期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 694, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.133697
关键词
U(VI); Adsorption; Phosphate groups; Hydrothermal carbon spheres
资金
- Science Challenge Project [TZ2016004]
- National Key Research and Development Program of China [2018YFC1900105]
- NSFC [21607042, 21707033, 21836001]
- Fundamental Research Funds for the Central Universities [2018ZD11, 2017MS045]
A promising strategy for radionuclides immobilization on the functionalized carbon-based materials is a pursuing issue. Here, we developed phosphorylated hydrothermal carbon spheres (HCSs@PO4) through chemical-grafted method using phytic acid as a phosphorus source. When served as U(VI) scavenger from simulated environmental wastewater, the resulting HCSs@PO4 showed excellent adsorption capacity toward U(VI) (552.49 mg.g(-1) at pH 5.0 and T= 298 K), outperforming that of HCSs (32.06 mg.g(-1)) and state-of the-artmaterials. A weak ionic strength-dependence of U(VI) enrichment with HCSs@PO4 was investigated by a series of pH experiments, indicating an inner-sphere surface complexation. Through thermodynamic study, high temperature promoted the adsorptive ability of HCSs@PO4 toward U(VI), revealing the endothermic and spontaneous nature. Additional selective adsorption applications were conducted to evaluate the ability of HCSs@PO4 to capture uranium fission by products and other radioactive ions. Analyses of characteristic means (FT-IR and XPS) revealed enhanced uptake performance of HCSs@PO4 originated from grafting abundant phosphate groups, which exhibited the stronger surface complexation toward U(VI) than sluggish hydroxyl and carboxyl groups. The findings herein highlighted a facile and powerful technique for the manufacture of phosphorylated carbon-based materials of radioactive wastewater remediation. (C) 2019 Elsevier B.V. All rights reserved.
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