Preparation of chitosan graft benzo-15-crown-5/non-woven fabric composite membrane for enhanced Pd²⁺ adsorptive separation

ABSTRACT

Based on the selectively complexing properties of crown ethers for metal ions, a chitosan-graft-benzo-15-crown-5 ether (CTS-g-B15C5)/non-woven fabric (NWF) composite membrane with sponge-like pore structure was prepared. A flow-through dynamic adsorption method was used to investigate the adsorptive separation performance for Pd²⁺. The thermodynamic analysis revealed that Pd²⁺ adsorption on the composite membrane was a spontaneous procedure in which the high temperature would benefit the adsorption. Moreover, the composite membrane showed excellent reusability after regeneration, and there was no obvious loss of adsorption amount after five cycles. Finally, the CTS-g-B15C5/NWF composite membrane retained high selectivity for Pd²⁺ in simulated nuclear wastewater.

KEYWORDS:

• Chitosan
• crown ether
• composite membrane
• adsorption

Acknowledgements

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (Grant No. 21808166 and 51303130), the Natural Science Foundation of Tianjin (No. 18JCYBJC89300), and the PetroChina Innovation Foundation (No. 2019D-5007-0209).

Disclosure statement

The authors declare that they have no conflict of interest.

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Additional information

Funding

This work was supported by the National Natural Science Foundation of China [21808166, 51303130]; The PetroChina Innovation Foundation [2019D-5007-0209]; The Natural Science Foundation of Tianjin [18JCYBJC89300].