Magnetically Separable Nanocatalyst with the Fe<sub>3</sub>O<sub>4</sub> Core and Polydopamine-Sandwiched Au Nanocrystal Shell

Zhang, Jianfeng; Fang, Qunling; Duan, Jinyu; Xu, Hongmei; Xu, Hua‐Jian; Xuan, Shouhu

doi:10.1021/acs.langmuir.8b00302

Cited by 62 publications

(34 citation statements)

References 41 publications

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“…It is shown in Figure A that the curve of MoS 2 ‐PDA shows a decrease in peak intensity, especially for the characteristic peak (002) of MoS 2 , which is mainly due to the successful presence of PDA layer on the surface of 2D MoS 2 . Diffraction peaks of MoS 2 ‐PDA are similar to that of MoS 2 because PDA is amorphous and no new diffraction peak is observed in MoS 2 ‐PDA, which reflects that the crystal structure of MoS 2 is mostly preserved and not affected significantly by the PDA coating. After the introduction of Ni(OH) 2 , the diffraction peaks of Ni(OH) 2 such as (001), (100), (101), (102), and (110) peaks (JCPDS card no.…”

Section: Resultsmentioning

confidence: 84%

“…Dopamine (DA), inspired by the strong adhesion of mussel, is able to form adhesive polydopamine (PDA) coating on different surfaces owing to self-polymerization by simple dip-coating of objects in a buffer solution. [21][22][23][24] The simple operation and versatility of musselinspired chemistry make it possible to be applied for the incorporation of nanosheets hybrids. Furthermore, the PDA can provide abundant hydroxyl groups and amine groups towards further decoration and modification.…”

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confidence: 99%

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Mussel‐inspired decoration of Ni(OH)₂ nanosheets on 2D MoS₂ towards enhancing thermal and flame retardancy properties of poly(lactic acid)

Gao

Wang

Zhou

et al. 2019

Polymers for Advanced Techs

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In the present work, a facile and environmental method was developed to fabricate the novel functionalized MoS2 hybrid. Firstly, MoS2 nanosheets were coated with polydopamine (PDA) through the self‐polymerization of dopamine (MoS2‐PDA) in a buffer solution. Then the decoration of Ni(OH)2 on the MoS2‐PDA was synthesized because of the strong affinity of Ni2+ with hydroxyl groups in PDA. Finally, the as‐synthesized MoS2‐PDA@Ni(OH)2 was introduced into poly(lactic acid) (PLA) matrix to explore flame retardancy, thermal stability, and crystalline property of the composites. As confirmed by X‐ray diffraction (XRD), Fourier‐transform infrared spectrometer (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), the MoS2 nanosheets were dually modified with PDA and Ni(OH)2 without destroying the original structures. The thermal degradation of PLA with MoS2‐PDA@Ni(OH)2 generated a notably higher yield of char. Moreover, the crystallization rate of composites is higher than neat PLA. The cone calorimeter test revealed that the introduction of 3% MoS2‐PDA@Ni(OH)2 resulted in lower Peak Heat Release Rate (PHRR) (decreased by 21.7%). Thus, the research provided an innovative functionalization method for manufacturing PLA composites with high performances.

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Section: Resultsmentioning

confidence: 84%

mentioning

confidence: 99%

Mussel‐inspired decoration of Ni(OH)₂ nanosheets on 2D MoS₂ towards enhancing thermal and flame retardancy properties of poly(lactic acid)

Gao

Wang

Zhou

et al. 2019

Polymers for Advanced Techs

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“…The group of Fang, Xuan et al. fabricated gold catalysts with gold sandwiched between PDA layers generated on a magnetic Fe 3 O 4 core (Figure ) . Of two samples, 9.3 % PDA/Au 0 ‐PDA/Fe 3 O 4 was characterized by a particle size of 260 nm, an outer PDA layer of 5 nm, and gold particles of 4–8 nm.…”

Section: Removal Of Toxic Materialsmentioning

confidence: 99%

Polydopamine – its Prolific Use as Catalyst and Support Material

Molnár

2020

ChemCatChem

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Polydopamine is a mussel-inspired functional material with a unique ability to form surface coatings. It is a green, environmentally benign product available very easily for a multitude of varied applications. This review attempts to collect useful information with respect to polydopamine-based catalytic studies with the use of polydopamine and modified polydopamine preparations loaded with varied catalytically active species including metal ions and metal particles. Major sections are about the use of polydopamine as catalyst material, utilization of immobilized enzymes, removal of toxic materials, results in organic synthesis, and fuel cell applications. A few examples of chiral catalysis and results of recycling studies are also treated. Data collected and analyzed indicate the importance and high potential of polydopamine-based catalysts in sustainable chemistry. of subunits attacked by an immobilized cyclohexeneamine (5) was suggested to be the transition state of CÀ C bond formation.Edouard et al. prepared catalyst 0.29 % PDA/PU by depositing PDA onto polyurethane foam (PU, 180 � 20 mg, 8 cm 3 ) and used it for the reduction of methylene blue (MB) with NaBH 4 . [48] Activities decreased gradually with repeated uses from 100 % to 35 % in run 11 but partial reactivation was achieved upon keeping the sample at 67°C for 8 h (55 % dropping below 10 % in run 13). Exposure to air at room temperature for six days proved to be somewhat more beneficial (90 % conversion in run 14 decreasing to 48 % in run 18). In a recent study they fabricated two oxidized PDA/PU samples and then loaded them with NaBH 4 . [49] One made by the usual method (dopamine/Tris, rt, 12 h, in air; sample PDA O2 PU), whereas the other was made by treating PU in a mixture of dopamine, NaOAc, and NaIO 4 (pH 5, rt, 24 h). The sample was dried (67°C) and washed thoroughly with water (PDA NaIO4 PU). Both products were dipped into an aqueous solution of NaBH 4 (0.1 M, 10 min) to afford boron contents of 2.37 and 2.11 wt%. The catalysts tested in the degradation of MB showed high activities with efficiencies of 97 % and 98 %, respectively (NaBH 4 /MB molar ratio 40, 177 mg and 209 mg catalysts, 25 min). During five reuses, the pH of the reaction medium increased because of boron loss (0.78 wt% and 0.81 wt%). The activity of PDA NaIO4 PU decreased to 89 % in run five. However, dipping the used sample into a 0.1 M NaBH 4 solution restored the original efficiency of 98 %. This, however, was only a temporary remedy, since a low efficiency of 60 % was measured in run 10. PDA was suggested by the authors to act as a redox mediator to prevent the hydrolysis/oxidation of immobilized borohydride.This formula (5) should be moved up and placed before the paragraph starting with "Edouard et al…"The Zuo group used PDA particles (avg. diameter 240 nm) to induce the reduction of MB and rhodamine B (RhB) with NaBH 4 . [50] Quinone moieties of PDA were assumed to channel electrons from NaBH 4 to the dyes. Indeed, PDA oxidized with NaIO 4 exhibited increased degradatio...

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“…In addition, magnetic nanoparticles can be separated by an external magnetic from the reaction mixture. The other benefits of the magnetic nanoparticles are their easy way of preparation, low toxicity and eco‐friendly capacities . Due to the coordination of metals (M) on Fe 3 O 4 surface, Fe 3 O 4 @M shows catalytic properties in cross‐coupling reactions .…”

Section: Introductionmentioning

confidence: 99%

Copper Immobilized on Isonicotinic Acid Hydrazide Functionalized Nano‐Magnetite as a Novel Recyclable Catalyst for Direct Synthesis of Phenols and Anilines

Ghiasbeigi

Soleiman‐Beigi

2019

ChemistrySelect

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A new nano‐catalyst which contains a core of magnetic Fe3O4 nanoparticles (NPs) has been fabricated. It is covered via isonicotinic acid hydrazide and copper (Cu). In this sense, Isonicotinic acid hydrazide (INH) is applied because of its ability as a bidendental ligand and pharmaceutical activity in order to be used for the complexion and connection of Cu on Fe3O4 surface for the synthesis of Fe3O4@INH@Cu (INH= Isonicotinic acid hydrazide). In this regard, Fe3O4@INH@Cu as a heterogeneous nanocatalyst for the cross‐coupling of aryl halides with potassium hydroxide (KOH) as the hydroxide source and ammonium acetate (NH4OAc), as the amine source in the presence of cesium carbonate (Cs2CO3) in polyethylene glycol (PEG‐400), has been applied. The catalyst is a new magnetically recyclable catalytic system with easy preparation and purification, high activity, eco‐friendly and economic advantages.

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Magnetically Separable Nanocatalyst with the Fe₃O₄ Core and Polydopamine-Sandwiched Au Nanocrystal Shell

Cited by 62 publications

References 41 publications

Mussel‐inspired decoration of Ni(OH)₂ nanosheets on 2D MoS₂ towards enhancing thermal and flame retardancy properties of poly(lactic acid)

Mussel‐inspired decoration of Ni(OH)₂ nanosheets on 2D MoS₂ towards enhancing thermal and flame retardancy properties of poly(lactic acid)

Polydopamine – its Prolific Use as Catalyst and Support Material

Copper Immobilized on Isonicotinic Acid Hydrazide Functionalized Nano‐Magnetite as a Novel Recyclable Catalyst for Direct Synthesis of Phenols and Anilines

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Magnetically Separable Nanocatalyst with the Fe3O4 Core and Polydopamine-Sandwiched Au Nanocrystal Shell

Cited by 62 publications

References 41 publications

Mussel‐inspired decoration of Ni(OH)2 nanosheets on 2D MoS2 towards enhancing thermal and flame retardancy properties of poly(lactic acid)

Mussel‐inspired decoration of Ni(OH)2 nanosheets on 2D MoS2 towards enhancing thermal and flame retardancy properties of poly(lactic acid)

Polydopamine – its Prolific Use as Catalyst and Support Material

Copper Immobilized on Isonicotinic Acid Hydrazide Functionalized Nano‐Magnetite as a Novel Recyclable Catalyst for Direct Synthesis of Phenols and Anilines

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Magnetically Separable Nanocatalyst with the Fe₃O₄ Core and Polydopamine-Sandwiched Au Nanocrystal Shell

Mussel‐inspired decoration of Ni(OH)₂ nanosheets on 2D MoS₂ towards enhancing thermal and flame retardancy properties of poly(lactic acid)

Mussel‐inspired decoration of Ni(OH)₂ nanosheets on 2D MoS₂ towards enhancing thermal and flame retardancy properties of poly(lactic acid)