Construction of hierarchical porous and polydopamine/salicylaldoxime functionalized zeolitic imidazolate framework-8 via controlled etching for uranium adsorption

Kai Tuo; Jin Li; Yi Li; Chuyao Liang; Cuicui Shao; Weifeng Hou; Zhijian Li; Shouzhi Pu; Chunhui Deng

doi:10.1039/d3mh02108d

Construction of hierarchical porous and polydopamine/salicylaldoxime functionalized zeolitic imidazolate framework-8 via controlled etching for uranium adsorption

Mater Horiz. 2024 Apr 30. doi: 10.1039/d3mh02108d. Online ahead of print.

Authors

Kai Tuo¹, Jin Li¹, Yi Li¹, Chuyao Liang¹, Cuicui Shao¹, Weifeng Hou¹, Zhijian Li¹, Shouzhi Pu², Chunhui Deng³

Affiliations

¹ Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China. lizhijianhdd@163.com.
² YuZhang Normal University, Nanchang 330013, PR China. pushouzhi@tsinghua.org.cn.
³ Shanghai Pudong Hospital, and Department of Chemistry, Fudan University, Shanghai 201399, China. chdeng@fudan.edu.cn.

PMID: 38686502
DOI: 10.1039/d3mh02108d

Abstract

Efficient uranium extraction from seawater is critical for the development of the nuclear industry. Herein, a polydopamine/salicylaldoxime decorated hierarchical zeolitic imidazolate framework-8 (H-PDA/SA-ZIF-8) is constructed by using a controlled etching process. Benefiting from the combination of PDA/SA and the zeolitic imidazolate framework-8 (ZIF-8), as well as a controlled etching process, the H-PDA/SA-ZIF-8 possesses multiaffinity sites, excellent specific surface area (1234.92 m² g^-1), and a hierarchical pore structure. The H-PDA/SA-ZIF-8 exhibits excellent adsorption capacity (Q_m = 869.6 mg g^-1), selectivity, and reusability in uranium adsorption. The adsorption process of H-PDA/SA-ZIF-8 fits very well with the Langmuir isotherm model and pseudo-second-order models, and the adsorption process equilibrates within 20 min (C₀ = 20 mg L^-1). Furthermore, the H-PDA/SA-ZIF-8 shows remarkable antibacterial ability. Impressively, the adsorption capacity of H-PDA/SA-ZIF-8 to uranium in natural seawater reaches 6.9 mg g^-1 after circulation for 15 days. Therefore, the H-PDA/SA-ZIF-8 is a promising and fascinating material for uranium extraction from natural seawater.