h-BNNS的掺杂改性及其光催化性能

为了发挥纳米贵金属与聚合物基体的协同光催化作用,采用RGO对六方氮化硼纳米片(h-BNNS)进行C元素、O元素掺杂,得到多孔掺杂氮化硼材料(BCNO),通过水热法将银纳米粒子(Ag NPs)负载在BCNO基体上制备BCNO/Ag复合材料,并对复合材料的组成、微观结构和光催化性能进行表征,以CO₂光催化还原为反应模型测试BCNO/Ag复合材料的光催化性能。结果表明：经过非金属掺杂改性后的氮化硼仍然具有稳定的多晶结构;负载Ag NPs后,Ag NPs的等离子共振效应不仅显著增强了BCNO基体对紫外-可见光的吸收能力,而且提高了光生载流子的分离效率;复合材料制备过程中,当银的加入量为3.0%、复合样品焙烧温度为130 ℃时,得到的复合材料具有最佳的光催化性能,CO₂还原成CO的转化率为4.68 μmol/(g·h)。因此,通过掺杂改性后的h-BNNS能够更好地稳定负载纳米贵金属,充分发挥纳米银与BCNO两者的协同光催化性能,为有机-无机纳米光催化剂的有效复合及性能研究提供理论基础。

Doping modification of h-BNNS and its photocatalytic properties

In order to exert the synergistic photocatalytic effect of nano-noble metal and polymer matrix, hexagonal boron nitride nanosheets (h-BNNS) were doped with C and O elements by RGO to obtain porous doped boron nitride materials (BCNO), and silver nanoparticles (Ag NPs) were loaded on BCNO matrix by hydrothermal method to prepare BCNO/Ag composites. The composition, microstructure and photocatalytic properties of the composites were characterized. The photocatalytic properties of BCNO/Ag composites were tested by reducing CO2 to CO as a reaction model. The results show that boron nitride modified by nonmetal doping still has a stable polycrystalline structure; After loading Ag NPs, the plasma resonance effect of Ag NPs not only significantly enhances the absorption ability of BCNO matrix to ultraviolet-visible light, but also improves the separation efficiency of its photogenerated carriers; During the preparation of composite materials, the composite material obtained with the addition of 3.0% silver and the calcination temperature of the composite sample at 130 ℃ exhibits the best photocatalytic performance, and the conversion rate of CO2 to CO is 4.68 μmol/（g·h）. Therefore, h-BNNS modified by doping can better stably load nano-precious metals, thus giving full play to the synergistic photocatalytic performance of Ag nanoparticle and BCNO, which provides a theoretical basis for the effective composite and performance research of organic-inorganic nanophotocatalyst.