微球炭吸附左氧氟沙星及其氧化再生性能研究

Adsorption of carbon microspheres for levofloxacin and their oxidative regeneration properties

采用一步合成法制备一系列乙烯焦油微球炭,考察了吸附温度、吸附时间以及底物浓度等因素对微球炭吸附废水中左氧氟沙星污染物效果的影响,并采用湿式氧化等多种高级氧化方法对吸附饱和的微球炭进行再生性能研究。结果表明,微球炭吸附率随微球炭质量和吸附时间的增加而增大;湿式氧化再生效果优于电催化等其他再生方法,相较于初始饱和吸附量25.96 mg/g,再生饱和吸附量达71.98 mg/g。经过湿式氧化后的微球炭比表面积及表面含氧官能团的数量均有明显增加,这有利于微球炭对左氧氟沙星污染物的进一步吸附。

A series of ethylene tar-derived carbon microspheres are prepared through one-step synthesis method.The effects of adsorption temperature,initial aqueous pH and the concentration of substrate on the performance of carbon microspheres in adsorbing levofloxacin pollutants in wastewater are investigated.Various advanced oxidation methods such as wet oxidation,electro-oxidation,Fenton oxidation and ozonation are employed to regenerate the saturated carbon microspheres.The results show that the adsorption rate of carbon microspheres increases with the rises of the amount of carbon microspheres and adsorption time.The regeneration effect by wet oxidation method is better than that by other regeneration methods.Compared with the initial saturated adsorption capacity of 25.96 mg·g^(-1),the saturated adsorption capacity of regenerated carbon microspheres reaches 71.98 mg·g^(-1).Through regeneration by wet oxidation,both specific surface area of carbon microspheres and the number of oxygen-containing functional groups on the surface of carbon microspheres significantly increase,which is beneficial for the further adsorption of carbon microspheres to levofloxacin.