Polyacrylonitrile composites of Ag-Al-Si-O aerogels and xerogels as iodine and iodide sorbents
Mechanically robust engineered sorbents were constructed by embedding Ag-loaded aerogels or xerogels in a polyacrylonitrile (PAN) matrix at 30 or 50 mass% loadings of gel in PAN. The process for making the base gels as well as the composite materials is described herein, a technology that is very flexible for making hybrid sorbents using various inorganic or organic active sorbents. The PAN-gel composite materials were evaluated for iodine uptake in the form of gaseous iodine [I2(g)] at room temperature and at 150°C as well as iodide (I–) at room temperature from simulated liquid nuclear wastes. The composites show high I2(g) uptake and high I– uptake (= 93 mass%) in simulated liquid secondary waste spiked with 5 mg L-1 I–. These results demonstrate the utility of such a composite form for iodine removal from contaminated gas and liquid streams.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1818132
- Report Number(s):
- PNNL-SA-158597
- Journal Information:
- ACS Applied Polymer Materials, Vol. 3, Issue 7
- Country of Publication:
- United States
- Language:
- English
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