累托石对左氧氟沙星的吸附研究

The Adsorption of Levofloxacin onto Rectorite

利用累托石良好的吸附特性,以其为吸附材料,通过静态吸附实验研究了累托石对水体中左氧氟沙星的吸附机理;采用BET、XRF、FT-IR等表征手段对累托石结构和性能进行了分析.结果表明:累托石主要成分为Si O2和Al2O3,比表面积为7.54 m2/g,孔径为3.62 nm,层间距为2.50 nm,其对左氧氟沙星的吸附过程更加符合Langmuir等温模型和准二级动力学模型,且在p H=6时吸附效果最佳,最大吸附量达到63.38 mg/g;主要吸附机理是离子交换.

The behavior and mechanism of rectorite adsorbing levofloxacin in solution is studied with static adsorption experiments. The structural composition and physical properties of rectorite were characterized with BET,XRF and FT-IR. The specific surface area,diameter and the basal spacing of rectorite were 7.54 m2/g,3.62 nm and2.50 nm,respectively. The main components of rectorite were SiO2 and Al2 O3. The results showed that the adsorption process fit the Langmuir isothermal model and pseudo-second-order kinetic model well. The maximum removal rate occurred at pH 6,and the maximum adsorption capacity was 63.38 mg/g. The main adsorption mechanism was ion exchange.