4.7 Article

Effective removal of metal ions and cationic dyes from aqueous solution using different hydrazine-dopamine modified sodium alginate

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出版社

ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.12.039

关键词

Sodium alginate; Hydrazide; dopamine modified; Metal ions; Cationic dye; Adsorption

资金

  1. Sichuan Youth Science and Technology Innovation Research Team Project [2020JDTD0018]
  2. Project on Characteristic Key Laboratory of Guizhou Ordinary Colleges and Universities by Department of Education of Guizhou Province [Qian Jiao He KY Zi [2018] 003]
  3. A project of Guizhou Province Science and Technology Program [Qian Ke He Ji Chu [2019] 1295]
  4. Moutai Institute Joint Science and Technology Cooperation Fund Project, Zunyi Ke He Hz [2021] [333]

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DSA-AAD-DA and DSA-TPDH-DA were successfully prepared for efficient removal of metal ions and cationic dyes from aqueous solution. Both materials showed excellent adsorption performance, with DSA-TPDH-DA displaying higher removal efficiency compared to DSA-AAD-DA. Furthermore, the adsorption capacity of both materials remained above 80% even after five cycles of adsorption-desorption, highlighting their potential for wastewater treatment.
In this paper, DSA-AAD-DA and DSA-TPDH-DA were prepared to effectively remove metal ions and cationic dyes from aqueous solution. The hydrazone structure was prepared by hydrazide-modified SA which captured metal ions selectively, and the remaining functional groups were used as active adsorption sites for cationic dyes. The thermodynamic parameter for the sorption demonstrated the process is endothermic and spontaneous. In single process, the adsorption of metal ions by DSA-AAD-DA and DSA-TPDH-DA correlated well with the Freundlich model through the hydrazone structure coordination and ion exchange which was mainly chemical adsorption, and cationic dyes adsorption correlated well with the Langmuir model which was shown monolayer adsorption was dominant by hydrogen bonding, electrostatic interaction, and pi-pi interaction. In binary system, the mixed adsorption shown significant antagonism effect in high concentration, but cationic dyes and metal ions in low concentration were efficiently and simultaneously removed, the adsorption ability of DSA-TPDH-DA was much better than DSA-AAD-DA. Moreover, adsorption efficiency can still maintain more than 80% after five times adsorption-desorption recycle. Therefore, DSA-AAD-DA and DSA-TPDH-DA possessed great potential for wastewater treatment.

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