The mechanism of Cu (II) adsorption onto 2,3-dialdehyde nano-fibrillated celluloses

• Published in: Carbohydrate polymers Vol. 230; p. 115631
• Main Authors: Lei, Zhihui, Gao, Wenhua, Zeng, Jinsong, Wang, Bin, Xu, Jun
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 15.02.2020
• Subjects: 2,3-Dialdehyde nano-fibrillated celluloses; Adsorption; Cu (II); Periodate oxidation; 2,3-Dialdehyde nano-fibrillated celluloses; Cu (II); Periodate oxidation; Adsorption
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2019.115631

[Display omitted] •DNFCs were prepared by periodate oxidation from bleached softwood kraft pulp.•The adsorption kinetics, isotherms and thermodynamics of DNFCs were investigated.•The oxidation process affected the Cu (II) absorption ability of DNFCs.•Pseudo-second-order and Freundlich described the Cu (II) adsorption process of DNFCs. Nano-fibrillated celluloses (NFCs) were separated from bleached softwood kraft pulp. Through the periodate oxidation method, 2,3-dialdehyde nano-fibrillated celluloses (DNFCs) with varied aldehyde content were prepared. The high aldehyde content, large specific surface area and high surface charge density of DNFCs benefited the adsorbing of Cu (II). The adsorption kinetics and isotherms presented good correlations with the Pseudo-second-order model and Freundlich model, respectively. Both physical and chemical adsorptions existed in the Cu (II) adsorption by DNFCs, while chemisorption was the rate-limiting step. The adsorption thermodynamic parameters Gibbs free energy change (ΔG), enthalpy change (ΔH) and entropy change (ΔS) were also investigated. This study provides theoretical support for applying DNFCs to remove metal ions from aqueous solutions.