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采用微波辅助化学浴沉积法(MABCD)制备CdS量子点敏化SnO_2-TiO_2复合电极,并研究了不同反应条件对其光催化性能的影响。结果表明:CdS量子点敏化可将SnO_2-TiO_2复合电极的吸收范围扩展到可见光区域,其吸收边在570nm左右。研究发现,CdS-SnO_2-TiO_2复合电极阶梯式的能带结构和良好的界面接触均有助于促进光生载流子的转移,从而减少复合,提高SnO_2-TiO_2复合电极的可见光催化性能。当微波反应时间为40min时,CdS-SnO_2-TiO_2复合电极对Cr(Ⅵ)的还原率达到93%。
The CdS quantum dot sensitized SnO_2-TiO_2 composite electrode was prepared by microwave assisted chemical bath deposition (MABCD), and the effects of different reaction conditions on its photocatalytic performance were studied. The results show that CdS quantum dot sensitization can extend the absorption range of SnO_2-TiO_2 composite electrode to the visible region with absorption edge at about 570nm. It was found that the stepped band structure and good interfacial contact of CdS-SnO_2-TiO_2 composite electrode all contribute to the transfer of photo-generated carriers and thus reduce the recombination and improve the visible light photocatalytic activity of SnO_2-TiO_2 composite electrode. When the microwave reaction time is 40min, the reduction rate of Cr (Ⅵ) by CdS-SnO_2-TiO_2 electrode is 93%.