In order to further enhance the activation performance of peroxymonosulfate (PMS) an efficient and recyclable magnetic recyclable catalyst was successfully fabricated by co-precipitation and hydrothermal methods. We designed commercial hexagonal sheet boron nitride (C-BN) and boron nitrogen micro-nanotubes (BNMTs) to anchor CoFe2O4 nanoparticles (C-BN@CoFe2O4/BNMTs@CoFe2O4). Compared with the smooth hexagonal C-BN, the abundant pores and oxygen-containing groups of BNMTs could effectively increase the loading of CoFe2O4 and enrich the active sites. Under optimal conditions, the BNMTs@CoFe2O4/PMS system could rapidly and efficiently degrade 92.7% of oxytetracycline (OTC) within 5 min. In addition, the strong binding force between BNMTs and CoFe2O4 enabled favorable regeneration efficiency after 5 cycles (87.6%). This mechanism was proposed to activate PMS by BNMTs@CoFe2O4 to generate sulfate free radicals (SO4•-) and hydroxyl free radicals (·OH) to further attack OTC. Our survey results were expected to provide new insights for the rational design and application of boron nitride-based materials and transition metal/PMS systems for environmental remediation.

We proposed a new peroxymonosulfate (PMS) activator that the dispersed CoMn2O4 nanoparticles embedded in nitrogen-doped reduced graphene oxide aerogel (CoMn2O4@N-rGA) with interlinked three-dimensional network via hydrothermal method for oxytetracycline (OTC) degradation. CoMn2O4@N-rGA and PMS (CoMn2O4@N-rGA/PMS) exhibited a high degradation rate of 91.3% within 20 min and a rapid catalytic degradation rate of 0.0729 min(-1). The radical pathway system had excellent effects on OTC degradation in a wide range of pH from 3.0 to 9.0 and an outstanding catalytic activity on actual pharmaceutical wastewater. It was attributed to dispersed CoMn2O4 nanoparticles embed in nitrogen-doped reduced graphene oxide aerogel with interlinked three-dimensional network by Scanning electron microscope (SEM). The mechanism was hypothesized that PMS was activated to generate sulfate radical (SO4 center dot-) and hydroxyl radicals ((OH)-O-center dot), which could be confirmed via free radical quenching test and electron paramagnetic resonance (EPR) spectra. Finally, a flow-type setup based on the feedback mechanism with excellent effect on high concentration of OTC and actual pharmaceutical wastewater was designed for verifying the practical value of the system.