期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 10, 期 6, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.108592
关键词
Polydopamine; Uranium; Adsorption; Phosphate; Soil remediation
资金
- National Key Research and Development Program of China
- National Natural Science Foundation of China
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- [2020YFC1806602]
- [21876178]
In this study, a magnetic h-Fe3O4 @phos-PDA nanocomposite with excellent adsorption properties was successfully prepared. The nanocomposite showed high adsorption capacity for U(VI) and reduced the radiation intensity in uranium-contaminated soil, demonstrating its great engineering application potential.
In this work, a magnetic h-Fe3O4 @phos-PDA nanocomposite composed of ferroferric oxide hollow nanosphere and phosphate-modified polydopamine shell was successfully prepared by a facile one-step method. The h-Fe3O4 @phos-PDA nanocomposite has excellent adsorption properties for U (VI) under the action of phosphate and amine functional groups. The maximum adsorption capacity of h-Fe3O4 @phos-PDA for U(VI) in pH= 5 aqueous solution reached 526.35 mg/g at 298 K, and the adsorption process conformed to the Langmuir isotherm model. The analysis of kinetic adsorption data educed that the adsorption process followed the pseudo-second-order model and reached equilibrium in just 16 min. XPS analysis indicated that phosphate and amine functional groups play a vital role in the complexation between the phos-PDA shell and U (VI). In addition, actual soil remediation experiments indicated that the h-Fe3O4 @phos-PDA nanocomposite could reduce the radiation in-tensity of alpha-ray in uranium-contaminated soil by about 82.3%, demonstrating its great engineering application potential.
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