Abstract
Efficient heterojunction photocatalysts with spatial separation of photogenerated carriers are crucial to photocatalysis. Herein, the unique carbonized polymer dots/ZnIn2S4 (CPDs/ZIS) Z-scheme heterojunction is designed to realize efficient spatial directional separation of photogenerated carriers. The CPDs broaden the light absorption range of ZIS and lengthen the lifetime of photogenerated charges. As the enrichment center of photogenerated electrons and active site of activated oxygen, CPDs generate more superoxide radicals to facilitate mineralization of organic pollutants by means of confined catalysis. The Z-scheme migration mechanism of photogenerated carriers in the CPDs/ZIS composite preserves the original valence band potential of ZIS and retains more holes for oxidation. Compared to the pristine ZIS, the CPDs/ZIS composite delivers enhanced photocatalytic performance in pollutant degradation. Electron spin resonance spectroscopy, free radical capture experiments, and liquid chromatography/mass spectrometry are performed to elucidate the photocatalytic mechanism of CPDs/ZIS.
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