镁铝类水滑石对邻、间、对甲基苯酚的吸附

采用液相非稳态共沉淀法制备了镁铝类水滑石（Mg-Al HTlc），并研究了邻、间和对甲基苯酚在Mg-Al HTlc上的吸附行为。 结果表明,邻、间和对甲基苯酚在Mg-Al HTlc上的吸附等温方程均符合Freundlich吸附等温式；吸附动力学均符合准二级动力学方程；在实验范围内，Mg-Al HTlc对三者的吸附量为：对甲基苯酚＞邻甲基苯酚＞间甲基苯酚；在pH值5.00~13.00范围内，三者的吸附量均随pH值的增加先增大后减小、随温度升高和电解质（NaCl）浓度的增大而增大。 探讨了吸附机理和苯环上甲基取代基位置对吸附的影响。

Adsorption of o-, m-, p-Cresol on Mg-Al Hydrotalcite-like Compound

Mg-Al hydrotalcite-like compound(HTlc) was prepared by a coprecipitation method.The adsorption behaviors of o-,m-and p-cresol on the Mg-Al HTlc were investigated.The results indicated that the adsorption isotherms of o-,m-and p-cresol on HTlc could be well fitted with the Freundlich equation and the adsorption kinetics could be well described by a pseudo-second-order kinetic.The adsorption rate and adsorption amount of p-cresol on the HTlc is slightly higher than that of o-cresol,which is higher than that of m-cresol at the same equilibrium cresol concentration.The adsorption amounts of o-,m-and p-cresol increased firstly and then decreased with the increasing pH in the rang of 5.00~13.00,increased with the increase of temperature and electrolyte(NaCl) concentration.The adsorption mechanism of cresol on HTlc and the effect of substituent CH3 position on the adsorption were discussed.