| 水中Cu2+、Ni2+与腐殖酸、膨润土的相互作用研究 |
| 摘要点击 2435 全文点击 2854 投稿时间：2009-03-05 修订日期：2009-05-16 |
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| 中文关键词 重金属离子 腐殖酸 膨润土 动力学 热力学 |
| 英文关键词 heavy metal ions humic acid bentonite kinetics thermodynamics |
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| 中文摘要 |
| 研究了Cu2+、Ni2+与腐殖酸以及膨润土与腐殖酸的共存吸附剂的相互作用，考察了相互作用时间、初始pH、温度对相互作用的影响.结果表明，金属离子的去除率随时间增加而增大，吸附量随温度升高而增大.初始pH对Cu2+、Ni2+的去除率影响很大，pH在中性范围附近Cu2+、Ni2+的去除率可以达到最大.吸附动力学实验表明，Cu2+、Ni2+在腐殖酸及共存吸附剂上的吸附符合伪二级吸附速率模型，并得到Cu2+在腐殖酸及共存吸附剂上吸附的活化能Ea分别为17.01和38.49 kJ·mol-1，Ni2+在腐殖酸及共存吸附剂上吸附的活化能Ea分别为15.15和13.35 kJ·mol-1，表明吸附过程以物理吸附为主.Cu2+、Ni2+在腐殖酸及共存吸附剂上的吸附符合Langmuir等温线模型.得到的ΔH0、ΔS0和ΔG0表明金属离子在腐殖酸及共存吸附剂上的吸附是一个吸热、熵增、自发的过程. |
| 英文摘要 |
| Interactions of Cu2+, Ni2+ on humic acid and the mixture adsorbent of humic acid and bentonite were studied. The effects of contact time, initial pH and temperature were determined. The removal rate of the metal ions increased with increasing contact time. The adsorption capacities increased with increasing temperature. Initial pH had a great impact on the removal rate of metal ions, when initial pH was around 7, the maximum removal rate can be achieved. Characteristics of adsorption kinetics of Cu2+, Ni2+ from aqueous solutions on humic acid and mixture adsorbent were studied. The results showed that the adsorption process followed the pseudo second-order equation. The activation energy of Cu2+ on humic acid and mixture adsorbent were 17.01 kJ·mol-1 and 38.49 kJ·mol-1, and the activation energy of Ni2+on humic acid and mixture adsorbent were 15.15 kJ·mol-1 and 13.35 kJ·mol-1. The activation energy indicated that the adsorption process belonged to physics adsorption. The adsorption process followed the Langmuir isotherm. ΔH0，ΔS0 and ΔG0 calculated showed that the adsorptions of metal ions on humic acid and mixture adsorbent were endothermic, entropy increasing and spontaneous. |
