Recovery of platinum group metals using magnetic nanoparticles modified with ionic liquids

• Published in: Separation and purification technology 2020-10, Vol.248, p.117049, Article 117049
• Main Authors: Mokhodoeva, Olga, Shkinev, Valery, Maksimova, Valeriia, Dzhenloda, Rustam, Spivakov, Boris
• Format: Article
• Language: English
• Subjects: Aqueous biphasic systems; Ionic liquids; Magnetic nanoparticles; Magnetic solid-phase extraction; Platinum metals
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2020.117049

[Display omitted] •Recovery of platinum metal ions from a model technological solution is described.•The synthesized Fe3O4@PEG@IL nanoparticles are characterized.•Phosphonium and imidazolium types of ionic liquids were studied as modifying agents. The development of a principally new approach to preparation of IL-modified magnetic nanoparticles and their application as sorbent materials for recovery of platinum group metals from model technological solutions are described. The formation of Fe3O4 nanoparticles, their simultaneous coating with a polymer shell and an ionic liquid are implemented in aqueous biphasic systems by a single step synthesis. Different ionic liquids have been tested as modifying agents: Cyphos® IL 101, Cyphos® IL 110, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, 1-octyl-3-methylimidazolium hexafluorophosphate. The prepared magnetic nanoparticles have been characterized by scanning and transmission electron microscopy, X-ray diffraction, thermogravimetric analysis and applied as sorbents for magnetic solid-phase extraction of platinum metals from chloride solutions. The results indicate that the recovery of the platinum metals from (0.1 M HCl + 1 M NaCl) solution is 99% for Pd(II) and 98% for Pt(IV) within 30 min and their quantitative stripping can be achieved using 2 M HNO3 solution.