金纳米颗粒的掺杂蛋白介孔硅原位合成及其对p-硝基苯酚的催化

In-situ synthesis of gold nanoparticles on protein-doped meso-porous silicon and catalytic property for p-nitrophenol reduction

基于介孔硅材料,在其表面掺杂牛血清白蛋白,构建了一种可实现贵金属纳米材料原位制备的蛋白掺杂介孔材料MCM-BSA。通过紫外、红外、吸脱附、透射电镜等表征手段,表明掺杂后的材料兼有蛋白和介孔硅2种特性。以MCMBSA为载体,即可原位还原氯金酸制备金纳米粒,获得负载金纳米粒的复合材料GNPs@MCM-BSA。以对硝基苯酚的催化还原为模型反应,考察了掺杂蛋白介孔硅负载的金纳米粒的催化性能,发现其具有很好的对硝基苯酚催化能力。更为重要的是,该复合材料可回收循环利用6次以上,对硝基苯酚的转化率都接近100%,表明掺杂蛋白介孔硅是一类性能优异的新型纳米晶载体,可应用于环境污染物的催化还原。

Bovine serum albumin was doped onto the surface of a mesoporous silicon-based material（ MCM-BSA） to construct protein-doped mesoporous materials for use in the in situ preparation of noble metal nanomaterials. Ultraviolet-visible absorption and infrared spectroscopy,N_2adsorption-desorption,and tunneling electron microscopy demonstrated that the MCM-BSA materials exhibited the characteristics of protein as well as that of mesoporous silicon. Using MCM-BSA as the carriers,chloroauric acid was reduced in situ to gold nanoparticles,which led to the production of the composite GNPs@ MCM-BSA loaded with gold nanoparticles. To investigate the catalytic efficiency and reusability of the GNPs@ MCM-BSA composites,reduction of 4-nitrophenol was performed. The resulting GNPs@ MCM-BSA composites exhibited good catalytic activity toward nitrophenol reduction. Notably,these catalysts could be easily recovered and reused for at least six successive cycles with almost 100% conversion of nitrophenol. Therefore,MCM-BSA shows promising application as a good nanoparticle carrier that can be applied to catalytic reduction of environmental pollutants.