Highly selective cesium(I) capture under acidic conditions by a layered sulfide

Abstract

Radiocesium remediation is desirable for ecological protection, human health and sustainable development of nuclear energy. Effective capture of Cs+ from acidic solutions is still challenging, mainly due to the low stability of the adsorbing materials and the competitive adsorption of protons. Herein, the rapid and highly selective capture of Cs+ from strongly acidic solutions is achieved by a robust K+-directed layered metal sulfide KInSnS4 (InSnS-1) that exhibits excellent acid and radiation resistance. InSnS-1 possesses high adsorption capacity for Cs+ and can serve as the stationary phase in ion exchange columns to effectively remove Cs+ from neutral and acidic solutions. The adsorption of Cs+ and H3O+ is monitored by single-crystal structure analysis, and thus the underlying mechanism of selective Cs+ capture from acidic solutions is elucidated at the molecular level.

Coordination/cation exchangeable dual sites intercalated multilayered T3C2Tx MXene for selective and ultrafast removal of thallium(i) from water

“…1d). A new peak of K 2p appears at 293.45 eV, could be a result of the KOH treatment, 23 accompanied by the reduction of the fluorine peak intensity and the increase of the oxygen peak intensity. 12,49 The O 1s spectrum shows the increased intensity of the Ti–OH peak in KOH@Ti 3 C 2 T x NSs, confirming that the increased oxygen peak intensity originates from the introduction of hydroxyl (Fig.…”

“…Synergistic utilization of these mechanisms is anticipated to lead to more efficient adsorbents, in which the rational design of adsorption sites and the elucidation of synergistic mechanisms are of great significance. 23…”

Structural investigation of the efficient capture of Cs+ and Sr2+ by a microporous Cd–Sn–Se ion exchanger constructed from mono-lacunary supertetrahedral clusters

“…However, there are still serious unresolved issues that hinder the design and preparation of new advanced exchangers. One of the issues is the uncertainty of the exact adsorption site for Cs + and Sr 2+ in most cases due to the lack of good crystallinity on the exchange process, as limited to recent examples including InSnS-1, 50 FJSM-SbS, 51 ZnSnS-1, 39 CuGeSe-1, 48 and AgSnSe-1. 49 In addition, the effects of the chemical environment on adsorption selectivity are not well understood, especially for cases where the intercalation of larger hydrated ions is inhibited to some extent.…”

M–Sn–Q (M = Zn, Cd; Q = S, Se) Compounds Templated by (Alkyl)ammonium Species: Synthesis, Crystal Structure, and Sr2+ Adsorption Property

“…Metal chalcogenides represent a class of advanced inorganic materials for their structural variety and application prospect in energy storage, , nonlinear optics, adsorption and separation, − fast-ion conduction, photo/electrocatalysis, − etc. Chalcogenidostannates have attracted increasing concerns because of the flexible coordination of Sn 4+ ions and the versatile condensations of the {SnQ x } (Q = S, Se; x = 4, 5, 6) polyhedra. − A strategy for developing new chalcogenidostannates is to integrate the polyhedra of Sn 4+ and another metal ion (e.g., Cu + , , Ag + , − Mn 2+ , − Zn 2+ , , Cd 2+ , , and Sb 3+ , ) with a different valence state and/or coordination geometry.…”