Magnetic Mn-Doped Fe3O4 hollow Microsphere/RGO heterogeneous Photo-Fenton Catalyst for high efficiency degradation of organic pollutant at neutral pH

Development of high-efficiency, low-cost and environmentally friend catalyst for degradation of organic pollutant in water is still a challenge issue. In this research, we prepared a novel Mn-doped Fe3O4 magnetic hollow microsphere/reduced oxide graphene (RGO) hybrid (Mn-Fe3O4/RGO) by a facile solvothermal process followed by a reduction of GO via NaBH4. The as-prepared Mn-Fe3O4/RGO is used as a heterogeneous Photo-Fenton catalyst for degrading Rhodamine B (RhB) and exhibits high efficiency degradation about 96.4% with the low dosage concentration of catalyst 0.2 g L-1 in the presence of H2O2 at the natural pH (similar to 6.5) within 80 min under UV-vis illumination, while the removal efficiency is 91% and 85% at pH 2 and 11, respectively. Furthermore, this novel magnetic Photo-Fenton catalyst remains high degradation efficiency of about 90% after ten cycles and can be easily separated from the solution via an external magnetic field, showing an excellent recyclability, a long-term chemical stability and a great potential for practical wastewater treatment application.