油性金属-半导体异质结构可见光催化特性及在水处理中的应用研究

Visible Light Catalysis and Application in Water Treatment Using Oil Soluble Metal-Semiconductor Composite Nanostructures

利用金属等离激元热电子效应,使突破半导体带隙宽度限制的可见光催化成为可能,是有机污染物处理方面的新兴方向。首先制备了油性Ag-TiO 2纳米棒异质结构,研究了其光谱特性及催化过程中热电子转换机制,验证了在可见光下对水中有机染料的高效催化分解能力。结果表明,相比于TiO 2纳米棒,Ag-TiO 2纳米棒异质结构展现出显著的催化能力,罗丹明B的分解速率提高了近三倍。这种催化材料高效、环保,在水中不残留,在水处理等领域具有广泛的应用前景。

The effect of plasmon-induced hot-electron transfer enables the possibility of applying semiconductors with wide band gap to visible light catalysis,which becomes an emerging research direction in organic pollutants treatment.Here oil soluble Ag-TiO 2 nanorod composites were prepared.Their optical spectral response range and relative hot-electron transport mechanism in catalytic process were studied.Their visible light catalytic ability in water was experimentally investigated.The experimental result showed that the photocatalytic ability of Ag-TiO 2 composite nanostructures was much more notable compared with TiO 2 nanorod.The decomposition rate of Rhodamine B was increased up to nearly three times by the assist of Ag-TiO 2 composite nanostructures.No residue in water,high efficiency and environment-friendly properties make this photocatalyst suitable for water treatment application.