20.500.12556/RUL-175291 Bimetallic CoMn$_2$O$_4$ spinel as an effective catalyst for peroxymonosulfate activation toward perfluorooctanoic acid degradation The widespread occurrence of perfluorooctanoic acid (PFOA) and its detrimental environmental impacts have become a major focus of global attention. This study focused on the synthesis of bimetallic CoMn$_2$O$_4$ spinel by using the simple precipitation method followed by calcination at 550 °C. The peroxymonosulfate (PMS, HSO$_5^−$) activation efficiency of as-synthesized catalyst has been investigated for PFOA degradation in PMS activated CoMn$_2$O$_4$ catalytic system. Factors affecting the degradation efficiency were systematically examined. Under the optimal conditions (PMS concentration of 0.4 mM, catalyst dosage 0.2 g L$^{−1}$, and pH 5), the removal rate of PFOA (0.024 mM) was reached ∼ 90 % with a defluorination rate of 44 % after 180 mins at 30 °C. Bimetallic CoMn$_2$O$_4$ spinel oxide exhibited much better catalytic activity than single metal oxide of Mn and Co due to the formation of redox cycles between ≡Mn$^{2+}$/≡Mn$^{3+}$/≡Mn$^{4+}$ and ≡Co$^{3+}$/≡Co$^{2+}$ and their synergistic interaction between Mn and Co species confirmed by various characterization techniques. The radical scavenger tests and electron paramagnetic resonance (EPR) results testified that $^•$OH and SO$_4^{•−}$ were the main reactive oxidation species (ROS) for the stepwise removal of PFOA. Additionally, five experimental runs were performed to prove the higher stability, reusability and superb performance with extremely low metal leaching. A marginal reduction in the removal of used catalysts was detected during four cycles. Overall, unique structural features of CoMn$_2$O$_4$/PMS system confirmed the excellent catalytic performance in the remediation of emerging pollutants. perfluorooctanoic acid peroxymonosulfate bimetallic cobalt manganate spinel decomposition and defluorination reusability and stability degradation mechanism PFOA PMS perfluorooktanojska kislina PFOA peroksimonosulfat PMS bimetalni kobaltov manganat spinel razgradnja in defluoriranje ponovna uporabnost in stabilnost mehanizem razgradnje true false true Angleški jezik Slovenski jezik Članek v reviji 2025-10-23 13:22:19 2025-10-23 13:22:20 2026-06-17 04:10:52 0000-00-00 00:00:00 2026 0 0 13 str. pt. A, art. 122792 Vol. 321 1 Feb. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 546.7:544.478 0009-2509 10.1016/j.ces.2025.122792 254473219 1-s2.0-S0009250925016136-main.pdf 1-s2.0-S0009250925016136-main.pdf 1 5F9CC65889DFA864A3B34E2CC8D8C303 177c9748919bb641b2cac33da353d915d9105d466bb2f4d5738858214f6aafc3 13a31c03-6978-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=235736 https://www.sciencedirect.com/science/article/pii/S0009250925016136 1 411d7dc9-b002-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=220730 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0