Fe2+/Na2S2O8法去除水中四环素的实验研究

摘要

研究了二价铁活化过硫酸钠法去除水中四环素(TC)的影响因素与机理,为四环素类废水的治理提供了新方法.研究结果表明,水中TC降解率随Na2S2O8浓度的增大而增大;随TC浓度的增加而减小;随Fe2+浓度升高,TC降解率先增大再减小,说明过高浓度的Fe2+对反应产生抑制作用.在初始条件TC浓度为10 μmol/L,Na2S2O8浓度50 μmol/L,Fe2+浓度50 μmol/L,pH为3.4时,TC降解率可以达到92%.利用分子探针法证明了体系中产生的自由基为SO-4·和·OH,其中SO-4·为主要作用自由基.%The influence factors and mechanisms of tetracycline(TC)degradation were investigated in aqueous solution by Fe2+activated persulfate and provided a new method for the treatment of tetracycline wastewater.The results showed that the removal efficiency of TC was significantly increased with the increasing of Na 2S2O8dosage, but decreased with the increasing of the initial TC concentration.For the effect of Fe2+,the degradation of TC in-creased at first and then decreased with the increasing of the concentration,which indicated that high concentration of Fe2+inhibited the reaction.TC degradation rate reached 92%when the initial concentration of TC was 10 μmol, the concentration of Na2S2O8was 50 μmol,the concentration of Fe2+was 50 μmol and pH was 3.4.The molecular probe test showed that SO -4· and·OH were produced in the reaction and SO -4· had a more important effect than that of·OH.