Highly selective cesium removal under acidic and alkaline conditions using a novel potassium aluminum thiostannate

Rapid and Selective Uptake of Radioactive Cesium from Water by a Microporous Zeolitic-like Sulfide

“…Recently, metal sulfides have emerged as new and promising ion exchangers for the remediation of radionuclides . In comparison to oxides, metal sulfides possess more flexible skeleton structures and the relatively soft Lewis basic sites S 2– or Se 2– , which give them an innate affinity for soft or relatively soft Lewis acid ions (e.g., Cs + , Sr 2+ , and [UO 2 ] 2+ ) . Particularly, significant progress has been evidenced by some layered compounds, such as Na 2 Sn 3 S 7 , K 2 x Sn 4– x S 8– x ( x = 0.65–1; KTS-3), K 2 x Mn x Sn 3– x S 6 ( x = 0.5–0.95; KMS-1), K 2 x Mg x Sn 3– x S 6 ( x = 0.5–1; KMS-2), K 0.48 Mn 0.76 PS 3 ·H 2 O (K-MPS-1), KInSnS 4 (InSnS-1), KATS-2, [(CH 3 ) 2 NH 2 ] 4/3 [(CH 3 ) 3 NH] 2/3 Sn 3 S 7 ·1.25H 2 O (FJSM-SnS-1), [CH 3 NH 3 ]­[Bmmim]­Sn 3 S 7 ·0.5H 2 O (FJSM-SnS-2), [(CH 3 ) 2 NH 2 ] 2 Ga 2 Sb 2 S 7 ·H 2 O (FJSM-GAS-1), and [CH 3 NH 3 ] 20 Ge 10 Sb 28 S 72 ·7H 2 O (GeSbS-2) .…”

Cation-Intercalated Lamellar MoS2 Adsorbent Enables Highly Selective Capture of Cesium

“…Among them, adsorption has drawn much attention due to its extra applicability to low concentration systems, good selectivity, high efficiency, and environmental compatibility. 19,20 Different kinds of adsorbents, such as clays, 21 Prussian blue analogues (PBAs), 20,22,23 ammonium phosphomolybdate (AMP), 18 metal sulfides, 24,25 and organic− inorganic composite materials, 26−29 have been widely studied. Among them, organic−inorganic composite adsorbents and metal sulfides are two types of appealing materials for Cs + capture and separation.…”

“…Another type of promising adsorbents metal sulfides, such as KMS-1 (K 2x Mn x Sn 3−x S 6 , x = 0.5−0.95), 34 KAlSnS-3 (K 1.83 Al 0.48 Sn 3 S 7.64 ), 24 and FJSM-SbS ([MeNH 3 ] 3 Sb 9 S 15 ), 35 have been paid a great deal of attention for the capture of Cs + or other metal ions, such as Co 2+ , UO 2 2+ , and rare-earth elements, from aqueous solution. 30,36−40 These types of materials benefit their abundant soft Lewis base S donors which exhibit high affinity for soft acids such as Cs + .…”

“…Another type of promising adsorbents metal sulfides, such as KMS-1 (K 2 x Mn x Sn 3– x S 6 , x = 0.5–0.95), KAlSnS-3 (K 1.83 Al 0.48 Sn 3 S 7.64 ), and FJSM-SbS ([MeNH 3 ] 3 Sb 9 S 15 ), have been paid a great deal of attention for the capture of Cs + or other metal ions, such as Co 2+ , UO 2 2+ , and rare-earth elements, from aqueous solution. ,− These types of materials benefit their abundant soft Lewis base S donors which exhibit high affinity for soft acids such as Cs + . , Additionally, compared to composite materials, the adsorption properties of layered materials could be easily improved by regulating their structures. For example, Chen and Yuan inserted organic amines into MXene to precisely regulate its interlayer spacing, thereby improving the ion transport rate and storage capacity.…”

“…Currently, various methods including precipitation, extraction, and adsorption , have been applied to the separation of Cs + . Among them, adsorption has drawn much attention due to its extra applicability to low concentration systems, good selectivity, high efficiency, and environmental compatibility. , Different kinds of adsorbents, such as clays, Prussian blue analogues (PBAs), ,, ammonium phosphomolybdate (AMP), metal sulfides, , and organic–inorganic composite materials, − have been widely studied. Among them, organic–inorganic composite adsorbents and metal sulfides are two types of appealing materials for Cs + capture and separation. , For example, the modified mangrove charcoal adsorbent studied by Hasan et al achieved 99% volume reduction through combustion of the adsorbent after 137 Cs adsorption.…”