Magnetic graphene-carbon nanotube iron nanocomposites as adsorbents and antibacterial agents for water purification

作者:Sharma, Virender K.; McDonald, Thomas J.; Kim, Hyunook; Garg, Vijayendra K. 刊名:Advances in Colloid and Interface Science 上传者:郭冰玉

【摘要】

Highlights

Magnetic three-dimensional (3D) graphene-based nanostructures as smart adsorbents

3D-nanostructures have larger adsorption capacity than conventional adsorbents.

Efficient removal of metals and organics to purify water

Enhanced antibacterial activity against a wide range of bacterial species

Abstract

One of the biggest challenges of the 21st century is to provide clean and affordable water through protecting source and purifying polluted waters. This review presents advances made in the synthesis of carbon- and iron-based nanomaterials, graphene–carbon nanotubes–iron oxides, which can remove pollutants and inactivate virus and bacteria efficiently in water. The three-dimensional graphene and graphene oxide based nanostructures exhibit large surface area and sorption sites that provide higher adsorption capacity to remove pollutants than two-dimensional graphene-based adsorbents and other conventional adsorbents. Examples are presented to demonstrate removal of metals (e.g., Cu, Pb, Cr(VI), and As) and organics (e.g., dyes and oil) by grapheme-based nanostructures. Inactivation of Gram-positive and Gram-negative bacterial species (e.g., Escherichia coli and Staphylococcus aureus) is also shown. A mechanism involving the interaction of adsorbents and pollutants is briefly discussed. Magnetic graphene-based nanomaterials can easily be separated from the treated water using an external magnet; however, there are challenges in implementing the graphene-based nanotechnology in treating real water.

Graphical abstract

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