Schiff base functionalized dialdehyde starch for enhanced removal of Cu (II): Preparation, performances, DFT calculations.

Autor: Liang L; School of Chemical Engineering, GuizhouMinzuUniversity, Guiyang 550025, PR China., Han M; School of Chemical Engineering, GuizhouMinzuUniversity, Guiyang 550025, PR China., Liu YQ; School of Chemical Engineering, GuizhouMinzuUniversity, Guiyang 550025, PR China., Huang C; School of Chemical Engineering, GuizhouMinzuUniversity, Guiyang 550025, PR China., Leng YL; School of Chemical Engineering, GuizhouMinzuUniversity, Guiyang 550025, PR China., Zhang YP; School of Chemical Engineering, GuizhouMinzuUniversity, Guiyang 550025, PR China., Cai XH; School of Chemical Engineering, GuizhouMinzuUniversity, Guiyang 550025, PR China. Electronic address: caixh1111@163.com.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2024 May; Vol. 268 (Pt 1), pp. 131424. Date of Electronic Publication: 2024 Apr 12.
DOI: 10.1016/j.ijbiomac.2024.131424
Abstrakt: Dialdehyde starch modified by 2-hydrazinopyridine (HYD-DAS) based on the reaction of dialdehyde starch (DAS) and 2-hydrazinopyridine was synthesized and characterized by FT-IR spectra, element analysis and SEM. HYD-DAS can efficiently adsorb Cu (II) ion to demonstrate visual color changes from yellow to dark brown in aqueous solutions. The influence on HYD-DAS to Cu (II) adsorption including pH value of solution, isotherm, kinetics, thermodynamics and possible mechanism had also been examined. Batch experiments indicate that HYD-DAS's to Cu (II) adsorption reaches equilibrium within 250 min, and its adsorption capacity and rate are 195.75 mg/g and 98.63 %, respectively. Moreover, HYD-DAS to Cu (II) adsorption remains robust and underscoring after five cycles to exhibit good selectivity and reusability. Kinetics studies suggest the absorption process follows a quasi-second-order with isotherms aligning to the Langmuir monolayer model, and thermodynamics reveals that it is a spontaneous endothermic nature of adsorption. Based on the analyses of XPS and DFT calculations, a possible mechanism for HYD-DAS to Cu (II) adsorption is that Cu (II) combined with nitrogen atoms from Schiff base and hydrazine pyridine ring in HYD-DAS.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier B.V.)
Databáze: MEDLINE
Externí odkaz: