| 活化铁锰结核的除氟性能研究 |
| 摘要点击 1705 全文点击 1094 投稿时间：2008-09-24 修订日期：2008-12-04 |
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| 中文关键词 铁锰结核 氯化铁 改性 高氟水 吸附 |
| 英文关键词 iron-manganese nodules FeCl3 modification high fluoride water adsorption |
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| 中文摘要 |
| 通过批实验研究接触反应时间、温度、共存阴离子对除氟效果的影响.结果表明，接触反应时间为48 h时，吸附都将近平衡.温度越高，越有利于氟离子的吸附.Langmuir和Freundlich吸附等温模式都可以较好地描述氟离子的吸附特性.热力学分析发现活化铁锰结核对氟的吸附为自发的吸热反应.当其他阴离子存在时，会对吸附造成不利影响.柱实验结果表明，活化铁锰结核动态除氟效果很好，性能稳定，机械强度高，易洗脱再生，且洗脱再生后饱和吸附量明显增大.出水中铁、锰含量不超过我国生活饮用水卫生标准.用Thomas模型分析，得到的平均饱和吸附量可达1.340 mg/g.X射线衍射和扫描电镜分析表明，经FeCl3活化的铁锰结核表面附着大量铁的氧化物或氢氧化物.这些铁的氢氧化物或氧化物对水中氟离子的去除起重要作用. |
| 英文摘要 |
| Adsorption of fluoride on FeCl3-activated manganese-iron nodules was investigated in this study. Influences of contact time, temperature and coexistence anions on F- adsorption were carried out in terms of batch tests. It was found that the fluoride adsorptions onto activated material achieved equilibrium gradually at about 48 h. The adsorption capacity increased with the increase in reaction temperature. Furthermore, the adsorption isotherm can be described as Langmuir and Freundlich models. Thermodynamical study reveals that fluoride adsorptions on the activated material are spontaneous and endothermic. In addition, the presence of coexistence anions shows negative effect on removal of fluoride. Column studies demonstrate that the activated adsorbent could efficiently adsorb F-. Concentrations of Fe and Mn in effluents meet Chinese sanitary standard for drinking water. Effectiveness of adsorbent for fluoride removal increases after regeneration, and the average capacity is up to 1.340 mg/g with 2 cycles of desorption and regeneration. Results of X-ray diffraction (XRD) and scanning electron microscopy (SEM) manifest that high adsorption capacity arose from conglutination of Fe oxides/ hydroxides to the surface of nodules and subsequently adsorption of F- on the fresh Fe hydroxides. Therefore, the activated absorbent has high adsorption capacity and stable property for F- removal, which shows that it is a potential material for F- removal in practice. |
