3D hierarchical graphene oxide-NiFe LDH composite with enhanced adsorption affinity to Congo red, methyl orange and Cr(VI) ions

Yingqiu ZHENG, Bei CHENG, Wei YOU, Jiaguo YU, Wing Kei HO

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Three-dimensional (3D) hierarchical graphene oxide-NiFe layered double hydroxide (GO-NiFe LDH) composite with sandwich-like structure is fabricated using a facile one-pot hydrothermal reaction. Electron microscopy images demonstrate that the GO-NiFe LDH composite possesses a highly porous and well-ordered structure. Both sides of the GO are fully covered by the LDH nanosheets, resulting in the sandwich-like architecture. The adsorption performance of the GO-NiFe LDH composite and pure NiFe LDH for three anionic pollutants, namely, Congo red (CR), methyl orange (MO) and hexavalent chromium ion [Cr(VI)] is systematically investigated. The presence of GO in the GO-NiFe LDH composite leads to the better adsorption capability and faster adsorption kinetics of this composite compared with the NiFe LDH microspheres. The pseudo-second-order kinetic model can well represent the adsorption kinetics, and the Langmuir isotherm model provides a better description for the adsorption isotherms. The GO-NiFe LDH composite demonstrates appreciable potential in alleviating anionic pollutants from the aquatic environment as shown by its excellent adsorption capability towards CR, MO and Cr(VI). Copyright © 2019 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)214-225
JournalJournal of Hazardous Materials
Volume369
Early online dateFeb 2019
DOIs
Publication statusPublished - May 2019

Fingerprint

Congo Red
Graphite
Oxides
Graphene
Adsorption
hydroxide
oxide
Ions
adsorption
ion
Composite materials
kinetics
Kinetics
isotherm
pollutant
Nanosheets
electron microscopy
Microspheres
Adsorption isotherms
aquatic environment

Bibliographical note

Zheng, Y., Cheng, B., You, W., Yu, J., & Ho, W. (2019). 3D hierarchical graphene oxide-NiFe LDH composite with enhanced adsorption affinity to Congo red, methyl orange and Cr(VI) ions. Journal of Hazardous Materials, 369, 214-225. doi: 10.1016/j.jhazmat.2019.02.013

Keywords

  • Hierarchical
  • GO
  • LDH nanosheet
  • Anionic pollutant
  • Adsorption