基于水热法制备的TiO2/MoS2复合光催化剂及其光催化制氢活性
Development of TiO2/MoS2 by hydrothermal method for photocatalytic hydrogen generation under solar light
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摘要: 采用水热法制备出了TiO2/MoS2复合光催化剂,通过X射线衍射(XRD)、透射电镜(TEM)、紫外可见漫反射光谱(DRS)、X射线光电子能谱分析(XPS)和光致发光光谱(PL)方法对TiO2/MoS2 进行表征.研究了MoS2负载量、复合催化剂TiO2/MoS2表面担载的贵金属种类(Pt、Pd、Ru)及其担载量、空穴牺牲剂种类对光催化反应制氢活性的影响,并考察了催化剂的稳定性.研究结果表明,硫化钼和二氧化钛复合能显著提高光催化产氢性能,硫化钼的最佳负载量为5 wt%,比产氢速率为776.99 μmol·h-1·g-1,其产氢活性是纯TiO2的4.92倍,商业P25 的3.67倍;复合催化剂TiO2/5 wt% MoS2表面担载的贵金属种类及其质量分数对产氢性能有一定的影响,其中0.5 wt%的Pd对产氢性能的影响最大,能明显提高复合催化剂的产氢性能,比产氢速率可提高至2599 μmol·h-1·g-1;该催化剂可利用不同有机物作为牺牲剂产氢,如甲醇、乙醇和乳酸,三者产氢量的次序为:甲醇>乳酸>乙醇;经过5次循环实验,复合催化剂Pd/(TiO2/MoS2)仍能保持90%的活性. 另外,对复合催化剂光催化产氢机理也进行了分析.Abstract: TiO2/MoS2 composite was synthesized by a hydrothermal method. The samples were characterized by X-ray diffraction, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy, XPS and photoluminescence spectroscopy. the photocatalytic activity of TiO2/MoS2 composite was evaluated by varying the MoS2 content, types of noble mental deposition (such as Pt, Pd, Ru), and types of sacrificial agents. The stability of the catalyst was also investigated. The results suggested that the appropriate content of MoS2 in TiO2/MoS2 is 5 wt% and the corresponding specific H2 production rate was 776.99 μmol·h-1·g-1, which was 4.92 times and 3.67 times that of TiO2 and commercial P25 respectively. By loading 0.5 wt% Pd on the TiO2/5 wt% MoS2, the highest specific hydrogen production rate of 2599 μmol·h-1·g-1 was achieved in 25 vol% methanol solution. The composite catalyst Pd/(TiO2/MoS2) could produce hydrogen with different electron donors such as methanol, ethanol and lactic acid, and the hydrogen production rate follows the order of methanol > lactic acid > ethanol. After 5 cycles of stability test, the hydrogen production rate of Pd/(TiO2/MoS2) preserved 90%. In addition, the mechanism of composite catalyst was also proposed.
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Key words:
- hydrothermal method /
- photocatalysis /
- molybdenum sulfide /
- hydrogen production
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