Cu-Fe-TiO_2/膨润土复合光催化剂的表征及性能

Characterization and Property of Cu-Fe-TiO_2/Bentonite Composite Photocatalyst

以膨润土为载体,用溶胶-凝胶法制备了不同焙烧温度的Cu-Fe双金属掺杂的TiO2/膨润土复合光催化剂,采用XRD、TG-DSC和N2吸附技术对其结构进行了表征,通过光催化降解直接天蓝染料废水,考察了焙烧温度对催化剂光催化性能的影响。结果表明,当焙烧温度高于300℃时,催化剂中出现了锐钛矿型TiO2,掺杂的Cu2+、Fe3+可能进入了TiO2晶格取代了部分Ti4+,使其晶格产生了一定程度的畸变,形成了复合半导体,拓宽了TiO2的光谱响应范围,并且Cu2+、Fe3+掺杂的TiO2复合半导体进入了蒙脱石层间,与膨润土成功复合,增大了催化剂的比表面积并改善了催化剂的孔体积,提高了光催化剂活性和再生性。

Cu-Fe-TiO2/bentonite composite photocatalysts were prepared by sol-gel method. XRD,TG-DSC and N2 ads0rption-desorption techniques were employed to characterize the structure of the samples. Using the degradation of direct sky blue dye wastewater as a model, the effect of calcination temperature on the photocatalytic properties of the photocatalyst was investigated. The results show that the anatase TiO2 was formed in the photocatalysts after treated with heat at the temperature higher than 300℃. Cu2＋ and Fe3＋ might incorporate into the lattice structure of TiOz and partially replace Tie＋, thus causing the defects in the crystal structure and the broadening of the spectral response range of TiO2. Moreover, specific surface area and the pore volume of the photocatalysts were improved because of the permeating of Cu-Fe co-doped TiO2 into the interlayer of montmorillonite, and the composition of TiOz with bentonite was testified, then the photocatalytic activity and regeneration capability were improved.