Abstract
In this work, novel Fe3O4@α-CD nanoparticle was synthesized for the catalytic activation of peroxymonosulfate (PMS) towards carbamazepine (CBZ) degradation. The effect of α-CD content, Fe3O4@α-CD dosage and PMS concentration on the catalyst activity were systematically evaluated. The results showed the synergistic effect between α-CD and Fe3O4 can greatly improve the removal efficiency of CBZ in the Fe3O4@α-CD/PMS system. CBZ removal efficiency gained 73.37% in 5 min at pH 7.0 with PMS 1 mM, Fe3O4@α-CD load 0.4 g/L and CBZ 10 μM. The variation in the removal efficiency of different PPCPs under the same conditions mainly ascribed to the adsorption of α-CD and the activation of PMS by Fe3O4 to generate free radicals, in which sulfate radical (SO4·−) and hydroxyl radicals (·OH) was determined as the reactive species in the Fe3O4@α-CD/PMS system. Density functional theory (DFT) calculations was also utilized to optimize the structure of composite and confirmed that the charge distribution mainly concentrate on Fe3O4. As deduced from the LC-MS analysis, the possible CBZ degradation pathways were proposed. CBZ degradation efficiency still reached 54% after three cycle, which indicates that Fe3O4@α-CD catalyst has a good reusability potential and practical applications.
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