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Band diagram for the mechanism of charge transfer involved in the photo-electrocatalytic degradation activity of Pd-ZnO-expanded graphite (EG) photoanode on 4-nitrophenol removal.

EG–TiO2 photoanode was applied for the photoelectrocatalytic degradation of sulfamethoxazole. Significant COD abatement was obtained and degradation route was proposed.

Degradation of dye monitored by visible spectrophotometry. Inset a: photocurrent response of the photoanode; inset b: proposed photoelectrochemical mechanism.