Abstract
Part weakly alkaline natural uranium-containing water contains abundant Ca2+ and (bi)carbonate. Herein, two kinds of materials, namely mesoporous hydrous manganese dioxide (MHMO) and polyacrylonitrile (PAN)/dolomite composites were synthesized and characterized to evaluate their adsorption behaviors of U(VI) from Ca2+ coexisted bicarbonate solution. Characterization results showed that both samples exhibited good structural stability after U(VI) load. MHMO could coordinate U(VI) through the surface –OH sites, whereas an unfavorable U(VI) adsorption onto mineral composites was deduced. Adsorption tests indicated that increasing Ca2+ and (bi)carbonate amounts suppress U(VI) adsorption process, and ∼19.0 mg/g U adsorbed by MHMO could be obtained in solutions with 1 mmol/L [Ca2+], 5 mmol/L [CO3]T, 50 mg/L [U(VI)]initial at pH 8.0. Moreover, a heterogeneous surface chemical adsorption was verified through kinetics and isotherms study. Results from our study should be useful in exploring the adsorption behaviors and mechanisms of U(VI) on selected inorganic and mineral materials from natural uranium-containing water.
Funding source: Foundation of Key Laboratory of Radiation PhysicsTechnology of the Ministry of EducationNational Natural Science Foundation of ChinaNational Fund of China for Fostering Talents in Basic Science
Award Identifier / Grant number: (2018SCURPT07)
Award Identifier / Grant number: (22006004, 21876123, 41774190)
Award Identifier / Grant number: (J1210004)
Acknowledgments
This work was supported by the Foundation of Key Laboratory of Radiation Physics and Technology of the Ministry of Education (2018SCURPT07), the National Natural Science Foundation of China (Grant No. 22006004, 21876123, 41774190) and the National Fund of China for Fostering Talents in Basic Science (J1210004).
Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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