Adsorptive removal of phosphorus from aqueous solution using sponge iron and zeolite
Adsorptive removal of phosphorus from aqueous solution using sponge iron and zeolite
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DOI：
10.1016/j.jcis.2013.03.057
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发表时间：
2013-07-15
影响因子：
9.9
通讯作者：
Xie, Jie
中科院分区：
文献类型：
--
作者：
Jiang, Cheng;Jia, Liyue;Xie, Jie
吸附除磷是人工潜流湿地中一种重要而有效的处理工艺。人们已经提出了许多去除废水中多余磷的材料。因此，选择具有高磷吸附能力的基质对于获得显著的除磷效果非常重要。本研究对海绵铁和沸石的除磷性能进行了评价，并与其物化性能进行了比较。通过间歇实验研究了影响海绵铁和沸石吸附去除水溶液中磷的可能机理。吸附速率数据符合准二级动力学方程。Freundlich和Langmuir模型较好地描述了吸附等温线数据。静态实验和动态实验(柱实验)的结果表明，海绵铁对磷的吸附更容易发生化学结合，而沸石更容易发生静电吸引或离子交换。对于海绵铁，部分Fe(III)(Fe~(3+))或Fe(H)(Fe~(2+))与磷酸根离子(P)形成Fe-P固相化合物。对于沸石来说，氧化铝和氧化硅在水溶液中形成络合物。由于静电吸引或离子交换，正负电荷表面位置有利于磷酸盐的吸附。(C)2013 Elsevier Inc.保留所有权利。
Phosphorus adsorptive removal is an important and efficient treatment process in constructed subsurface flow wetlands. Many materials have been proposed for removal of excess phosphorus from wastewater. Selecting a substrate with a high phosphorus adsorption capacity is therefore important in obtaining significant phosphorus removal. In this study, the phosphorus removal capacities of sponge iron and zeolite were evaluated and related to their physico-chemical characteristics. The potential mechanisms affecting the adsorptive removal of phosphorus from aqueous solutions onto sponge iron and zeolite were investigated in batch experiments. The pseudo-second-order kinetics were useful since the adsorption rate data fitted well. The Freundlich and Langmuir models well described the adsorption isotherm data. The results of static experiments and dynamic experiments (column experiments) indicated that the adsorption of phosphorus onto sponge iron was more apt to chemical combination, but zeolite was more apt to electrostatic attraction or ion-exchange. For sponge iron, some iron (iii) (Fe3+) or iron (H) (Fe2+) and phosphate ions (P) form Fe-P, the solid phases compound was fixed. For zeolite, aluminum oxide and silicon oxide formed complexes in aqueous solution. It was observed that positive or negative charge surface sites favored the adsorption of phosphate due to the electrostatic attraction or ion-exchange. (c) 2013 Elsevier Inc. All rights reserved.