Preparation of polyethyleneimine-modified chitosan/Ce-UIO-66 composite hydrogel for the adsorption of methyl orange

Zhi Chen; Zhi-Bo Zhang; Jun Zeng; Zhi-Jie Zhang; Shan Ma; Cong-Ming Tang; Jun-Qiang Xu

doi:10.1016/j.carbpol.2022.120079

Preparation of polyethyleneimine-modified chitosan/Ce-UIO-66 composite hydrogel for the adsorption of methyl orange

Carbohydr Polym. 2023 Jan 1:299:120079. doi: 10.1016/j.carbpol.2022.120079. Epub 2022 Sep 7.

Authors

Zhi Chen¹, Zhi-Bo Zhang², Jun Zeng², Zhi-Jie Zhang², Shan Ma², Cong-Ming Tang², Jun-Qiang Xu²

Affiliations

¹ College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, PR China. Electronic address: z.chen@cqut.edu.cn.
² College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, PR China.

PMID: 36876761
DOI: 10.1016/j.carbpol.2022.120079

Abstract

In this work, a polyethyleneimine-modified chitosan/Ce-UIO-66 composite hydrogel (PEI-CS/Ce-UIO-66) was prepared using the ex-situ blend method. The synthesized composite hydrogel was characterized by SEM, EDS, XRD, FTIR, BET, XPS, and TG techniques, while the zeta potential was recorded for sample analysis. The adsorbent performance was studied by conducting adsorption experiments using methyl orange (MO), which showed that PEI-CS/Ce-UIO-66 exhibited excellent MO adsorption properties (900.5 ± 19.09 mg/g). The adsorption kinetics of PEI-CS/Ce-UIO-66 could be explained by the pseudo-second-order kinetic model, and its isothermal adsorption followed the Langmuir model. Thermodynamics showed that the adsorption was spontaneous and exothermic at low temperatures. MO could interact with PEI-CS/Ce-UIO-66 via electrostatic interaction, π-π stacking, and hydrogen bonding. The results indicated that the PEI-CS/Ce-UIO-66 composite hydrogel could potentially be used for the adsorption of anionic dyes.

Keywords: Adsorption; Ce-UIO-66; Chitosan; Composite hydrogel; Methyl orange; Polyethyleneimine.