Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 19, Pages 9719-9725Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4027967
Keywords
Mg(OH)(2) nanoparticles; rare earth elements; recycling; self-supported; ion-exchange; water treatment
Funding
- National Basic Research Program of China [2010CB933501, 2013CB934302]
- Outstanding Youth Fund [21125730]
- National Natural Science Foundation of China [21273237, 21103191]
- Fund of Fujian Key Laboratory of Nanomaterials [2006L2005]
- Fujian Science Foundation Grant [2012J05035]
- Knowledge Innovation Program of the Chinese Academy of Sciences [KJCX2-YW-N50, KJCX2-EW-J02]
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Treatment of wastewater containing low-concentration yet highly-expensive rare earth elements (REEs) is one of the vital issues in the REEs separation and refining industry. In this work, the interaction and related mechanism between self-supported flowerlike nano-Mg(OH)(2) and low-concentration REEs wastewater were investigated. More than 99% REEs were successfully taken up by nano-Mg(OH)(2). Further analysis revealed that the REEs could be collected on the surface of Mg(OH)(2) as metal hydroxide nanoparticles (<5 nm). An ion-exchange model was proposed as a critical factor for both guaranteeing the reaction speed and maintaining the self-supported structure of the materials. In addition, a method was developed to further separate the immobilized REEs and the residual magnesium hydroxide by varying the solution pH. In a pilot-scale experiment, the REEs from practical wastewater were immobilized effectively at a high flow rate. We anticipate this work can provide a good example for the recycling of valuable REEs in practical industrial applications.
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