| Pt/SrZr0.95Y0.05O3-TiO2-xNx复合催化剂的制备及模拟太阳光催化产氢活性研究 |
| Preparation and Photocatalytic Activity for H2 Production over Pt/SrZr0.95Y0.05O3-TiO2-xNx Composite Catalyst under Simulated Sunlight Irradiation |
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| 摘要: 利用共沉淀法和固相法制备出SrZr0.95Y0.05O3微粒，采用溶胶包覆法使其与含氮TiO2溶胶复合，并原位光沉积Pt颗粒组装成异质结复合催化剂，采用XRD、TG-DTA、紫外可见漫反射光谱(UV-Vis DRS)和荧光光谱(FS)等技术对其进行了表征和分析，以草酸为牺牲剂，模拟太阳光下光催化产氢为探针，评价了催化剂的光催化活性。研究了不同氮源剂、烧结温度、载铂含量对催化剂光催化产氢活性的影响。结果表明，在模拟太阳光照射下，单独的SrZr0.95Y0.05O3和TiO2几乎不产生氢气；而将两者采用溶胶包覆法复合并掺氮后，所制备出的复合催化剂表现出一定程度的产氢活性，在氮源剂为三乙胺、400 ℃焙烧下具有最佳的产氢活性，催化活性的提高源于复合催化剂中形成的异质结抑制了光生载流子的快速复合以及氮掺杂引起对可见光的响应；进一步负载铂后，其产氢量得到大幅度的提高，其最佳负载量为1wt%，6 h内产氢量达到12.5 mmol，是未负载的样品的22倍多，这是由于铂负载进一步抑制了光生载流子的复合，从而大大地提高了光催化活性。 |
| 关键词: Pt/SrZr0.95Y0.05O3-TiO2-xNx 异质结 光催化 模拟太阳光 产氢 |
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| Abstract: SrZr0.95Y0.05O3 particles were prepared by co-precipitation and solid phase method with TiO2 sol having nitrogen containing source reagent. Pt particles were further deposited by in situ photoreduction method to prepare heterojunction composite catalysts. These obtained composite particles were characterized by XRD, TG-DTA, UV-Vis DRS and Fluorescence spectroscopy techniques. The photocatalytic hydrogen production from oxalic acid solution was used as a probe reaction to evaluate the photocatalytic activity of the composite catalysts under simulated sunlight irradiation. The effect of different nitrogen source reagents, calcination temperature and the Pt loading on the photocatalytic hydrogen production activity of catalysts was discussed. The results indicate that a small amount of hydrogen is evolved for single SrZr0.95Y0.05O3 and TiO2 under simulated sunlight irradiation. The composite catalyst prepared by the combination of SrZr0.95Y0.05O3 and TiO2 by sol-gel method and doping nitrogen shows good activity for hydrogen production, and it demonstrates the optimized photocatalytic activity of hydrogen production when the nitrogen source reagent is triethamine and calcination temperature is 400 ℃. After further depositing metal Pt, the photocatalytic activity of hydrogen production is greatly improved, and the amount of hydrogen is up to 12.5 mmol within 6 h when the optimized loading is 2wt%, which is 22 times more than that of samples without Pt. Loading metal Pt further inhibits the combination of photo-generated carriers, and therefore the photocatalytic activity is greatly improved. |
| Keywords: Pt/SrZr0.95Y0.05O3-TiO2-xNx heterojunction photocatalytic simulated sunlight hydrogen production |
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| 阎建辉,朱裔荣,唐有根,杨海华.Pt/SrZr0.95Y0.05O3-TiO2-xNx复合催化剂的制备及模拟太阳光催化产氢活性研究[J].无机化学学报,2008,24(5):791-796. |
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