期刊
CHEMICAL ENGINEERING JOURNAL
卷 313, 期 -, 页码 197-206出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.12.068
关键词
Mesoporous SBA-15; Phosphorous acid functionalized; Gd(111); High adsorption capacity; Fast adsorption kinetics
资金
- Fundamental Research Funds for the Central Universities, China University of Geosciences [CUG120115]
- Special Fund for Basic Scientific Research of Central Colleges, China University of Geosciences [CUGL090305, CUGL140413, CUGL150414]
- Natural Science Foundation of Hubei Province [2015CFB187]
- National Natural Science Foundation of China [21303170]
The development of rare earth adsorbent with high adsorption capacity and rapid adsorption rate is one of the most important issues for enriching and recovering rare earth ions. In the present Work, an inorganic phosphorous acid-modified mesoporous SBA-15 (P-SBA-15) was facilely synthesized by a simple and cost-effective post-grafting approach, and its adsorption behavior towards the rare earth ion Gd (III) was investigated. Benefiting from high specific surface area (669.7 m(2).g(-1)), large pore size (9.1 nm), and the presence of abundant phosphorous acid groups (1.4 mmol.g(-1)) on the surface, the P-SBA-15 exhibited an excellent performance in terms of capacity and kinetics on adsorption of Gd (III). Under optimized conditions, the adsorption capacity of P-SBA-15 towards Gd(III) was up to 1.3 mmol.g(-1) at 30 degrees C, which is the second highest value as compared with previously reported Gd(III) adsorbents. Moreover, the adsorption of Gd(III) onto P-SBA-15 was ultrafast, achieving adsorption equilibrium within only 2 min. Test of reusability revealed that this mesoporous adsorbent could be repeatedly used several times without significant loss in binding capacity. This work not dnly provides a new insight into the fabrication of phosphorous add-functionalized mesoporous silica, but also demonstrates its prospective application in adsorptive removal and/or recovery of rare earth ions. (C) 2016 Elsevier B.V. All rights reserved.
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