A functionalized nanocomposite adsorbent for the sequential removal of radioactive iodine and cobalt ions in aqueous med
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
A functionalized nanocomposite adsorbent for the sequential removal of radioactive iodine and cobalt ions in aqueous media Jung Eun Park*,‡, Ha Eun Shim**,‡, Sajid Mushtaq***, Yong Jun Choi****, and Jongho Jeon*,† *Department of Applied Chemistry, School of Applied Chemical Engineering, Kyungpook National University, Daegu 41566, Korea **Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup 56212, Korea ***Department of Nuclear Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad, 45650, Pakistan ****School of Environmental Engineering, University of Seoul, Seoul 02504, Korea (Received 24 June 2020 • Revised 20 August 2020 • Accepted 26 August 2020) AbstractThe need for efficient remediation of the radioactive waste caused by undesirable nuclear accidents and overspending of radionuclides has gained worldwide attention, with extensive recent efforts made to protect the environment from radioactive contamination. Although various treatment processes for the removal of radionuclides and the purification of liquid waste have been reported, the development of a better decontamination method is still necessary for obtaining enhanced desalination performances. Herein, we report a dual-functional composite adsorbent composed of a cellulose acetate membrane as a solid support, gold nanoparticles (AuNPs), and a metal chelating agent which can potentially be used to efficiently remove radioactive iodine and cobalt. In the desalination experiments, the sorption membrane was able to remove cobalt ions rapidly in water. Isotherm data shows that approximately 180 Co2+ atoms were captured per AuNP. Next, the same material was used for the adsorption of iodide anions. Within a few minutes, more than 99% of radioactive iodine was removed even in the presence of other ion species. These findings clearly demonstrate that the desalination method presented in here provides a useful approach for the sequential removal of toxic metal and halogen species in aqueous media. Keywords: Desalination, Composite Materials, Nanoadsorbents, Radioactive Wastes, Adsorption
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I) is discharged by many medical institutions [6,7]. In addition, radioactive cobalt (60Co) is typically produced as a by-product from the neutron activation of iron isotopes in the reactor’s steel structures during nuclear power plant operation [8]. It is also a target species that must be removed during the maintenance or decommissioning of nuclear reactors. Moreover, radioactive cobalt is widely utilized as a useful radiation source in several industrial applications that include security screenings, sterilization, food irradiation, and radiation therapy [9,10]. The wide use of such radionuclides requires efficient decontamination processes for managing radioactive waste. Previously, we reported that gold nanoparticles (AuNPs) immobilized on a polymeric matrix are an excellent sorbent for remediating radioactive iodines [11-14]. Usi
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