Construction of a Novel Highly Porous Biobr/Csxwo3Sio2 Composite Aerogel : Adsorption/Self-Heating Photocatalytic Synergistic Degradation of Antibiotics and Mechanism Study

In order to obtain highly efficient aerogel-based photocatalytic materials, a novel highly porous BiOBr/CsxWO3@SiO2 composite aerogel with adsorption/self-heating photothermal catalysis synergistic effect was constructed using melamine resin as template by supercritical drying technique. The addition of melamine resin is conducive to uniform dispersion of particles and expanding pore volume of the composite aerogels. Moreover, the composite aerogel with BiOBr/CsxWO3 molar ratio 2:1 exhibited the best self-heating photothermal synergistic catalysis, with the adsorption/self-heating photothermal catalytic degradation rate of tetracycline being close to 100% after 30 min of darkroom adsorption and 60 min of light irradiation. The excellent adsorption/self-heating photothermal catalysis synergistic effect can be ascribed to the high porosity of the aerogel and excellent NIR absorption of CsxWO3 as well as the BiOBr/CsxWO3 heterojunction catalysis effect. Based on the radical trapping experiments and small polariton absorption theory, the efficient adsorption/self-heating photothermal synergistic catalysis mechanism of BiOBr/CsxWO3@SiO2 composite aerogel was proposed