Mn-doped Fe2O3/diatomite granular composite as an efficient Fenton catalyst for rapid degradation of an organic dye in solution

This investigation reports the synthesis and evaluation of a novel and improved diatomite modified with Fe-Mn binary oxide (DT-FeMn) Fenton catalysis for photochemical reactions in aqueous media. The catalyst was prepared by a co-precipitation process and found to be highly efficient for the photocatalytic degradation Rhodamine B (RhB). In comparison with the iron trioxide coating on diatomite (DT-Fe), the nanoparticles on the surface of the DT-FeMn contained multiple active sites. Experimental results indicated that there was a synergy between the Fe and Mn in the Fe-Mn binary oxide, which was the most important factor for the improved catalytic oxidation performance. The stability and reusability of the composite coating of the catalyst were also investigated by comparing the photocatalytic performance and the loss of Fe3+ ions. It was found that the synergy between the components of the Fe-Mn binary oxide coating enhanced the stability of Fe3+ ions, which prevented the loss of the Fe3+ ions. A maximum of 99.1% RhB was degraded after 80 min. This work might provide a novel Fenton material for pollutants removal in the presence of H2O2 to alleviate environmental pollution. Diatomite-based DT-FeMn composites synthesized via one step co-precipitation and then structurally characterized. Under tungsten filament lamp irradiation, the hybrid materials showed much higher photo-Fenton catalytic activity for the RhB degradation than that of the single Fe2O3 coated, and a reasonable synergy mechanism between Fe2O3 and MnO2 was proposed.

Automated summary

The study demonstrates that the diatomite modified with Fe-Mn binary oxide is an efficient photocatalytic material for degrading dye wastewater, with the synergy between Fe and Mn being the key factor in enhancing catalytic performance.