The interfacial ZnFe₂O₄ is formed during the slow deposition of Fe³⁺ at the surface of ZnO.

The electrochemical analysis revealed the p-type nature of surface ZnFe₂O₄ and Fe₂O₃.

The interfacial ZnFe₂O₄ not only facilitate the separation but also act as an individual photocatalyst.

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