Withered Magnolia-Derived Bcds Onto 3d Flower-Like Bi2wo6 for Efficient Photocatalytic Tc Degradation and Co2 Reduction

Abstract

Environmental pollution has become more and more serious, in order to realize the rational utilization of wastewater treatment, the efficient and conductive 3D hierarchical flowers globose nanostructure of biomass-derived carbon quantum dots (BCDs, explored from the withered magnolia blossom) modified Bi2WO6 (Bi2WO6/BCDs) was used to remove 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. As a consequence, the Bi2WO6/BCDs shows a better tetracycline (TC) degradation efficiency on than that of Bi2WO6 (49%) under the Visible light, when mass of BCDs is 15 μL. Additionally, photo-electrochemical measurements further proved that the separation efficiency of electron-holes of Bi2WO6 is enhanced, due to BCDs’s good electron transmission ability and light absorption. The mechanism experiment showed that ·O2- is the main activity specie. Meanwhile, the Bi2WO6/BCDs also showed higher CO2 photoreduction performance to CO (18.2 μmol/g) under UV-vis light. The photogenerated electron transfer and CO2 reduction mechanism also investigated by in-situ FTIR. The favorable photocatalytic performances make the waste biomass carbon act as a new resource of applied to wastewater treatment carbon recycling.

Keywords: Photocatalytic degradation, CO2 photoreduction, Conductive composite photocatalyst, Biomass-derived carbon quantum dots