and the efficiency of the introduced heterogeneous systems have been explored in the reduction of nitrobenzene derivatives.

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“…47 Meanwhile, only six repetition of Fe 3 O 4 @C@Ag−Au composite microspheres in nitroaromatic compound reduction was reported in that of An et al report. 47 Meanwhile, only six repetition of Fe 3 O 4 @C@Ag−Au composite microspheres in nitroaromatic compound reduction was reported in that of An et al report.…”

Section: Catalytic Reduction Of Methylene Blue (Mb) Dye and The Reactmentioning

confidence: 99%

Thermo-stable hollow magnetic microspheres: preparation, characterization and recyclable catalytic applications

Zeng

et al. 2015

J. Mater. Chem. A

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Thermo-stable hollow magnetic microspheres are prepared by layer-by-layer (LbL) assembly on a uniform melamineformaldehyde resin microsphere template coated by silica and calcination for burning off organic resin. Trypsin is immobilised by their coated polydopamine layer, and nanogolds are assembled onto microspheres by LbL method for catalytic applications. The morphologies and hollow structures are observed by scanning electron microscope and transmission electron microscope. The characteristics are investigated by Fourier transfer infrared spectra, thermogravimetric analysis and vibrating sample magnetometer. Meanwhile, the catalytic characteristics of nanogolds and trypsin are evaluated by ultraviolet-visible spectra. The prepared hollow thermo-stable magnetic microspheres are narrowdispersed with relatively low coefficient of variation, and their size ranging from 0.5 μm to 5.0 μm and saturation magnetization (4-30 emu·g -1 ) can be regulated by different conditions. Combined with magnetic separation and calcination activation or regeneration, these microspheres can also be reused for over 20 times for nanogold catalyst and over 32 times for trypsin catalyst reconjugation without any significant loss in catalytic activity, indicating their considerable potential for recyclable catalytic applications. in our previous research, and importantly, MF organic template could simply be removed by calcination. Recently, MF microspheres with various diameters in the range of 0.5-5.0 μm were synthesised in our research. 23 The size could easily be changed by altering the

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A double-shelled yolk-like structure as an ideal magnetic support of tiny gold nanoparticles for nitrophenol reduction

Cited by 81 publications

References 40 publications

A multifunctional statistical copolymer vesicle for water remediation

A multifunctional statistical copolymer vesicle for water remediation

Magnetically Separable and Sustainable Nanostructured Catalysts for Heterogeneous Reduction of Nitroaromatics

Thermo-stable hollow magnetic microspheres: preparation, characterization and recyclable catalytic applications

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