Effective 137Cs+ and 90Sr2+ immobilisation from groundwater by inorganic polymer resin Clevasol® embedded within a macroporous cryogel host matrix

Chaplin, Joshua D.; Berillo, Dmitriy; Purkis, Jamie M.; Byrne, Marie L.; Tribolet, Alexandre D.C.C.M.; Warwick, Phillip E.; Cundy, Andrew

doi:10.1016/j.mtsust.2022.100190

Cited by 3 publications

(9 citation statements)

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“…To prepare the cryogel, 10 mL of CHI (1.5% w/v) in acetic acid (2 vol.%) and 0.525 mL of GA (5 vol.%) were added and mixed to final concentrations of CHI 1.4% and GA 0.25%. The reaction mixture was frozen in polypropylene Falcon tubes (15 mL) at −15 • C in a cryostat for 3-4 h. To complete the crosslinking reaction, the CHI-GA-1 cryogel was then incubated in a freezer at −22 • C for 48 h. The samples were then thawed at room temperature, washed with distilled water, and finally washed in degassed water [38]. Cryogel CHI-GA-2 was prepared analogously.…”

Section: Preparation Of Chi-ga Cryogelmentioning

confidence: 99%

“…Experimental settings included a compression rate of 0.05 mm•s −1 and a 50 mm diameter plunger at up to 35-40% sample compression. Young's modulus was determined from the linear region of the stress-strain regime of cryogel samples at >5% compression [38].…”

Section: Study Of Mechanical Properties (Stress-strain Regime and You...mentioning

confidence: 99%

“…AgNP/GO/chitosan nanocomposites with a particle size of 20-35 nm were adapted for the removal of Fe(III) and Cr(VI) ions, revealing a chromium adsorption capacity of 40-44 mg•g −1 [37]. Thus, Clevasol ® CHI-glutaraldehyde cryogels revealed the in situ deployment of an ion exchanger with rapid uptake kinetics for radioactive elements; the uptake capacities for Cs + and Sr 2+ in groundwater simulant were 298 and 128 mg/g, respectively [38]. Nevertheless, there are limited reports about the application of macroporous adsorbents for the removal of AgNPs, metal nanoparticles, or metal oxides.…”

Section: Introductionmentioning

confidence: 99%

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Chitosan Glutaraldegyde Cryogels for Wastewater Treatment and Extraction of Silver Nanoparticles

Berillo,

Arysbek

2023

Processes

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The discharge of nanoparticles into the environment, such as through industrial plants and municipal wastewater treatment plants, can pose a hazard to aquatic life. This study demonstrates the effective removal of silver nanoparticles (AgNPs) using a chitosan-based cryogel, which has potential applications in agriculture, as well as in water treatment or in industrial plants that discharge into environmentally sensitive water bodies. The adsorbent is economically viable, has high affinity toward metal nanoparticles, is biodegradable and biocompatible, and displays a good removal of nanoparticles. AgNP adsorption was monitored using UV/Vis spectroscopy and TEM analysis. SEM, nitrogen adsorption, TGA, and FTIR analysis were used for cryogel characterization. The BET model of nitrogen adsorption revealed a specific surface area of 7.7 m2/g for chitosan–glutaraldehyde (CHI–GA) cryogels. The elasticity modulus of the CHI–GA cryogel was estimated as 543 ± 54 kPa. The AgNPs were characterized by a negative charge (−38 ± 17 mV) and an average diameter of 64 nm with a polydispersity index of 0.16. The mechanism of AgNP adsorption involved electrostatic interactions between the oppositely charged surfaces of the cryogel and particles. The temperature of the cryogel preparation affected the water permeability and adsorption efficiency. CHI–GA illustrated a capacity of 63 mg/g at a flow rate of 0.8 mL/min under a solution pressure of 500–970 Pa. The increase in pressure of the model plant extract-stabilized AgNP suspension (14 mg/L AgNPs) to 3.42–3.9 kPa led to an increase in the water permeability rate to 10 mL/min and a significant decrease in the efficiency of particle removal. The CHI–GA adsorbent demonstrated up to 96.5% AgNP removal until the breakthrough point due to adsorbent saturation. The CHI–GA cryogel adsorbent (1 g) can be used for efficient filtering of about 4.5 L of contaminated water.

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Section: Preparation Of Chi-ga Cryogelmentioning

confidence: 99%

Section: Study Of Mechanical Properties (Stress-strain Regime and You...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chitosan Glutaraldegyde Cryogels for Wastewater Treatment and Extraction of Silver Nanoparticles

Berillo,

Arysbek

2023

Processes

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“…This is especially pertinent at sites where nuclear discharges have supplied the local waters and sediments with a significant supply of radionuclides such as the Cumbrian coastal environment, which is labelled with historic radionuclide discharges from the UK’s Sellafield facility. 6 , 10 − 14 …”

Section: Introductionmentioning

confidence: 99%

“…The accumulation of actinides within marine biota must therefore be monitored to ensure that the radiation dose received by human consumers does not reach hazardous levels. This is especially pertinent at sites where nuclear discharges have supplied the local waters and sediments with a significant supply of radionuclides such as the Cumbrian coastal environment, which is labelled with historic radionuclide discharges from the UK’s Sellafield facility. ,− …”

Section: Introductionmentioning

confidence: 99%

Time-Integrated Bioavailability Proxy for Actinides in a Contaminated Estuary

et al. 2022

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Actinides accumulate within aquatic biota in concentrations several orders of magnitude higher than in the seawater [the concentration factor (CF)], presenting an elevated radiological and biotoxicological risk to human consumers. CFs currently vary widely for the same radionuclide and species, which limits the accuracy of the modeled radiation dose to the public through seafood consumption. We propose that CFs will show less dispersion if calculated using a time-integrated measure of the labile (bioavailable) fraction instead of a specific spot sample of bulk water. Herein, we assess recently developed configurations of the diffusive gradients in thin films (DGT) sampling technique to provide a more accurate predictor for the bioaccumulation of uranium, plutonium, and americium within the biota of the Sellafield-impacted Esk Estuary (UK). We complement DGT data with the cross-flow ultrafiltration of bulk seawater to assess the DGT-labile fraction versus the bulk concentration. Sequential elution of Fucus vesiculosis reveals preferential internalization and strong intracellular binding of less particle-reactive uranium. We find significant variations between CF values in biota calculated using a spot sample versus using DGT, which suggest an underestimation of the CF by spot sampling in some cases. We therefore recommend a revision of CF values using time-integrated bioavailability proxies.

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Removal of Cs-137 from Liquid Alkaline High-Level Radwaste Simulated Solution by Sorbents of Various Classes

Milyutin,

Nekrasova,

Kozlov

et al. 2023

Sustainability

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The present work describes the results of the removal of cesium by sorbents of various classes from highly mineralized alkaline solutions simulating the clarified phase of storage tanks with high-level radioactive waste (HLW) of the Mayak Production Association. Within the scope of the performed works, inorganic sorbents of the Clevasol® and Fersal brands, as well as resorcinol-formaldehyde ion-exchange resins (RFRs: RFR-i, RFR-Ca, and Axionit RCs), were used. The sorbents’ characteristics under both static and dynamic conditions are presented. The Fersal sorbent has demonstrated the best sorption characteristics in the series of sorbents under study. The disadvantage of inorganic sorbents is the loss of mechanical strength upon cesium desorption, which complicates their repeated use. It has been demonstrated that RFRs, despite their lower selectivity towards cesium and adsorption capacity, can be used many times in repeated sorption-desorption cycles. The latter makes RFRs more technologically attractive in terms of the total volume of decontaminated HLW. However, RFRs tend to be oxidized during storage, which results in the formation of carboxyl groups and a decrease in sorption characteristics—this must be further taken into account in the real processes of liquid radioactive waste (LRW) management.

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Effective 137Cs+ and 90Sr2+ immobilisation from groundwater by inorganic polymer resin Clevasol® embedded within a macroporous cryogel host matrix

Cited by 3 publications

References 49 publications

Chitosan Glutaraldegyde Cryogels for Wastewater Treatment and Extraction of Silver Nanoparticles

Chitosan Glutaraldegyde Cryogels for Wastewater Treatment and Extraction of Silver Nanoparticles

Time-Integrated Bioavailability Proxy for Actinides in a Contaminated Estuary

Removal of Cs-137 from Liquid Alkaline High-Level Radwaste Simulated Solution by Sorbents of Various Classes

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