期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 706, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.136019
关键词
Polyphosphazene; Amidate; Uranium; Adsorption; Doped
资金
- National Natural Science Foundation of China [11705027, 11605027, 21966005, 216610003, 41867063]
- Opening fund project of State Key Laboratory of Nuclear Resources and Environment, East China University of Technology [NRE1926]
- Natural Science Foundation of Jiangxi Province [20192BAB202007, 20192ACB21001]
Herein, the precursor polyphosphazene was synthesized by the polymerization of hexachlorocyclotriphosphazene (HCCP) and bis(4-hydroxyphenyl) sulfone (BPS). The adsorbent which was codoped with N, P and S (amidate-CS) was developed from the precursor by using the carbonization method. The images of Scanning electron microscope (SEM) and Transmission electron microscope (TEM) indicate that the amiclate-CS possessed porous graphene-like carbon lamellar structure. The excellent behaviors with respect to kinetics (120 min for equilibrium) and thermodynamics (maximum removal 01290 mg/g when pH was at 6.0) revealed the outstanding performance of amidate-CS in removing U(VI), which is due to the functional groups and strong covalent bonds between heteroatoms and uranyl ions. The adsorption of amidate-CS followed the pseudo-second-order kinetic and Langmuir adsorption model. The thermodynamic parameters indicate that the process was spontaneous and endothermic. The adsorption and desorption efficiency of amidate-CS had a slight decrease after five cycles, indicating excellent regeneration performance. Overall, the amidate-CS is a prospective candidate for highly selective U(VI) removing. (C) 2019 Elsevier B.V. All rights reserved.
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