Aniline degradation in soil by activation of persulfate with sunflower straw-based carbon material
Sunflower straw-based carbon material(BC)was prepared from agricultural waste sunflower straw by slow pyrolysis.BC was characterized by specific surface area analyzer(BET),scanning electron microscope(SEM),X-ray diffractometer(XRD),and X-ray photoelectron spectroscopy(XPS),and its performance in activating persulfate(PMS)to degrade aniline(AN)in soil was investigated.The effects of pH,BC dosage,PMS concentration,organic matter and co-existing anions on AN degradation were investigated,and the reuse performance of BC was examined.The results showed that BC could efficiently activate PMS to degrade AN in soil,and the degradation rate of AN by BC/PMS system reached 100％in 30 min under the conditions of BC=0.1g/L,PMS=0.5mmol/L,AN=10mg/kg and pH=7.The results of free radical quenching experiments and electron paramagnetic resonance(EPR)tests indicated that the BC/PMS system was a non-radical reaction and 1O2 is the active species of the system.Mechanistic analysis elucidates that C=O was the active site on BC,which interacted with PMS to produce the active species 1O2.Cyclic stability experiments demonstrated the reusability of BC.
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维普
