13-18 May 2018
Casino Conference Centre
Europe/Prague timezone

Characterization of different bentonite and its application in the sorption of Cs and Sr from aqueous solution by bentonite-alginate microcapsules

15 May 2018, 09:15
15m
Marble Hall (Casino Conference Centre)

Marble Hall

Casino Conference Centre

Reitenbergerova 4/95, Mariánské Lázně, Czech Republic
Verbal Chemistry of Nuclear Fuel Cycle, Radiochemical Problems in Nuclear Waste Management NFC 2

Speaker

CHUAN-PIN LEE (Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan)

Description

The bentonite materials are frequently designed as buffer/backfill material for engineered barrier in final disposal for spent nuclear fuels (SNFs) or high-level radioactive waste (HLW) repository. The clay minerals showed a favourable environment for sorption of Cs and Sr, bentonite having high sorption toward Cs and Sr were encapsulated in the biopolymer matrices (sodium alginate, NaALG) in this study. The characterization of bentonite-alginate microcapsules (MCs) enclosing different bentonite (Taiwan, China, U.S) was examined and analysed by SEM, and the sorption of Cs and Sr in different bentonite-alginate MCs was investigated by batch methods. Spherical and elastic granules were obtained, and the particle size of microcapsules was about 500 -700 μm. A relatively higher distribution coefficient (Kd) of Cs for bentonite-alginate MCs than Sr. The sorption isotherm of Cs and Sr followed a Langmuir-type equation and it indicated that the sorption capacity of different bentonite-alginate MCs in Cs were ( 233.96 - 266.57mg/g) higher than Sr ( 19.40 - 63.01mg/g). In fact, the ZH bentonite-alginate MCs has a lowest sorption capacity for Sr due to the ZH bentonite is Ca-type bentonite and the higher Ca2+ component and pyrite (FeS) mineral would may have a soption competetion with Sr2+ in the solution.

Primary authors

CHUAN-PIN LEE (Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan) Prof. Ming-Chee Wu (Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan) Dr Shih-Chin Tsai Dr Tsuey-Lin Tsai Dr Chun-Hua Pan

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