引用本文:
李燕, 沈建强, 杨国庆. 镁铝类水滑石对邻、间、对甲基苯酚的吸附[J]. 应用化学,
2012, 29(7): 788-793.
doi:
10.3724/SP.J.1095.2012.00343
Citation: LI Yan, SHEN Jianqiang, YANG Guoqing. Adsorption of o-, m-, p-Cresol on Mg-Al Hydrotalcite-like Compound[J]. Chinese Journal of Applied Chemistry, 2012, 29(7): 788-793. doi: 10.3724/SP.J.1095.2012.00343
Citation: LI Yan, SHEN Jianqiang, YANG Guoqing. Adsorption of o-, m-, p-Cresol on Mg-Al Hydrotalcite-like Compound[J]. Chinese Journal of Applied Chemistry, 2012, 29(7): 788-793. doi: 10.3724/SP.J.1095.2012.00343
镁铝类水滑石对邻、间、对甲基苯酚的吸附
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。
English
Adsorption of o-, m-, p-Cresol on Mg-Al Hydrotalcite-like Compound
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.
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Key words:
- Mg-Al hydrotalcite-like compound
- / cresol
- / adsorption
- / substituent position
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