Study On Preparation And Application Of S-Fe/Cu Bi-Component Micro-Electrolysis Material

The pretreatment of high-concentration printing and dyeing wastewater has become a key technology in the water treatment stage.As a green,simple and cost-effective approach,micro-electrolysis technology has attracted much attention and has become the best choice for the pretreatment of most high-concentration refractory wastewater.In order to further broaden the applicable p H range of wastewater treatment and improve the oxidation rate,in this study,copper was loaded on the surface of sponge iron（s-Fe）by chemical replacement method to prepare s-Fe/Cu two-component microelectrolytic material（Named OMEF）.In this paper,the mass ratio of s-Fe:Cu:Mn:C,calcination temperature and calcination time were investigated by single factor experiment.And through the orthogonal test to optimize the component distribution scheme of filler preparation.OMEF was analyzed by N₂ isotherm adsorption and desorption curve analysis,scanning electron microscope（SEM）analysis,X-ray diffraction（XRD）analysis,X-ray photoelectron spectroscopy（XPS）analysis,and Fourier transform infrared spectroscopy（FT-IR）analysis.The effects of reaction time,initial p H,one-time dosage of filler and cyclic utilization on the degradation of simulated methyl orange wastewater were discussed.A comparison between OMEF and a commercial filler revealed the market application prospect of OMEF.Through component comparison test and quenching test,the degradation mechanism of OMEF to methyl orange was analyzed and proposed.The research results showed that the optimal preparation conditions were:s-Fe:Cu:Mn:C=15:5:1:6.3（mass ratio）,calcination temperature 800℃,calcination time 120min.By BET,SEM,XRD,XPS,FT-IR characterization analysis,it was proved that OMEF had a large specific surface area（88.374 m²/g）,more functional groups（C-C,C-O,C=O and O-C=O,etc.）and active substances（Fe₃C,Mn O₂,etc.）.The optimal process parameters were as follows:the reaction time was 120 min,the initial p H was 8.26,and the primary dosage was 150 g/L.The removal ratio of COD by OMEF and commercially available fillers were 88.39%and 48.02%,respectively.And the B/C value of effluent was 0.74 and0.3,respectively.OMEF showed better performance than commercially available fillers.OMEF still showed strong activity after 5 times of repeated use,and the B/C of wastewater was maintained at 0.5.The oxidation rate of the material was improved by the galvanic reaction,direct reduction of Fe,oxidation of Fe,catalytic oxidation of Cu and Mn and co-precipitation of adsorption.This new strategy provides a new pretreatment approach for poorly biodegradable and refractory organic wastewater.