Irradiation-stable hydrous titanium oxide-immobilized collagen fibers for uranium removal from radioactive wastewater. (1st April 2021)

• Record Type: Journal Article
• Authors: Tang, Yi; Zhou, Jibo; Guo, Junling; Liao, Xuepin; Shi, Bi
• Is Part Of: Journal of environmental management. Volume 283(2021)
• Publication Date: 2021-04-01
• Subjects: Adsorption -- Uranium recovery -- Mass transfer resistance -- Breakthrough curve -- Radioactive water -- Immobilized collagen fibers; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2021.112001
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Developing efficient adsorbents with radiation stability for uranium removal from nuclear wastewater is greatly important for resource sustainability and environmental safety in manufacturing nuclear fuel. A novel adsorbent of hydrous titanium oxide-immobilized collagen fibers (HTO/CFs) with good radiation stability for UO2 2+ removal was developed. Results showed that the adsorption capacity of HTO/CFs for UO2 2+ was 1.379 mmol g −1 at 303 K and pH 5.0 when the initial concentration of UO2 2+ was 2.5 mmol L −1 . Moreover, HTO/CFs showed high selectivity for U(VI) in bilateral mixed solution including UO2 2+ with another coexisting ion, such as Cl −, NO3 −, Zn 2+, and Mg 2+ . The adsorption behavior of UO2 2+ from radioactive wastewater on HTO/CF column was also investigated, and the breakthrough point was approximately 250 BV (bed volume). Notably, the HTO/CFs column can be rapidly regenerated by using only 4.0 BV of 0.1 mol L −1 HNO3 solution. The regenerated HTO/CFs column exhibited slight change in the breakthrough curve, suggesting its excellent reapplication ability. Furthermore, after irradiation under 60 Co γ-ray at total doses of 10–350 kGy, HTO/CFs still preserved fibrous morphology and adsorption capacity, indicating significant radiation stability. These results demonstrate that HTO/CFs are industrial scalable adsorbents for the adsorptive recovery of uranium. Graphical abstract: Image 1 Highlights: A novel fibrous adsorbent (HTO/CFs) was prepared by surface immobilization of hydrous titanium oxide (HTO) on CFs. HTO/CFs exhibit high adsorption capacity, high selectivity for UO2 2+ and significant radiation stability. HTO/CFs are suitable for column adsorption attributed to the low mass transfer resistance of fibrous structure. HTO/CFs column can be rapidly regenerated, suggesting its excellent reapplication ability.