Synthesis of thickness-controllable polydopamine modified halloysite nanotubes (HNTs@PDA) for uranium (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...

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Bibliographic Details
Published in:Journal of hazardous materials 2022-02, Vol.424 (Pt A), p.127208-127208, Article 127208
Main Authors: Ou, Tao, Wu, Yuhua, Han, Weixing, Kong, Lingjun, Song, Gang, Chen, Diyun, Su, Minhua
Format: Article
Language:English
Subjects:
Clay
Halloysite nanotubes
Indoles
Modification
Nanotubes
Polydopamine
Polymers
U(VI) adsorption
Uranium
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Summary: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/CN in the PDA layer. This study provides some basic information for the application of HNTs for U(VI) removal. [Display omitted] •A unique tube-membrane structure with a thickness-controllable PDA layer was synthesized.•Adsorption capacity for U(VI) was enhanced by PDA modification.•HNTs@PDA showed excellent recyclable performance.•The –OH and –NH– in the catechol group contributed to U(VI) binding on HNTs@PDA.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2021.127208