Powders of a Sn2S3 chalcogen-based aerogel (chalcogel) were combined with powdered polyacrylonitrile (PAN) in different mass ratios (SnS33, SnS50, and SnS70 in mass% of chalcogel), dissolved into dimethyl sulfoxide, and dropped into deionized water to form pellets of a porous PAN-chalcogel hybrid material. Pellets of these hybrid sorbents, along with pure powdered (SnSp) and granular (SnSg) forms of the chalcogel, were then used to adsorb iodine gas under both concentrated and dilute conditions. Both the SnSp and SnSg chalcogels showed very high maximum iodine loadings at 67.2 and 68.3 mass%. The maximum iodine loadings in the SnS33 and SnS50 were high at 32.8 and 53.5 mass%. In all cases, X-ray diffraction results showed the formation of Sn-I phases of SnI4 and SnI4(S8)2 revealing that the iodine binding in these materials is mainly due to a chemisorption process although some evidence also exists that supports a physisorption process.
Revised: May 20, 2014 |
Published: April 16, 2014
Citation
Riley B.J., D.A. Pierce, J. Chun, J. Matyas, W.C. Lepry, T. Garn, and J. Law, et al. 2014.Polyacrylonitrile-Chalcogel Hybrid Sorbents for Radioiodine Capture.Environmental Science & Technology 48, no. 10:5832-5839.PNNL-SA-99817.doi:10.1021/es405807w