粘土矿吸附过程中四环素基团变化研究

Functional Groups′ Variation of Tetracycline in the Process of Adsorption in Clay Minerals

湖南红壤主要由富含硅铝的高岭土和蒙脱石组成,选取这两种粘土矿作为吸附介质在实验室环境下模拟了四环素的吸附过程,通过高效液相色谱和红外光谱检测分析了四环素的主要基团在不同吸附阶段的变化,结果表明-OH是影响吸附速率和吸附量的主要基团,发生的吸附在解吸过程中也难于解吸;C=O主要在吸附后期起作用,吸附能力不强,易解吸,可能与其吸电子能力较弱有关。

Red soil in Hunan Province is consist of Kaolin ＆ Montmorillonite, 2 kinds of typical clay minerals rich in Si＆A1. We conducted experiments on the tetracycline（TC ） adsorption in the laboratory by selecting the clay minerals above as adsorptive medium, monitored and meseasured by HPLC and FTIR. The variation of main groups of TC were exhibted in different adsorption phases. Results showed that-OH was the main group which affected adsorption rate and adsorption capacity, the adsorption with-OH was hard to be desorbed once it was formed. C=O had its＇ effect in the later adsorption phase, but the adsorption ability was weak and the adsorption was easily desorbed. It was likely related to the weaker electrophilic ability.