Silica-Based Adsorbents With Immobilized Derivatives of Phosphonic, Hydroxamic and Pyridinecarboxylic Acids for Dispersive Solid Phase Extraction and Separation of Rare Earth Elements

Abstract

recycling of rare earth elements from electronic waste. It was demonstrated that SiO2-PdCA can be used for selective recovery of rare earth elements (Y, Eu, Tb) from waste fluorescent lamps. SiO2-PdCA demonstrates high selectivity that allows complete (>95%) recovery of all REE in the presence of 50-fold excess of Ba 2+ ions that is used for analytical determination of REE traces by ICP-MS. Also, SiO2-PdCA is useful for selective adsorption of REE from environmental objects since 200-fold excess of such ions as