Cesium removal from wastewater: High-efficient and reusable adsorbent K1.93Ti0.22Sn3S6.43

Jiang, Zhenzhen; Liu, Gaoling; Ma, Chi; Guo, Yafei; Duo, Ji; Li, Mingli

doi:10.1016/j.chemosphere.2022.135406

Cited by 17 publications

(10 citation statements)

References 54 publications

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“…Because their sequestration method relies on forming bonds between sulfur and the analytes of interest, they intrinsically have a low affinity for hard Lewis acid ions such as Na + , K + , Ca 2+ , and others. Previous studies have demonstrated high removal efficiencies of Hg 2+ , Pb 2+ , Cd 2+ , Ni 2+ , Co 2+ , UO 2 2+ , Cs + , and Sr 2+ over a wide range of pH values (1 < pH < 12). − In particular, among the reported MSIEs, K 2 MnSn 2 S 6 (KMS-1) and KInSnS 4 (InSnS-1) have demonstrated selectivity in strongly acid solutions as well. These qualities make MSIEs promising candidates for use in the capture of actinides from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Metal Sulfide Ion Exchangers: High Acid Stability of Na_2xMg_2y–xSn_4–yS₈ (NMS) and Topotactic Conversion to 2D Solid Acids with Semiconducting Character

Quintero,

Pournara,

Godsel

et al. 2023

Inorg. Chem.

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Metal sulfide ion exchange materials (MSIEs) are of interest for nuclear waste remediation applications. We report the high stability of two structurally related metal sulfide ion exchange materials, Na2x Mg2y–x Sn4–y S8 (Mg-NMS) and Na2SnS3 (Na-NMS), in strongly acid media, in addition to the preparation of Na2x Ni2y–x Sn4–y S8 (Ni-NMS). Their formation progress during synthesis is studied with in-situ methods, with the target phases appearing in <15 min, reaction completion in <12 h, and high yields (75–80%). Upon contact with nitric or hydrochloric acid, these materials topotactically exchange Na+ for H+, proceeding in a stepwise protonation pathway for Na5.33Sn2.67S8. Na-NMS is stable in 2 M HNO3 and Mg-NMS is stable in 4 M HNO3 for up to 4 h, while both NMS materials are stable in 6 M HCl for up to 4 days. However, the treatment of Mg-NMS and Na-NMS with 2–6 M H2SO4 reveals a much slower protonation process since after 4 h of contact both NMS and HMS are present in the solution. The resultant protonated materials, H2x Mg2y–x Sn4–y S8 and H4x [(H y Na y–1)1.33x Sn4––1.33x ]S8, are themselves solid acids and readily react with and intercalate a variety of organic amines, where the band gap of the resultant adduct is influenced by amine choice and can be tuned within the range of 1.88(5)–2.27(5) eV. The work function energy values for all materials were extracted from photoemission yield spectroscopy in air (PYSA) measurements and range from 5.47 (2) to 5.76 (2) eV, and the relative band alignments of the materials are discussed. DFT calculations suggest that the electronic structure of Na2MgSn3S8 and H2MgSn3S8 makes them indirect gap semiconductors with multi-valley band edges, with carriers confined to the [MgSn3S8]2– layers. Light electron effective masses indicate high electron mobilities.

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Section: Introductionmentioning

confidence: 99%

Metal Sulfide Ion Exchangers: High Acid Stability of Na_2xMg_2y–xSn_4–yS₈ (NMS) and Topotactic Conversion to 2D Solid Acids with Semiconducting Character

Quintero,

Pournara,

Godsel

et al. 2023

Inorg. Chem.

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“…Various technologies, such as solvent extraction, − chemical precipitation, and adsorption/ion exchange − have been used to separate Cs + from aqueous solution for decades. In these methods, solvent extraction is an efficient method for separation of Cs + from brine due to the high affinity between the extractants and Cs + ; however, extractants are generally expensive and easy to lose during extraction process, and the stripping may require strong acids.…”

Section: Introductionmentioning

confidence: 99%

“…Adsorption and ion exchange are generally used to remove trace ions from aqueous solution and exhibit an excellent application prospect due to its low energy consumption and environmental friendliness. In recent years, various Cs + adsorbents, such as metal sulfides, − ammonium molybdophosphates, metal ferrocyanides, − and titanate/vanadium/tungsten-based materials ,− have been developed. Among them, vanadosilicate composites, a series of porous materials composed of mixed crystal structures of silicon tetrahedron (SiO 4 ) and vanadium oxide polyhedron, such as vanadium tetrahedron (VO 4 ), pentahedron (VO 5 ), or octahedron (VO 6 ), have gained increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Separation of Cs⁺ from Brines Using an Electroactive Layered Composite of Vanadosilicate

Bian

Zhang

Rong

et al. 2023

ACS Sustainable Chem. Eng.

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Green and sustainable separation and recovery of cesium ion (Cs+) have been an important topic in terms of stable supply of this strategic element in recent decades. In this study, to the best of our knowledge, layered vanadosilicate composite was prepared and employed for highly selective separation of Cs+ using an electrochemically controlled process for the first time. The effects of applied voltage, desorption electrolyte, and ion concentration in the Cs+ isolation process were thoroughly investigated. Our results demonstrate that the adsorption and desorption of Cs+ on the electrode can be easily controlled via the redox reactions of vanadium and the efficiency was significantly improved, exhibiting the increase in adsorption capacity from 12.7 to 50.3 mg g–1, while the desorption ratio reached 95% in the presence of an electric field. A good-to-excellent selectivity of Cs+ over K+, Ca2+, and Mg2+ was observed, showing that the separation factors of Cs+/K+, Cs+/Ca2+, and Cs+/Mg2+ are 11.7, 28.9, and 181.4, respectively. Cyclic test shows that the vanadosilicate-coated electrode was stable, which indicates that it can be continuously used to achieve the separation and enrichment of Cs+ in brines. Raman and X-ray photoelectron spectroscopy results revealed that the Cs+ adsorption was achieved by coupling ion-exchange reactions between Cs+ and Na+ and electrochemical reactions (the redox reaction between V3+ and V4+), and the high adsorption capacity was achieved due to the strong binding affinity of Cs+ toward oxygen donors. We anticipate that our findings may point a new way to the green and sustainable separation and enrichment of Cs+ or other trace strategic metals from brines using vanadium-based materials in an electrochemically controlled process.

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“…Mertz et al doped Mg elements in KMS-2 . The theoretical adsorption capacity of Cs + could reach 531.7 mg/g, but the adsorption equilibrium time was 10–15 h. In addition, in the doping of Mn, Mg, Zn, and other elements, although improving the adsorption effect of the adsorbent from one aspect, it is not yet possible to have a fast adsorption rate, a large adsorption capacity, and excellent reliability at the same time. − Although a lot of scientific research results have been achieved recently for metal sulfides, there are still some common problems: (i) the synthesis time of the materials is generally long; (ii) the adsorption rate of the materials is slow; (iii) the adsorption capacity of the materials is low; (iv) powder materials are difficult to separate; and (v) a series of other problems. Therefore, it is very challenging to solve the above issues while ensuring the performance of sulfides.…”

Section: Introductionmentioning

confidence: 99%

Novel Zr-Doped Thiostannate Spinning Fiber (Fiber-KZrTS) for Highly Efficient and Renewable Recovery of Cesium and Strontium from Geothermal Water

Wei

et al. 2023

ACS Appl. Mater. Interfaces

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The efficient and renewable recovery of cesium and strontium by absorption from a new type of geothermal water liquid mineral resource is highly desirable but still challenging. In this work, a new Zr-doped layered potassium thiostannate adsorbent (KZrTS) was first synthesized and used for Cs+ and Sr2+ green and efficient adsorption. It was found that KZrTS had very fast adsorption kinetics toward both Cs+ and Sr2+ with an equilibrium reached within 1 min, and the theoretical maximum adsorption capacities for Cs+ and Sr2+ were 402.84 and 84.88 mg/g, respectively. Moreover, to solve the loss problem of the engineering application of the powdered adsorbent KZrTS, KZrTS was uniformly coated with polysulfone by wet spinning technology to form micrometer-level filament-like absorbents (Fiber-KZrTS), whose adsorption equilibrium rates and capacities toward Cs+ and Sr2+ are almost the same as that of powder. Furthermore, Fiber-KZrTS showed excellent reusability, and the adsorption performance remained virtually unchanged after 20 cycles. Therefore, Fiber-KZrTS has potential application for green and efficient cesium and strontium recovery from geothermal water.

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Cesium removal from wastewater: High-efficient and reusable adsorbent K1.93Ti0.22Sn3S6.43

Cited by 17 publications

References 54 publications

Metal Sulfide Ion Exchangers: High Acid Stability of Na_2xMg_2y–xSn_4–yS₈ (NMS) and Topotactic Conversion to 2D Solid Acids with Semiconducting Character

Metal Sulfide Ion Exchangers: High Acid Stability of Na_2xMg_2y–xSn_4–yS₈ (NMS) and Topotactic Conversion to 2D Solid Acids with Semiconducting Character

Highly Selective Separation of Cs⁺ from Brines Using an Electroactive Layered Composite of Vanadosilicate

Novel Zr-Doped Thiostannate Spinning Fiber (Fiber-KZrTS) for Highly Efficient and Renewable Recovery of Cesium and Strontium from Geothermal Water

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Cesium removal from wastewater: High-efficient and reusable adsorbent K1.93Ti0.22Sn3S6.43

Cited by 17 publications

References 54 publications

Metal Sulfide Ion Exchangers: High Acid Stability of Na2xMg2y–xSn4–yS8 (NMS) and Topotactic Conversion to 2D Solid Acids with Semiconducting Character

Metal Sulfide Ion Exchangers: High Acid Stability of Na2xMg2y–xSn4–yS8 (NMS) and Topotactic Conversion to 2D Solid Acids with Semiconducting Character

Highly Selective Separation of Cs+ from Brines Using an Electroactive Layered Composite of Vanadosilicate

Novel Zr-Doped Thiostannate Spinning Fiber (Fiber-KZrTS) for Highly Efficient and Renewable Recovery of Cesium and Strontium from Geothermal Water

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Product

Resources

About

Metal Sulfide Ion Exchangers: High Acid Stability of Na_2xMg_2y–xSn_4–yS₈ (NMS) and Topotactic Conversion to 2D Solid Acids with Semiconducting Character

Metal Sulfide Ion Exchangers: High Acid Stability of Na_2xMg_2y–xSn_4–yS₈ (NMS) and Topotactic Conversion to 2D Solid Acids with Semiconducting Character

Highly Selective Separation of Cs⁺ from Brines Using an Electroactive Layered Composite of Vanadosilicate