采用批实验的方法讨论了四环素在改性凹凸棒土中的吸附行为以及pH值和阳离子对吸附的影响.结果表明:四环素吸附初始速度较快,并在4h左右达到平衡,吸附体系符合准二级吸附动力学模型；吸附等温线可采用Freundlich方程进行较好的拟合；吸附过程为自发的吸热过程；四环素吸附量在pH值为3时达到最大,随着pH值的增加而降低；阳离子浓度越大,价态越高,吸附量越小.%Soiption of tetracycline on modified attapulgite and the effect of pH value and cation on the sorption were investigated using batch experiments. The result showed that the sorption was relatively fast and reached equilibrium in 4 h, and fitted the pseudo-second-order kinetics model; Freundlich isotherm was appropriate to determine the present system; the sorption was a spontaneous and endothermic process; the amount adsorbed tetracycline reached maximum when pH value was 3, then it reduced as pH value increased; with the more cation concentration, the higher valence state, the amount adsorbed tetracycline was less.
展开▼
