Technetium-99 decontamination from radioactive wastewater by modified bentonite: batch, column experiment and mechanism investigation

Yang, Junqiang; Shi, Keliang; Wu, Fei; Tong, Juan; Su, Yin; Liu, Tonghuan; He, Jiangang; Mocilac, Pavle; Hou, Xiaolin; Wu, Wangsuo; Shi, Wenjing

doi:10.1016/j.cej.2021.131333

Cited by 40 publications

(5 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To capture the optimal structure of each species, many different initial geometries were considered during the optimization process. After that, liquid-phase single-point calculations at the M062X/6–311++G** level were performed . The solvation model-based on density (SMD) model of water was employed in the single-point calculation to consider the effect of the solvent.…”

Section: Methodssupporting

confidence: 75%

“…Since TcO 4 – is an anion, ion exchange is considered to be the most effective method to capture TcO 4 – . Studies have shown that different types of anion exchange materials such as resin, − organic polymer materials, − and inorganic materials − can capture TcO 4 – . However, these materials are not perfect.…”

Section: Introductionmentioning

confidence: 99%

“…After that, liquid-phase single-point calculations at the M062X/6−311++G** level 40 were performed. 10 The solvation model-based on density (SMD) model of water was employed in the single-point calculation to consider the effect of the solvent. Binding energies of M + /NO 3 − and M + /ReO 4 − were calculated using the following equation: neutral aqueous solution (100 ppm) were mixed and shaken for 30 min.…”

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Novel Functionalized Ionic Liquid for Highly Selective Extraction of TcO₄^–

Huang

et al. 2022

Inorg. Chem.

Self Cite

View full text Add to dashboard Cite

Due to the highly acidic and high-salinity nature of the high-level radioactive waste liquid (HLLW), selective extraction of TcO4 – from HLLW remains to be a challenging task. Traditional anion exchangers show low selectivity and unsatisfactory extraction performance due to the lack of functional groups that can interact strongly with TcO4 –. In this work, a tailor-made binding site was constructed by decorating two acetamide functional groups on imidazolium cation to fabricate a new Tc separation material, which exhibits high selectivity. Unlike most reported Tc separation materials, which can only perform well under low acidic, neutral, or alkaline conditions, this material still has good extraction performance in highly acidic solutions. In the simulated high-level waste liquid of 3 M nitric acid, the extraction efficiency of 0.5 mol/L organic phase for Tc can reach 96.5% through the first-stage extraction. Our theoretical simulations suggest that ReO4 –/TcO4 – anions were adsorbed on the top of the imidazolium ring during the extraction process, with p−π and p–p interactions acting as the driving forces.

show abstract

Section: Methodssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Functionalized Ionic Liquid for Highly Selective Extraction of TcO₄^–

Huang

et al. 2022

Inorg. Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The experimental data were fitted using the above model (Figure a,b), and the summary of various parameters is shown in Table S2. The results show that the adsorption kinetic data of CM-APTS-EDB e are more consistent with the pseudo-second-order model, and the adsorption rate constant ( k 2 ) in the adsorption of ReO 4 – is controlled by the chemisorption process …”

Section: Resultsmentioning

confidence: 99%

Enhanced Adsorption Performance for ReO₄^–/⁹⁹TcO₄^– Using Amino-Functionalized Cellulose Microspheres with Halogen Microregulation

Liu,

Zhu,

Huang

et al. 2024

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

There is a critical need to develop cost-effective and efficient adsorption materials for the removal of technetium-99 ( 99 Tc) from contaminated water sources. This research presents the synthesis of amino-modified cellulose microspheres (CM-APTS) through the addition of 3-amino-propyl triethoxysilane (APTS) to regenerated cellulose microspheres (CM), followed by a subsequent reaction with ethylene dibromide (EDB) to produce halogen-modified amino cellulose microspheres (CM-APTS-EDB). These are engineered for the effective absorption of ReO 4 − , serving as a chemical surrogate for TcO 4 − . By altering the amount of ethylene dibromide used, two variations of bromine-modified cellulose microspheres, CM-APTS-EDB s and CM-APTS-EDB e , are synthesized. Among these, CM-APTS-EDB e exhibits robust adsorption capabilities for ReO 4 − across a pH spectrum of 2.5−10, attaining a peak capacity of 281 mg•g −1 , and demonstrates selective adsorption of ReO 4 − even in the presence of competing anions such as NO 3 − , Cl − , and SO 4 2− . Characterization through X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) indicates that the adsorption mechanism predominantly involves interactions between ReO 4 − and N + , hydrogen bonding with amino hydrogen, and σ-hole-anion interactions between Re−O and C−Br. After eight adsorption− desorption cycles, CM-APTS-EDB e retains notable stability and reusability. Additionally, the material efficiently captures ReO 4 − from simulated Hanford Low Activity Waste (LAW) wastewater, achieving an adsorption efficiency of 77.26% at a solid−liquid ratio of 40 g•L −1 . This investigation underlines the potential of halogenated regenerated cellulose microspheres in designing advanced adsorbents for the removal of radioactive pollutants like TcO 4 − /ReO 4 − , offering a strategy for environmental remediation efforts.

show abstract

“…Yang et al [55] synthesized Hexadecylpyridinium Chloride Monohydrate modified bentonite (HDPy-bent) and used it as an adsorbent to remove-99 (99Tc). Results are demonstrated that the HDPy-bent is a low-cost sorbent which can efficiently eliminate Technetium-99 from wastewaters.…”

Section: Application Of Organoclay To Remove Radioactivementioning

confidence: 99%

Organoclay Nano-Adsorbent: Preparation, Characterization and Applications

Yahya¹,

Hamdi²,

Hamdi³

2022

Nanoclay - Recent Advances, New Perspectives and Applications

View full text Add to dashboard Cite

Organoclay has a tremendous impact on both fundamental studies and practical applications in numerous fields. In this context, this chapter investigates the performance of Organoclay in wastewater treatment. In particular, the adsorption of various hazardous substances has been reviewed. This study aims to give an overview of the preparation methods of Organoclay. The second purpose was to discuss the removal efficiency and reliability of various pollutants by organoclay. The third goal discussed the isotherms and kinetics used for the data interpretation. This work revealed that the characteristics of Organoclay depend mainly on the type of clay used and the nature of the intercalated surfactant. Sorption efficiency was found to depend on the nature of Organoclay, type of pollutant, pH, contact time and the concentration of pollutant.

show abstract

Technetium-99 decontamination from radioactive wastewater by modified bentonite: batch, column experiment and mechanism investigation

Cited by 40 publications

References 46 publications

A Novel Functionalized Ionic Liquid for Highly Selective Extraction of TcO₄^–

A Novel Functionalized Ionic Liquid for Highly Selective Extraction of TcO₄^–

Enhanced Adsorption Performance for ReO₄^–/⁹⁹TcO₄^– Using Amino-Functionalized Cellulose Microspheres with Halogen Microregulation

Organoclay Nano-Adsorbent: Preparation, Characterization and Applications

Contact Info

Product

Resources

About

Technetium-99 decontamination from radioactive wastewater by modified bentonite: batch, column experiment and mechanism investigation

Cited by 40 publications

References 46 publications

A Novel Functionalized Ionic Liquid for Highly Selective Extraction of TcO4–

A Novel Functionalized Ionic Liquid for Highly Selective Extraction of TcO4–

Enhanced Adsorption Performance for ReO4–/99TcO4– Using Amino-Functionalized Cellulose Microspheres with Halogen Microregulation

Organoclay Nano-Adsorbent: Preparation, Characterization and Applications

Contact Info

Product

Resources

About

A Novel Functionalized Ionic Liquid for Highly Selective Extraction of TcO₄^–

A Novel Functionalized Ionic Liquid for Highly Selective Extraction of TcO₄^–

Enhanced Adsorption Performance for ReO₄^–/⁹⁹TcO₄^– Using Amino-Functionalized Cellulose Microspheres with Halogen Microregulation