2022年2月20日
本研究报告了使用环境友好的萃取溶液(NH4)2SO4、GLDA、TBAB和水)和PCDP-M-SHM作为复合材料,从工业污泥中回收稀土元素的绿色方法,该复合材料可以选择性地吸附浸出液中的稀土元素[1]。结果显示,本研究中使用的提取溶液之间没有明显的差异。此外,化学成分分析表明,工业污泥中的大部分REE都被束缚在水溶性的部分,有利于绿色浸出液。从经济角度来看,水被用作示范提取溶剂。此外,除Ce(8.29%)外,REEs的回收效率在76.0%(Gd)至87.3%(Pr)之间。
PCDP-M-SHM的合成方法如下。β-环糊精杂化物(CDP@Fe3O4)被掺入硅石中的2-乙基己基膦酸单体(PC88A)功能化[2]。掺入PC88A的二氧化硅杂化制剂(SHM)与β-CD、四氟对苯二腈(TFP)、Fe3O4颗粒、K2CO3和无水THF/DMF(9:1)混合,在N2气氛下于85℃回流48小时,然后用外部磁铁用各种溶剂提纯。
[1] François Nkinahamira, Shanshan Guo, Meixian Cao, Yiqing Zhang, Bahareh Asefi, Senlin Sun, Meiling Feng, Qian Sun, Chang-Ping Yu: A closed-loop system to recycle rare earth elements from industrial sludge using green leaching agents and porous β-cyclodextrin polymer composite. Resources, Conservation and Recycling 180, May 2022, 106152. https://doi.org/10.1016/j.resconrec.2021.106152
[2] François Nkinahamira, Alaaeddin Alsbaie, Yuwen Wang, Xiaoyong Yang, Tian-Yuan Chen, Meixian Cao, Meiling Feng, Qian Sun, Chang-Ping Yu: Recovery and purification of rare earth elements from wastewater and sludge using a porous magnetic composite of β-cyclodextrin and silica doped with PC88A. Separation and Purification Technology 266, 1 July 2021, 118589.
https://doi.org/10.1016/j.seppur.2021.118589
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