期刊
NEW JOURNAL OF CHEMISTRY
卷 41, 期 15, 页码 7739-7750出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nj02177a
关键词
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资金
- National Natural Science Foundation of China [21576120, 21446015, U1507115, U1507118]
- Natural Science Foundation of Jiangsu Province [BK20140534, BK20140580, BK20151350, BK20131223]
The separation and reutilization of rare-earth metals are flourishing in numerous advanced technologies, yet the development of a sustainable method to conveniently adsorb rare-earth metal ions remains a challenge waiting for a breakthrough. Chitosan, as a natural and biodegradable material, has been frequently studied to synthesize adsorbents for adsorption of rare-earth metals. In this study, a magnetic bio-adsorbent Fe3O4-C-18-chitosan-DETA (FCCD) composite was first prepared via a simple `` surface deposition-stepwise grafting'' method. The results show that the adsorption capacity of Dy3+, Nd3+, and Er3+ to the as-obtained FCCD is about 28.3, 27.1, and 30.6 mg g(-1), respectively, at 25 degrees C and optimal pH (7.0). The kinetics data followed a pseudo-second-order equation, and the Langmuir equation fitted well to the adsorption isotherms. Subsequently, the as-synthesized adsorbent (FCCD) can be successfully regenerated and recycled for 5 cycles using hydrochloric acid as the eluent. This study develops a promising candidate for practical application in the recovery of rare-earth metal ions owing to its magnetic separation, good acid-resistance, and excellent adsorption capacity.
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