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 journalArticles

68 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

Citation

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

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