Pemanfaatan Deep Eutectic Solevents dalam Pemisahan Logam Tanah Jarang

Abstract

Deep Eutectic Solvents (DES) merupakan pelarut hijau yang berpotensi digunakan untuk ekstraksi logam tanah jarang (LTJ). Penelitian ini bertujuan mensintesis DES berbasis guanidin serta mengevaluasi kinerjanya dalam pemisahan LTJ. Karakterisasi dilakukan menggunakan FTIR, spektroskopi Raman, dan uji viskositas, sedangkan konsentrasi logam dianalisis dengan X-ray Fluorescence (XRF). Hasil FTIR dan Raman mengonfirmasi terbentuknya DES melalui interaksi ikatan hidrogen antara hydrogen bond acceptor HBA dan HBD. DES guanidin:gliserol memiliki viskositas tertinggi (720 cP), diikuti guanidin:asam laktat dan guanidin:etilen glikol (80 cP). Hasil ekstraksi menunjukkan bahwa guanidin:gliserol memberikan persen ekstraksi tertinggi untuk La (95,89%) dan Nd (93,63%), sedangkan guanidin:asam laktat tertinggi untuk Ce (93,55%). Hasil penelitian menunjukkan bahwa variasi HBD memengaruhi karakteristik DES dan efisiensi ekstraksi LTJ.

Deep Eutectic Solvents (DES) are green solvents that have the potential to be used for the extraction of rare earth metals (REEs). This study aims to synthesize guanidine-based DES and evaluate its performance in the separation of REEs. Characterization was carried out using FTIR, Raman spectroscopy, and viscosity tests, while metal concentrations were analyzed by X-ray Fluorescence (XRF). FTIR and Raman results confirmed the formation of DES through hydrogen bond interactions between hydrogen bond acceptors HBA and HBD. guanidine:glycerol DES has the highest viscosity (720 cP), followed by guanidine:lactic acid and guanidine:ethylene glycol (80 cP). The extraction results showed that guanidine:glycerol gave the highest extraction percentage for La (95.89%) and Nd (93.63%), while guanidine:lactic acid was the highest for Ce (93.55%). The results showed that variations in HBD affected the DES characteristics and the extraction efficiency of REEs.