TiO_2∶Fe的EPR谱及其光催化特性研究  

Study on EPR Spectra and Photocatalytic Properties of TiO_2∶ Fe

作　　者：殷春浩[1] 李少波[1] 吴彩平[1] 徐振坤[1] 神干[1] 李佩欣[1] 

机构地区：[1]中国矿业大学理学院,徐州221116

出　　处：《人工晶体学报》2014年第8期2062-2069,共8页Journal of Synthetic Crystals

摘　　要：采用溶胶-凝胶法制备了TiO2∶Fe材料,测试并分析了材料的电子顺磁共振谱,其结果显示溶胶凝胶法制备的Fe掺杂TiO2粉末在g=1.99和4.3处具有明显信号峰,归属于信号对应离子,并利用其积分值半定量分析了掺杂到晶体表面和内部Fe离子数目的多少及二者比值,发现对离子掺杂到内部而言直至掺杂浓度为0.6%仍未达到饱和,而对离子掺杂到表面而言,当掺杂浓度为0.4%时,该信号强度不再增强,掺杂到晶体表面的Fe离子数量达到饱和。使用紫外可见光谱仪测定了所制材料的光催化性能,所制的Fe掺杂TiO2纳米材料最佳掺杂浓度为0.1%,对甲基橙降解率是17.83%,比未掺杂材料降解率(16.31%)提高了9.32%,增强了光催化活性,其余掺杂浓度(0.0372%,0.2%,0.4%和0.6%)样品的光催化活性均比未掺杂样品的低,降低了光催化活性。Fe-doped TiO2 powder were prepared by the sol-gel method. Then the electron paramagnetic resonance of the powder were tested and analyzed. The EPR spectra indicates that there are two evident signal peaks at the g = 1. 99 and 4. 3 points in the spectrogram of the Fe-TiO2,which identifies the corresponding ion to the signal. Moreover,the number of Fe3 ＋doped into crystal surface and the inside was analyzed semi-quantitatively with the use of the integral value,and the ratio between the two numbers was calculated as well. It is found that for ion that doped into the inside,a doping concentration of 0. 6%does not reach the saturation; while for ion doped into the crystal surface,when the doping concentration reaches 0. 4%,the signal strength is no longer enhanced,which means the number of Fe3 ＋doped into the surface has now reached saturation. Photocatalytic properties of the prepared materials were tested by UV-Vis spectrometer. The best doping concentration of Fe-doped titanium dioxide was 0. 1% and the degradation rate of methyl orange was 17. 83% which increased by 9. 32% than that of undoped titanium dioxide（16. 31%）,indicating that the photocatalysis activity of titanium dioxide was strengthened; while the photocatalysis activity of samples with other concentrations（0. 0372%,0. 2%,0. 4% and 0. 6%）are lower than that of the undoped ones.

关 键 词：溶胶-凝胶法 二氧化钛 电子顺磁共振 光催化 

分 类 号：O482.5[理学—固体物理] O643[理学—物理]