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Title: N, P and S co-doped carbon materials derived from polyphosphazene for enhanced selective U(VI) adsorption
Authors: Liu, Yan
Ouyang, Yunfei
Huang, Dejuan
Jiang, Chao
Liu, Xiaopeng
Wang, Yun
Dai, Ying
Yuan, Dingzhong
Chew, Jia Wei
Keywords: Engineering::Chemical engineering
Issue Date: 2020
Source: Liu, Y., Ouyang, Y., Huang, D., Jiang, C., Liu, X., Wang, Y., Dai, Y., Yuan, D. & Chew, J. W. (2020). N, P and S co-doped carbon materials derived from polyphosphazene for enhanced selective U(VI) adsorption. Science of the Total Environment, 706, 136019-.
Journal: Science of the Total Environment
Abstract: 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 amidate-CS possessed porous graphene-like carbon lamellar structure. The excellent behaviors with respect to kinetics (120 min for equilibrium) and thermodynamics (maximum removal of 290 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.
ISSN: 0048-9697
DOI: 10.1016/j.scitotenv.2019.136019
Rights: © 2019 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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