树枝状硅钛杂化纳米球负载金纳米颗粒催化性能研究

Catalytic Performance of Dendritic Mesoporous Silica&Titania Nanospheres(DMSTNs)Supported Gold Nanoparticles

树枝状纳米球独特的三维中心辐射状孔道结构使其具有出色的比表面积和孔体积。客体物质可负载于多级孔道内,形成新型的载体/递送/反应平台。本研究设计构筑了一类具有高稳定性的多功能复合材料——树枝状硅钛杂化纳米球负载金纳米颗粒催化剂。使其经过系列化学反应及改性过程,树枝状硅钛杂化纳米球依旧保持中心辐射状纹理结构,孔道内成功负载了锐钛矿二氧化钛和超细金纳米粒子。结果表明,相较于树枝状二氧化硅纳米球负载金纳米颗粒材料(对比样),设计合成的催化剂展现出更加优越的多功能催化性能。在模拟太阳光下,其光解水产氢量为210.01μmol·g^(-1),约为对比样的10倍。无光条件下,其降解对硝基苯酚的表观动力学常数为2.150×10^(-3) s^(-1),约是对比样(0.111×10^(-3) s^(-1))的19倍。

Dendritic nanospheres with unique three dimension(3D)center-radial channels possess excellent specific surface area and pore volume.Objects can be loaded into the nanochannels of dendritic nanospheres,developing novel carrier,delivery vehicle,or reaction platform.In the work,a novel kind of highly stable multifunctional composite material-dendritic mesoporous silica&titania nanospheres(DMSTNs)supported gold(Au)nanoparticles was explored.Even though DMSTNs have suffered series of chemical reactions and modifications,3D center-radial textures are still unchanged.Anatase TiO_(2) and Au nanoparticles have been successfully decorated onto the channels.The results show that the as-prepared catalysts exhibit more outstanding multipurpose catalytic performances than those of a contrast sample,i.e.,dendritic mesoporous silica nanospheres(DMSNs)supported gold(Au)nanoparticles.Under simulated sunlight for splitting water,the amount of produced H_(2) is 210.01μmol·g^(-1),ca.ten-folds of the contrast sample.Without light irradiation,the apparent kinetic constant of p-nitrophenol reduction by our catalyst is 2.150×10^(-3) s^(-1),being about 19 times as much as the reference(0.111×10^(-3) s^(-1)).