Recent advances in antimony removal using carbon-based nanomaterials: A review

Abstract

• The synthesis and physicochemical properties of various CNMs are reviewed.

• Sb removal using carbon-based nano-adsorbents and membranes are summarized.

• Details on adsorption behavior and mechanisms of Sb uptake by CNMs are discussed.

• Challenges and future prospects for rational design of advanced CNMs are provided.

Recently, special attention has been deserved to environmental risks of antimony (Sb) element that is of highly physiologic toxicity to human. Conventional coagulation and ion exchange methods for Sb removal are faced with challenges of low efficiency, high cost and secondary pollution. Adsorption based on carbon nanomaterials (CNMs; e.g., carbon nanotubes, graphene, graphene oxide, reduced graphene oxide and their derivatives) may provide effective alternative because the CNMs have high surface area, rich surface chemistry and high stability. In particular, good conductivity makes it possible to create linkage between adsorption and electrochemistry, thereby the synergistic interaction will be expected for enhanced Sb removal. This review article summarizes the state of art on Sb removal using CNMs with the form of nano-adsorbents and/or filtration membranes. In details, procedures of synthesis and functionalization of different forms of CNMs were reviewed. Next, adsorption behavior and the underlying mechanisms toward Sb removal using various CNMs were presented as resulting from a retrospective analysis of literatures. Last, we prospect the needs for mass production and regeneration of CNMs adsorbents using more affordable precursors and objective assessment of environmental impacts in future studies.

Graphical abstract

Keywords

Antimony / Carbon nanomaterials / Adsorption / Membrane separation

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