Radioactive waste treatments by using zeolites. A short review

Jiménez‐Reyes, M.; Almazán-Sánchez, Perla Tatiana; Solache‐Ríos, M.

doi:10.1016/j.jenvrad.2021.106610

Cited by 77 publications

(25 citation statements)

References 93 publications

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“…Zeolites are well known for their potential use in the removal of heavy metals, e.g., Zn, Hg, ... [17,[28][29][30], organic contaminants, e.g., cationic surfactants, phenol [30,31], reducing excess ammonia [32,33], salinity, and acidity [34], and removal of radionuclides from aqueous radioactive waste effluents [10][11][12]15,35,36]. These applications are supported by their high cation exchange capacity and specific surface area.…”

Section: Advances In the Investigations Of Nano-zeolites As Ion-excha...mentioning

confidence: 99%

“…The examination of the listed data indicates that radioactive contaminants removal reactions are mostly best described using the PSO rate model, which indicates the chemisorption nature of the reaction that involves electron sharing between the contaminants and the zeolite [11,15,28,31,35,38,. For all the reported reactions, the kinetic data can be divided into two portions; the first is fast with a steep slope that is linked to the sorption onto the boundary layer and the second is slower approaching an asymptote which is closely related to particle diffusion [28,40,41,43,44,.…”

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confidence: 99%

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Applications of Nano-Zeolite in Wastewater Treatment: An Overview

Rahman

El-Kamash

Hung

2022

Water

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Nano-zeolite is an innovative class of materials that received recognition for its potential use in water and tertiary wastewater treatment. These applications include ion-exchange/sorption, photo-degradation, and membrane separation. The aim of this work is to summarize and analyze the current knowledge about the utilization of nano-zeolite in these applications, identify the gaps in this field, and highlight the challenges that face the wide scale applications of these materials. Within this context, an introduction to water quality, water and wastewater treatment, utilization of zeolite in contaminant removal from water was addressed and linked to its structure and the advances in zeolite preparation techniques were overviewed. To have insights into the trends of the scientific interest in this field, an in-depth analysis of the variation in annual research distribution over the last decade was performed for each application. This analysis covered the research that addressed the potential use of both zeolites and nano-zeolites. For each application, the characterization, experimental testing schemes, and theoretical analysis methodologies were overviewed. The results of the most advanced research were collected, summarized, and analyzed to allow an easy visualization and comparison of these research results. Finally, the gaps and challenges that face these applications are concluded.

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Section: Advances In the Investigations Of Nano-zeolites As Ion-excha...mentioning

confidence: 99%

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confidence: 99%

Applications of Nano-Zeolite in Wastewater Treatment: An Overview

Rahman

El-Kamash

Hung

2022

Water

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“…If appropriate materials are added to improve the leaching resistance of the CUTB, such materials also fall into the category of backfill-modified materials. Krajnak et al [24][25][26] reported that natural zeolite, an environmental functional mineral with a good adsorption and exchange capacity, also has a good uranium adsorption capacity. However, the mineral composition of these materials is basically consistent with the slag used to prepare cementitious materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Natural Zeolite on Pore Structure of Cemented Uranium Tailings Backfill

Wang¹,

Geng²,

Yuan³

et al. 2023

Journal of Renewable Materials

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The use of some environmental functional minerals as backfill-modified materials may improve the leaching resistance of cemented uranium tailings backfill created from alkali-activated slag (CUTB), but these materials may participate in the hydration reaction of the cementitious materials, which could have a certain impact on the pore structure of the CUTB, thus affecting its mechanical properties and leaching resistance. In this paper, natural zeolite is selected as the backfill-modified material, and it is added to alkali-activated slag paste (AASP) and CUTB in cementitious material proportions of 4%, 8%, 12%, and 16% to prepare AASP mixtures and CUTB mixtures containing environmental functional minerals. After the addition of natural zeolite, the porosity of the CUTB generally increases, but when the content is 4%, the porosity decreases to 22.30%. The uniaxial compressive strength (UCS) of the CUTB generally decreases, but the decrease is the smallest when the content is 4%, and the UCS is 12.37 MPa. The addition of natural zeolite mainly reduces the number of fine pores in the CUTB, but the pores with relaxation times T 2 of greater than 10 ms account for about 10% of the total pores, and there are a certain number of large pores in the CUTB. The main product of alkali-activated slag is calcium (alumino)silicate hydrate (C-(A)-S-H gel). When natural zeolite is added, the hydration products develop towards denser products with a high degree of polymerization and the formation of low polymerization products is reduced. This affects the internal fracture pores of the hydration products and the interface pores of the CUTB, has an irregular effect on the pore characteristics of the CUTB, and influences the UCS.

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“…Zeolites have been employed in low level radioactive waste treatment techniques. However, zeolites have recently been used in the treatment of high and medium level wastes [ 25 ]. These materials have a high radiological stability to beta, alpha, and gamma irradiations, have a high ion exchange capacity, have an excellent chemical and thermal stability, with almost no reactivity to chemicals, are selective, affordable, and abundant.…”

Section: Introductionmentioning

confidence: 99%

Modification of Clinoptilolite as a Robust Adsorbent for Highly-Efficient Removal of Thorium (IV) from Aqueous Solutions

Alotaibi

Ismail

2022

IJERPH

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The natural zeolite has been modified with sulphate and phosphate. The adsorption of thorium from the aqueous solutions by using the natural and modified zeolites has been investigated via a batch method. The adsorbent samples were characterized by X-ray Diffraction (XRD), N2 adsorption–desorption (BET), Fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDX). Modification of natural zeolite with sulphate and phosphate was found to increase its adsorption capacity of thorium but reduced its specific surface area (SBET). The adsorption experiments were expressed by Langmuir, Freundlich and Dubinin–Radushkevitch (D–R) isotherm models and the results of adsorption demonstrated that the adsorption of thorium onto the natural and modified zeolites correlated better with the Langmuir isotherm model than with the Freundlich isotherm model. The maximum adsorption capacity (Qo) was determined using the Langmuir isotherm model at 25 °C and was found to be 17.27, 13.83, and 10.21 mg/g for phosphate-modified zeolite, sulfate-modified zeolite, and natural zeolite, respectively. The findings of this study indicate that phosphate-modified zeolite can be utilized as an effective and low-cost adsorbent material for the removal of thorium from aqueous solutions.

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Radioactive waste treatments by using zeolites. A short review

Cited by 77 publications

References 93 publications

Applications of Nano-Zeolite in Wastewater Treatment: An Overview

Applications of Nano-Zeolite in Wastewater Treatment: An Overview

Effect of Natural Zeolite on Pore Structure of Cemented Uranium Tailings Backfill

Modification of Clinoptilolite as a Robust Adsorbent for Highly-Efficient Removal of Thorium (IV) from Aqueous Solutions

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