Removal of radioactive cesium, strontium, and iodine from natural waters using bentonite, zeolite, and activated carbon

Kubota, Takumi; Fukutani, Satoshi; Ohta, Tomoko; Mahara, Yasunori

doi:10.1007/s10967-012-2068-4

Cited by 65 publications

(30 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Radioactive substances can be removed with high efficiency using artificial zeolites instead of natural zeolites. 6) However, artificial zeolites have poor sinterability and have a disadvantage that their handling, for example, in recovery from water, is difficult because they are mainly obtained as a powder. As an alternative to sintering, it is possible to solidify zeolites using various binders, but the binders may clog the characteristic pores of zeolites, interfering with the removal of radioactive substances.…”

Section: )4)mentioning

confidence: 99%

Ion-exchange properties of zeolite/glass hybrid materials

Taira

Yoshida

Fukushima

2017

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

Hybrid materials were prepared from ground glass powder and various zeolites such as A-type, mordenite, X-type, and Y-type zeolites, and their ion removal effect was investigated. The hybrid materials of A-type, Y-type, and mordenite zeolites showed similar Sr 2+ removal rates from aqueous solutions. The removal rate of Sr 2+ ions increased as the amount of zeolite in the hybrid materials increased. Compared with other hybrid materials, the hybrid materials of X-type zeolite showed higher Sr 2+ removal rates, especially for zeolite content greater than 25%. As the amount of X-type zeolite in the hybrid materials increased, the Sr 2+ removal rate increased greatly, with a 100% removal rate when the content of X-type zeolite exceeded 62.5%.©2017 The Ceramic Society of Japan. All rights reserved.Key-words : Hybrid materials, Zeolite, Ground glass, Ion exchange [Received February 13, 2017; Accepted March 10, 2017] Zeolites are microporous crystalline materials with uniform and molecular-sized pores and have high cation-exchange capacity similar to other clay minerals. Since they have particularly high selective exchange characteristics, natural zeolites have been studied extensively for treating water containing radioisotopes. 1)4)Natural zeolites such as mordenite, erionite, chabazite, and clinoptilolite have shown an extremely high radioisotope removal rate in radioactive wastewater, 5) although they have disadvantages such as small exchange capacity and collapse of particles. Radioactive substances can be removed with high efficiency using artificial zeolites instead of natural zeolites. 6) However, artificial zeolites have poor sinterability and have a disadvantage that their handling, for example, in recovery from water, is difficult because they are mainly obtained as a powder. As an alternative to sintering, it is possible to solidify zeolites using various binders, but the binders may clog the characteristic pores of zeolites, interfering with the removal of radioactive substances. Kamitani et al. have reported that a pellet-like sample of hybrid materials of soda-lime glass and A-type zeolite can remove cesium and strontium ions. 7)Although hybrid materials from zeolites and soda-lime glass are interesting and attractive as an ion-exchange material, there is no report on hybrid materials using other types of zeolites. The Si/Al ratio of A-type zeolite is equal to 1, which is the minimum value for zeolites. X-type and Y-type zeolites have the same crystallographic structure of faujasite with a difference in the Si/Al ratio giving rise to distinct chemical properties. The Si/Al ratio is 11.5 for X-type, 1.53 for Y-type, and 5.0 for mordenite zeolites. 8)Thus, the use of other zeolites in hybrid materials is expected to lead to further progress in the ion-exchange field. In this study, therefore, hybrid materials of soda-lime glass with mordenite, X-type, and Y-type zeolites in addition to A-type zeolite were prepared and their ion removal effect was investigated.Samples of hybrid materials were prepared fr...

show abstract

Section: )4)mentioning

confidence: 99%

Ion-exchange properties of zeolite/glass hybrid materials

Taira

Yoshida

Fukushima

2017

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

show abstract

“…These are activated carbon [1,2], hydrous metal oxides [3] or titanates and silicotitanates [4,5], hydroxyapatite [6], zeolites [7][8][9], clays [10,11]. To increase selectivity of natural minerals towards radionuclides, several methods have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Sorption of strontium on the composite sorbent based on cellulose and hydrated antimony pentoxide

Galysh¹,

Кartel²,

Janusz³

et al. 2017

Him. Fiz. Tehnol. Poverhni

View full text Add to dashboard Cite

show abstract

“…Therefore 90 Sr is a contamination that must be removed. Treatment of liquid radioactive waste quite often involves the application of several methods such as filtration, precipitation, sorption, ion exchange and membrane separation to meet the requirements for the release of decontaminated effluents into the environment [5][6][7][8][9][10][11]. Adsorption has become one of the most commonly used separation methods due to its simplicity, selectivity and efficiency [12,13].…”

Section: Introductionmentioning

confidence: 99%