Performance of iopamidol degradation by MoS2@Fe3O4 Fenton-like system
MoS2@Fe3O4 composite was fabricated via two-step hydrothermal method,utilizing cetyltrimethyl ammo-nium bromide(CTAB)as a soft template,thioacetamide as a sulfur source,and sodium molybdate as a molybdenum source.The morphology and structure of MoS2@Fe3O4 were analyzed by SEM and XRD.The efficiency and mecha-nism of catalytic degradation of iodoprolol(IPM)by MoS2@Fe3O4/H2O2 system was evaluated.The results showed that Fe3O4 was deposited on the surface of MoS2,and MoS2@Fe3O4 had a uniformly dispersed flower ball structure,which provided more catalytic active sites.Under the conditions of initial pH of 4,MoS2@Fe3O4 dosage of 0.15 g/L,H2O2 concentration of 0.5 mmol/L,and IPM concentration of 5 µmol/L,the degradation rate of IPM by MoS2@Fe3O4/H2O2 system reached 89.85%after 30 minutes of reaction.Compared with Fe3O4/H2O2 system,the degradation rate of IPM increased by about 12%.The applied magnetic field facilitated the reusability of MoS2@Fe3O4.The main active species for IPM degradation by the MoS2@Fe3O4/H2O2 system were·OH and 1O2.The degradation rate of the MoS2@Fe3O4/H2O2 system on IPM remained stable over 80%after 6 cycles,suggesting that MoS2@Fe3O4 had good stability.
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