Iodine capture with mechanically robust heat-treated Ag-Al-Si-O xerogel sorbents

Chong, Saehwa; Riley, Brian J.; Kuang, Wenbin; Olszta, Matthew J.

doi:10.1021/acsomega.1c00852

Title: Iodine capture with mechanically robust heat-treated Ag-Al-Si-O xerogel sorbents

Journal Article · Tue May 04 00:00:00 EDT 2021 · ACS Omega

DOI:https://doi.org/10.1021/acsomega.1c00852· OSTI ID:1788154

Chong, Saehwa ^[1];

^[1]; Kuang, Wenbin ^[1];

^[1]

BATTELLE (PACIFIC NW LAB)

Silver-loaded heat-treated aluminosilicate xerogels (Ag-HTX) were evaluated as sorbents for iodine [I2(g)] capture. The heat treatment step was performed to help increase the mechanical integrity of the gels. The synthesized xerogels were characterized using powder X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, Brunauer-Emmett-Teller analysis, gravimetric iodine loading, nanoindentation, and dynamic mechanical analysis. The structural and chemical analyses of Ag-HTX showed uniform distribution of Ag throughout the gel network after Ag-exchange. After I2(g) capture, the AgI crystallites were observed in the sorbent verifying chemisorption as the iodine capture mechanism. Iodine loading of this xerogel was 0.43 g g-1 at 150°C over 1 d and 0.52 g g-1 at 22°C over 33 d. The specific surface area of Ag-HTX was 202 m2 g-1 and decreased to 87 m2 g-1 after iodine loading. The hardness of the heat-treated xerogel was 160 times higher than heat-treated aerogel of the same composition. The heat-treatment process increased the modulus value to 40.77 MPa from 6.99 MPa of as-made xerogel, demonstrating the need for this added step in the synthesis process. These results show that Ag-HTX is a promising sorbent for I2(g) capture with good loading capacity and mechanical stability.

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

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1788154

Report Number(s):: PNNL-SA-158388

Journal Information:: ACS Omega, Vol. 6, Issue 17

Country of Publication:: United States

Language:: English

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