| 树脂基纳米钛锆氧化物复合吸附剂同步去除水中磷和氟 |
| 摘要点击 2911 全文点击 1510 投稿时间：2016-11-04 修订日期：2016-12-14 |
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| 中文关键词 树脂基 复合吸附剂 钛氧化物 锆氧化物 除磷除氟 |
| 英文关键词 polymer-based composite adsorbent titanium oxides zirconium oxides phosphorus and fluorine removal |
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| 中文摘要 |
| 以大孔强碱性阴离子交换树脂D201为基体，负载纳米钛、锆氧化物，制备新型树脂基纳米钛锆氧化物复合吸附剂Ti-Zr-D201.通过吸附等温线实验、pH影响实验、竞争吸附实验、动力学实验及柱吸附实验，并结合对吸附剂的表征，探讨了复合吸附剂对水中磷和氟的吸附性能和相应的吸附机制.结果表明，当pH值为5.8，温度为308K时，Ti-Zr-D201对磷和氟的Langmuir拟合最大吸附容量分别是34.9 mg·g-1和35.1 mg·g-1，且吸附行为是自发进行的，温度越高，吸附效果越好；与磷相比，pH值对Ti-Zr-D201吸附氟的影响更为显著；选取SO42-、NO3-和Cl-作为竞争离子，Ti-Zr-D201较基体D201表现出很好的抗干扰能力；内扩散模型拟合结果表明Ti-Zr-D201在吸附平衡前存在两个不同的吸附阶段；柱吸附实验表明Ti-Zr-D201具有稳定的结构和良好的动态吸附性能，并且可再生循环使用，具备实际应用的潜力. |
| 英文摘要 |
| A novel composite adsorbent (Ti-Zr-D201) for simultaneous removal of phosphate and fluoride from water was prepared by loading nanosized titanium and zirconium oxides on the anion exchange resin named D201. Combining with the characterization of the adsorbent, adsorption isotherm experiments, effect of solution pH experiments, competitive tests, kinetic experiments and fixed bed column adsorption experiments were performed to explore the adsorption performance and mechanism. The maximum adsorption capacity of Ti-Zr-D201 for phosphorus and fluorine was 34.9mg·g-1 and 35.1mg·g-1 respectively, when the pH value was 5.8 and the temperature was 308K. Adsorption behavior was spontaneous, and higher temperature was favorable for phosphorus and fluoride adsorption. The effect of pH on the adsorption of fluoride was more significant compared with the adsorption of phosphorus. SO42-, NO3- and Cl- were selected as the competitive ions for competition experiments, and the results indicated that Ti-Zr-D201 exhibited favorable sorption selectivity for phosphorus and fluoride compared with the host material D201. The fitting results of the internal diffusion model showed that there were two different adsorption stages before the adsorption equilibrium of Ti-Zr-D201. Column adsorption experiments showed that Ti-Zr-D201 had a stable structure, excellent dynamic adsorption performance, and could be recycled, which showed the potential of practical application. |
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