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Efficient and simultaneous capture of iodine and methyl iodide achieved by a covalent organic framework

“…Compared with traditional liquid scrubbing processes to capture radioactive iodine, adsorption-based processes require a simpler operation and lower maintenance costs and avoid highly corrosive solutions 6 . Therefore, researchers have increasingly focused on the development of various adsorbents for iodine capture, including materials containing silver (Ag) 12 – 14 , ceramics 13 , 15 , 16 , zeolites 17 , 18 , aerogels 19 – 21 , metal-organic frameworks 8 , 22 – 26 , and conjugated polymers 27 – 31 . Most of these studies have focused on the adsorption capacity of the developed adsorbent for I 2 , whereas only a few studies have addressed the capture of CH 3 I, and even fewer studies have examined the simultaneous capture of I 2 and CH 3 I.…”

28 Radiochemistry

“…A heavier isotope, antimony-125, results 38 from the neutron irradiation of tin-124. Another by-product of the purification of molybdenum-99 is iodine-131, if silver coated alumina is used 39 to extract these isotopes from alkaline solution. Radiochemical procedures have been described for the production of carrier-free lutetium-177 40 [ 176 Yb(n,c) 177 Lu] and tungsten-178 41 [natural Hf(a,2n) 178 W].…”

“…Many quite specific methods have been developed for the removal of particular isotopes. Thus it has been reported that silver-coated alumina 39 will remove fission iodine from solution, that uranium in sea water can be selectively adsorbed onto amidoxime resins 229 and that neptunium is adsorbed onto hydroxyapatite, 230 whilst technetium 231 and molybdenum 232 can be removed from reprocessing waste by ionexchange. Ion-exchange has also been used to separate plutonium 233 and thorium 234 from uranium in nitric acid solution.…”

Capture of iodine and organic iodides using silica zeolites and the semiconductor behaviour of iodine in a silica zeolite

“…[1][2][3] The active components of the solid sorbent mixtures used in fixed bed methods are silver nanoparticles (Ag 0 ), silver ion (Ag + ) or silver nitrate (AgNO 3 ), which are supported on various solid supports including silica, alumina, zeolites, and activated carbon (denoted as AC). [1][2][3][4][5][6][7] The silver species capture radioactive I 2 and RI by promoting their conversion to water insoluble AgI or AgIO 3 through the reactions displayed in eqn (1)- (6). 7 I 2 + 2Ag 0 -2AgI…”

“…RI + Ag + + NO 3 À -RNO 3 + AgI (6) The temperature of the off-gas is usually ca. 150 1C in order to accelerate the chemical reactions and remove adsorbed water from the narrow pores of the support.…”