Lanthanum-modified magnetic oyster shell and its use for enhancing phosphate removal from water
Lanthanum-modified magnetic oyster shell and its use for enhancing phosphate removal from water
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DOI：
10.1016/j.colsurfa.2021.127897
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发表时间：
2021-11-22
影响因子：
5.2
通讯作者：
Feng，Lei
中科院分区：
文献类型：
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作者：
You，Kai;Yang，Wenke;Feng，Lei
采用磁化和负载La的方法制备了La-Fe-OSP磁性牡蛎壳，并对其性能和除磷性能进行了研究。结果表明，La-Fe-OSP具有磁性，比表面积和孔隙率较改性前显著增加。La-Fe-OSP对各种磷酸盐溶液(L−1的10-100g)的去除效率均达到90%以上，并可通过外加磁场成功回收。La-Fe-OSP对磷的吸附过程符合准二级模型和朗缪尔模型，表现出颗粒内扩散特性。La-Fe-OSP在pH值3.0~8.0范围内均能保持良好的吸附性能，其吸附性能受共存离子和水中溶解有机物(DOM)的影响不大。La-Fe-OSP对上覆水和孔隙水的最大除磷效率分别为96.4%和41%。此外，La-Fe-OSP还略微改变了沉积物中各种形态磷的顺序，促进了易释放的铁结合态P(Fe-P)向难释放的闭锁态P(Oc-P)的转化。经过连续5次循环，La-Fe-OSP的除磷效率仍达到85.1%，显示出良好的应用前景。
A lanthanum-modified magnetic oyster shell (La-Fe-OSP) was prepared by magnetization and lanthanum loading, and then its properties and phosphorus removal capability were studied. The results showed that La-Fe-OSP was magnetic, and the specific surface area and porosity increased remarkably compared with those before modification. La-Fe-OSP achieved a removal rate greater than 90% for various phosphate solutions (10–100 mg L−1) and could be successfully recycled by applying a magnetic field. The phosphorus adsorption process of La-Fe-OSP could be characterized by a pseudo-second order model and Langmuir model and displayed intraparticle diffusion properties. La-Fe-OSP could maintain the novel adsorption performance within the pH range of 3.0–8.0, and its adsorption capability was negligibly affected by coexisting ions and dissolved organic matter (DOM) in water. Moreover, the maximum phosphorus removal rates of La-Fe-OSP for the overlying water and the pore water were 96.4% and 41%, respectively. In addition, La-Fe-OSP application also slightly changed the order of various phosphorus forms in sediment and promoted the transformation of easily released iron-bound P (Fe-P) to hardly released occluded P (Oc-P). After five successive cycles, La-Fe-OSP still obtained 85.1% phosphate removal efficiency and thus showed excellent application prospects.