超声法制备Au/Fe3O4及其催化还原4-硝基苯酚性能

摘要

The Au/Fe3O4 catalyst was successfully prepared by the simple ultrasonic method and in-situ reduction method.Au was immobilized on the surface of Fe3O4 using APTES as an organic bridging bond to obtain monodisperse magnetic Au/Fe3O4.Au0 could not agglomerated in the condition of NH3+,so that it had high catalytic activity and stability.The results of XRD,HRTEM,EDS and XPS showed that Au/Fe3O4 has been prepared successfully.It was used to catalyze the reduction of 4-nitrophenols to 4-aminophenols,which showed high catalytic activity with rate constant of 0.225 6 min-1.The repeatability test showed that the catalyst had good stability.After 9 cycles of reaction,the conversion rate of the reaction was still 94％.%通过简易的超声法以及原位还原法成功制备出了负载型可再生Au/Fe3O4催化剂.利用3-氨丙基三乙氧基硅烷(AWES)作为有机桥键,将Au固定在Fe3O4的表面,得到单分散磁性Au/Fe3O4.Au0在氨基的作用下不会团聚,因此具有较高的催化活性及稳定性.XRD、HRTEM 、EDS和XPS等测试结果表明Au/Fe3O4已被成功制备.将其用于催化还原4-硝基苯酚得到4-氨基苯酚,表现出较高的催化活性,速率常数可达0.225 6 min-1.重复性实验表明该催化剂具有良好的稳定性,反应9个循环之后,催化还原反应的转化率仍可达到94％.