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用液相非稳态共沉淀法制备了Mg-Al类水滑石(HTlc);Mg-Al HTlc于450℃下焙烧得焙烧类水滑石(CHTlc);采用结构重建法由CHTlc制备了十二烷基硫酸根(DS-)插层(改性)类水滑石(DS HTlc).研究了邻甲酚在Mg-Al HTlc,CHTlc和DS HTlc上的吸附行为:邻甲酚在Mg-Al HTlc,CHTlc和DS HTlc上的吸附动力学和等温式均分别符合准二级动力学方程和Freundlich方程,且吸附速率和吸附量大小均依次为:DS HTlc>>CHTlc>HTlc;在初始pH=5.00～13.00范围内,邻甲酚在HTlc和CHTlc上的吸附量随pH值的增加先增加后减小,随温度的增加而增加,邻甲酚在DS HTlc的吸附量随pH值和温度的增加而降低;邻甲酚在HTlc,CHTlc和DS HTlc上的吸附量均随电解质(NaCl)浓度的增加而增加,探讨了吸附机理.研究结果表明,DS HTlc有望成为一种新型的高效酚类有机污染物处理剂.
The Mg-Al hydrotalcite (HTlc) was prepared by liquid-phase unsteady coprecipitation method. The calcined hydrotalcite (CHTlc) was calcined at 450 ℃ for Mg-Al HTlc. The dodecane (DS HTlc). The adsorption behavior of o-cresol on Mg-Al HTlc, CHTlc and DS HTlc was investigated: o-cresol was adsorbed on Mg-Al HTlc, The adsorption kinetics and isothermal equation on CHTlc and DS HTlc are respectively in accordance with quasi-second-order kinetic equation and Freundlich equation, and the adsorption rates and adsorption capacities are as follows: DS HTlc >> CHTlc> HTlc; at the initial pH = 5.00 ~ In the range of 13.00, the adsorption amount of o-cresol on HTlc and CHTlc first increased and then decreased with the increase of pH, and increased with the increase of temperature. The adsorption amount of o-cresol on DS HTlc increased with the increase of pH and temperature The adsorption capacity of o-cresol on HTlc, CHTlc and DS HTlc increased with the increase of electrolyte concentration (NaCl), and the adsorption mechanism was discussed.The results show that DS HTlc is expected to become a new type of high efficiency phenolics Treating agent.