Evaluation of U(VI) adsorption from Ca2+ coexisted bicarbonate solution by synthetic inorganic and mineral materials
Author:
Liu Jun12, Shi Shilong1, Yin XiaoYu1, Jin Yong1, Lu Chunhai1, Zhang Qingxian1, Yang Jijun2, Liao Jiali2, Yang Yuanyou2, Liu Chunhai3, Liu Ning2
Affiliation:
1. College of Nuclear Technology and Automation Engineering , Chengdu University of Technology , Chengdu , 610059, PR China 2. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology , Sichuan University , Chengdu , 610064, PR China 3. College of Materials and Chemistry and Chemical Engineering , Chengdu University of Technology , Chengdu , PR China
Abstract
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.
Funder
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
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry
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