| 李燕,史晓琴,赵巧云.化学通报,2014,77(10):985-989. |
| 镁铝类水滑石对阳离子染料中性红的吸附及机理研究 |
| Adsorption Properties and Mechanism of Neutral Redonto Mg2Al Hydrotalcite Compound |
| 投稿时间：2014-01-21 修订日期：2014-02-09 |
| DOI： |
| 中文关键词: 类水滑石 中性红 吸附 热力学 |
| 英文关键词:Hydrotalcite, Neutral red, Adsorption, Thermodynamics |
| 基金项目:山西省自然科学基金 |
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| 中文摘要: |
| 研究了镁铝类水滑石对中性红的吸附及其作用机理,考察了时间、pH值、温度、电解质浓度等因素对镁铝类水滑石吸附中性红的影响。结果表明,镁铝类水滑石对中性红的吸附动力学符合准二级动力学方程；热力学符合Langmuir 吸附等温式；在实验范围内,吸附量随溶液pH值的增大而增加,随温度的升高而降低,随电解质浓度的增加先增加后降低；吸附过程是放热、熵减小的自发过程。镁铝类水滑石对中性红的吸附机理为类水滑石与中性红分子中π电子的较强静电吸引作用。 |
| 英文摘要: |
| The adsorption of neutral red onto Mg2Al hydrotalcite compound in aqueous solutions was investigated. Experiments were carried out as function of contact time, pH, electrolyte concentration and temperature. It was found that the pseudo-second order kinetics model could be used to describe the adsorption process appropriately. The adsorption capacities of neutral red increased with the increasing pH, but decreased with the increasing temperature, and the adsorption capacity increased firstly and then decreased with the increase of electrolyte concentration. The equilibrium data was fitted well with the Langmuir model. The thermodynamic parameters such as ΔHθ, ΔSθ and ΔGθ were calculated from Langmuir parameters. The negative values of ΔHθ and ΔGθ confirm the exothermic and spontaneous nature of the adsorption process. The adsorption mechanism was discussed. |
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