| 锯末对Cu~(2+)的吸附特性研究 |
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| 引用本文： | 赵雪涛,郜洪文. 锯末对Cu~(2+)的吸附特性研究[J]. 环境科学, 2010, 31(1): 217-222 |
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| 作者姓名： | 赵雪涛 郜洪文 |
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| 作者单位： | 同济大学污染控制与资源化研究国家重点实验室;苏州科技学院环境科学与工程系; |
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| 基金项目： | “十一五”国家科技支撑计划项目(2006BAJ08B10);;苏州科技学院院科研基金项目(Z1336) |
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| 摘 要： | 以工业废弃物锯末为吸附剂,研究其对水中Cu2+的吸附特性.结果表明,锯末对Cu2+的吸附速度较快,1 h后基本达到平衡.准二级速率方程很好地模拟了吸附反应的动力学方程(R20.99).锯末对Cu2+吸附主要机制是离子交换,吸附量随pH升高而升高.离子强度对吸附反应有一定影响:Cu2+和锯末一部分是内层结合,一部分是外层结合.经过酸碱处理的锯末在吸附能力上有了一定程度的提高.Langmuir模型对原始锯末的吸附等温线拟合最好,Langmuir-Freundlich模型对经过酸碱处理的锯末拟合最好.热力学分析显示吸附反应具有自发性、放热、熵增特性.
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| 关 键 词： | 锯末 吸附 Cu2+ 准二级速率方程 Langmuir-Freundlich模型 |
| 收稿时间： | 2009-02-02 |
| 修稿时间： | 2009-04-13 |
Characteristics of Cu2+ Adsorption by Sawdust |
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| ZHAO Xue-tao and GAO Hong-wen. Characteristics of Cu2+ Adsorption by Sawdust[J]. Chinese Journal of Environmental Science, 2010, 31(1): 217-222 |
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| Authors: | ZHAO Xue-tao and GAO Hong-wen |
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| Affiliation: | 1.State Key Laboratory of Pollution Control and Resource Reuse;Tongji University;Shanghai 200092;China.;2.Department of Environmental Science and Engineering;Institute of Science and Technology of Suzhou;Suzhou 215011;China |
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| Abstract: | Sawdust was used to remove the copper ion from water as an absorbent.The result showed that adsorption of Cu2+ on the sawdust was a very rapid process and arrived at equilibrium about 1 h.The pseudo-second order kinetic equation gave better fitting result(R2>0.99).The main mechanism of adsorption of Cu2+ on the sawdust was ion exchange,and the adsorption capacity increased as pH increased.Ion strength had some effects on adsorption capacity: one part of Cu2+ was held in an inner-sphere complex and the other... |
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| Keywords: | sawdust adsorption Cu2+ pseudo-second order kinetic equation Langmuir-Freundlich model |
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