| 水杉锯末对三价铬离子的吸附机理研究 |
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| 引用本文： | 吕慧峰,翟建平,李琴,周隽.水杉锯末对三价铬离子的吸附机理研究[J].环境科学与技术,2007,30(8):24-25,32. |
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| 作者姓名： | 吕慧峰 翟建平 李琴 周隽 |
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| 作者单位： | 南京大学环境学院,污染控制与资源化研究国家重点实验室,南京,210093 |
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| 摘 要： | 用酸碱电势滴定法和静态实验对木屑表面的带电状况﹑Cr3+的吸附规律及其吸附反应焓进行了研究,并用X射线光电子能谱对吸附Cr3+前后的木屑表面元素进行了测定。结果表明木屑的等电点(pHzpc)为3.2,pH大于时表面带负电;木屑表面的羧基离子是带电的主要官能团,也是吸附Cr3+的主要基团;羧基与Cr3+之间为1∶1的配位吸附。
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| 关 键 词： | 酸碱电势滴定 吸附反应焓 化学吸附 |
| 文章编号： | 1003-6504（2007）08-0024-03 |
| 修稿时间： | 2006-07-252006-09-13 |
Adsorption Mechanism of Cr3+ by Metasequoia Sawdust |
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| LV Hui-feng,ZHAI Jian-ping,LI Qin,ZHOU Jun.Adsorption Mechanism of Cr3+ by Metasequoia Sawdust[J].Environmental Science and Technology,2007,30(8):24-25,32. |
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| Authors: | LV Hui-feng ZHAI Jian-ping LI Qin ZHOU Jun |
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| Abstract: | Surface charge of Metasequoia sawdust was determined through potentiometric titration. Batch experiment was conducted to determine pH effect and ehthalpies of binding of Cr3+ to sawdust. Surface chemistry was characterized by X-ray photoelectron spectroscopy before and after Cr3+ adsorption. Results indicated that carboxylate is mainly responsible for negative surface charge and adsorption of Cr3+ and binding of Cr3+ with carboxyl groups on sawdust surface is a bimolecular coordination reaction. |
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| Keywords: | potentionmetric titration adsorption enthalpies coordination adsorption |
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