Microplastic contaminant adsorption by graphene oxide layer.

Area of Science:

• Environmental Science
• Materials Science
• Chemistry

Background:

• Microplastic contamination, including Bisphenol A (BPA) and polyethylene terephthalate (PET), presents significant risks to human health and ecosystems.
• These contaminants are linked to endocrine disruption and other adverse health effects, necessitating effective removal strategies.

Purpose of the Study:

• To investigate graphene oxide (GO) as a potential adsorbent for removing BPA and PET microplastics from water.
• To analyze the molecular interactions governing the adsorption process and quantify GO's efficiency.

Main Methods:

• Utilized computational simulations to analyze molecular interactions between GO and microplastic contaminants.
• Quantitatively assessed adsorption efficiencies and binding affinities (∆G) for BPA and PET on GO.

Main Results:

• Graphene oxide demonstrated strong binding affinities: ∆G = -9.50 kcal/mol for BPA and ∆G = -6.90 kcal/mol for PET.
• Adsorption is primarily driven by π-π stacking interactions, supplemented by hydrogen bonding and van der Waals forces.
• Computational simulations confirmed consistent binding across GO active sites, indicating reliable performance.

Conclusions:

• Graphene oxide shows significant potential as an efficient adsorbent for removing BPA and PET microplastics.
• GO-based filtration systems offer a promising solution for large-scale water treatment and mitigating microplastic pollution.
• Further research is recommended to optimize GO filtration techniques and assess long-term environmental impacts.