Preparation and application of supported ionic liquid phases for sorption of Pt(IV) from chloride solution
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ORIGINAL PAPER
Preparation and application of supported ionic liquid phases for sorption of Pt(IV) from chloride solution Thuy T. L. Bui1 · Ha T. N. Uong2,3,4 · Ngoc C. Pham5 · Duy K. Nguyen1 · Son Ngo1 · Binh T. Nguyen6 Received: 20 May 2020 / Accepted: 17 August 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract Four ionic liquids (ILs) 1-methyl-3-tetradecylimidazolium chloride ( [C14MIM]Cl), 1-n-butyl-3-n-butylimidazolium chloride ([C4BIM]Cl), 1-n-butyl-3-n-tetradecylimidazolium chloride ([C14BIM]Cl), and 1-tetradecylpyridinium chloride ( [C14Py]Cl) were synthesized. Sorbents in nature of supported ionic liquid phases (SILPs) were prepared by impregnating ILs on solid carriers such as silica gel, XAD-7 and XAD-4 Amberlite ion exchange resins. Pt(IV) was recovered using these sorbents with the yields over 90%, however, the amounts of used ILs are much less than those of ILs used in extraction method and the process can easily be transferred to heterogeneous phase. The Pt(IV) sorption is affected by the structure of ILs and solid carriers, the IL loading, and IL/Pt molar ratio. The highest sorption yields were observed when using [C14MIM]Cl-based SILPs. Moreover, the sorption isotherms of [ C14MIM]Cl/SiO2 SILPs with different IL loadings and IL/Pt molar ratios were investigated and sorption mechanism was also proposed. Keywords Ionic liquid · Sorption · Recovery of Pt(IV) · Sorption isotherms · Supported ionic liquid phase
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11696-020-01328-6) contains supplementary material, which is available to authorized users. * Thuy T. L. Bui [email protected]; [email protected] 1
Oil Refining and Petrochemistry Department, Hanoi University of Mining and Geology, 18‑Vien, Duc Thang, Bac Tu Liem, Hanoi, Vietnam
2
Chemistry Department, Ho Chi Minh University of Medicine and Pharmacy, 227 Hong Bang, Ho Chi Minh City, Vietnam
3
Institute of Chemistry, Vietnam Academy of Sciences and Technology, 18‑Hoang Quoc Viet, Nghia Đo, Cau Giay, Hanoi, Vietnam
4
Institute of Chemical Technology, Vietnam Academy of Sciences and Technology, 1‑Mac Dinh Chi Street, Ho Chi Minh City, Vietnam
5
High School for Gifted Students, Ha Noi National University of Education, 136 ‑ Xuan Thuy, Cau Giay, Hanoi, Vietnam
6
Chemistry Department, University of Natural Science, Hanoi National University, 334‑Nguyen Trai, Thanh Xuan, Hanoi, Vietnam
Spent catalysts from oil refinery plants and catalytic converters of automobiles containing a large amount of precious metals mainly platinum while their resources are currently limited. Therefore, the recovery of platinum from these spent catalysts shows environmental and economic significance (Sun and Lee 2013). During recovering process, platinum need to be separated from its leaching solution. In this step, metals can be recovered by several methods such as liquid–liquid extraction (Rzelewska-Piekut and RegelRosocka 2019; Yamada et al
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