Environmental application of three-dimensional graphene materials as adsorbents for dyes and heavy metals: Review on ice-templating method and adsorption mechanisms

Kar Chiew Lai, Lai Yee Lee*, Billie Yan Zhang Hiew, Suchithra Thangalazhy-Gopakumar, Suyin Gan

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

98 Citations (SciVal)

Abstract

The remediation of wastewater requires treatment technologies which are robust, efficient, simple to operate and affordable such as adsorption. Lately, three-dimensional (3D) graphene based materials have attracted significant attention as effective adsorbents for wastewater treatment. The intrinsic properties of 3D graphene structure such as large surface area and interconnected porous structure can facilitate the transport of pollutants into the 3D network and provide abundant active sites for trapping the pollutants. For the synthesis of 3D graphene structure, ice-templating is commonly practiced due to its facile steps, cost effectiveness and high scalability potential. This review covers the ice-templating fabrication technique for 3D graphene based materials and their application as adsorbents in eliminating dyes and heavy metals from aqueous media. The assembly mechanisms of the ice-templating fsynthesis are comprehensively discussed. Further discussion on the fundamental principles, critical process parameters and characteristics of ice-templated 3D graphene structures is also included. A thorough review on the mechanisms for batch adsorption of dyes and heavy metals is presented based on the structures and properties of the 3D graphene materials. The review further evaluates the dynamic adsorption in packed columns and the regeneration of 3D graphene based materials.

Original languageEnglish
Pages (from-to)174-199
Number of pages26
JournalJournal of Environmental Sciences
Volume79
Early online date14 Dec 2018
DOIs
Publication statusPublished - May 2019

Keywords

  • 3D graphene based structure
  • Adsorption mechanism
  • Dyes
  • Heavy metals
  • Ice-templating

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Environmental Science(all)

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