1. Immobilization of uranium by S-NZVI and UiO-66-NO2 composite through combined adsorption and reduction.
- Author
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Zhang, Di, Tang, Hao, Zhao, Bing, Liu, Lijie, Pang, Hongwei, Wang, Xiangxue, and Yu, Shujun
- Subjects
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PHYSISORPTION , *ENVIRONMENTAL security , *ADSORPTION capacity , *POLLUTION , *ENERGY development , *URANIUM , *ADSORPTION (Chemistry) - Abstract
Radioactive uranium removal plays a key role in energy development and environmental security. Sulfide nanoscale zero-valent iron (S-NZVI) has good antioxidant capacity, dispersibility and activity to eliminate U(VI) from wastewater, but the removal efficiency is limited. To improve the reduction and adsorption capacity of S-NZVI, through treating Fe3+ solution by nitro-functionalized UiO-66 (UiO-66-NO 2) with high porosity, UiO-66-NO 2 enhanced S-NZVI adsorbent (S-NZVI/UiO-66) was prepared by liquid phase reduction method. The smaller size and larger specific surface area of S-NZVI/UiO-66 were confirmed by a variety of characterization techniques. Based on the excellent surface structure and reactivity, the U(VI) removal capacity of S-NZVI/UiO-66 (895 mg g−1) was much better than S-NZVI (434 mg g−1) and UiO-66-NO 2 (267 mg g−1). The impacts of pH, background ion strength, coexisting ions and different water environments on adsorption were studied via macroscopic batch experiments. The results showed that S-NZVI/UiO-66 could remove U(VI) adequately in a wide pH range. The removal rate was basically not affected by the concentration of NaNO 3 , demonstrating that the adsorption process of U(VI) on S-NZVI/UiO-66 tended to inner surface complexation. From XPS technique combined with the results of batch adsorption experiments, it was clear that the elimination mechanisms of U(VI) by S-NZVI/UiO-66 were mainly the physical adsorption, electrostatic attraction and complexation of UiO-66-NO 2 , and the reduction and complexation of S-NZVI. Therefore, it is believed that S-NZVI/UiO-66 has a great potential to be an excellent adsorbent in the field of the environment remediation. Moreover, S-NZVI/UiO-66 promises to be a novel nanomaterial for solving the problem of radionuclide contamination in practical environments. [Display omitted] • The pretreatment of UiO-66-NO 2 can effectively reduce the size of S-NZVI. • S-NZVI/UiO had a better specific surface area than the original S-NZVI. • The practical application potential of S-NZVI/UiO was confirmed. • The removal mechanisms were adsorption and reduction. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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