伊红Y敏化Pt负载(001)晶面占优TiO_2纳米片可见光催化制氢的研究

Visible-light photocatalytic hydrogen production over Eosin Y sensitized Pt-TiO_2 nanosheets with preferential(001)facet

以钛酸四丁酯和HF为原料,通过水热法合成了含(001)高能面的TiO_2纳米片。光还原沉积法进行载铂,浸渍法使伊红Y(Eosin Y)负载在Pt-TiO_2表面,制得系列染料敏化的Eosin Y-Pt-TiO_2可见光光催化剂。所制备的催化剂通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)、紫外-可见漫反射(UV-Vis DRS)、比表面(BET)、荧光光谱(PL)和傅立叶红外光谱(FT-IR)等手段进行表征。实验表明,当Eosin Y浓度一定时,HF用量和载Pt量对催化剂的制氢活性有显著影响。当HF用量为3 mL时,Eosin Y敏化Pt负载(001)晶面占优TiO_2纳米片的可见光制氢活性是纯TiO_2纳米颗粒的2.1倍,这可能与TiO_2(001)面含量高和表面氟化有关;同时,当载Pt量仅为0.02%(质量分数)时,该催化剂也显示了相当高的可见光制氢活性。

TiO_2 nanosheets with preferential(001)facets were prepared by a hydrothermal route using tetrabutyl titanate and HF as materials.Pt was loaded on TiO_2 samples by aphotodeposition method.A dye-sensitization photocatalyst was prepared by impregnation method with Eosin Y and the platinized TiO_2 samples.The prepared samples were characterized by Scanning electron microscope(SEM),Transmission electron microscope(TEM),X-ray diffractometer(XRD),UV-Vis diffuse reflectance spectra(DRS),Brunauer-Emmett-Teller(BET),Photoluminescence spectra(PL)and Fourier transform-infrared(FT-IR).The experiments show that the volume of HF and Pt loading content have remarkable effects on the rate of photocatalytic hydrogen production at the given concentration of Eosin Y.When the volume of added HF was 3mL,the activity of the prepared Eosin Y-Pt-TiO_2 nanosheets reaches a maximum which was 2.1 times as high as that of TiO_2 nanoparticles.The high percentage of(001)and surface fluorination of TiO_2 nanosheets can be responsible for the improved photocatalytic activity.When the loading Pt content was only 0.02wt%,the Eosin Y-Pt-TiO_2 nanosheets can also exhibit higher photocatalytic activity of hydrogen production.