1. Influence of humic acid on U(VI) elimination by ZIF-8: Synergistic chemical effect.
- Author
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Wu, Dedong, Ma, Zixuan, Liu, Lijie, Zhao, Bing, Hou, Hairui, Wang, Xiangxue, and Yu, Shujun
- Subjects
HUMIC acid ,ELECTROSTATIC interaction ,SURFACE phenomenon ,SURFACE charges ,AQUATIC ecology ,CATIONS - Abstract
ZIF-8, a sort of zeolitic imidazolate frameworks (ZIFs), had showed superior adsorptive property of typical radionuclide U(VI), but it reminded uncertain how the performance of ZIF-8 would be affected by adding humic acid (HA). HA could significantly change the surface charge of ZIFs and the transport of U(VI) in natural settings, which affected the eradication of U(VI) in aquatic ecology. Thus the impact of HA for the U(VI) removal by ZIF-8 as well as its mechanism had been analyzed by batch experiments and spectral analyses. It was demonstrated that the addition of HA increased the maximum removal capacity towards U(VI) from 781.2 mg g
−1 to 1398.5 mg g−1 . Moreover, removal property in acidic solution was improved, and the influence of background ions on ZIF-8 was reduced. The detailed mechanism was further explored by microscopic spectral analysis. The zeta potential showed that HA enhanced the electronegativity of ZIF-8 thus enhancing the electrostatic interaction with positive ions. Moreover, FT-IR and XPS further indicated that HA enhanced the removal capacity by affecting the surface complexation phenomena and strong chemical interactions between U(VI) and ZIF-8. Also, investigations indicated that the incorporation of HA improved the removal efficiency for U(VI), which had far-reaching significance for the application of ZIF-8 in practical environment. [Display omitted] • The effect of humic acid on the physicochemical properties of ZIF-8 was studied. • A fresh thinking for future research in practical application are prompted. • The influence of HA on the adsorption of uranium by ZIF-8 was studied. • The mechanisms are surface complexation and electrostatic interactions. • HA as a natural substance is more environmentally friendly in wastewater treatment. [ABSTRACT FROM AUTHOR]- Published
- 2023
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