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Mechanistic investigation of intensified separation of molybdenum(VI) and vanadium(V) using polymer inclusion membrane electrodialysis
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2023-05-22 , DOI: 10.1016/j.jhazmat.2023.131671
Yuzhen Wang 1 , Pengfei Wang 1 , Huihui Xie 1 , Ming Tan 1 , Lingyun Wang 2 , Yang Liu 1 , Yang Zhang 1
Affiliation  

The main challenge in separating molybdenum(VI) and vanadium(V) which have similar properties results in great difficulties in the green recycling of hazardous spent catalysts. Here, selective facilitating transport and stripping are integrated into the polymer inclusion membrane electrodialysis process (PIMED) to separate Mo(VI) and V(V) to overcome the complicated co-extraction and stepwise-stripping in conventional solvent extraction. The influences of various parameters, the selective transport mechanism, and respective activation parameters were systematically investigated. Results revealed that the affinity of the Aliquat 36 as the carrier and PVDF-HFP as the base polymer of PIM towards Mo(VI) is stronger than that of V(V), while the strong interaction between Mo(VI) and carrier caused low migration through the membrane. By the combination of adjusting and controlling the electric density and strip acidity, the interaction was destroyed and the transport was facilitated. After optimization, stripping efficiencies of Mo(VI) and V (V) increased from 44.4% to 93.1% and reduced from 31.9% to 1.8%, respectively, while their separation coefficient increased 16.3 times to 333.4. The activation energy, enthalpy and entropy for the transport of Mo(VI) were determined to be 4.846 kJ mol−1, 6.745 kJ mol−1 and − 310.838 J mol−1 K−1, respectively. The present work demonstrates that the separation of similar metal ions could be improved by fine tuning the affinity and interaction between metal ions and the PIM, thus providing new insights into the recycling of similar metal ions from secondary resources.



中文翻译:

聚合物包合物膜电渗析强化分离钼(VI)和钒(V)的机理研究

分离具有相似性质的钼(VI)和钒(V)的主要挑战导致危险废催化剂的绿色回收面临很大困难。在这里,选择性促进传输和剥离被集成到聚合物包合物膜电渗析过程 (PIMED) 中以分离 Mo(VI) 和 V(V),以克服传统溶剂萃取中复杂的共萃取和逐步剥离。系统地研究了各种参数、选择性转运机制和各自的激活参数的影响。结果表明,Aliquat 36 作为载体和 PVDF-HFP 作为 PIM 的基础聚合物对 Mo(VI) 的亲和力强于 V(V),而 Mo(VI) 与载体之间的强相互作用导致低通过膜迁移。通过调控电密度和条带酸度相结合,破坏了相互作用,促进了输运。优化后,Mo(VI)和V(V)的剥离效率分别从44.4%提高到93.1%,从31.9%降低到1.8%,分离系数提高16.3倍,达到333.4。Mo(VI) 传输的活化能、焓和熵被确定为 4.846 kJ mol-1、6.745 kJ mol -1和- 310.838 J mol -1 K -1。目前的工作表明,可以通过微调金属离子与 PIM 之间的亲和力和相互作用来改善相似金属离子的分离,从而为从二次资源中回收相似金属离子提供新的见解。

更新日期:2023-05-25
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