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Article Abstract
Hexavalent chromium (Cr(VI)) as one of the most highly toxic heavy metal ion in the water environment, thus its detection and treatment play a cardinal role in environmental assessment and treatment. In this study, ZnO quantum dots (ZnO-QDs) were successfully synthesized via the sol-gel method, with a narrow size distribution between 2 and 9 nm (average size of approximately 4.96 nm). The ZnO-QDs showed high sensitivity and selectivity for Cr(VI) detection with a low detection limit of 1.69 μM in water realized by dynamic fluorescence burst effect of the ZnO-QDs. Meanwhile, the as-prepared ZnO-QDs were composited with InO nanofibers for the photocatalytic reduction of Cr(VI).The results showed that the built-in electric field of the Z-scheme heterojunction formed between ZnO and InO drives the transfer of photogenerated electrons to the interface, achieving an outstanding Cr(VI) reduction efficiency of 92 %. Density Functional Theory (DFT) calculations revealed that the Cr preferentially adsorb on the InO surface for subsequent reduction reactions.This study provides an advanced technical investigation for treating and detecting the Cr(VI)-containing wastewater.
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