| 单宁酸铁吸附去除水中无机氮的性能与机制研究 |
| 摘要点击 1606 全文点击 1196 投稿时间：2015-04-30 修订日期：2015-07-04 |
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| 中文关键词 单宁酸铁 无机氮 吸附 模型分析 除氮机制 |
| 英文关键词 ferric tannate inorganic nitrogen adsorption models analysis nitrogen removal mechanism |
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| 中文摘要 |
| 通过批量吸附实验,研究了一种新型吸附材料——单宁酸铁吸附去除水中无机氮(NH4+-N、 NO2--N和NO3--N)的效果及其吸附机制. 结果表明,单宁酸铁对NH4+-N和NO2--N具有优先选择性,当单宁酸铁与NH4+-N和NO2--N的质量比为200时,NH4+-N和NO2--N去除率均大于95%. 运用吸附动力学模型、 Weber-Morris方程、 Langmuir和Freundlich方程进行实验数据拟合的结果表明,NH4+-N和NO2--N在单宁酸铁表面分别进行单分子层和多分子层的吸附,其吸附过程符合二级动力学模型,并且颗粒外部扩散和表面吸附起主要的作用. NH4+-N与分布于单宁酸铁外表面的氧负离子通过静电作用结合,NO2--N则与单宁酸铁中的铁离子通过静电作用和配位作用结合. 本研究为单宁酸铁作为吸附剂的发展与应用提供了科学依据. |
| 英文摘要 |
| A novel adsorbent material-ferric tannate was synthesized, and performances and mechanisms of NH4+-N, NO2--N and NO3--N were investigated via batch adsorption experiments. The results indicated that ferric tannate exhibited preferential adsorption for NH4+-N and NO2--N. When the mass ratios of ferric tannate to NH4+-N and ferric tannate to NO2--N were both 200, the removal efficiencies were both higher than 95%. The adsorption behaviors were analyzed with adsorption kinetic models, Langmuir and Freundlich isotherm adsorption models, and Weber-Morris equation. The results implied that NH4+-N and NO2--N were adsorbed on the surface of ferric tannate in the forms of monolayer and multilayer, respectively. The pseudo-second order kinetic model was more suitable to describe the adsorption processes, and the external particle diffusion and surface adsorption played the key roles in the adsorption process. NH4+-N could be combined with negative oxygen ions which distributed on the external surface of ferric tannate by the electrostatic interaction, whereas NO2--N could be combined with ferric ions in ferric tannate by the electrostatic interaction and coordination. The present study provided scientific evidence for the application of ferric tannate as a potential adsorbent in the future. |
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