Preparation of green chelating fibers and adsorption properties for Cd(II) in aqueous solution

Chitosan chains (CTS) were grafted onto polyvinyl alcohol fibers (PVAf) with the aid of coupling agent γ -glycidoxypropyltrimethoxysilane, producing grafted fibers PVAf- g -CTS. Then, chloroacetic acid (CA) was used to react with the chitosan chains on the PVAf- g -CTS surface via nucleophilic subst...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science 2018-02, Vol.53 (3), p.2277-2289
Main Authors: Meng, Jian, Cui, Jianlan, Yu, Jing, Huang, Wei, Wang, Peng, Wang, Kui, Liu, Mingqiao, Song, Changyuan, Chen, Peng
Format: Article
Language:English
Subjects:
Adsorption
Aqueous solutions
Chains
Characterization and Evaluation of Materials
Chelation
Chemistry and Materials Science
Chitosan
Chloroacetic acid
Classical Mechanics
Coupling agents
Crystallography and Scattering Methods
Fibers
Materials Science
Polymer Sciences
Polymers
Polyvinyl alcohol
Reaction kinetics
Solid Mechanics
Substitution reactions
X ray photoelectron spectroscopy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Chitosan chains (CTS) were grafted onto polyvinyl alcohol fibers (PVAf) with the aid of coupling agent γ -glycidoxypropyltrimethoxysilane, producing grafted fibers PVAf- g -CTS. Then, chloroacetic acid (CA) was used to react with the chitosan chains on the PVAf- g -CTS surface via nucleophilic substitution reaction to produce fibrous PVAf- g -CACTS with multiple adsorption sites. The products were characterized by using FTIR, SEM, XRD and XPS, revealing that the reaction followed the S N 2 mechanism. Optimum parameters, including a reaction temperature of 50 °C and a mass ratio of PVAf- g -CTS to CA of 1:0.12, were determined for the reaction. Adsorption experiments confirmed that PVAf- g -CACTS showed greater adsorption characteristics for Cd(II) in aqueous solutions compared with PVAf- g -CTS and PVAf. In particular, the rate of Cd(II) uptake by using PVAf- g -CACTS was higher, and the equilibrium was reached within 80 min. When pH was 7, the saturated adsorption capacity reached 47.65 mg g −1 . The adsorption kinetics conformed to the pseudo-second-order model, and the adsorption process was in accordance with the Langmuir and Temkin isotherm model. Adsorption–desorption cycle experiments showed that PVAf- g -CACTS had good performance of reuse, and the adsorption mechanism was analyzed further by using XPS.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-017-1653-x