La掺杂钛酸钙光催化剂在可见光下分解水制氢的影响因素

以柠檬酸为络合剂,采用溶胶-凝胶法制备了钙钛矿型光催化剂Ca_{0. 99}La_{0. 01}TiO₃,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、紫外-可见漫反射光谱仪(UV-Vis DRS)等对光催化剂材料进行了表征,并考察了N掺杂对光催化剂催化效果的影响,探究了可见光条件下,Ca_{0. 99}La_{0. 01}TiO_3-xN_x在不同Pt负载量及不同种类牺牲剂中光催化分解水的产氢量,并进行相关荧光猝灭分析.结果表明,在可见光条件下,Pt负载量为1%且掺杂N的钙钛矿光催化剂在Na₂SO₃/Na₂S作为牺牲剂时,光催化分解水的产氢量最高.

Influential Factors of La-doped Calcium Titanate for Photocatalytic H2 Evolution Under Visible Light †

For photocatalytic H ₂ evolution from water splitting, perovskite photocatalyst Ca _0.99La _0.01TiO ₃ was prepared by sol-gel method with citric acid as complexing agent. The influence of N doping on photocatalytic activity was investigated. The hydrogen-producing capacity of Ca _0.99La _0.01TiO _{3- x}N _x with different Pt loading and different kinds of sacrificial agents was also investigated under visible light irradiation. The photocatalytic materials were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS). The results show that under the irradiation of visible light, the perovskite photocatalyst Pt-Ca _0.99La _0.01TiO _{3- x}N _x with 1% Pt-loading has the highest photocatalytic activity of hydrogen production from water when Na ₂SO ₃/Na ₂S is used as the sacrificial agent. Pt-loading promotes photocatalytic reaction and improves photocatalytic activity.