【摘要】 本文通过辐射法成功地制备出MIL-125衍生的蛋黄壳结构的MIL-125/TiO₂/Pt/CdS和中空结构的TiO₂/Pt/CdS可见光催化剂.通过γ射线还原反应中,金属有机框架材料被部分或完全水解为TiO₂纳米片,形成了蛋黄壳或中空的异质结构.在可见光照射下,蛋黄壳结构的MIL-125/TiO₂/Pt/CdS产氢速率为2.9835mmol·g^-1·h^-1,而中空结构的TiO₂/Pt/CdS的产氢速率为1.9342mmol·g^-1·h^-1,分别是纯CdS的7.9和5.1倍.该结构优异的光催化性能可归因于对太阳光的有效吸收和利用,中空及卵黄壳的多孔结构促进物质的转移传输,以及TiO₂纳米片、CdS和Pt纳米颗粒之间的紧密接触可以改善光生电子空穴对的分离.这项工作为使用γ射线辐射法合成金属有机框架材料衍生的可见光催化剂开辟了一种新方法.更多还原

【Abstract】 The yolk-shell MIL-125/TiO₂/Pt/CdS and hollow TiO₂/Pt/CdS visible-light catalysts were successfully synthesized from MIL-125 byγ-ray irradiation.During the reduction process by γ-ray irradiation,metal organic frameworks are partially or completely hydrolyzed to TiO₂ nanosheets,forming the unique yolk-shell or hollow structure.The hydrogen production rate is 2.9835 mmol·g^-1·h^-1 for yolk-shell structures and 1.9342 mmol·g^-1·h^-1for hollow structures under visible-light illumination,which is 7.9 and 5.1 times higher than that of CdS,respectively.The excellent properties of these photocatalysts may be attributed to the effective absorption and utilization of the light,the porous yolk-shell or hollow structure derived from MIL-125 to facilitate mass transfer,and close contact among CdS nanoparticles,TiO₂ nanosheets and Pt nanoparticles to improve the separation of electron-hole pairs.This research can provide a simple and new method for the construction of high efficiency photocatalysts derived from MOFs using the γ-ray irradiation.更多还原