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

Zhihui Lei; Wenhua Gao; Jinsong Zeng; Bin Wang; Jun Xu

doi:10.1016/j.carbpol.2019.115631

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

Carbohydr Polym. 2020 Feb 15:230:115631. doi: 10.1016/j.carbpol.2019.115631. Epub 2019 Nov 17.

Authors

Zhihui Lei¹, Wenhua Gao², Jinsong Zeng¹, Bin Wang¹, Jun Xu¹

Affiliations

¹ State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China.
² State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China. Electronic address: segaowenhua@scut.edu.cn.

PMID: 31887916
DOI: 10.1016/j.carbpol.2019.115631

Abstract

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.

Keywords: 2,3-Dialdehyde nano-fibrillated celluloses; Adsorption; Cu (II); Periodate oxidation.