Iodine Capture by Ag-Loaded Solid Sorbents Followed by Ag Recycling and Iodine Immobilization: An End-to-End Process

Yadav, Anjali; Chong, Saehwa; Riley, Brian J.; McCloy, John S.; Goel, Ashutosh

doi:10.1021/acs.iecr.2c04357

Iodine Capture by Ag-Loaded Solid Sorbents Followed by Ag Recycling and Iodine Immobilization: An End-to-End Process

Journal Article · Fri Feb 17 00:00:00 EST 2023 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/acs.iecr.2c04357· OSTI ID:1985805

Yadav, Anjali ^[1]; ^[2]; ^[2]; ^[3]; ^[1]

Rutgers Univ., Piscataway, NJ (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Washington State Univ., Pullman, WA (United States)

Here, this article demonstrates the complete process of I_2(g) capture using Ag-exchanged faujasite (AgX) and Ag-exchanged mordenite (AgZ) zeolite sorbents, the recovery of Ag for recyclability of iodine capture, and the immobilization of iodide (from the elution process) into an iodosodalite waste form, which is chemically and environmentally stable. The gaseous iodine, I_2(g), was captured in the AgX via chemisorption by Ag and converted to AgI within the aluminosilicate zeolite frameworks. The elution reaction in Na₂S resulted in the precipitation of Ag₂S and dissolution of I^– and Na⁺ into the aqueous solution, where powdered sorbent showed higher conversion efficiency than the granular form, which is attributed to Na₂S-solution diffusion limitations in the granules. The Ag₂S-containing aluminosilicate precipitates were filtered out of the solution, and the filtrate (aqueous solution) was used to synthesize iodosodalite to immobilize iodide. The iodine capture using the recovered Ag₂S-containing sorbents shows equivalent iodine loadings to the AgX starting material of Q_e = 0.355 g/g for powdered material and 0.255 g/g for granular material, demonstrating the potential recycling of Ag for iodine capture as Ag₂S-based sorbents.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: AC05-76RL01830; NE0008964

OSTI ID:: 1985805

Report Number(s):: PNNL-SA-179871

Journal Information:: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 8 Vol. 62; ISSN 0888-5885

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Iodine Capture by Ag-Loaded Solid Sorbents Followed by Ag Recycling and Iodine Immobilization: An End-to-End Process

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