Janus photoelectrocatalytic filter for sustainable water decontamination

Herein, we conceive a Janus photoelectrocatalytic filter (Sb-Fe/MXene) by depositing Sb single-atoms (Sb-SA) and Fe nanoclusters (Fe-NC) decorated MXene mixture on either side of Ni-foam substrate, respectively, which realized sustainable and efficient generation of hydrogen peroxide (H2O2) and hydroxy radical ((OH)-O-center dot) without any chemicals input. Photocatalytic-side ensures that the accumulated holes at Ti vacancies neighboring the Sb-SA promote the 4e(-) water oxidation reactions to produce O-2, while the Sb-SA sites collect electrons forming reducing centers for non-sacrificial H2O2 production via the 2e oxygen reduction reaction. Electrocatalytic-side guarantees the circulation of = Fe(III)/= Fe(II) by continuously exposing "fresh" reactive sites by dissociating H2O2 on the Fe(II). This further prohibits iron sludge accumulation with an enhanced remedy of micropollutants, even under neutral conditions for wastewater. The collaborative effect between photochemistry and electrochemistry establishes a strategy for energy conversion and environmental remediation using a Janus photoelectrocatalytic filtration system.