铁炭复合材料对水体中SAs吸附去除性能的研究

Preparation of Iron-Carbon Composites and Their Performance in Sulfonamides Removal from Aqueous Solution

以木炭作为载体,固载水合氧化铁,采用抽真空旋转蒸发法制备铁炭复合材料,通过比较不同制备条件下复合材料对水体中磺胺类抗生素的去除效果,对制备条件进行优化。并采用批量平衡试验,研究了铁炭复合材料对磺胺类抗生素的吸附去除特性。结果表明:以Fe(NO3)3溶液浸渍,铁炭质量比为0.224∶1,固化9 h条件下去除水体中磺胺类抗生素效果最佳;铁炭复合材料对磺胺和磺胺吡啶的去除效果明显优于单一炭材料,铁炭复合材料对磺胺和磺胺吡啶的去除率随抗生素初始浓度增加而降低,酸性条件下磺胺和磺胺吡啶去除率高于中性和碱性条件,溶液中背景离子强度变化对磺胺和磺胺吡啶的去除影响较小;铁炭复合材料对磺胺和磺胺吡啶的去除符合一级动力学模型,为物理化学吸附和化学降解的协同作用,且在反应过程中生成中间产物。

Charcoal carrying hydrous iron oxide was prepared by the vacuum evaporation method. The performance of the iron-carbon composites in sulfonamides removal from aqueous solution was compared under different preparation conditions.The research focused on the adsorption and removal characteristics of the composites in sulfonamides on the basis of optimizing the preparation conditions by batch experiments. The composites with the impregnation of Fe（NO3）3 solution showed optimal performance when the mass ratio of iron and carbon was 0.224 ∶1 after curing for 9 h. It was shown that charcoal carrying hydrous iron oxide had better effect on sulfonamide and sulfadiazine removal than the single material.Decreasing with increasing initial concentration of antibiotics,the removal rate of sulfonamide and sulfadiazine in acid condition was higher than that in the neutral and alkaline condition,and the varying concentration of other ions did not affect the removal rate. The removal was fitted by the pseudo-first-order kinetics model,which presented a synergistic effect of physical adsorption and chemical degradation with the intermediate product in the process.