Pertechnetate removal from aqueous solution using activated carbon modified with oxidizing and reducing agents

The adsorption mechanism of pertechnetate on activated carbon (AC) has been studied. For this work, the surface of commercial AC was modified using various oxidizing and reducing agents. The changes of surface functional groups were monitored by FT-IR spectroscopy and Boehm titration. The distributi...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2018-06, Vol.316 (3), p.1281-1288
Main Authors: Park, Jai-Il, Cho, Hye-Ryun, Choi, Kwang-Soon, Park, Kyoung-Kyun, Park, Yeong-Jae
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Fourier transforms
Functional groups
Hadrons
Heavy Ions
Infrared spectroscopy
Inorganic Chemistry
Nuclear Chemistry
Nuclear Physics
Oxidation
Physical Chemistry
Reducing agents
Surface chemistry
Titration
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Summary:The adsorption mechanism of pertechnetate on activated carbon (AC) has been studied. For this work, the surface of commercial AC was modified using various oxidizing and reducing agents. The changes of surface functional groups were monitored by FT-IR spectroscopy and Boehm titration. The distribution coefficient ( K d ) of TcO 4 − on the modified AC has been determined. In acidic media, the value of K d slightly increased owing to the reductive treatment of ACs, whereas a large decrease in K d was observed in case of oxidative treatment of ACs. Based on this work, the previous adsorption mechanisms for TcO 4 − on AC were examined. As an alternative adsorption mechanism, the adsorption by electrostatic attraction between TcO 4 − and protonated basic sites on AC surface was proposed.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-018-5769-5