磁性Fe_3O_4微球的溶剂热法合成及光芬顿性能优化

Solvothermal synthesis of magnetic Fe_3O_4 nanospheres and the optimization of the photo-Fenton reaction performance

为探究Fe_3O_4微球的光芬顿性能,在200℃条件下,利用溶剂热法成功制备出具有较好分散性、平均粒径(200±0.5)nm的Fe_3O_4微球,并通过对其原料配比的探究进行样品优化.该合成方法所制备出的Fe_3O_4微球在Photo-Fenton降解亚甲基蓝方面有优秀的性能,降解率达95%甚至以上.此外,Fe_3O_4微球具有易回收的优点,仅利用磁场即可将其分离,且回收率超过85%甚至90%.利用回收后的Fe_3O_4微球探究其重复利用率,结果表明,重复利用过程中样品催化降解效率与第一次使用时几乎相同.本研究探究了该样品降解亚甲基蓝的最佳反应条件,其中当反应体系中加入15 mL过氧化氢且为酸性环境下降解效率达到最大.

In order to study photo-Fenton performance of Fe3 O4 nanospheres, monodispersed Fe3 O4 nanospheres with a mean diameter of 200 nm were successfully synthesized by a solvothermal method at 200 ℃. As-synthesized Fe3 O4 nanospheres show excellent photo-Fenton efficiency on the degradation of methylene blue （ MB ） , and the degradation rate was over 95%. Besides, the catalyst was easy to recycle with only a piece of magnet, and the recovery rate can be more than 85%. Moreover, the catalyst can be regenerated with the ultrasonic treatment, and the degradation performance almost remains unchanged. In addition, the degradation efficiency varies with the amount of hydrogen peroxide applied and the pH value of the reaction system. After intensive investigation, the reaction efficiency performs best with 15 mL hydrogen peroxide added in acid atmosphere.