Efficient Separation and Enrichment of Rubidium in Salt Lake Brine Using High-Performance PAN-KCuFC-PEG Adsorption Composite
Salt lake brine contains abundant rubidium resources; however, the separation of rubidium from brine with a high K content remains a significant challenge in metallurgical processes and materials science. In this study, PAN-KCuFC-PEG particles were synthesized by phase transformation, using hydrophi...
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2025-03-01
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| Series: | Molecules |
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| author | Linhong Wu Kun Zhou Yuchen Zheng Ying Zeng Guangyong Zeng Ziyi Cheng Yang Peng |
| author_facet | Linhong Wu Kun Zhou Yuchen Zheng Ying Zeng Guangyong Zeng Ziyi Cheng Yang Peng |
| author_sort | Linhong Wu |
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| description | Salt lake brine contains abundant rubidium resources; however, the separation of rubidium from brine with a high K content remains a significant challenge in metallurgical processes and materials science. In this study, PAN-KCuFC-PEG particles were synthesized by phase transformation, using hydrophilic polyacrylonitrile (PAN) as the skeleton structure, potassium cupric ferricyanide (KCuFC) as the active component and water-soluble polymer polyethylene glycol (PEG) as the pore regulator. Characterization revealed that the addition of PEG increased the pore volume of PAN-KCuFC-PEG by 63% and the BET surface area by 172%. KCuFC powder was uniformly dispersed in PAN-KCuFC-PEG, and its crystal structure remained stable after loading. In static adsorption experiments, the maximum adsorption capacity of PAN-KCuFC-PEG for Rb<sup>+</sup> reached 190 mg/g. The adsorption behavior followed a pseudo-second-order kinetic model, with the rate jointly controlled by external diffusion, intraparticle diffusion, and chemical reaction. In the column experiment, PAN-KCuFC-PEG was used to adsorb Qarhan Salt Lake brine (K: 26,000 mg/L, Rb: 65 mg/L). NH<sub>4</sub>Cl was employed for elution and desorption of PAN-KCuFC-PEG. During the adsorption–desorption process, the separation factor between Rb and K reached 160, the desorption rate reached 96.6%, and the overall yield was 68.3%. The enrichment and separation of Rb were successfully achieved. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-03-01 |
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| spelling | doaj-art-4be75ecb3ec54cab9e892c9b6267c62f2025-08-20T03:43:14ZengMDPI AGMolecules1420-30492025-03-01306127310.3390/molecules30061273Efficient Separation and Enrichment of Rubidium in Salt Lake Brine Using High-Performance PAN-KCuFC-PEG Adsorption CompositeLinhong Wu0Kun Zhou1Yuchen Zheng2Ying Zeng3Guangyong Zeng4Ziyi Cheng5Yang Peng6School of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, ChinaSchool of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, ChinaSchool of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, ChinaSchool of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, ChinaSchool of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, ChinaSchool of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, ChinaSchool of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, ChinaSalt lake brine contains abundant rubidium resources; however, the separation of rubidium from brine with a high K content remains a significant challenge in metallurgical processes and materials science. In this study, PAN-KCuFC-PEG particles were synthesized by phase transformation, using hydrophilic polyacrylonitrile (PAN) as the skeleton structure, potassium cupric ferricyanide (KCuFC) as the active component and water-soluble polymer polyethylene glycol (PEG) as the pore regulator. Characterization revealed that the addition of PEG increased the pore volume of PAN-KCuFC-PEG by 63% and the BET surface area by 172%. KCuFC powder was uniformly dispersed in PAN-KCuFC-PEG, and its crystal structure remained stable after loading. In static adsorption experiments, the maximum adsorption capacity of PAN-KCuFC-PEG for Rb<sup>+</sup> reached 190 mg/g. The adsorption behavior followed a pseudo-second-order kinetic model, with the rate jointly controlled by external diffusion, intraparticle diffusion, and chemical reaction. In the column experiment, PAN-KCuFC-PEG was used to adsorb Qarhan Salt Lake brine (K: 26,000 mg/L, Rb: 65 mg/L). NH<sub>4</sub>Cl was employed for elution and desorption of PAN-KCuFC-PEG. During the adsorption–desorption process, the separation factor between Rb and K reached 160, the desorption rate reached 96.6%, and the overall yield was 68.3%. The enrichment and separation of Rb were successfully achieved.https://www.mdpi.com/1420-3049/30/6/1273salt lake brinerubidiumadsorption and purificationchromatographypolyethylene glycol |
| spellingShingle | Linhong Wu Kun Zhou Yuchen Zheng Ying Zeng Guangyong Zeng Ziyi Cheng Yang Peng Efficient Separation and Enrichment of Rubidium in Salt Lake Brine Using High-Performance PAN-KCuFC-PEG Adsorption Composite Molecules salt lake brine rubidium adsorption and purification chromatography polyethylene glycol |
| title | Efficient Separation and Enrichment of Rubidium in Salt Lake Brine Using High-Performance PAN-KCuFC-PEG Adsorption Composite |
| title_full | Efficient Separation and Enrichment of Rubidium in Salt Lake Brine Using High-Performance PAN-KCuFC-PEG Adsorption Composite |
| title_fullStr | Efficient Separation and Enrichment of Rubidium in Salt Lake Brine Using High-Performance PAN-KCuFC-PEG Adsorption Composite |
| title_full_unstemmed | Efficient Separation and Enrichment of Rubidium in Salt Lake Brine Using High-Performance PAN-KCuFC-PEG Adsorption Composite |
| title_short | Efficient Separation and Enrichment of Rubidium in Salt Lake Brine Using High-Performance PAN-KCuFC-PEG Adsorption Composite |
| title_sort | efficient separation and enrichment of rubidium in salt lake brine using high performance pan kcufc peg adsorption composite |
| topic | salt lake brine rubidium adsorption and purification chromatography polyethylene glycol |
| url | https://www.mdpi.com/1420-3049/30/6/1273 |
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