Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 424, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127208
Keywords
Halloysite nanotubes; Polydopamine; Modification; U(VI) adsorption
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Funding
- National Natural Science Foundation of China [22076034, 41877290]
- Natural Science Foundation of Guangdong Province of China [2021A1515010067]
- Foundation of Department of Education of Guangdong Province of China [2018KTSCX176]
- Guangzhou University Intramural Scientific Research Project [YG2020012]
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Halloysite nanotubes (HNTs) are structurally promising adsorption materials, with their adsorption capacity for radioactive U(VI) significantly improved by synthesizing composite adsorbents (HNTs@PDA) with different polydopamine (PDA) layer thicknesses. The study investigates the effects of solution pH, temperature, and coexisting ions on the adsorption process, and provides insights into the adsorption mechanism of U(VI) by HNTs@PDA, contributing basic information for the application of HNTs for U(VI) removal.
Halloysite nanotubes (HNTs) are considered structurally promising adsorption materials, but their application is limited due to their poor native adsorption properties. Improving the adsorption capacity of HNTs for radioactive U(VI) is of great significance. By controlling the mass ratio of HNTs and dopamine (DA), composite adsorbents (HNTs@PDA) with different polydopamine (PDA) layer thicknesses were synthesized. Characterization of HNTs@PDA demonstrated that the original structure of the HNTs was maintained. Adsorption experiments verified that the adsorption capacity of HNTs@PDA for U(VI) was significantly improved. The effects of solution pH, temperature, and coexisting ions on the adsorption process were investigated. The removal efficiency was observed to be 75% after five repeated uses. The adsorption mechanism of U(VI) by HNTs@PDA can be explained by considering electrostatic interactions and the complexation of C-O, -NH- and C-N/C--N in the PDA layer. This study provides some basic information for the application of HNTs for U(VI) removal.
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