中文摘要：

采用微波辅助溶胶-凝胶法制备了 Yb,N 共掺杂的纳米（Yb,N）-TiO2光催化剂,通过 XRD、XPS、UV-Vis-DRS、PL 等对（Yb,N）-TiO 2样品进行了表征和分析,并以亚甲基蓝（MB）作为目标降解物,考察了不同 Yb 掺杂浓度的（Yb,N）-TiO2对 MB 的光催化降解效果.结果表明,Yb 和 N 的掺入减小了 TiO2的禁带宽度,降低了光生电子-空穴对的复合,使其吸收光谱的阈值波长红移至可见光区,提高了 TiO 2的光催化活性.当 pH 值＝1．5、m （H2 NCONH2）＝10g、热处理温度为650℃、n （Yb）∶n （Ti）＝0．005时,（Yb,N）-TiO 2粉体在普通日光灯下对亚甲基蓝在5 h 内的光催化降解效率达93．55％,明显高于同等条件下 P25的降解率45．72％.

英文摘要：

Ytterbium and nitrogen co-doped TiO2 photocatalysts which could degrade methyl blue （MB）under visible light irradiation were prepared by sol-gel method combined with microwave chemical synthesis.Samples were characterized by XRD,XPS,UV-Vis-DRS and PL.The results show that Yb,N co-doped narrowed the band gap and inhibited the recombination of photogenerated electron-hole pairs.The band-gap energy absorption edge shifted to longer wavelength,thus the photocatalytic activity is improved.Results of degradation revealed that the （Yb,N）-TiO2 has shown much more photocatalytic activity than the P25 when the preparation condi-tion is as follows：sintered temperature T =650 ℃,pH=1.5,m （H2 NCONH2 ）=10 g,n （Yb）∶n （Ti）=0.005.