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镁铝类水滑石对邻、间、对甲基苯酚的吸附

李燕*,沈建强,杨国庆   

  1. (长治学院化学系 长治 046011)
  • 收稿日期:2011-08-01 修回日期:2011-09-18 出版日期:2012-07-10 发布日期:2012-07-10
  • 通讯作者: 李燕，副教授; Tel:0355-2178113; E-mail:liyan_china@126.com; 研究方向：胶体与界面化学
  • 基金资助:
    山西省高校科技开发项目（20091038）和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

Adsorption of o-, m-, p - cresol on Mg-Al Hydrotalcite-like compound

LI Yan*, SHEN Jianqiang, YANG Guoqing   

  1. (Department of Chemistry,Changzhi College,Changzhi 046011,China)
  • Received:2011-08-01 Revised:2011-09-18 Published:2012-07-10 Online:2012-07-10

PDF

1261

被引次数

2

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。

关键词: 类水滑石, 甲基苯酚, 吸附, 甲基位置

Abstract: 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.

Key words: Mg-Al hydrotalcite-like compound, Cresol, Adsorption, Substituent position

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