Effects of ultrasound-assisted sulfuric acid treatment on the decontamination of Co nuclides in cement paste simulating radioactive concrete waste from dismantled nuclear power plants
- Authors
- Cho, Seongmin; Park, Jaeyeon; Suh, Heongwon; Kim, Gyeongryul; Lim, Jun; Seok, Seungwook; Bae, Sung Chul
- Issue Date
- Apr-2023
- Publisher
- ELSEVIER SCI LTD
- Keywords
- NPP decommissioning; Decontamination; Cement paste; Acid treatment; Ultrasonication; XANES
- Citation
- CONSTRUCTION AND BUILDING MATERIALS, v.373, pp.1 - 19
- Indexed
- SCIE
SCOPUS
- Journal Title
- CONSTRUCTION AND BUILDING MATERIALS
- Volume
- 373
- Start Page
- 1
- End Page
- 19
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/184865
- DOI
- 10.1016/j.conbuildmat.2023.130878
- ISSN
- 0950-0618
- Abstract
- This study proposes an ultrasonic treatment method for enhancing the decontamination efficiency of cement waste under the lower acid concentration. The phase transitions and decontamination efficiency of the hydrates and Co nuclides in the cement paste were respectively studied using various concentrations of sulfuric acid. The effect of pre-heating the acid-treated cement paste at 500 ℃ on its phase transition and decontamination efficiency were also studied. The underlying mechanism of the enhanced decontamination efficiency was elucidated by inductively coupled plasma spectrometry, powder X-ray diffraction, thermogravimetry, laser diffractometry, and X-ray absorption spectroscopy. Ultrasound-assisted decontamination by 1.0 M H2SO4 was 1.5 times more efficient than non-sonication-assisted decontamination with double the acid concentration (2.0 M H2SO4), owing to the detachment of the outer-layer phases of CaSO4 that obstructed the contact between the acid and the nuclides. The thermally-treated samples showed similar decontamination efficiencies under treatment with high acid concentrations and ultrasonication, due to the vigorous acid reaction kinetics regardless of the thermal decomposition of the hydrates.
- Files in This Item
-
Go to Link
- Appears in
Collections - 서울 공과대학 > 서울 건축공학부 > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/184865)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.