Preparation and characterization of the biochar supported iron composite catalyst through carbothermal process for catalytic oxidation of Congo red
Iron,as one of the environment friendly and compatible elements,was widely used for catalytic oxidation of organic pollutants due to the variety valence.The catalytic species contained zero valent ion and Fe.In this work,a kind of porous char supported iron catalyst containing zero valent ion and Fe0.96S were prepared under carbothermal reduction process,in which the soluble starch and FeSO4 were conducted as carbon and iron precursors,respectively.The micromorphology and phase of the iron during carbothermal reduction process were characterized by XRD and SEM analysis.The catalytic activity of KPS activation for Congo red(CR)degradation was conducted in a batch experiments.The main factors determined the CR degradation efficiency was reported.A kind of porous char supported zero valent iron and Fe0.96 S was prepared under 800℃.The CR degradation efficiency attained to about 100％within 30 min in the presence of the catalyst with a dosage of 1 g/L and the initial CR concentration of 500 mg/L.Organic acid with small molecular was formed during the CR degradation,resulting in the decreased pH value to about 3.Therefore,the porous char supported zero valent iron and Fe0.96 S catalyst could be successfully prepared for activating KPS to degrade the CR with favorable activity,which is also promising in catalytic degradation of organic pollutants in wastewater.
ironcatalytic oxidationpotassium persulfateCongo red
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