Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Development of state-of-the-art selective adsorbent materials for recovery rare earth elements (REEs) is essential their sustainable usage. In this study, a metal-organic framework (MOF), MIL-101(Cr), was synthesized and post-synthetically modified with optimised loading the organophosphorus compounds tributyl phosphate (TBP), bis(2-ethylhexyl) hydrogen (D2EHPA, HDEHP) bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex®-272). The were characterized adsorption efficiency towards Nd3+, Gd3+ Er3+ from aqueous solutions investigated. MOF derivatives demonstrated an increase in capacity at optimal pH 5.5 order MIL-101-T50 (37.2 mg g?1) < MIL-101-C50 (48.9 MIL-101-H50 (57.5 g?1). exceptional selectivity against transition metal ions over 90%, up to 95% mixtures ions. better chemical stability than 3 adsorption?desorption cycles. mechanism described by formation coordinative complexes between functional groups modifiers