Ni,Ru掺杂CePO4纳米材料的合成与仿酶性质

通过水热方法合成了具有高比表面积的Ni, Ru掺杂CePO₄纳米粒子(NiRu-CePO₄). 结合纳米粒子的X射线衍射(XRD)、 扫描电子显微镜(SEM)、 透射电子显微镜(TEM)和X射线能谱(EDX)的表征结果发现, NiRu-CePO₄符合六方相磷酸铈, 纳米粒子长轴尺寸约为20 nm, Ni和Ru均匀分布于纳米CePO₄中; 样品的BET表面积高达178.4 m²/g, ζ电势为-18.2 mV. 以3,3',5,5'-四甲基联苯胺(TMB)作为电子供体和显色剂, 通过分光光度法监测652 nm处的吸光度值对产物浓度进行分析, 结果表明, NiRu-CePO₄催化剂在宽泛的pH范围内表现出类过氧化物酶和类氧化酶活性. 对催化后的催化剂进行表征, 发现样品形貌、 元素分散性和表面Ce的价态均未显著变化, 表明NiRu-CePO₄具有较高的稳定性.

Synthesis and Enzymatic Activity of Ni,Ru Co-doped CePO4 Nanomaterials †

NiRu-CePO₄ nanoparticles with high specific surface area were synthesized by a simple hydrothermal method, which could avoid the separate nucleation process of the precious metal. The X-ray diffraction(XRD) pattern of NiRu-CePO₄ is consistent with hexagonal cerium phosphate. The transmission eletron microscopy(TEM) and energy dispersive X-ray(EDX) characterization indicated that the nanoparticles have a length of ca. 20 nm along the longitude and the doped metals Ni and Ru are uniformly dispersed. The BET area is determined as 178.4 m²/g, and the zeta potential as -18.2 mV. NiRu-CePO₄ exhibits good peroxidase-like and oxidase-like activities in wide pH range. 3,3',5,5'-tetramethylbenzidine(TMB) was used as the electron donor and the chromogenic reagent, and the activities were evaluated by monitoring the absorbance at 652 nm. The morphology, dispersion of the elements and valence state of Ce had no significant change when characterizing the used catalyst, confirming the good stability of NiRu-CePO₄.