Co2+/PMS based sulfate-radical treatment for effective mineralization of spent ion exchange resin

• Published in: Chemosphere (Oxford) Vol. 287; p. 132351
• Main Authors: Hafeez, Muhammad Aamir, Hong, Seok Ju, Jeon, Junsung, Lee, Juhyeok, Singh, Bhupendra Kumar, Hyatt, Neil C., Walling, Samuel A., Heo, Jong, Um, Wooyong
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2022
• Subjects: Advance oxidation process; Cobalt; Mineralization; Peroxymonosulfate; Spent ion exchange resin; Sulfate radical; Spent ion exchange resin; Sulfate radical; Advance oxidation process; Peroxymonosulfate; Mineralization; Cobalt
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2021.132351

Sulfate radical advance oxidation processes (SR-AOPs) have attracted a greater attention as a suitable alternative of the hydroxyl radical based advance oxidation process (HR-AOPs). In this study, for the first time we report liquid phase mineralization of nuclear grade cationic IRN-77 resin in Co2+/peroxymonosulfate (PMS) based SR-AOPs. After the dissolution of cationic IRN-77 resin, 30 volatile and 15 semi-volatile organic compounds were analyzed/detected using non-targeted GC-MS analysis. The optimal reaction parameters for the highest chemical oxygen demand (COD) removal (%) of IRN-77 resin were determined, and the initial pH, PMS dosage, and reaction temperature were found to be the most influential parameters for the resin degradation. We successfully achieved ∼90% COD removal (1000 mg/L; 1000 ppm) of dissolved spent resin for SR-AOPs by optimizing the reaction parameters as initial pH = 9, Co2+ = 4 mM (catalyst), PMS = 60 mM (as oxidant) at 60 °C temperature for 60 min reaction. The electron spin resonance spectroscopy (ESR) spectra confirmed the presence of SO4∙- and OH∙ as main reactive species in the Co2+/PMS resin system. In addition, Fourier transform infrared spectroscopy (FT-IR) analyses were used for structural characterization of solid and liquid phase resin samples. We believe that this work will offer a robust approach for the effective treatment of spent resin generated from nuclear industry. [Display omitted] •100% dissolution of IRN-77 resin was achieved.•GC-MS analysis confirmed 30 volatile & 15 semi-volatile compounds.•Co2+/PMS system was highly efficient for mineralization of IRN-77 resin.•ESR analysis also confirmed SO4∙- &∙OH radicals in Co2+/PMS system.