Degradation of Imidazolium Chloride Ionic Liquids in Water by Thermally Activated Sodium Persulfate
Ionic liquids(ILs)have high chemical stability and resistance to biodegradation,especially the widely used imi-dazolium-based ILs,and their efficient removal from the water environment is imminent due to their potential ecotoxicity and environmental risks.In this experiment,1-ethyl-3-methylimidazolium chloride(EMICl)in water was degraded by ther-mally activated sodium persulfate advanced oxidation processes,and the effects of different reaction systems,reaction tem-perature,oxidant dosage,initial pH and coexisting inorganic anions on the degradation effect of ILs were investigated.The results showed that thermally activated sodium persulfate could effectively degrade ionic liquids compared to thermal alone and sodium persulfate alone.The removal rate of EMICl(10 mg/L)was up to 96.55%in 2 h when the reaction temperature was 60℃,the sodium persulfate dosage was 1 mmol/L,and the initial pH was 7.0.Moreover,the degradation of EMICl was followed the pseudo-first-order reaction kinetics,with an activation energy of 94.45 kJ/mol for the EMICl oxidation.SO·-4 and·OH were the main active species for the degradation of EMICl.Density functional theory(DFT)calculations indicated that the first major site attacked by EMICl were the C atoms on imidazolium ring,followed by the alkyl side chain.
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