Graphene oxide supported filtration of cesium from aqueous systems

Narayanam, Pavan K.; Jishnu, AP; Sankaran, K.

doi:10.1016/j.colsurfa.2017.12.055

Cited by 18 publications

(4 citation statements)

References 46 publications

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“…Cs + and Sr 2+ were selected as the targeting adsorbates due to their mid-range half-lives (t 1/2 = 30.2 and 28.8 years, respectively) and high fission yields (6.3 and 4.5%, respectively) 54 . Precedent examples of Cs + and Sr 2+ capture materials exist in the form of inorganic compound 29,55,56 , carbon heterostructure 27,57,58 , Prussian blue pigments [59][60][61] , metalorganic-framework 62 , and chalcogels 13 , but most of them are only functional in complex heterostructure form or require multiple steps of synthetic protocols (Supplementary Table 3). In contrast, NMSCs are anticipated to be functional for Cs + and Sr 2+ capture through ionexchange principle, as precedent layered chalcogenide compound (e.g., KMS-1) are known to attract them with high efficiency.…”

Section: Aqueous Radionuclide-adsorption Capabilities Of Nmscsmentioning

confidence: 99%

Multiscale structural control of thiostannate chalcogels with two-dimensional crystalline constituents

Lee

Kang

et al. 2022

Nat Commun

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Chalcogenide aerogels (chalcogels) are amorphous structures widely known for their lack of localized structural control. This study, however, demonstrates a precise multiscale structural control through a thiostannate motif ([Sn2S6]4−)-transformation-induced self-assembly, yielding Na-Mn-Sn-S, Na-Mg-Sn-S, and Na-Sn(II)-Sn(IV)-S aerogels. The aerogels exhibited [Sn2S6]4−:Mn2+ stoichiometric-variation-induced-control of average specific surface areas (95–226 m2 g−1), thiostannate coordination networks (octahedral to tetrahedral), phase crystallinity (crystalline to amorphous), and hierarchical porous structures (micropore-intensive to mixed-pore state). In addition, these chalcogels successfully adopted the structural motifs and ion-exchange principles of two-dimensional layered metal sulfides (K2xMnxSn3-xS6, KMS-1), featuring a layer-by-layer stacking structure and effective radionuclide (Cs+, Sr2+)-control functionality. The thiostannate cluster-based gelation principle can be extended to afford Na-Mg-Sn-S and Na-Sn(II)-Sn(IV)-S chalcogels with the same structural features as the Na-Mn-Sn-S chalcogels (NMSCs). The study of NMSCs and their chalcogel family proves that the self-assembly principle of two-dimensional chalcogenide clusters can be used to design unique chalcogels with unprecedented structural hierarchy.

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Section: Aqueous Radionuclide-adsorption Capabilities Of Nmscsmentioning

confidence: 99%

Multiscale structural control of thiostannate chalcogels with two-dimensional crystalline constituents

Lee

Kang

et al. 2022

Nat Commun

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“…A series of nuclides (e.g. Cs(I), Sr(II), Eu(III), U(VI) and Th(IV)) can be effectively adsorbed onto GO or functionalized GO [2][3][4]. Nevertheless, GO nanosheets are not feasible for use as a solid absorbent.…”

Section: Introductionmentioning

confidence: 99%

The role of interlayers in enlarging the flux of GO membranes

Zhang

et al. 2020

Nanotechnology

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A graphene oxide (GO) membrane can be easily made by filtering a GO solution onto a supporting layer, and such a membrane is effective at adsorbing ions. But low flux and a high work pressure become an obstacle for its application in wastewater treatment. In this study, a positively charged mixture of carbon nanotubes and chitosan (CNTS) served as an interlayer to improve the GO membrane’s flux. The three-layer membrane is known as MCG, while one without an interlayer is known as MG. For MCG and MG with the same GO load, the water flux of MCG reaches 2–8 times larger than that of MG. A better water permeability is consistently detected for MCG, with a contact angle descent speed of 3.3°/s, which is significantly faster than that of MG (0.5°/s). The ion rejections of MCG and MG are mostly attributed to GO adsorption, which stay at the same level. The flux varies with GO load, CNTS load and membrane dryness, while the ion rejection is correlated with the GO load. Optimized membrane fabrication conditions are suggested as being a CNTS load of 0.72 g m−2 and a GO load of 0.4 g m−2. A ‘gap’ mechanism is suggested to explain the interlayer effects. The rougher interlayer surface produces gaps between the GO and CNTS layers, which results in the faster water permeation and higher flux of MCG. These results demonstrate that it is possible to fabricate high flux GO membranes by adding a controlled-roughness interlayer.

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“…However, nuclear power has potential threats to humans and the environment, such as the radioactive wastes leaked from tanks or released from nuclear accidents . Leakage of radionuclides can contaminate the air–water–soil, further enter into the food chain, and ultimately become a part of living beings, which will endanger the biodiversity and human health . The development of treatment methods for the fast and efficient removal of radionuclides, especially in complex media (e.g., seawater), has priority for reinforcing the security of the entire nuclear industry .…”

Section: Introductionmentioning

confidence: 99%

“…2 Leakage of radionuclides can contaminate the air−water−soil, further enter into the food chain, and ultimately become a part of living beings, which will endanger the biodiversity and human health. 3 The development of treatment methods for the fast and efficient removal of radionuclides, especially in complex media (e.g., seawater), has priority for reinforcing the security of the entire nuclear industry. 4 The isotope 137 Cs is the main component of radioactive wastewater, and it is considered as the most serious radionuclide from the point of the environment due to its relatively long half-life time (30 years), high volatility, high activity, and high solubility.…”

Section: Introductionmentioning

confidence: 99%

BiOCl-Coated Electroactive Film for Potential-Triggered Selective Removal of Cesium Ions from Simulated Wastewater

Shen

Gao

et al. 2019

Ind. Eng. Chem. Res.

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Bismuth oxychloride (BiOCl)-coated electroactive film was fabricated for the separation of cesium ions based on a potential-triggered method. The effects of applied potential, conductive carbon black (Super P Li), and different exposed facets on the adsorption of Cs + ions were investigated. Experiments revealed that the adsorption efficiency gradually improved with increasing the applied potential to −0.7 V. The introduction of Super P Li improved the adsorption rate and increased the separation efficiency. The adsorption behavior followed pseudo-second-order kinetics. Additionally, the electroactive film showed adsorption selectivity for Cs + in preference to Li + , Na + , and Rb + ; seven consecutive adsorption−desorption experiments indicated that the electroactive film is sensitive to potential. The BiOCl nanosheets with exposed (001) facets exhibited a higher adsorption ratio for Cs + removal than the counterpart with exposed (101) facets. It was also found that the separation performance of Cs + ions was best in the neutral condition. It is expected that this BiOCl material can be used as a promising electroactive material for the removal of Cs + ions from contaminated water in the future.

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Graphene oxide supported filtration of cesium from aqueous systems

Cited by 18 publications

References 46 publications

Multiscale structural control of thiostannate chalcogels with two-dimensional crystalline constituents

Multiscale structural control of thiostannate chalcogels with two-dimensional crystalline constituents

The role of interlayers in enlarging the flux of GO membranes

BiOCl-Coated Electroactive Film for Potential-Triggered Selective Removal of Cesium Ions from Simulated Wastewater

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