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Trimethoprim (TMP), a typical antibiotic pharmaceutical, has received extensive attention due to its potential biotoxicity. In this study, CuFe 2 O 4 , which was used to decorate MWCNTs via a sol-gel combustion synthesis method, was introduced to generate powerful radicals from peroxymonosulfate (PMS) for TMP degradation in an aqueous solution. The results showed that almost 90% of TMP was degraded within 24 min with the addition of 0.6 mM PMS and 0.2 g L -1 CuFe 2 O 4 /MWCNTs. The degradation rate was enhanced with the increase in initial PMS doses, catalyst loading and pH. A fairly low leaching of Cu and Fe was observed during the reaction, indicating the high potential recyclability and stability of CuFe 2 O 4 /MWCNTs. Electron paramagnetic resonance analysis confirmed that the CuFe 2 O 4 /MWCNT-PMS system had the capacity to generate ·OH and SO 4 ˙ - , whereas quenching experiments further confirmed that the catalytic reaction was dominated by SO 4 ˙ - . A total of 11 intermediate products of TMP was detected via mass spectrometry, and different transformation pathways were further proposed. Overall, this study showed a systematic evaluation regarding the degradation process of TMP by the CuFe 2 O 4 /MWCNT-PMS system.

rsc advances

Sulfate radical-induced transformation of trimethoprim with CuFe<sub>2</sub>O<sub>4</sub>/MWCNTs as a heterogeneous catalyst of peroxymonosulfate: mechanisms and reaction pathways

Sulfate radical-induced transformation of trimethoprim with CuFe2O4/MWCNTs as a heterogeneous catalyst of peroxymonosulfate: mechanisms and reaction pathways

Sulfate radical-induced transformation of trimethoprim with CuFe₂O₄/MWCNTs as a heterogeneous catalyst of peroxymonosulfate: mechanisms and reaction pathways