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Construction of a thermo-responsive copolymer-stabilized Fe3O4@CD@PdNP hybrid and its application in catalytic reduction
Polymer Chemistry ( IF 4.6 ) Pub Date : 2019/12/06 , DOI: 10.1039/c9py01529a
Yu Yang 1, 2, 3, 4 , Haichao Duan 1, 2, 3, 4 , Siwen Xia 1, 2, 3, 4 , Changli Lü 1, 2, 3, 4
Affiliation  

A novel and convenient method for fabricating homogeneous nanocatalysts with high catalytic activity and controllable reusability is promising for catalytic reduction. In this study, a high-efficiency magnetic recyclable nanocatalyst (PFe3O4@CD@PdNPs) was successfully prepared via depositing highly dispersed palladium nanoparticles (Pd NPs) on a thermo-responsive copolymer support functionalized with superparamagnetic Fe3O4 nanoparticles (NPs) with carbon dots (CDs) as both a stabilizing and reducing agent. The thermo-responsive copolymers with catechol end groups could be facilely anchored onto Fe3O4 NPs (PFe3O4) through a mussel-inspired chemistry strategy. The well-dispersed ultrafine Pd NPs were located on Fe3O4 NPs decorated with copolymer brushes using an episulfide ligand-containing copolymer as a costabilizer. Fourier transform infrared spectroscopy, thermogravimetric analysis and other tests proved that the copolymer brushes were successfully grafted on the surface of the Fe3O4 NPs. Moreover, transmission electron microscopy and X-ray photoelectron spectroscopy confirmed the presence of CDs in the nanohybrids. In addition, the PFe3O4@CD@PdNPs showed interesting thermo-responsive catalytic behaviour because of the presence of thermo-responsive polymer chains on the catalyst surface. Finally, owing to good water dispersibility and the synergistic effect of the Pd NPs with CDs, the PFe3O4@CD@PdNP nanocatalyst possessed higher catalytic activity for the catalytic reduction of different dyes and nitrophenols compared with PdNP@PFe3O4 without CD modification.

中文翻译:

热敏共聚物稳定的Fe3O4 @ CD @ PdNP杂化物的构建及其在催化还原中的应用

一种新颖且方便的制备具有高催化活性和可控重复使用性的均相纳米催化剂的方法有望用于催化还原。在这项研究中,通过将高度分散的钯纳米粒子(Pd NPs)沉积在用超顺磁性Fe 3 O 4纳米粒子功能化的热响应共聚物载体上,成功制备了一种高效的磁性可回收纳米催化剂(PFe 3 O 4 @ CD @ PdNPs )(碳点(CD)作为稳定剂和还原剂的NPs)。具有邻苯二酚端基的热敏共聚物可以轻松地固定在Fe 3 O 4 NPs(PFe 3 O 4),以贻贝为灵感的化学策略。分散良好的超细Pd NP位于使用共聚物刷装饰的Fe 3 O 4 NP上,使用含有环硫醚配体的共聚物作为助稳定剂。傅里叶变换红外光谱,热重分析和其他测试证明,共聚物刷已成功接枝到Fe 3 O 4 NPs的表面上。此外,透射电子显微镜和X射线光电子能谱证实了纳米杂化物中CD的存在。另外,PFe 3 O 4由于在催化剂表面上存在热响应性聚合物链,因此@ CD @ PdNPs表现出令人感兴趣的热响应催化行为。最后,由于良好的水分散性和钯纳米颗粒的与光盘的协同效应,该PFE 3 ö 4 @ CD @ PdNP纳米催化剂具有更高的催化活性为催化还原不同染料和硝基酚与PdNP相比@ PFE 3 ö 4无CD修改。
更新日期:2020-02-13
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