Ridge cultured rice integrated with fish farming in trenches, Anhui Province

Meeting: National Rice Fish Farming Systems Symposium, 4-8 Oct. 1988, Wuxi, CNIn IDL-1614

N, P and S co-doped carbon materials derived from polyphosphazene for enhanced selective U(VI) adsorption

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.We appreciate the financial support from the National Natural Science Foundation of China (11705027, 11605027, 21966005, 216610003, 41867063), the Opening fund project of State Key Laboratory of Nuclear Resources and Environment, East China University of Technology (NRE1926), the Natural Science Foundation of Jiangxi Province (20192BAB202007, 20192ACB21001)