粉煤灰/水合氧化铁复合吸附剂去除水中磷(Ⅴ)

Removal of phosphate from wastewater using fly ash/ferrihydrite composite adsorbent

以粉煤灰和硝酸铁为原料制备了粉煤灰/水合氧化铁复合吸附剂。通过扫描电子显微镜(SEM)对吸附剂进行微观形貌观察,采用静态吸附实验方法,分别用碱处理过的粉煤灰和粉煤灰/水合氧化铁复合吸附剂处理含磷酸氢根废水,得到了吸附等温平衡数据。用Langmuir模型和Freundlich模型进行回归分析。结果表明,未负载粉煤灰对磷酸氢根的吸附比较符合Langmuir模型,而粉煤灰/水合氧化铁复合吸附剂更符合Freundlich吸附模型。

Fly ash/ferrihydrite composite adsorbent was prepared with fly ash and iron nitrate as raw materials in this study. Apparent characteristic of adsorbent was studied by means of scan electronic microscope （SEM）. The removal of phosphate from wastewater was evaluated using fly ash treated with alkali and fly ash/ferrihydrite composite adsorbent. Also, batch experiments for adsorption were performed and the data of adsorption equilibrium were obtained. The results from Langmuir and Freundlich model regression analysis showed that the pattern of adsorption of phosphate with fly ash treated by alkali matches the Langmuir model, and fly ash/ferrihydrite composite adsorbent matches the Freundlich model.