Novel two-step process for remediation of Cs-contaminated soil assisted by magnetic composites

Kim, June-Hyun; Kim, Sung-Man; Yoon, In-Ho; Yang, Hee‐Man; Kim, Ilgook

doi:10.1016/j.cej.2021.130554

Cited by 16 publications

(7 citation statements)

References 40 publications

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“…Separation and recovery of the magnetized zeolite were accomplished with an external magnetic field, for example, the magnetic cylinder designed herein. The performance of the magnetized zeolite studied herein was further compared to the previous literature research [36][37][38][39][40][41][42][43][44], as shown in Figure 11c and Table S3. Compared to the literature research, the Cs removal efficiency is significantly higher (99.92%) for the study herein, while the electrokinetic method can achieve a Cs removal rate of 97.6%, which ranks second in table.…”

Section: Cs+ Adsorption Efficiency and Magnetized Zeolite Recovery Ef...mentioning

confidence: 93%

An Evaluation of Cesium Removal from Simulated Radioactive Contaminated Soil with a Magnetized Zeolite Derived from Anthracite

Zhang,

Zhu,

et al. 2023

Applied Sciences

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The magnetized zeolite with an optimized conversion rate of 53% can be readily synthesized from industrial anthracite using a water-based method. The highly porous structure of ferromagnetism zeolite demonstrates robust magnetic properties with a magnetite content of 12–15%, satisfying adsorbent separation and recycling through magnetic cylinder rotating and vibrating separation. A cesium adsorption and removal efficiency as high as 99.92% with a corresponding adsorbent recovery ratio of up to 96.36% can be achieved for the simulated cesium-contaminated soil with a water content of 20% and a cesium content of 1% with an adsorbent-to-contaminated soil ratio of 1:2. Adsorption and magnetic separation technology with magnetized zeolite synthesized from anthracite exhibited a high cesium removal rate and zeolite recovery ratio, demonstrating promising application potential in treating radioactive waste soils and robust and economically viable engineering feasibility.

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Section: Cs+ Adsorption Efficiency and Magnetized Zeolite Recovery Ef...mentioning

confidence: 93%

An Evaluation of Cesium Removal from Simulated Radioactive Contaminated Soil with a Magnetized Zeolite Derived from Anthracite

Zhang,

Zhu,

et al. 2023

Applied Sciences

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“…In this regard, it is necessary to apply treatment, which can reduce secondary waste. The study [20] proposed a new approach to recultivation of soil contaminated with Cs+ using magnetic composites to improve both the efficiency of separation of clay particles and desorption of Cs+. The process of ultrasonic dispersion and magnetic separation was first used to selectively remove clay particles from soil (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Fig.1. A new two-stage process for the restoration of soil contaminated with cesium using magnetic composites[20] …”

mentioning

confidence: 99%

Application of processes stimulated by nonequilibrium plasma for large-tonnage decontamination of soils

Петров

Bondarenko

Homma³

2023

TAPR

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The object of research is a new, potentially effective and practical process for the decontamination of radioactive soil, based on combination of plasma hydroseparation and plasma activation. The cleaning effect is ensured by the destruction of the bonds of radionuclides with soil particles due to a series of electrophysical discharges at which active particles and shock waves appear. In a designed setup, the process of plasma-chemical treatment is implemented in a plasma cell with a self-sustaining pulsating mode of burning an electric discharge, which occurs in an aqueous solution. The setup realizes a resonant increase in the intensity of shock waves, turbulence and multiple expansion of the core, such that the expansion of the plasma-liquid interface becomes a real basis for scaling up the setup. Regardless of the material of the electrodes and in a wide range of electrical conductivity (measured from 100 to 5,000 μS/cm), the restructuring of the combustion regime is accompanied by an increase in the size and stabilization of the luminous zone, fragmentation of bubbles, and an increase in the rate of their evacuation from the discharge zone. The main factors of such a restructuring are the channel dimensions and temperature of the solution. Various materials of the walls of plasma-chemical reactor have been tested: plexiglass, ceramics and stainless steel with the thickness of 2 mm. The maximum increase in the amplitude of resonance oscillations depends on the cell radius. A dynamic pressure, which in an individual discharge is about 5–15 mm of the water column at the mouth of the discharge, increases to 150–200 mm of the water column at the bottom of the plasma cell at resonance. An increase in efficiency is achieved by an optimal choice of the duration of the current phase and the distance between the electrodes, which is 15–30 mm. The voltage drop is 70–80 % across the spark discharge, the rest falls across the solution. The transition of the discharge to a periodic pulsating current mode with an increase in the temperature of the solution has been found. Tests on a mobile plasma-chemical facility for the process of plasma co-precipitation of radionuclides 137Cs, 134Cs and 90Sr with ferrocyanide sorbents under real conditions of hydroseparation of contaminated soil from fields around the Fukushima Daiichi have shown a decrease in organic substances in water by 40 times, and of radioactivity by 75 times.

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“…Selective transport of cations across cation exchange membranes (CEMs) is vital in multiple applications like desalination and energy production by electrodriven transport (ED), reverse electrodriven transport, electrodeionization, capacitive deionization, etc. ,− Transport selectivity (i.e., ability to preferentially transport one cation over another) between multi- and monovalent cations is a prerequisite in processes like water softening, , metal ion extraction, , NaCl production from seawater, , etc., whereas the preferential transport among the monovalent cations is utilized in the process like recovery of Cs + from nuclear waste. , Along with the cationic composition and membrane characteristics, operation parameters are also known to affect the cation transport in CEMs . Therefore, an empirical understanding of the transport phenomena under various working conditions is necessary to improve the process efficiency. , In this regard, the working current/voltage is a crucial parameter in electrodriven processes.…”

Section: Introductionmentioning

confidence: 99%

Current Density Dependence of Transport Selectivity of Metal Ions in the Electrodriven Process across the Cation Exchange Membrane

Mani,

Chaudhury,

Meena

2023

J. Phys. Chem. B

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Understanding the mechanisms leading to the selective transport of cations in an electrodriven process across a cation exchange membrane is important to design and control the potential gradient-based separation process. In this study, a comprehensive description of the current density (I, over a broad current regime) dependence of transport selectivity (S i ) between cations of the same/different valence is presented. The role of conventional transport mechanisms such as diffusion, electromigration, and electroconvection in controlling the S i was identified theoretically as well as by multiple experimental approaches. These parameters were found to be dependent on the limiting current density (I lim). In general, irrespective of the cations involved, S i (over Na+) decreased gradually with increasing I and then increased slowly (and saturated) after I lim. This extent of variation of S i was heavily dependent on the charge and hydration state of the cations. At I < I lim, both diffusion and electromigration processes contributed and, notably, the sorption selectivity outweighed the migration selectivity. At I → I lim, diffusion was the solitary mechanism responsible for cation transport and migration selectivity was the major contributor in S i . At I > I lim, as also validated by the Peclet numbers, the overall transport was dictated by electroconvection.

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Novel two-step process for remediation of Cs-contaminated soil assisted by magnetic composites

Cited by 16 publications

References 40 publications

An Evaluation of Cesium Removal from Simulated Radioactive Contaminated Soil with a Magnetized Zeolite Derived from Anthracite

An Evaluation of Cesium Removal from Simulated Radioactive Contaminated Soil with a Magnetized Zeolite Derived from Anthracite

Application of processes stimulated by nonequilibrium plasma for large-tonnage decontamination of soils

Current Density Dependence of Transport Selectivity of Metal Ions in the Electrodriven Process across the Cation Exchange Membrane

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