Preparation and Piezo-photocatalytic Properties of BaTiO₃/g-C₃N₄ Composites

Tetragonal phase BaTiO₃ was prepared by using hydrothermal calcination, with Ba(OH)₂·8H₂O and TiO₂. g-C₃N₄ was prepared by using thermal condensation method with melamine as precursor. BaTiO₃/g-C₃N₄ piezo-photocatalytic composites with different mass fractions were prepared by simple lapping. Structure, morphology and optical properties of the samples were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-vis specoscopy. Properties of the composites were studied by simulating the effect of sunlight and ultrasonic wave on degradation of Rhodamine (RhB). It is found that 10% BaTiO₃/g-C₃N₄ has the best visible light absorption performance, whereas the degradation rate of RhB is 97.81% within 100 min, which is 1.48 times that of g-C₃N₄. The trapping agent experiment showed that ·OH and ·O₂⁻ were the main active species under the conditions of piezo-photocatalysis.