Graphene Oxide-Doped CNT Membrane for Dye Adsorption

Area of Science:

• Materials Science
• Environmental Science
• Nanotechnology

Background:

• Graphene oxide (GO) is a promising dye adsorbent, but its powder form hinders recovery and reuse.
• Developing practical applications for GO requires addressing its physical limitations for efficient water treatment.

Purpose of the Study:

• To design and synthesize graphene oxide-modified carbon nanotubes buckypapers (GO-BPs) for improved dye adsorption.
• To enhance the regeneration and reuse capabilities of graphene oxide-based adsorbents.
• To investigate the adsorption performance of GO-BPs for various synthetic dyes.

Main Methods:

• Fabrication of GO-modified carbon nanotubes buckypapers (GO-BPs).
• Dye adsorption experiments using Acid Blue 29, Crystal Violet, Eosyn Y, Malachite Green, and Rhodamine B.
• Analysis of adsorption isotherms and kinetic studies to determine adsorption mechanisms and thermodynamic favorability.

Main Results:

• GO-BPs demonstrated high adsorption capacities for cationic dyes: Malachite Green (493.44 mg g⁻¹), Rhodamine B (467.35 mg g⁻¹), and Crystal Violet (374.53 mg g⁻¹).
• Adsorption efficiency correlated with the surface charge compatibility between GO-BPs and dye molecules.
• Dye adsorption onto GO-BPs was thermodynamically favorable and followed a pseudo-first-order kinetic model.

Conclusions:

• GO-BPs effectively overcome the recovery and reuse challenges associated with traditional graphene oxide powder.
• The developed GO-BP material shows significant potential as a reusable adsorbent for removing cationic dyes from wastewater.
• Optimized GO-BP structures offer superior adsorption performance, particularly for dyes exhibiting cationic forms.