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化学学报
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化学学报 ›› 2012, Vol. 70 ›› Issue (06): 683-690.DOI: 10.6023/A1110081    下一篇

研究论文

邻甲酚在类水滑石、焙烧及改性类水滑石上的吸附

李燕, 施利文, 刘志山, 杨国庆   

  1. 长治学院化学系 长治 046011
  • 投稿日期:2011-10-08 修回日期:2012-01-10 发布日期:2012-01-20
  • 通讯作者: 李燕
  • 基金资助:

    国家自然科学基金(No. 20573065)、山西省高校科技开发(No. 20091038)和2010 年山西省普通高等本科学校大学生创新性实验资助项目.

Sorption of o-Cresol on Pristine, Calcined and Modified Hydrotalcite-like Compounds

Li Yan, Shi Liwen, Liu Zhishan, Yang Guoqing   

  1. Department of Chemistry, Changzhi College, Changzhi 046011
  • Received:2011-10-08 Revised:2012-01-10 Published:2012-01-20
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No. 20573065), the project of Shanxi Province Higher Educational Science and Technology Program (No. 20091038) and 2010 Shanxi Province College of Innovative Pilot Project.

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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.

关键词: 类水滑石, 焙烧类水滑石, 改性类水滑石, 邻甲酚, 吸附

Mg-Al hydrotalcite-like compound (HTlc), calcined HTlc (CHTlc) and dodecylsulfate anionintercalated Mg-Al HTlc (DS·HTlc) were prepared. The sorption behavior of o-cresol on the HTlc, CHTlc and DS·HTlc was investigated. The sorption kinetics and sorption isotherms of o-cresol on the HTlc, CHTlc and DS·HTlc can all be well fitted with the pseudo-second order kinetic and Freundlich equation, respectively. The results indicated that the sorption rate and sorption amount of o-cresol on the DS·HTlc is much higher than that on the CHTlc, which is little higher than that on the HTlc. The sorption amount of o-cresol on the HTlc and CHTlc increased firstly and then decreased with increasing pH in the initial pH range of 5.00～13.00 and increased with increasing temperature. The sorption amount of o-cresol on the DS·HTlc decreased gradually with increasing initial pH and temperature. The sorption amount of o-cresol on the HTlc, CHTlc and DS·HTlc increased with the increasing electrolyte (NaCl) concentration. The sorption mechanism was discussed in detail and the DS·HTlc will be a new kind of highly effective adsorbent for phenolic pollution.

Key words: Mg-Al hydrotalcite-like compound (HTlc), calcined HTlc, dodecylsulfate ion-intercalated HTlc, o-cresol, sorption