Collagen-based porous aerogel with high adsorption, excellent antibacterial properties, and structural stability for specific uranium capture in seawater

Abstract

Uranium plays a pivotal role in nuclear energy production, and extracting it from seawater offers a promising solution to alleviate shortages in land-based uranium resources. However, the marine environment with ultra-low uranium concentrations, high salinity, and microbial activity poses significant extraction challenges, compounded by selectivity and cost limitations in current methods. In the present investigation, an anti-biofouling amino oxime-functionalized collagen/sodium alginate aerogel (CF-AO/SA) was fabricated using leather waste-derived collagen. The dual cross-linked CF-AO/SA network, enhanced by Zn²⁺ incorporation, showed improved structural stability and antibacterial properties, as well as high uranium adsorption capacity, selectivity, and reusability. It achieved 320.7 mg g⁻¹ in 14 ppm uranium solution and maintained 78.6% removal efficiency after five cycles. Additionally, the removal rate of uranium was 89% in simulated seawater. Field tests in Zhuhai's Jinwan District (113.35° E, 21.99° N) showed 5.16 mg g⁻¹ uranium adsorption and excellent mechanical strength after 30 days in seawater. Furthermore, the production cost of CF-AO/SA was estimated at $3.652 per kilogram, which is lower than other reported adsorbents. The newly developed bio-based aerogel beads have substantial potential for practical applications for uranium capture in seawater and provide a novel high-value utilization way for leather wastes.

Keywords

Biomass-based adsorbent / Amidoxime / Double network aerogel bead / Collagen / Uranium extraction

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Funding

National Natural Science Foundation of China(52273268)

Qin Chuangyuan Team Construction Project of Shaanxi Science and Technology Department(2022KXJ-165)

The Shaanxi Province Technology Innovation Guidance Project(2023GXLH-079)

Open Foundation of Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology(KFKT2022-07)

RIGHTS & PERMISSIONS

The Author(s)