Preparation of a Micro-electrolytic Filler of Ce-doped Sponge Fe/Cu-C Composite and the Degradation of Caprolactam Wastewater
Caprolactam wastewater has high COD and poor biochemistry.To increase the micro-electrolytic degradation efficiency of caprolactam,we prepared a micro-electrolytic filler of Ce-doped composite and investigated its degradation effect and mechanism of action toward caprolactam wastewater.The chemical replacement method was utilized to load Cu on the surface of sponge Fe(s-Fe)to form bimetallic reduction particles,which were subse-quently mixed with activated carbon,MnCO3,CeO2,and other components,followed by high-temperature calcina-tion to produce the electrolytic filler.By means of BET,SEM and XRD characterizations,we analyzed the physico-chemical properties of fillers obtained with different component ratios and explored the role of each component and the corresponding mechanism.Results show that the micro-electrolytic filler of Ce-doped composite significantly en-hances the degradation of caprolactam.Under the optimum component ratio for preparing s-Fe/Cu(i.e.,activated carbon,manganese carbonate with a s-Fe∶Cu∶Mn∶C ratio of 15∶5∶1∶6.3,a cerium content of 9% and a bentonite content of 30%),the degradation rate of caprolactam wastewater by using the micro-electrolytic filler reaches 74.68%,and the removal rate of COD reaches 90.43%.Compared with a commercial filler,the removal rate of caprolactam wastewater by our filler is 55.65%higher than that by the commercial filler,and the B/C increases from 0.25 to 0.81,higher than 0.43 by the commercial filler,alongside the biodegradability being significantly im-proved.XPS analysis and quenching experiments show that the filler produces three free groups including·OH,·O2-and 1 O2,which promote the degradation of organic substance.
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