期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 633, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.127897
关键词
Oyster shell; Lanthanum; Modified; Phosphate; Magnetization; Adsorption
资金
- National Natural Science Foundation of China [31470577]
- Science, Technology Major Projects of Industry-University Cooperation in Universities and Colleges of Fujian Province [2019N5006]
The lanthanum-modified magnetic oyster shell (La-Fe-OSP) exhibited high phosphorus removal efficiency, successful recyclability, and excellent adsorption performance under various conditions, making it a promising new type of phosphorus adsorbent with broad application prospects.
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-FeOSP 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.
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