Magnetically recyclable MXene derived N-doped TiO2@C@Fe3O4 nanosheets for enhanced degradation of organic pollutants via photo-Fenton

We synthesized the magnetic recyclable Ti3C2 derived N-TiO2@[email protected]3O4 for photo-Fenton degradation of organic pollutants through high-temperature calcination and solvothermal methods. Ti3C2 was first calcined into TiO2@C with a homogeneous titanium source and a two-dimensional carbon framework. Then the magnetic nanoparticles (Fe3O4) were loaded by solvothermal method, which effectively solved the problem of repeated circulation of powder catalysts. N-TiO2@[email protected]3O4 could be used as an excellent co-catalyst to improve the decomposition efficiency of H2O2 in advanced oxidation processes (AOPs). This significantly reduced the amount of H2O2 and Fe2+ in the photo-Fenton system. The N-TiO2@[email protected]3O4 photo-Fenton system could degrade 96.5% of Rhodamine B (RhB) within 300 s and maintain a recycling rate of more than 90% after 10 cycles. This system also had favorable applicability to the same wastewater of antibiotics. This mechanism was proposed that the N-TiO2@[email protected]3O4 photo-Fenton system activated H2O2 to generate hydroxyl radicals (·OH) and superoxide radicals (·O2−) to further attack RhB. This research provided novel insights for the photo-Fenton collaborative catalytic system to achieve advanced oxidation treatment of pollutants in the water environment.