Removal of Tc-99(VII) by organo-modified bentonite
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2014
Authors
Milutinović Nikolić, Aleksandra
Maksin, Danijela

Jović-Jovičić, Nataša

Mirkovic, M.

Stanković, Dragana

Mojović, Zorica

Banković, Predrag

Article (Published version)

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(99)Technetium is one of the largest components of nuclear waste material. In aqueous solutions Tc-99 is present as the pertechnetate oxoanion, (TcO4-)-Tc-99, which is highly soluble and mobile in groundwater under oxidizing conditions, thus posing a major environmental concern. In this study, a series of organo-modified bentonite clay samples was tested as adsorbents for the removal of radioactive (TcO4-)-Tc-99 from aqueous solution at room temperature. The influence of the hexadecyl trimethylammonium (HDTMA)/bentonite ratio on the adsorption ability of the organobentonites was investigated. It was found that the adsorbent in which the exchangeable cations were only partially substituted with HDTMA showed very low affinity toward pertechnetate. On the other hand, the adsorbents in which the HDTMA loading exceeded the cation exchange capacity (CEC) value had high efficiency. The behavior of such adsorbents was best described by a Freundlich isotherm, while for the sample in which the H...DTMA loading was equal to the CEC, the linear adsorption isotherm was the most appropriate. The difference in adsorption performance of several adsorbents was discussed from the point of view of the interlayer arrangement of the HDTMA. The kinetics of pertechnetate adsorption on HDTMA-bentonites was tested and analyzed using different surface reaction- and diffusion-based kinetic models. For all the investigated adsorbents, the most appropriate kinetic model was the pseudo-second-order kinetics model. The obtained adsorption capacities were and HDTMA-bentonites with HDTMA loadings exceeding CEC value should be regarded as very promising adsorbents for the remediation of Tc-99 polluted waters.
Keywords:
Adsorption / Isotherm / Kinetics / Organobentonites / Pertechnetate / Radioactive wasteSource:
Applied Clay Science, 2014, 95, 294-302Publisher:
- Elsevier
Funding / projects:
- Advanced technologies for monitoring and environmental protection from chemical pollutants and radiation burden (RS-43009)
- Nanostructured Functional and Composite Materials in Catalytic and Sorption Processes (RS-45001)
DOI: 10.1016/j.clay.2014.04.027
ISSN: 0169-1317
WoS: 000338612200038
Scopus: 2-s2.0-84902110777
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IHTMTY - JOUR AU - Milutinović Nikolić, Aleksandra AU - Maksin, Danijela AU - Jović-Jovičić, Nataša AU - Mirkovic, M. AU - Stanković, Dragana AU - Mojović, Zorica AU - Banković, Predrag PY - 2014 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/1569 AB - (99)Technetium is one of the largest components of nuclear waste material. In aqueous solutions Tc-99 is present as the pertechnetate oxoanion, (TcO4-)-Tc-99, which is highly soluble and mobile in groundwater under oxidizing conditions, thus posing a major environmental concern. In this study, a series of organo-modified bentonite clay samples was tested as adsorbents for the removal of radioactive (TcO4-)-Tc-99 from aqueous solution at room temperature. The influence of the hexadecyl trimethylammonium (HDTMA)/bentonite ratio on the adsorption ability of the organobentonites was investigated. It was found that the adsorbent in which the exchangeable cations were only partially substituted with HDTMA showed very low affinity toward pertechnetate. On the other hand, the adsorbents in which the HDTMA loading exceeded the cation exchange capacity (CEC) value had high efficiency. The behavior of such adsorbents was best described by a Freundlich isotherm, while for the sample in which the HDTMA loading was equal to the CEC, the linear adsorption isotherm was the most appropriate. The difference in adsorption performance of several adsorbents was discussed from the point of view of the interlayer arrangement of the HDTMA. The kinetics of pertechnetate adsorption on HDTMA-bentonites was tested and analyzed using different surface reaction- and diffusion-based kinetic models. For all the investigated adsorbents, the most appropriate kinetic model was the pseudo-second-order kinetics model. The obtained adsorption capacities were and HDTMA-bentonites with HDTMA loadings exceeding CEC value should be regarded as very promising adsorbents for the remediation of Tc-99 polluted waters. PB - Elsevier T2 - Applied Clay Science T1 - Removal of Tc-99(VII) by organo-modified bentonite VL - 95 SP - 294 EP - 302 DO - 10.1016/j.clay.2014.04.027 ER -
@article{ author = "Milutinović Nikolić, Aleksandra and Maksin, Danijela and Jović-Jovičić, Nataša and Mirkovic, M. and Stanković, Dragana and Mojović, Zorica and Banković, Predrag", year = "2014", abstract = "(99)Technetium is one of the largest components of nuclear waste material. In aqueous solutions Tc-99 is present as the pertechnetate oxoanion, (TcO4-)-Tc-99, which is highly soluble and mobile in groundwater under oxidizing conditions, thus posing a major environmental concern. In this study, a series of organo-modified bentonite clay samples was tested as adsorbents for the removal of radioactive (TcO4-)-Tc-99 from aqueous solution at room temperature. The influence of the hexadecyl trimethylammonium (HDTMA)/bentonite ratio on the adsorption ability of the organobentonites was investigated. It was found that the adsorbent in which the exchangeable cations were only partially substituted with HDTMA showed very low affinity toward pertechnetate. On the other hand, the adsorbents in which the HDTMA loading exceeded the cation exchange capacity (CEC) value had high efficiency. The behavior of such adsorbents was best described by a Freundlich isotherm, while for the sample in which the HDTMA loading was equal to the CEC, the linear adsorption isotherm was the most appropriate. The difference in adsorption performance of several adsorbents was discussed from the point of view of the interlayer arrangement of the HDTMA. The kinetics of pertechnetate adsorption on HDTMA-bentonites was tested and analyzed using different surface reaction- and diffusion-based kinetic models. For all the investigated adsorbents, the most appropriate kinetic model was the pseudo-second-order kinetics model. The obtained adsorption capacities were and HDTMA-bentonites with HDTMA loadings exceeding CEC value should be regarded as very promising adsorbents for the remediation of Tc-99 polluted waters.", publisher = "Elsevier", journal = "Applied Clay Science", title = "Removal of Tc-99(VII) by organo-modified bentonite", volume = "95", pages = "294-302", doi = "10.1016/j.clay.2014.04.027" }
Milutinović Nikolić, A., Maksin, D., Jović-Jovičić, N., Mirkovic, M., Stanković, D., Mojović, Z.,& Banković, P.. (2014). Removal of Tc-99(VII) by organo-modified bentonite. in Applied Clay Science Elsevier., 95, 294-302. https://doi.org/10.1016/j.clay.2014.04.027
Milutinović Nikolić A, Maksin D, Jović-Jovičić N, Mirkovic M, Stanković D, Mojović Z, Banković P. Removal of Tc-99(VII) by organo-modified bentonite. in Applied Clay Science. 2014;95:294-302. doi:10.1016/j.clay.2014.04.027 .
Milutinović Nikolić, Aleksandra, Maksin, Danijela, Jović-Jovičić, Nataša, Mirkovic, M., Stanković, Dragana, Mojović, Zorica, Banković, Predrag, "Removal of Tc-99(VII) by organo-modified bentonite" in Applied Clay Science, 95 (2014):294-302, https://doi.org/10.1016/j.clay.2014.04.027 . .