Atomic Structure Control of Graphene Oxide by Cascading Oxidation and Its Efficient Binding to Aromatic Compounds

Why It Matters

LoxGO’s enhanced adsorption dramatically improves water‑treatment efficacy while cutting chemical inputs, advancing sustainable pollutant remediation.

Key Takeaways

• Cascading oxidation yields LoxGO with 41.8% graphitic regions.
• Oxidant-to-graphite ratio reduced to 0.5, reaction-controlled.
• Graphitic domains expand to ~8.3 nm², minimal holes.
• Aromatic pollutant removal efficiency increases up to 2.1×.
• π–π interactions drive superior adsorption of endocrine disruptors.

Pulse Analysis

Graphene oxide has long been prized for its versatility, yet its performance hinges on the balance between graphitic and oxidized regions. Conventional synthesis methods rely on diffusion‑controlled reactions that flood the carbon lattice with oxygen, creating abundant defects and limiting the size of pristine graphitic domains. This structural ambiguity hampers predictability in applications ranging from electronics to separations, prompting researchers to seek a more deterministic approach to GO engineering.

The cascading oxidation process redefines GO fabrication by shifting to reaction‑controlled kinetics and dramatically lowering the oxidant load (R = 0.5). By introducing oxidation steps sequentially, the method preserves large graphitic islands—averaging 8.3 nm²—while confining oxygen functionalities to well‑defined peripheral zones. Quantitatively, LoxGO exhibits 41.8% graphitic versus 58.2% oxidized regions and fewer than 0.1% hole defects, a stark contrast to typical GO where graphitic domains are an order of magnitude smaller. These atomic‑scale refinements create abundant π‑π stacking sites, directly enhancing affinity for planar aromatic molecules.

From an environmental standpoint, LoxGO’s structural precision translates into tangible gains in contaminant capture. The material achieves up to 2.1‑times higher removal rates for emerging aromatic pollutants, including hormone‑disrupting compounds and antibiotic residues, without requiring higher dosages or additional reagents. This efficiency not only lowers operational costs for water‑treatment facilities but also aligns with circular‑economy principles by reducing waste generation. As regulatory pressure mounts on emerging contaminants, LoxGO offers a scalable, low‑impact solution that could reshape adsorption‑based remediation strategies worldwide.