CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002, China; Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, No.1300 Jimei Road, Jimei, Xiamen, Fujian, 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002, China; Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, No.1300 Jimei Road, Jimei, Xiamen, Fujian, 361021, China.
Carbohydr Polym. 2018 Jun 15;190:255-261. doi: 10.1016/j.carbpol.2018.02.059. Epub 2018 Feb 22.
Inspired by the phenomenon of sponges soaking up water, a novel syringe-like adsorption device used diglycolamic-acid modified chitosan sponges (CSs-DGAA) as adsorbents is reported for recycling of rare-earth elements (REEs) by Squeezing & Soaking (S&S) operation. Integrating the elasticity of sponges and selective extraction ability of diglycolamic acid groups, the new device can efficiently recycle REEs from aqueous solutions. This device only needs 10 min to achieve adsorption equilibrium; squeezing the water from the sponges achieves solid-liquid separation. This syringe-like adsorption method not only solves the pollution problem caused by the organic solvents used during liquidliquid extractions, but also improves the time needed to achieve adsorption equilibrium and uses significantly less energy than energy intensive solid-phase extractions of solid-liquid separations. Moreover, the environment-friendly adsorbents effectively recycle yttrium and europium from waste phosphor powders. These experimental results demonstrated that the S&S method based on polymeric sponges has potential application in hydrometallurgy and environmental remediation.
受海绵吸水现象的启发，报道了一种新型注射器状吸附装置，该装置以二甘氨酰基改性壳聚糖海绵（CSs-DGAA）作为吸附剂，用于通过挤压-浸泡（S＆S）操作回收稀土元素（REEs）。该新型装置将海绵的弹性和二甘氨酰基的选择性萃取能力相结合，可从水溶液中有效回收 REEs。该装置仅需 10 分钟即可达到吸附平衡；将水从海绵中挤出即可实现固液分离。这种注射器状吸附方法不仅解决了液液萃取过程中使用有机溶剂所带来的污染问题，而且还缩短了达到吸附平衡所需的时间，与能量密集型固液分离的固相萃取相比，使用的能量也明显减少。此外，环境友好型吸附剂可有效从废荧光粉中回收钇和铕。这些实验结果表明，基于聚合物海绵的 S＆S 方法在湿法冶金和环境修复方面具有潜在的应用前景。
