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采用溶胶-凝胶法制备了不掺、单掺和共掺杂纳米TiO2,对样品进行了XRD和UV-Vis吸收光谱分析,并以甲基橙的光脱色反应考察了样品的光催化性能。结果发现V5+拓宽了TiO2光谱响应范围,提高了光的利用率,产生更多的电子-空穴对;Ho3+的掺杂抑制了TiO2粒径的长大,引起了晶格的畸变和膨胀,延缓了光生载流子的复合;V5+、Ho3+共掺杂时,由于两种掺杂物的共同作用,可进一步提高TiO2的光催化性能。
The undoped, single-doped and co-doped nano-TiO2 were prepared by sol-gel method. The samples were analyzed by XRD and UV-Vis absorption spectra. The photocatalytic properties of the samples were investigated by light decolorization of methyl orange. The results showed that V5 + broadens the spectral response range of TiO2 and improves the utilization of light, resulting in more electron-hole pairs. The doping of Ho3 + inhibits the growth of TiO2 particle size and causes the lattice distortion and expansion, The photocarriers of the composite; V5 +, Ho3 + co-doped, due to the combination of two dopants can further improve the photocatalytic properties of TiO2.