酸改性膨润土对左氧氟沙星的吸附研究

Adsorption of Levofloxacin onto Acid-Modified Bentonite

采用紫外吸收光谱法研究了酸改性膨润土吸附左氧氟沙星的分析方法。实验系统研究了溶液pH值、吸附时间、吸附剂用量等条件对左氧氟沙星测定结果的影响,最终确定了最佳分析条件。结果表明,强酸性条件有利于改性膨润土对左氧氟沙星的吸附,最佳pH值为2,吸附平衡时间为10 min。通过对左氧氟沙星的吸附等温线数据进行拟合,Freundlich等温模型优于Langmuir等温模型。通过描述改性膨润土吸附左氧氟沙星的动力学过程,该吸附过程更符合准二级动力学模型(相关系数为0.99994)。

A method for adsorption of levofloxacin onto bentonite by ultraviolet absorption spectroscopywas established.The influence of pH value,adsorption time and adsorbent dose for adsorption of levofloxacin were investigated.The optimum pH value was 2,and the shaking time was only 10 min.By fitting the adsorption isotherm data of levofloxacin,Freundlich isotherm model was better than Langmuir isotherm model.By describing the kinetic process of levofloxacin adsorption onto bentonite,the adsorption process followed the pseudo-second-order model(the correlation coefficient was 0.99994).