负载钯纳米粒子聚电解质空心微球的制备及其还原对硝基苯酚的催化活性

用表面引发原子转移自由基聚合法(SI-ATRP)在二氧化硅纳米粒子表面接枝聚碘化甲基丙烯酸三甲基胺基乙酯(PMETAI),原位还原静电吸附的PdCl62-后刻蚀除去二氧化硅模板,成功制备了Pd纳米粒子复合聚电解质空心微球(air@PMETAI@Pd)。 用透射电子显微镜(TEM)、红外光谱仪(FTIR)、能谱仪(EDX)、热重分析仪(TGA)等技术手段对所制备的空心微球进行表征。 结果表明,Pd纳米粒子均匀负载在聚电解质微球上,其直径约为(1.5±0.2) nm。 将负载Pd纳米粒子的微球作为催化剂应用于硼氢化钠还原4-硝基苯酚反应,显示出很好的催化效果且具有较好的回收利用性。

Preparation of Palladium/Polyelectrolyte Hollow Nanospheres and Their Catalytic Activity in 4-Nitrophenol Reduction

Pd/polyelectrolyte hollow nanospheres were prepared by a facile method that combined the surface-initiated atom transfer radical polymerization(SI-ATRP) and in situ growth of metal nanoparticles. Transmission electron microscopy(TEM), Fourier transform infrared spectra(FTIR), energy-dispersive X-ray(EDX) and thermogravimetric analysis(TGA) were used to characterize the morphology and structure of air@PMETAI@Pd(PMETAI:poly{2-(methacryloyloxy)ethyl] trimethylammonium iodide}) nanospheres. The result shows that Pd nanoparticles with diameter of (1.5±0.2) nm are homogeneously embedded inside the polyelectrolyte layer. Catalytic activity of the Pd/polyelectrolyte hollow nanospheres was investigated by the reduction of 4-nitrophenol with NaBH₄ as a model reaction. It is found that they displayed excellent catalytic properties and good reusability.