Fe/CeO_2 Catalysts for Highly Efficient Degradation of Congo Red at Low Temperature
- 化学化工－已发表论文 
[中文摘要]有机染料废水成为目前世界公认的主要工业污染源之一,对有机染料的降解越来越引起人们的重视.采用溶胶-凝胶法(sol-gel)和浸渍法制备掺杂Fe的催化剂Fe/CeO2,以X-射线衍射(XRD)和N2物理吸附-脱附对催化剂的结构进行了表征,并对其催化降解有机染料刚果红的性能进行了研究.结果表明,在CeO2中添加过渡金属Fe未改变CeO2晶相结构,且Fe物种在CeO2上处于高分散状态.采用催化湿式过氧化氢氧化法(CWPO)处理10 mg/L偶氮染料刚果红,在低温(5~35℃)范围内,质量分数为2.0%Fe/CeO2催化剂均能表现出高的催化活性.室温25℃时,当催化剂和氧化剂(质量分数为30%H2O2)投加量分别为0.05 g和0.02 mol/L,处理40 min后刚果红降解率可达96%.同时,催化剂重复性实验结果表明催化剂具有良好的稳定性.[英文摘要]Currently,the organic dyes are the one of main industrial pollutants.The degradation of dyes has been paid increasing attention.In this paper,Fe/CeO2 catalysts were prepared by sol-gel and impregnation method and the catalytic degradation properties toward Congo red were investigated.The structures of catalysts were characterized by X-ray diffraction(XRD) and N2 adsorption-desorption.The results of characterizations show that the crystalline structure of CeO2 is unchanged by addition of transition metal Fe into CeO2 and Fe species display highly disper sed state. In the range of 5℃ to 35℃,the 2.0%(by mass) Fe/ CeO2 catalyst for degradation of 10mg/L azo dyes Congo red by catalytic wet hydro gen per oxide oxidation (CWPO) demo nstr ates highly catalytic activity. Furthermore, at room temper ature(25℃),the degradation percentage of Congo red is 96% with the amount of 0.05 g catalyst and 0.02mol/L H2O2(30%(by mass)) after reacting 40 min. At the same time,the repetitive experimental results of catalyst have shown that the catalyst displays excellent stability.