金属共掺杂对TiO2光催化性能的影响

采用sol—gel法制备了Fe^3 -Ce^4 、La^3 --Ce^4 共掺杂TiO2光催化剂，以对水溶液中Rhodamine B的降解考察其光催化活性。XRD结果表明，制备的催化剂为锐钛矿型。共掺杂催化剂的光活性均高于单掺杂催化剂，La^3 -Ce^4 共掺杂TiO2光催化剂光活性高于Fe^3 -Ce^4 共掺杂TiO2光催化剂。荧光光谱(PL)结果表明，La^3 -Ce^4 共掺杂TiO2光催化剂有较弱的荧光强度，说明光催化活性与荧光强度具有负相关性。

Influence of Codoping of Metals on the Photo-Catalytic Activity of TiO2

Titanium dioxide photo-catalysts co-doped with Fe~3+ -Ce~4+ and La~3+-Ce~4+ by using the sol-gel method were prepared to evaluate the photo-catalytic activities of its degradation of Rhodamine B in solution. The results of XRD showed that the crystal's structure is the type of anatase. The photo-catalytic activity of the catalyst co-doped by metal is higher than that of single-doped, especially, the activity of TiO_2 co-doped La~3+ and Ce~4+ is higher than that of TiO_2 co-doped Fe~3+ and Ce~4+. The result of PL shows that the PL intensity of TiO_2 co-doped La~3+ and Ce~4+ is weaker than that of TiO_2 co-doped Fe~3+ and Ce~4+ It indicates that the photo-catalytic activity has negative correlativity with PL intensity.