摘要
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。
Mg-Al hydrotalcite-like compound （HTIc） 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 HTIc 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 the effect of substituent and electrolyte （NaCl） concentration. The adsorption mechanism of cresol on HTIc and CH3 position on the adsorption were discussed.
出处
《应用化学》
CAS
CSCD
北大核心
2012年第7期788-793,共6页
Chinese Journal of Applied Chemistry
基金
山西省高校科技开发项目(20091038)
2010年山西省普通高等本科学校大学生创新性实验项目资助
关键词
类水滑石
甲基苯酚
吸附
甲基位置
Mg-Al hydrotalcite-like compound, cresol, adsorption, substituent position
