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09-07-2020 | Original Research | Issue 13/2020

Cellulose 13/2020

Experimental and theoretical studies of chitosan modified titanium dioxide composites for uranium and europium removal

Journal:
Cellulose > Issue 13/2020
Authors:
Jian Wang, Yingzhong Huo, Yuejie Ai
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Abstract

Chitosan grafted titanium dioxide (CS/TiO2) was synthesized to remove U(VI) and Eu(III) from aqueous solutions. The experimental results demonstrated that the removal of radionuclides was dependent on pH. The simultaneous elimination of U(VI) and Eu(III) proved that the presence of Eu(III) competed with U(VI) adsorption and caused the decreased elimination of U(VI) and vice versa. The retention of U(VI) on CS/TiO2 relied on the hydroxyl groups, and the Eu(III) removal could be attributed to the amidogen groups. DFT calculation results demonstrated that the most likely adsorption site was located between the chitosan and titanium dioxide. The adsorption of radionuclides on CS/TiO2 was the combinations of various adsorption situations. This study can contribute to the simultaneous adsorption of radionuclides and provide important information for removal of other contaminants.

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