Kinetics of Cesium and Strontium Ions Removal from Wastewater on Gel and Macroporous Resins

Controlled bi-functionalization of silica microbeads through grafting of amidoxime/methacrylic acid for Sr(II) enhanced sorption

“…These values are about one order of magnitude lower than the values rep orted for diffusivity o f S r(II) in sorbent based on titanium phosphate (i.e., 6 × 10 −10 m 2 min −1 ) [91] but several orders of magnitude higher than the effective diffusivity of Sr(II) into straw-derived char (5.4 × 10 −14 m 2 min −1 ) [92]. For macroporous resin, Sr(II) diffusivity was evaluated close to 1.2 × 1 0 −8 m 2 min −1 [93]. In the case of Dowex resins, Boyd and Soldano [94] identified the contribution of crosslinking ratio to the control of diffusion p rop erties (in the range: 1.37-2.03 × 10 −9 m 2 min −1 ); similar value was rep orted for Dowex 50 W-X8 resin (i.e., 1.17 × 10 −9 m 2 min −1 ) [95].…”

Selective Environmental Remediation of Strontium and Cesium Using Sulfonated Hyper-Cross-Linked Polymers (SHCPs)

“…137 Cs ( t 1/2 = 30.17 years) is a strong beta–gamma emitter, and 90 Sr ( t 1/2 = 28.8 years) is a beta emitter and a large source of radiation, having a specific activity of 5.21 TBq·g –1 . Cesium metabolically and chemically behaves similarly to potassium and sodium in terrestrial ecosystems, whereas strontium behaves analogously to calcium . It is estimated that 1.5 × 10 16 Bq of 137 Cs was released from the Fukushima Daiichi accident and 3.8 × 10 16 Bq from Chernobyl …”

“…In terms of solid-phase extractants, adsorbents based on ion-exchange have demonstrated good efficacy in the removal of these radionuclides from a variety of aqueous solutions. Examples of these are polymeric resins, , natural and synthetic zeolites, , titanates, silica, and titanosilicates . Inorganic ion-exchangers are more mechanically and thermally stable than their polymer counterparts, offer good resistance to radiolysis and have high capacity in many cases (>3 mequiv·g –1 ) .…”

“…3 Cesium metabolically and chemically behaves similarly to potassium and sodium in terrestrial ecosystems, whereas strontium behaves analogously to calcium. 4 It is estimated that 1.5 × 10 16 Bq of 137 Cs was released from the Fukushima Daiichi accident and 3.8 × 10 16 Bq from Chernobyl. 2 90 Sr releases were estimated much lower with activities of 4 × 10 155 and 3.5 × 10 13 Bq 6 for the Chernobyl and Fukushima Daiichi accidents, respectively.…”

Rapid Cs+ Capture via Multiple Supramolecular Interactions in Anionic Metal–Organic Framework Isomers

“…Various conventional techniques such as coagulation–flocculation–settling, liquid extraction, and ion exchange , have been developed for this task. The ion exchange method is the most common approach because of its low cost, ease of operation, and low production of secondary waste. , To date, several ion exchange materials and related compounds such as polymer resins, , zeolites, , vanadosilicate, metal chalcogenides, ,− ammonium phosphomolybdate–polyacrylonitrile (AMP–PAN), , crystalline silicotitanate (CST, IONSIV), − and hexacyanoferrates (Cstreat and Prussian blue) , have been developed.…”