| 锯末对Cu2+的吸附特性研究 |
| 摘要点击 3576 全文点击 2983 投稿时间：2009-02-02 修订日期：2009-04-13 |
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| 中文关键词 锯末 吸附 Cu2+ 准二级速率方程 Langmuir-Freundlich模型 |
| 英文关键词 sawdust adsorption Cu2+ pseudo-second order kinetic equation Langmuir-Freundlich model |
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| 中文摘要 |
| 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(R2>0.99).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. |
| 英文摘要 |
| 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 part of Cu2+ was held in an outer-sphere complex. Adsorption capacity of treated sawdust by acid and base increased compared to original sawdust. Isotherm of treated sawdust was fitted well by Langmuir-Freundlich model; original sawdust was fitted well by Langmuir model. Thermodynamics analysis showed that the adsorption process was spontaneous, exothermic and the entropy increased. |
