Carbon Quantum Dots Modified (002) Oriented Bi(2)O(2)CO(3) Composites with Enhanced Photocatalytic Removal of Toluene in Air

In work, (002) oriented flower-like Bi(2)O(2)CO(3)(BOC) composites are synthesized by a facile chemical route and carbon quantum dots (CQDs) are modified on their surfaces through a hydrothermal method. The synthesized samples (CQD/BOC) are characterized by X-ray diffraction (XRD), SEM, X-ray photoelectron spectroscopy (XPS), UV-Vis diffuser reflectances (DRS), BET and TEM/HRTEM. The morphologies of CQD/BOC composites are the flower-like shapes, the irregular flaky structures and the fine spherical particles of CQDs attached. Photocatalytic performances were investigated in terms of removing gaseous toluene at a concentration of 94.3ppm in air, with the assistance of CQD/BOC under artificial irradiation. Our results show that CQDs modified (002) oriented Bi(2)O(2)CO(3) exhibits good photocatalytic activity for toluene decomposition, which can be attributed to the enhanced efficient charge separation. A certain ratio composite photocatalyst (BOC-CQD-15) shows a toluene removal rate of 96.62% in three hours, as well as great stability. CO(2) was verified to be the primary product. The oriented flower-like Bi(2)O(2)CO(3) with carbon quantum dots on the surface shows great potential in the field of solar driven air purification.