چكيده فارسي :
Organic dyes are one of the largest groups of pollutants released into wastewaters from textile and other industrial processes. Because of potential toxicity of the dyes and their visibility in surface waters, removal and degradation of organic dyes have been a matter of considerable interest. A wide range of methods have been developed, amongst which the heterogeneous catalysis cupper appears to be the most promising technology. Among these heterogeneous catalysts, magnetic nanoparticles (MNPs) have attracted much attention due to their unusual magnetic, physical, surface chemical and catalytic properties [1]. Because of interesting structural features and high levels of catalytic activity associated with these materials, their applications have extended to almost all possible fields of science ranging from medicine to rocketry and organic synthesis [2,3]. However, the specific surface area and thermal stability of pure ZrO2 is low and it shows weak catalytic activity in a number of chemical transformations. To increase the catalytic performance of zirconia-based catalysts, several procedures have been used by introducing various metals oxides, where upon zirconia acts as a support for the preparation of the solid catalysts. In this article, A novel Nano catalyst was synthesized by covalent immobilization of Captopril on the Fe3O4/ZrO2 core shell surface. In the following palladium ions grafted to hydrophilic organic fragment of modified fe3O4@ZrO2 and reduced to Cu nanoparticles by NaBH4 as a reduce reagent. The synthesized Cu nanoparticles can be employed as a magnetically recycled catalyst for the reduction of 4-nitrophenol, methylene blue and methyl orange in the presence of NaBH4 as a reducing reagent. The synthesized catalyst exhibited high catalytic activity. Moreover, synthesized catalyst could be readily recycled and reused several times without significant loss of activity.
