层状CuyFe6-yAl2Ox催化剂的制备及其在罗丹明B降解反应中的应用

Synthesis and Application in Degradation of Rhodamine B of Layered CuyFe6-yAl2Ox Catalysts

以铜铁铝水滑石为前驱体,经焙烧后得到了一系列不同组成的层状铜铁铝混合氧化物催化剂。将其应用于中性条件下高浓度罗丹明B(450 mg·L^-1)的类芬顿降解反应中,考察了催化剂中铜铁比例及焙烧温度对其降解性能的影响。实验结果表明,当铜铁物质的量之比为5∶1、焙烧温度为500℃时所得到的Cu5FeAl2Ox-500催化剂对罗丹明B的降解效率最高,能够在150 min内将罗丹明B完全降解。表征结果发现,Cu5FeAl2Ox-500催化剂中生成了新的CuFe2O4物相,而且具有较大的比表面积和介孔体积,因而有利于罗丹明B的降解。同时还发现该催化剂对多种污染物的降解均有很好的效果。

A series of layered CuyFe6-yAl2Ox catalysts were prepared via the controlled calcination of CuyFe6-yAl2-LDH and applied in the Fenton degradation reaction of high concentrated rhodamine B(RhB,450 mg·L^-1)under neutral conditions at room temperature.It was found that Cu5FeAl2Ox-500,which was prepared at a calcination temperature of 500℃,was most active for the degradation RhB.Over Cu5FeAl2Ox-500 catalyst(with 0.1%(w/w)loading),RhB could be completely degraded within 150 min,and the chemical oxygen demand(COD)removal efficiency reached 86.5%.The characterizations indicated that both Cu and Fe have a good synergistic effect for the degradation reaction as the formation of CuFe2O4.At the same time,the catalyst with larger specific surface area and bigger pore volume was also favorable for the degradation of RhB and COD removal.It was also confirmed that Cu5FeAl2Ox-500 catalyst was capable for the degradation of a variety of pollutants.