Solar driven enhanced adsorption of radioactive Cs+ and Sr2+ from nuclear wastewater by chitosan-based aerogel embedded with Prussian blue analog,Journal of Hazardous Materials

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Solar driven enhanced adsorption of radioactive Cs+ and Sr2+ from nuclear wastewater by chitosan-based aerogel embedded with Prussian blue analog
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-12-20 , DOI: 10.1016/j.jhazmat.2024.136955
Na Yang, Xu Guo, Jing Yu, Qi Liu, Jingyuan Liu, Jiahui Zhu, Rongrong Chen, Jun Wang

The rational use of solar energy to achieve photothermal conversion is an attractive strategy to promote the efficient removal of radioactive Cs⁺ and Sr²⁺ from nuclear wastewater. Herein, a photothermal adsorbent of composite aerogel with three-dimensional porous structure is fabricated by integrating prussian blue analogues (PBAs) and straw biochar into the chitosan (CS) and waste leather scrap hydrolysate (WLSH) aerogel matrix (CS/WLSH/C/PBAs). The local heating effect generated by CS/WLSH/C/PBAs aerogel induce to generate steam, accelerating the enrichment of Cs⁺ and Sr²⁺ in the solution, which increase their interaction with the CS/WLSH/C/PBAs and improves their adsorption rates and capacities. Under simulated sunlight, the adsorption equilibrium times for Cs⁺ and Sr²⁺ by CS/WLSH/C/PBAs are shortened from 5 h in the dark condition to 2 h, with maximum adsorption capacities of 156.0 and 95.1 mg/g for Cs⁺ and Sr²⁺, respectively. Meanwhile, the CS/WLSH/C/PBAs aerogel also exhibits excellent reusability. Notably, the Cs⁺ and Sr²⁺ still can be efficiently removed in simulated seawater. Encouragingly, the CS/WLSH/C/PBAs aerogel also exhibits excellent adsorption properties for dyes and oils. This work provides insights for the design of multifunctional and efficient composite adsorbents, and paving a promising way for enhancing the adsorption of Cs⁺ and Sr²⁺ through solar energy.

更新日期：2024-12-20

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