几种制备方法的掺铁二氧化钛光催化特性

二氧化钛作为一种半导体光催化剂 ,在太阳能转换和储存 ,二氧化碳还原 ,有害复杂有机物降解等方面都引起了广泛的研究兴趣 .然而 ,二氧化钛悬浮降解体系的光催化活性却受到诸多因素的影响和制约 .有不少研究者从体系的晶体结构和表面物化性质 ,如晶相（锐钛矿 ,金红石 ,无定形）、比表面积、晶粒尺寸和表面羟基的角度讨论光催化活性 [1,2].近来有很多人希望通过掺杂方法来提高二氧化钛的光催化活性或者通过表面修饰的手法延伸光响应范围 .Kakuta、 Anderson、 Papp[3,4]等研究了复合氧化物如 TiO_2/Al2O3、 TiO_2/SiO2、 TiO_2/ZrO2、…

Photocatalytic Activity of Iron Doping TiO_2 Prepared by Several Methods

The iron doping titanium dioxide was prepared by sol gel,step precipitation,co precipitation and immersion methods,respectively.The photocatalytic activities of these prepared samples were evaluated in X 3B dispersion irradiated under UV.The experimental results showed that the immersion method,especially using the nano TiO2 as immersion matrix,greatly enhanced the photocatalytic activity.One fold enhancement in photocatalytic activity was observed in the case of the sample prepared by immersion doping method.This may be attributed to the nano size effect,the irreversible hole trapper in non saturated bonding field of Fe3＋ and larger lattice strain.