Polyacrylonitrile-Chalcogel Hybrid Sorbents for Radioiodine Capture

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• 作者：Brian J. Riley ; David A. Pierce ; Jaehun Chun ; Josef Maty谩拧 ; William C. Lepry ; Troy G. Garn ; Jack D. Law ; Mercouri G. Kanatzidis
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：May 20, 2014
• 年：2014
• 卷：48
• 期：10
• 页码：5832-5839
• 全文大小：460K
• 年卷期：v.48,no.10(May 20, 2014)
• ISSN：1520-5851

文摘

Powders of a Sn₂S₃ chalcogen-based aerogel (chalcogel) were combined with powdered polyacrylonitrile (PAN) in different mass ratios (SnS₃₃, SnS₅₀, and SnS₇₀; # = mass% of chalcogel), dissolved in dimethyl sulfoxide, and added dropwise to deionized water to form pellets of a porous PAN-chalcogel hybrid material. These pellets, along with pure powdered (SnS_p) and granular (SnS_g) forms of the chalcogel, were then used to capture iodine gas under both dynamic (dilute) and static (concentrated) conditions. Both SnS_p and SnS_g chalcogels showed very high iodine loadings at 67.2 and 68.3 mass%, respectively. The SnS₅₀ hybrid sorbent demonstrated a high, although slightly reduced, maximum iodine loading (53.5 mass%) with greatly improved mechanical rigidity. In all cases, X-ray diffraction results showed the formation of crystalline SnI₄ and SnI₄(S₈)₂, revealing that the iodine binding in these materials is mainly due to a chemisorption process, although a small amount of physisorption was observed.