The development of low-cost and high-efficiency iodine sorbents is of great significance for the control of nuclear pollution. In this work, we intercalate the tin sulfide cluster of [SnS] to Mg/Al-type layered double hydroxides to obtain SnS-LDH, which exhibits highly efficient capture performance of iodine vapor and iodine in solutions. The dispersion effect of the positively charged LDH layers contributes to the adequate exposure of [SnS] anions, providing plentiful adsorption sites. For iodine vapor, SnS-LDH showed an extremely large iodine capture capacity of 2954 mg/g with a large contribution from physisorption. For iodine in solutions, a significantly large sorption capacity of 1308 mg/g was achieved. During iodine capture, I molecules were reduced to I ions (by S in [SnS]), which then reacted with Sn to form SnI, where the molar amount of captured iodine is 4-fold that of Sn. Besides, the as-reduced I combined with I again to generate [I], which then entered the LDH interlayers to maintain electric neutrality. While reducing iodine, S itself in [SnS] was oxidized to S, which further combined with SnI to form a novel compound of SnI(S). The excellent iodine capture capability endows SnS-LDH with a promising application in trapping radioactive iodine.
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http://dx.doi.org/10.1021/acsami.3c11367 | DOI Listing |
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