Hexadecylpyridinium (HDPy) modified bentonite for efficient and selective removal of 99Tc from wastewater

Yang, Junqiang; Shi, Keliang; Gao, Xiaoqing; Hou, Xiaolin; Wu, Wangsuo; Shi, Wenjing

doi:10.1016/j.cej.2019.122894

Cited by 37 publications

(8 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to their large specific area, low permeability, high ion-exchange capacity, facile accessibility, and abundant existence in the environment, clay minerals (bentonite, montmorillonite, and chabazite) have been widely applied for removal of various radionuclides and toxic metals. − These sorbents were also tested for 99 Tc removal from wastewater. − Among these, bentonite clays have been widely studied as an engineering barrier to isolate and impede the release of radioactive wastes deposited in proposed underground geological repositories . However, the permanently negative charged surface of these sorbents has shown poor selectivity and, subsequently, resulted in low adsorption capacities for anionic species, including TcO 4 – .…”

Section: Effective Sequestration Of 99tcmentioning

confidence: 99%

“…Yang et al modified raw bentonite with hexadecylpyridinium (HDPy) and applied it for the removal of both TcO 4 – and its surrogate ReO 4 – . The authors suggested that the interlayer space of surface modified bentonite (HDPy-bent) can be altered by the amount of HDPy and through ion exchange with cations in bentonite layers (Figure ).…”

Section: Effective Sequestration Of 99tcmentioning

confidence: 99%

“…Proposed structures for the modified bentonites (HDPy-bent) at different loading amounts of HDPy. Reproduced with permission from ref . Copyright from Elsevier 2020.…”

Section: Effective Sequestration Of 99tcmentioning

confidence: 99%

“…(D) The effect of competing anions on the adsorption of ReO 4 – . Reproduced with permission from ref . Copyright from Elsevier 2020.…”

Section: Effective Sequestration Of 99tcmentioning

confidence: 99%

See 3 more Smart Citations

Design and Application of Materials for Sequestration and Immobilization of ⁹⁹Tc

Singh

Mahzan

Rashid

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

99Technetium (99Tc) is a hazardous radionuclide that poses a serious environmental threat. The wide variation and complex chemistries of liquid nuclear waste streams containing 99Tc often create unique, site specific challenges when sequestering and immobilizing the waste in a matrix suitable for long-term storage and disposal. Therefore, an effective management plan for 99Tc containing liquid radioactive wastes (such as storage (tanks) and decommissioned wastes) will likely require a variety of suitable materials/matrixes capable of adapting to and addressing these challenges. In this review, we discuss and highlight the key developments for effective removal and immobilization of 99Tc liquid waste in inorganic waste forms. Specifically, we review the synthesis, characterization, and application of materials for the targeted removal of 99Tc from (simulated) waste solutions under various experimental conditions. These materials include (i) layered double hydroxides (LDHs), (ii) metal–organic frameworks (MOFs), (iii) ion-exchange resins (IERs) as well as cationic organic polymers (COPs), (iv) surface modified natural clay materials (SMCMs), and (v) graphene-based materials (GBMs). Second, we discuss some of the major and recent developments toward 99Tc immobilization in (i) glass, (ii) cement, and (iii) iron mineral waste forms. Finally, we present future challenges that need to be addressed for the design, synthesis, and selection of suitable matrixes for the efficient sequestration and immobilization of 99Tc from targeted wastes. The purpose of this review is to inspire research on the design and application of various suitable materials/matrixes for selective removal of 99Tc present globally in different radioactive wastes and its immobilization in stable/durable waste forms.

show abstract

Section: Effective Sequestration Of 99tcmentioning

confidence: 99%

Section: Effective Sequestration Of 99tcmentioning

confidence: 99%

“…Proposed structures for the modified bentonites (HDPy-bent) at different loading amounts of HDPy. Reproduced with permission from ref . Copyright from Elsevier 2020.…”

Section: Effective Sequestration Of 99tcmentioning

confidence: 99%

“…(D) The effect of competing anions on the adsorption of ReO 4 – . Reproduced with permission from ref . Copyright from Elsevier 2020.…”

Section: Effective Sequestration Of 99tcmentioning

confidence: 99%

See 2 more Smart Citations

Design and Application of Materials for Sequestration and Immobilization of ⁹⁹Tc

Singh

Mahzan

Rashid

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Bentonite, after some modifications, displayed greater stability in comparison to other minerals studied in relation to the adsorption/ desorption process [1]. Enhancing the adsorption capacity of bentonite achieved by different activation methods which include acid activation [2,3], organic activation [4,5], nanobentonite composite [6,7], polymer, and surfactant bentonite composite [8,9], along with the combinations of bentonite-zeolite with bentonite-alum and bentonite-limestone [10] was examined. Bentonite is one of the most desirable adsorbents for the removal of several pollutants from wastewater [6].…”

Section: Introductionmentioning

confidence: 99%

Effective Approach of Activated Jordanian Bentonite by Sodium Ions for Total Phenolic Compounds Removal from Olive Mill Wastewater

Al-Essa

2021

Journal of Chemistry

View full text Add to dashboard Cite

Olive mill wastewater (OMW) is nowadays considered a serious environmental problem, especially within the Mediterranean region. With this in mind, water shortages are also a very serious and prevalent concern in third world countries. The aim of this study is to investigate the feasibility of using Jordanian bentonite, a simple and natural clay, as a possible adsorbent to decrease the negative characteristics of raw OMW, as an approach to the development of a methodology that addresses the OMW problem without affecting freshwater resources. The purified bentonite was activated by sodium ions at room temperature. FTIR, XRD, TGA, and BET surface area measurements were performed. OMW was contacted with both purified and activated bentonite in the batch technique to figure out the optimum parameters for the adsorption process. Physiochemical parameters of OMW were measured before and after treatment. The maximum adsorption qm was found as 8.81 mg/g at 323 K for the total phenolic compounds. The Langmuir and Freundlich models were utilized to describe the equilibrium isotherms and both models fit well. The parameters of thermodynamic show that the adsorption process was feasible, spontaneous, and endothermic in nature. These promising results along with the sodium activation of bentonite significantly improve bentonite’s adsorption capacity.

show abstract

Superhydrophobic Phosphonium Modified Robust 3D Covalent Organic Framework for Preferential Trapping of Charge Dispersed Oxoanionic Pollutants

Wang

Lan

Yang

et al. 2022

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Charge dispersed and less hydrophilic anionic pollutants are often difficult to be preferentially captured by common cationic framework materials. A gamma radiation modification approach is employed to anchor a superhydrophobic phosphonium‐containing coating on a robust crystalline 3D covalent organic framework (COF). By regulating the surface hydrophobicity, the prepared 3DCOF‐g‐VBPPh3Cl is endowed with a strong affinity for charge dispersed and less hydrophilic oxoanions, such as MnO4−, TcO4− and ReO4−, to surmount the Hofmeister bias, which much favors remediation of oxoanionic pollutants in complex aqueous systems. Batch and column experiments with 3DCOF‐g‐VBPPh3Cl in both tap water and simulated groundwater are performed, and rapid sequestration is achieved with removal efficacy up to 99.995%, record‐high distribution coefficient of 1.0 × 108 mL g−1, and desirable priority over competing anions such as Cl−, SO42−, HCO3−, and NO3−, confirming promise for remediation of charge dispersed anionic pollutants. Theoretical calculations reveal a mechanism of preferential capture based on electrostatic and dispersion interaction between charge dispersed anions and 3DCOF‐g‐VBPPh3Cl that effectively competes with solvation of the aqueous anions.

show abstract

Hexadecylpyridinium (HDPy) modified bentonite for efficient and selective removal of 99Tc from wastewater

Cited by 37 publications

References 47 publications

Design and Application of Materials for Sequestration and Immobilization of ⁹⁹Tc

Design and Application of Materials for Sequestration and Immobilization of ⁹⁹Tc

Effective Approach of Activated Jordanian Bentonite by Sodium Ions for Total Phenolic Compounds Removal from Olive Mill Wastewater

Superhydrophobic Phosphonium Modified Robust 3D Covalent Organic Framework for Preferential Trapping of Charge Dispersed Oxoanionic Pollutants

Contact Info

Product

Resources

About

Hexadecylpyridinium (HDPy) modified bentonite for efficient and selective removal of 99Tc from wastewater

Cited by 37 publications

References 47 publications

Design and Application of Materials for Sequestration and Immobilization of 99Tc

Design and Application of Materials for Sequestration and Immobilization of 99Tc

Effective Approach of Activated Jordanian Bentonite by Sodium Ions for Total Phenolic Compounds Removal from Olive Mill Wastewater

Superhydrophobic Phosphonium Modified Robust 3D Covalent Organic Framework for Preferential Trapping of Charge Dispersed Oxoanionic Pollutants

Contact Info

Product

Resources

About

Design and Application of Materials for Sequestration and Immobilization of ⁹⁹Tc

Design and Application of Materials for Sequestration and Immobilization of ⁹⁹Tc