纳滤分离水中阿莫西林及影响因素

Separation performance of amoxicillin in water by nanofiltration and the influencing factors

阿莫西林(AMX)是水环境被检测出的典型抗生素药物,对人类有潜在的危害。研究了AMX溶液浓度、操作压力对纳滤去除性能的影响,并探索了镁离子和腐殖酸(HA)对AMX分离性能的影响。结果表明,AMX浓度的增加能显著提升纳滤的分离效率,同时膜吸附量增加;操作压力的增加主要提升膜通量,对去除率影响不大。加入Mg^(2+)后,使得pH在5和8时的去除率略微上升,而在pH 10去除率略微减小。HA存在时,随pH的升高,AMX去除率呈先降后升的趋势,低HA浓度(5 mg/L)时的去除率大于高浓度(10 mg/L)时的去除率。结果表明,膜筛分作用是纳滤去除AMX的主要机制,HA的加入增强了膜筛分作用,Mg2+对AMX的去除率影响不大。

Amoxicillin(AMX)is a typical antibiotic drug detected in the aqueous environment and is potentially harmful to humans.The effects of AMX solution concentration and operating pressure on nanofiltration removal performance were investigated,and the effects of magnesium ions and humic acid(HA)on AMX separation performance were explored.The result showed that the increase of AMX concentration significantly enhanced the separation efficiency of nanofiltration,while the membrane adsorption increased;the increase of operating pressure mainly enhanced the membrane flux and had little effect on the removal rate.The addition of Mg 2+caused a slight increase in the removal rate at pH 5 and 8,and a slight decrease in the removal rate at pH 10.In the presence of HA,the AMX removal rate tended to decrease and then increase with increasing pH,and the removal rate at low HA concentration(5 mg/L)was greater than that at high concentration(10 mg/L).The above results showed that membrane sieving was the main mechanism of AMX removal by nanofiltration,and the addition of HA enhanced the membrane sieving effect,and Mg^(2+)had little effect on the removal rate of AMX.