采用微波辅助溶胶-凝胶法制备了 Yb,N 共掺杂的纳米(Yb,N)-TiO 2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)-TiO 2对 MB 的光催化降解效果.结果表明,Yb 和 N 的掺入减小了 TiO 2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 (H 2 NCONH 2)＝10 g、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％.
Ytterbium and nitrogen co-doped TiO 2 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)-TiO 2 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 (H 2 NCONH 2 )=10 g,n (Yb)∶n (Ti)=0.005.
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