Abstract
In work, (002) oriented flower-like Bi2O2CO3(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 Bi2O2CO3 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. CO2 was verified to be the primary product. The oriented flower-like Bi2O2CO3 with carbon quantum dots on the surface shows great potential in the field of solar driven air purification.
Highlights
Volatile organic compounds (VOCs) are one of the major gas pollutants in indoor air, including various alcohols, aromatics, aldehydes and halocarbons, which put humans health at great risks [1,2,3]
Photocatalysis may be a promising technique for indoor air purification, because harmless CO2 and H2O are the main products of pollutant degradation [7]
This work may probably extend to the application of oriented flower-like Bi2O2CO3 with carbon quantum dots on the surface in air purification
Summary
Volatile organic compounds (VOCs) are one of the major gas pollutants in indoor air, including various alcohols, aromatics (benzene, ethylbenzene, toluene, xylene, etc.), aldehydes (acetaldehyde, formaldehyde, etc.) and halocarbons, which put humans health at great risks [1,2,3]. Due to its particular layer structure, suitable band gap, excellent photocatalytic activity and long-term stability, Bi2O2CO3 has drawn considerable attention for its promising application in the photocatalysis field [20]. Bi2O2CO3 has a wide band gap (2.8–3.5) eV [21] and it can only response ultraviolet light of the solar light, which greatly restricts its practical application under full solar light To solve this problem, several strategies have been investigated, mainly focusing on doping elements [22,23,24], Crystal facet engineering [18,25,26] and Constructing heterostructures [27,28,29]. The morphologies of synthesized composites (CQD/BOC) were flower-like shapes, irregular flaky structures and fine spherical particles Their photocatalytic properties for removal toluene in air under the artificial irradiation are investigated comparatively. This work may probably extend to the application of oriented flower-like Bi2O2CO3 with carbon quantum dots on the surface in air purification
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