| Zn系LDHs覆膜改性人工湿地沸石基质除磷机制 |
| 摘要点击 4595 全文点击 1508 投稿时间：2016-01-26 修订日期：2016-03-25 |
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| 中文关键词 人工湿地 沸石 Zn-LDHs 覆膜改性 除磷机制 |
| 英文关键词 constructed wetlands zeolites Zn-LDHs coated modification mechanism of phosphorus removal |
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| 中文摘要 |
| 选择Zn系层状双金属氢氧化物（LDHs），采用水热-共沉淀法合成3种不同类型的Zn-LDHs（FeZn-LDHs、CoZn-LDHs和AlZn-LDHs）并覆膜于常用人工湿地沸石基质表面；利用模拟垂直流人工湿地小试系统，对原始沸石及3种Zn-LDHs覆膜改性沸石基质进行除磷净化实验、等温吸附-解吸实验以及动力学吸附实验，通过上述实验对以Zn-LDHs覆膜改性沸石基质为代表的改性基质除磷机制进行研究. 结果表明，Zn-LDHs覆膜改性沸石基质对磷素净化效果具有明显的提升功能，其中以FeZn-LDHs覆膜改性基质尤为突出；改性使基质的饱和吸附容量得以提高，增强了基质对磷酸盐的解吸性能，并使沸石基质对磷酸盐的主要吸附类型由物理吸附向化学吸附转换；通过对沸石基质类型及其改性方式的合理选择，可达到利用沸石人工湿地强化除磷以高效净化富营养化水体的目的. |
| 英文摘要 |
| Zn-Layered double hydroxides (LDHs) were selected to carry out the experiment in present work based on the previous research results. According to the co-precipitation method, three kinds of different Zn-LDHs (FeZn-LDHs, CoZn-LDHs and AlZn-LDHs) were synthesized by ZnCl2, FeCl3, AlCl3, and CoCl3 solution in alkaline conditions and Zn-LDHs were in-situ coated on the surface of natural zeolites. With the filling of the natural and three kinds of Zn-LDHs modified zeolites in the columns, test experiments were conducted to study the removal performance of phosphorus in vertical-flow constructed wetlands. The results showed that: compared with the natural zeolites, the removal rates of phosphorus by the three kinds of Zn-modified zeolites were greatly improved, especially for FeZn-LDHs. Moreover, the maximum adsorption capacity and the desorbed performance of phosphate were enhanced by the Zn-LDHs coated modification. The adsorption type of phosphate was converted from physical adsorption to chemical adsorption. Through reasonable selection of the type of zeolite and the method of modification, Zn-LDHs modified zeolites could be used to enhance the removal of nitrogen and phosphorus for the eutrophic water. |
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