三种氟喹诺酮类抗生素在黄河沉积物中的吸附行为

Adsorption behaviors of three fluoroquinolone antibiotics onto Yellow River sediments

采用批平衡法研究了3种氟喹诺酮类抗生素环丙沙星、诺氟沙星、恩诺沙星在黄河沉积物上的吸附特性.结果表明：环丙沙星、诺氟沙星、恩诺沙星在沉积物中的吸附均呈现先快速增长后缓慢平衡的趋势,吸附平衡时间皆为12 h,平衡吸附量分别为88.97、76.25、54.53 mg/kg.吸附数据与准二级动力学方程有较好的拟合,反应速率常数为11.59-225.70g/（mg·h）.吸附等温线能较好地符合Henry方程和Freundlich方程,沉积物对环丙沙星和诺氟沙星的吸附能力较强,对恩诺沙星的吸附效果较差.

A batch equilibrium method was used to investigate the adsorption characteristics of three kinds of fluoroquinolone antibiotics, i.e. ciprofloxacin （CIP）, norfloxacin （NOR）, enrofloxacin （ENR）, onto Yellow River sediments and the results showed that the adsorption process of CIP, NOR, ENR onto sediments was a two-step one： a rapid adsorption followed by a slow balance. The equilibrium time was about 12 h, and equilibrium ad- sorption capacity reached 88.97, 76.25, 54.53 mg/kg, respectively. The kinetic results indicated that the adsorp- tion process followed the pseudo-second-order model, with the adsorption rate in the rage of 11.59-225.70 g/ （mg. h）. Adsorption isotherms were well described by Henry and Freundlich equations, demonstrating that CIP and NOR had a strong tendency to adsorb onto sediments while the adsorption of ENR was unfavorable.