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Macroporous and ultralight polyethyleneimine-grafted chitosan/nano-TiO2 foam as a novel adsorbent with antibacterial activity for the efficient U(VI) removal

The radioactive contamination from the excessive discharge of uranium-containing wastewater seriously threatens environmental safety and human health. Herein, macroporous and ultralight polyethyleneimine-grafted chitosan/nano-TiO2 composite foam (PCT) with antibacterial activity was synthesized, whi...

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Published in:International journal of biological macromolecules 2023-12, Vol.253, p.126966-126966, Article 126966
Main Authors: Ao, Xianqian, Zhou, Limin, Jin, Jieyun, Liu, Yanlin, Ouyang, Jinbo, Liu, Zhirong, Shehzad, Hamza
Format: Article
Language:English
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Summary:The radioactive contamination from the excessive discharge of uranium-containing wastewater seriously threatens environmental safety and human health. Herein, macroporous and ultralight polyethyleneimine-grafted chitosan/nano-TiO2 composite foam (PCT) with antibacterial activity was synthesized, which could quickly remove U(VI) from solution. Among different PCT adsorbents, PCT-2 had the best adsorption performance for U(VI), which could be due to its honeycomb macroporous structures and the presence of abundant amino/imine groups. The kinetics and adsorption isotherms data were found in agreement with the pseudo-second-order model and the Langmuir model, respectively, indicating chemisorption or complexation as the main adsorption mechanism. The saturated adsorption capacity of PCT-2 for U(VI) reaches 259.91 mg/g at pH 5.0 and 298 K. The PCT-2 also presents good selectivity for U(VI) with the coefficient (βU/M) order of Na+ > K+ > Mg2+ > Ca2+ > Ni2+ > Co2+ > Mn2+ > Al3+ > Fe3+ > Cu2+. The adsorption mechanism was explored using FT-IR and XPS analysis, indicating that amino/imine groups and hydroxyl groups are responsible for U(VI) complexation. Thermodynamic calculations show that U(VI) adsorption is endothermic and spontaneous. The ease of preparation, excellent adsorption performance and environmental friendliness of PCT-2 make it a novel adsorbent with antibacterial activity for radioactive contamination control. •Macroporous and ultralight polyethyleneimine-grafted chitosan/nano-TiO2 foam was prepared.•Polyethyleneimine provides –NH/NH2 active sites while nano-TiO2 can avoid the collapse of pores.•PCT-2 showed best adsorption performance for U(VI) removal among various composites.•The main mechanism is related to U(VI) complexation by amine/imine and hydroxyl groups.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2023.126966