Sorption of tylosin on clay minerals.
Sorption of tylosin on clay minerals.
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DOI：
10.1016/j.chemosphere.2013.07.081
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发表时间：
2013-11
期刊：
影响因子：
8.8
通讯作者：
Qian Zhang;Chengfang Yang;Weilin Huang;Z. Dang;Xiaohua Shu
中科院分区：
文献类型：
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作者：
Qian Zhang;Chengfang Yang;Weilin Huang;Z. Dang;Xiaohua Shu
采用间歇式吸附装置，研究了不同pH值条件下泰乐菌素在高岭石和蒙脱石上的平衡吸附。结果表明，所有吸附等温线都是非线性的，并且对于给定的粘土，非线性随着溶液pH的增加而减小。在一定浓度下，TYL的单点吸附分配系数（KD）随溶液pH值的升高而迅速下降。一个依赖于物种的吸附模型，占的贡献的阳离子和中性形式的TYL拟合的数据很好，这表明吸附可能是由离子交换和疏水相互作用为主。等温线数据也很好地拟合到一个双模式模型，该模型量化了位点限制性朗缪尔组分（离子交换）和非特异性线性分配组分（疏水相互作用）的贡献。X射线衍射分析表明，由于TYL的吸收，蒙脱石层间发生了膨胀。TYL分子可能形成单层表面覆盖。
The equilibrium sorption of tylosin (TYL) on kaolinite and montmorillonite was measured at different solution pH using batch reactor systems. The results showed that all the sorption isotherms were nonlinear and that the nonlinearity decreased as the solution pH increased for a given clay. At a specific aqueous concentration, the single-point sorption distribution coefficient (KD) of TYL decreased rapidly as the solution pH increased. A speciation-dependent sorption model that accounted for the contributions of the cationic and neutral forms of TYL fit the data well, suggesting that the sorption may be dominated by both ion exchange and hydrophobic interactions. The isotherm data also fit well to a dual mode model that quantifies the contributions of a site-limiting Langmuir component (ion exchange) and a non-specific linear partitioning component (hydrophobic interactions). X-ray diffraction analyses revealed that the interlayers of montmorillonite were expanded due to the uptake of TYL. TYL molecules likely form a monolayer surface coverage.