Synthesis of sorbents based on coarsely dispersed silica gel, containing nanoparticles of Ag compounds, for localization of volatile radioactive iodine compounds from the water vapor-air medium

Porous sorbents for the capture of radioactive iodine compounds: a review

“…Oxidetype materials such as alumina (Al 2 O 3 ) and silica (SiO 2 ) that are impregnated with silver, which are designated as Ag/Al 2 O 3 and Ag/SiO 2 , respectively, are another class of adsorbents that can be found in the literature. These materials have been the focus of various studies 19,35,52,61,65,70,[87][88][89][90][91][92][93][94][95][96][97] and have been used for the capture of iodine (I 2 ) on an industrial scale. 65,[88][89][90]96 These adsorbents, which contain silver nitrate (AgNO 3 ), proved their efficiency for the elimination of iodine (I 2 ) and iodomethane (CH 3 I) in a spent fuel reprocessing plant.…”

“…for a better understanding of iodine capture and its performance. [74][75][76][77][78][79][80][81] In addition, new porous sorbents have been added to the list of potential sorbents for iodine trapping, including titanosilicates, 82,83 mesoporous silicas, 6,81,[84][85][86] silverimpregnated silica and alumina (Ag/SiO 2 and Ag/Al 2 O 3 , respectively), 19,35,52,61,65,70,[87][88][89][90][91][92][93][94][95][96][97] silver-functionalized aerogels, chalcogels, 7,98-108 macroreticular ion exchange resins, 16,39,41,42,[44][45][46]50,53,55 metal-and covalent-organic frameworks (MOFs and COFs, respectively) 6,14, and porous organic polymers (POPs). [133][134][135]…”

Recent advances in the removal of radioactive iodine by bismuth-based materials

“…However, the thermal stability of activated carbon is poor, and its adsorption capacity is diminished at the operating temperature of spent fuel processing. Silver-based materials have been widely studied in iodine capture because silver can react with iodine to generate insoluble AgI ( Kikuchi et al, 1978 ; Kindel et al, 1993 ; Sakurai and Takahashi, 1994 ; Funabashi et al, 1995 ; Modolo and Odoj, 1997 ; Mineo et al, 2002 ; Mineo et al, 2003 ; Takeshita and Azegami, 2004 ; Tanabe et al, 2010 ; Kulyukhin et al, 2012 ). Although silver-based materials have excellent performance in capturing ability and stability, the high cost and toxic of silver make it necessary to explore alternatives.…”