One-pot synthesis of porous monolith-supported gold nanoparticles as an effective recyclable catalyst

One-pot synthesis of porous monolith-supported gold nanoparticles as an effective recyclable catalyst
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一锅法合成多孔整体负载金纳米颗粒作为有效的可回收催化剂

DOI:
10.1039/c5ta02925b
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发表时间:
2015-06
影响因子:
11.9
通讯作者:
Wan, Decheng
Wan, Decheng
中科院分区:
材料科学2区
文献类型:
--
作者:
Ye, Yonglian;Jin, Ming;Wan, Decheng

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金纳米粒子(AuNP)是优秀的催化剂,但其回收仍然是一个主要问题。在多孔整体上支持金纳米粒子是一种流行的策略,但它通常存在多步骤且低效的制备方法。在此,我们展示了一种在多孔整料上支持可回收 AuNP 的一锅策略。众所周知,通过表面活性剂稳定的高内相乳液(HIPE)的油相聚合可以产生宏观多孔整体(polyHIPE)。如果将表面活性剂替换为PEI@PS(聚苯乙烯(PS)和十二烷基官能化的超支化聚乙烯亚胺(PEI))的树枝状两亲物(DA),并且水相中充满氯金酸,则一锅法制备AuNP修饰的polyHIPE(Au-DA-polyHIPE)是可行的。或者,如果使用Au-DA(用PEI@PS稳定的AuNP)代替表面活性剂,则可以类似地获得Au-DA-polyHIPE。 Au-DA-polyHIPE样品具有开孔和多孔结构,可以有效催化4-硝基苯酚的还原。催化材料是可回收的,至少在6个循环内活性不会降低,其中多价和多配体PEI应负责稳定性。
Gold nanoparticles (AuNPs) are excellent catalysts, but their recycling remains a central concern. Support of AuNPs on a porous monolith is one popular strategy but it usually suffers from multistep and inefficient preparation. Herein, we show a one-pot strategy to recyclable AuNPs supported on a porous monolith. It is known that the polymerization of the oil phase of a high internal phase emulsion (HIPE), stabilized by surfactants, can lead to a macroscopic and porous monolith (polyHIPE). If the surfactant is replaced with a dendritic amphiphile (DA) of PEI@PS (hyperbranched polyethylenimine (PEI) functionalized with polystyrene (PS) and dodecyls), and the water phase is charged with chloroauric acid, then the one-pot fabrication of AuNP-decorated polyHIPE (Au-DA-polyHIPE) is feasible. Alternatively, if Au-DA (AuNP stabilized with PEI@PS) is used instead of the surfactants, then Au-DA-polyHIPE can be similarly obtained. The Au-DA-polyHIPE samples have open-cell and porous structure, and can effectively catalyze the reduction of 4-nitrophenol. The catalytic materials are recyclable without any decrease in activity, at least within 6 cycles, in which the multivalent and multi-ligand PEI should be responsible for the stability.
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发表时间: 2015-03
影响因子: 11.9
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