纳米尖晶石CuFexCo2-xO4的制备及其在对硝基苯酚催化还原中的应用

Preparation of nano spinel CuFe_xCo_(2-x)O_4 and its application in nitrophenol catalytic reduction

目前,水质污染特别是对硝基苯酚造成的水质污染正受到越来越多的重视和关注。为了解决这一问题,提出了一种催化还原对硝基苯酚转化为对氨基苯酚的方法,而还原过程中一般都需要活性高、易回收的催化剂。本文采用凝胶-燃烧法制备了一系列易回收的CuFe_xCo_(2-x)O_4纳米尖晶石催化剂(CuFe_2O_4、CuFeCoO_4和CuCo_2O_4),并系统探究了催化剂在对硝基苯酚催化还原中的催化活性。XRD表征表明,催化剂CuFe_2O_4、CuFeCoO_4、CuCo_2O_4属于尖晶石结构。通过扫描电镜对比了纳米尖晶石催化剂CuFe_2O_4、CuFeCoO_4、CuCo_2O_4的微观形貌,相对于催化剂CuFe_2O_4、CuFeCoO_4,纳米尖晶石CuCo_2O_4催化剂具有更小的粒径和分散度。催化还原对硝基苯酚的实验结果表明,相对于催化剂CuCoFeO_4和CuFe_2O_4,纳米尖晶石CuCo_2O_4催化剂在对硝基苯酚的还原中具有更高的催化活性和良好的应用前景。

Water pollution, especially caused byp-nitrophenol, has drawn more and more attention in recent years. To solve the problem, catalytic reduction ofp-nitrophenol intop-aminophenol is proposed, however, it requires catalyst of high activity and easy to recovery. Nano spinel CuFexCO2-xO4 recyclable catalysts （CuFe2O4, CuFeCoO4, CuCo2O4） are prepared via a gel-burning method, and their catalytic activities are investigated in the catalytic nitrophenol reduction XRD characterization indicates that CuFe2O4 , CuFeCoO4 and CuCo2O4 catalysts all have excellent spinel phase structure. Micro-morphologies ofnano spinel CuFe2O4, CuFeCoO4 and CuCo2O4 catalysts are checked using SEM. SEM images showed that nano spinel CUCo2O4 catalyst has smaller particle size and higher dispersions than those of CuFe2O4 and CuFeCoO4 catalysts. In the catalytic nitrophenol reduction, nano spinel CuCo2O4 catalyst exhibits much higher catalytic activity than CuFe2O4 and CuFeCoO4 catalysts.