Preparation of High-Porosity B-TiO 2 /C 3 N 4 Composite Materials: Adsorption–Degradation Capacity and Photo-Regeneration Properties

Adsorption can quickly remove pollutants in water, while photocatalysis can effectively decompose organic matter. B-TiO 2 /g-C 3 N 4 ternary composite photocatalytic materials were prepared by molten method, and their adsorption–degradation capability under visible light conditions was discussed. The morphology of the B-TiO 2 /g-C 3 N 4 materials was inspected by SEM, TEM, BET, and EDS, and the results showed that close interfacial connections between TiO 2 and g-C 3 N 4 , which are favorable for charge transfer between these two semiconductors, formed heterojunctions with suitable band structure which was contributed by the molten B 2 O 3 . Meanwhile, the molten B 2 O 3 effectively increased the specific surface area of TiO 2 /C 3 N 4 materials, thereby increasing the active sites and reducing the recombination of photogenerated electron–hole pairs and improving the photocatalytic degradation abilities of TiO 2 and g-C 3 N 4 . Elsewhere, the crystal structure analysis (XRD, XPS, FTIR) results indicated that the polar -B=O bond formed a new structure with TiO 2 and g-C 3 N 4 , which is not only beneficial for inhibiting the recombination of electron holes but also improving the photocatalytic activity. By removal experiment, the adsorption and degradation performances of B-TiO 2 /g-C 3 N 4 composite material were found to be 8.5 times and 3.4 times higher than that of g-C 3 N 4 . Above all, this study prepared a material for removing water pollutants with high efficiency and provides theoretical support and experimental basis for the research on the synergistic removal of pollutants by adsorption and photocatalysis.