Efficient electroadsorptive capture of perfluorooctanoic acid using a regenerable Ti(3)C(2)T(x) MXene electrode modified with flower-like CuO nanorod assemblies.

MCO-20, a Ti3C2Tx MXene/CuO composite electrode, removed 96.12% of PFOA from water at 0.8 V in 5 mM Na2SO4, outperforming other MXene loadings.

• Why it matters: PFOA is persistent and hard to remove with conventional water-treatment, so efficient capture and regeneration under realistic water chemistry are needed.
• What they did: Electrostatic self-assembly produced Ti3C2Tx/CuO electrodes with varying MXene loadings; structural and electrochemical tests identified MCO-20, then adsorption kinetics and models were fit.
• The result: Under selected conditions, pseudo-second-order kinetics and Langmuir adsorption gave a 57.51 mg g−1 maximum capacity, and regeneration retained 89.40% after six cycles.

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