钴掺杂纳米TiO_2的光电催化活性研究

Photoelectrocatalytic activity of Co-doped nanometer TiO_2

通过水热法制备Co掺杂纳米TiO_2,采用SEM、粒径分布仪、XRD、XPS、BET等对钴掺杂纳米TiO_2样品进行了表征。在电化学工作站上,以压片法制备的光催化剂为阳极,石墨片为阴极,在低功率的紫外灯和可见光灯下通以1.5 V恒电压光电降解罗丹明B 90 min,研究了不同物质的量比的Co-TiO_2的光电催化活性。通过实验研究发现:样品0.5%Co-TiO_2在紫外灯照射下的降解率最高,为77.25%,比纯TiO_2的降解率高12.53%;样品0.5%CoTiO_2在可见光照射下的降解率达52.22%,比无光照时的降解率高17.15%。以上研究结果表明以压片法制备的催化剂阳极可较大程度地提高光催化降解效率,且稳定性较高,具有很好的发展前景。

Co-TiO2 photocatalysts have been prepared by a hydrothermal method. The photocatalysts were characterized by SEM,laser particle size analysis,XRD,XPS,BET,and UV-vis. On an electrochemical workstation,a two-electrode system was used with the Co-TiO2 photocatalyst as the anode prepared by tableting,and a graphite sheet as the cathode. Under low power ultraviolet light and visible light irradiation,photoelectrocatalytic reactions were performed at a constant potential of 1. 5 V for 90 min. The photoelectrocatalytic activities of the photocatalysts with different molar ratios of Co∶ Ti were studied. The results show that the 0. 5% Co-TiO2 sample had the highest degradation ratio,77. 25%,which was 12. 53% higher than that of the pure TiO2 sample. The degradation ratio of 0. 5% Co-TiO2 with visible light was 52. 22%,which was 17. 15% higher than the 0. 5% Co-TiO2 sample in the dark. The results also showed that preparing the anodes by tabletting affords improved photodegradation efficiency,and high stability,and the new catalysts have favorable development prospects.