Abstract
The biomass-derived carbon quantum dots (BCDs, explored from the withered magnolia blossom) modified Bi2WO6 (Bi2WO6/BCDs) was prepared and used to remove the water contaminants. The biomass-derived carbon quantum dots-modified Bi2WO6 was synthesized by the unique hydrothermal technology and dialyzed method, showing excellent photocatalytic degradation activity of tetracycline and CO2 photoreduction performance. The Bi2WO6/BCDs showed a better tetracycline (TC) degradation efficiency than that of Bi2WO6 (49 %) under the visible light, when mass of BCDs was 15 μL. Additionally, photo-electrochemical measurements proved the separation efficiency of electron-holes of Bi2WO6 was enhanced, due to the great electron transmission ability and light absorption of BCDs. The mechanism experiment showed that ·O2- was the main activity specie in the TC photodegradation process. Meanwhile, the Bi2WO6/BCDs also showed higher CO2 photoreduction performance to CO (18.2 μmol/g) under UV–vis light than the pure Bi2WO6. The CO2 reduction mechanism also investigated by in-situ FTIR. The favorable photocatalytic performances make the waste biomass carbon act as a new resource of application to wastewater treatment and carbon recycling process.
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