Abstract
A novel 3D Stack Z-scheme photoelectrocatalytic (PEC) system was set up with Ag-TiO2/Ti nanotubes (Ag-TNTs) photoanode and g-C3N4/Cu2O/Cu nanowires (CN-CNWs) photocathode to realize efficient quinoline removal. Multiple mesh photoelectrodes were arranged in an alternating form (anode-cathode-anode) in the reactor to make full use of light and increase the contact possibility between catalysts and contaminants. Results suggested that the PEC system, CN-CNWs photocathode and O2 condition could enhance the quinoline removal. Radical quenching experiment confirmed that hydroxyl radical (·OH) was dominant reactive oxygen species (ROS) in the PEC system and superoxide radical (·O2-) generated on cathode was the reason for the increased quinoline removal efficiency with O2. Compared with Cu2O/Cu, the CN-CNWs photocathode generated more H2O2 under different conditions. The mechanism was proposed: Driven by the bias, the anode electrons and cathode holes recombined and realized the simultaneous oxidation and reduction as a Z-scheme. It enhanced the reactions on both photoelectrodes and improved the system efficiency. This study provided a new and promising insight into the development of a novel PEC system for environmental remediation.
Published Version
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