铜纳米颗粒修饰多孔氮化硼高效还原对硝基苯酚的研究

为了寻找高催化活性、环境友好、价格低廉、稳定性好的催化剂，研究金属与载体之间的协同催化效应，采用煅烧前驱体法制备了表面富含羟基和氨基的高比表面积多孔h-BN载体，通过简单的液相还原法成功地制备出粒径分布均匀的Cu/h-BN纳米复合材料，并对复合材料的组成、微观结构和性能进行表征。结果显示，铜纳米粒子的引入并未破坏多孔h-BN的二维片状结构，但比表面积及孔径均有不同程度的下降。以对硝基苯酚(4-NP)还原为对氨基苯酚(4-AP)为模型反应，考察Cu/h-BN复合材料的催化性能，当Cu含量为6%(质量分数)时，复合纳米材料具有最高的催化性能(表观反应速率常数k=4.62×10^-2 s^-1)和稳定性，催化活性在5个循环内基本保持不变。因此，具有高比表面积的h-BN载体负载可稳定Cu纳米颗粒，它们之间的协同催化作用使Cu/h-BN具有优异的催化活性和稳定性。此研究为今后进一步研究金属与h-BN协同催化提供了理论基础。

Reduction of p-nitrophenol by copper nanoparticles modified porous boron nitride

In order to search for catalysts with high catalytic activity, environmental friendliness, low price, and good stability, and to investigate the synergistic catalytic effect between metals and supports, porous h-BN carriers with a large specific surface area, meanwhile rich in hydroxyl and amino groups on the surface, were prepared by the calcined precursor method. Cu/BN nanocomposites with uniform particle size distribution were successfully prepared by a simple liquid phase reduction method. The composition, microstructure and properties of the composites were characterized. The results show that the introduction of Cu NPs does not destroy the two-dimensional sheets structure of porous h-BN, but the specific surface area and pore size decrease to varying degrees. Through investigating the catalytic performance of Cu/h-BN composite materials by using the reduction of p-nitrophenol (4-NP) to p-aminophenol (4-AP) as a model reaction, it shows that when the Cu NPs content is 6% (mass fraction), the Cu/h-BN composite material exhibits the best catalytic activity (the reaction rate constant k= 4.62×10-2 s-1) and stability, and the catalytic activity remains unchanged in five cycles. Therefore, the h-BN carrier with a high specific surface area can stabilize Cu nanoparticles, and the synergistic catalytic effect between them enables Cu/h-BN to have excellent catalytic activity and stability. The study provides a theoretical basis for further research on the synergistic catalysis of metals and h-BN in the future.