A two-dimensionally microporous thiostannate with superior Cs⁺ and Sr²⁺ ion-exchange property

Abstract

The removal of highly radioactive and long-lived 137 Cs + and 90 Sr 2+ from solution is of significance for radionuclide remediation. Herein we prepared a two-dimensionally microporous thiostannate, namely (Me 2 NH 2 ) 4/3 (Me 3 NH) 2/3 Sn 3 S 7 $1.25H 2 O (FJSM-SnS), and systematically investigated its Cs + and Sr 2+ ionexchange performance in different conditions. The structural stabilities and variation, ion-exchange kinetic and isothermal behavior, pH-dependent distribution coefficients (K d ), ion-exchange in simulated groundwater and ion-exchange applied to chromatography have been investigated. The results indicated that the maximum Cs + and Sr 2+ ion-exchange capacities of FJSM-SnS were 408.91 mg g À1 and 65.19 mg g À1 , respectively. In particular, FJSM-SnS showed quick ion-exchange ability and wide pH resistance (0.7-12.7) which make it outstanding among the ion-exchangers. An ion-exchange chromatographic column was firstly studied for chalcogenido ion-exchange materials, that is, a column filled with 3.0 g FJSM-SnS could remove 96-99% of Cs + ion and near 100% of Sr 2+ ion at low ionic concentrations in 900 bed volumes solutions. Furthermore, the title material could be synthesized on a large scale by a facile, one-pot and economical solvothermal method. The relatively low cost but remarkable ion-exchange performance makes it promising for radionuclide remediation. † Electronic supplementary information (ESI) available: Crystallographic data for FJSM-SnS and FJSM-SnS-Cs in CIF format, TG-MS spectra, mass spectra of solution and solvent, PXRD, EDS, the kinetics studies at room temperature, IR and table of data in the simulated groundwater, competitive ion-exchange experiments and the ion-exchange chromatographic column experiment. CCDC 1025383 and 1025384. For ESI and crystallographic data in CIF or other electronic format see

Light absorption engineering of a hybrid (Sn3S72−)n based semiconductor – from violet to red light absorption

“…waste. A member of the R-SnS-1 family templated by Me 2 NH 2 + and Me 3 NH + has shown Cs + and Sr 2+ exchange capacities of 409 mg g −1 and 65 mg g −1 , respectively, at 338 K41. The latter is similar to what we observed for MB, even though the molar exchange ratio is higher for Sr 2+ when the molar mass difference between MB and Sr 2+ is taken into account.…”

“…The Langmuir adsorption is in good agreement with the findings by Qi et al . for Cs + and Sr 2+ exchange in (Me 2 NH 2 ) 4/3 (Me 3 NH) 2/3 Sn 3 S 7 ·1.25H 2 O41.…”

“…Functionalization by ion exchange has been widely applied for layered materials including layered double hydroxides (LDHs)28 and three-dimensional compounds such as metal-organic frameworks (MOFs)29. Comparatively little has still been done in this area for R-SnS-1 type compounds, where the main focus has been on ion exchange by alkali-, alkali earth- or transition metal ions24303132. Furthermore, it has been proven that the organic cation tert-butyl ammonium (TBA) can be replaced by tetramethylammonium (TMA) while keeping the framework intact25.…”

Syntheses, Crystal Structures, Ion-Exchange, and Photocatalytic Properties of Two Amine-Directed Ge–Sb–S Compounds

“…1c,e,f Meanwhile, most of the efficient ion-exchangers have suitable channel size or interlayer spacing, which enable the guest cations to diffuse in and out of the material. 1,6h, 15,16 To the best of our knowledge, the supreme selectivity and capacity of compound 1 for specific ions such as Cs + may be mainly ascribed to its soft basic framework structure with channels of particular size and shape. 1c,d,f The lower ion-exchange capacity of 1 for the smaller alkali metal ions, such as Rb + , K + , and Na + , is believed to be due to their larger hydrated spheres.…”

Organically modified clay with potassium copper hexacyanoferrate for enhanced Cs+ adsorption capacity and selective recovery by flotation

“…Ion exchange by selective adsorbent is a proven route to separate Cs + from aqueous environments, forming a concentrated waste more suitable for disposal. Accordingly, a series of inorganic Cs + adsorbents have been developed, among which zeolites 4 , crystalline silicotitanate 5,6 , vanadosilicate 7 and chalcogenides 2,8,9 , have been studied in detail due to high Cs + selectivity and excellent removal efficiencies. Nevertheless, the complexity of synthesis and cost-inefficiency greatly limit application for large-scale nuclear waste clean-up and remediation.…”