Preparation of ozone catalyst by thermal reduction of chromium residue with biomass and its performance
In this work,ozone catalyst with excellent activity,stability and safety was prepared by rice husk thermal reduction of chromium ore processing residues (COPR),during which the iron-containing oxides in COPR was reduced and chromium slag was simultaneously detoxified. Taking the degradation of simulated phenol wastewater as a model reaction,the effects of rice husk dosage and roasting parameters on the catalytic ozonolysis performance of the resulting catalysts were investigated. The results indicate,under the condition of mass ratio of rice husk and COPR 0.75,reduction temperature 1000 ℃,holding time 15 min and heating rate 20 ℃/min,the active of the obtained catalyst is the highest. Its main component are Fe,Fe3O4 and Fe-containing spinel. The degradation rate of phenol wastewater by catalytic ozonation reaches 99％ within 60 min,and the TOC removal rate reaches 92.6％. In addition,after eight consecutive usage,no performance degradation was observed for the catalyst,which indicating its excellent stability. Moreover,the leaching concentration of Cr(Ⅵ) in the treated wastewater is far below the national wastewater discharge standard.
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