UV-visible diffuse reflection spectrum, PL spectroscopy, FTIR spectrum, Photoelectrochemical testing，XRD images, Thermogravimetric images，SEM and TEM images of the prepared catalyst, structure file of Ru-B-C3N4

X-ray powder diffraction (XRD) is an important technique used to study the crystal structure of materials.In this study, all the samples were analyzed by X-ray diffraction (XRD) using a Bruker D8 ADVANCE diffractometer equipped with Cu Kα radiation (λ = 0.15418 nm) to obtain information on the crystal structure. Solid-state UV-visible diffuse reflectance spectroscopy (UV-vis DRS) measures the light absorption performance and bandgap width of catalysts. In this study, the TU-1901 instrument model was utilized for these measurements. Fourier-transform infrared spectroscopy (FT-IR) was employed to analyze the different characteristic functional groups, molecular structures, and chemical compositions of the samples. The FTIR-650G infrared spectrometer was used in this research. Photoluminescence spectroscopy test (PL) to analyze the complexation process of photogenerated carriers. The instrument model used in this thesis is Fluoro Max4. ElectronScanning Electron Microscopy (SEM) is used to analyze the surface morphology, particle size, and other features of the material. The equipment used in this study was the Ultra Plus. Transmission electron microscopy (TEM) was used to characterize the surface morphology of the samples.In this study, a Thermo Fisher Scientific, Talos F200S microscope was used for imaging and data such as lattice fringes of the samples were analyzed using Gatan Digital Micrograph software. Thermal Gravimetric Analyzer (TGA) is an instrument that detects the temperature-mass change relationship of a substance using the thermogravimetric method. The model of Thermal Gravimetric Analyzer equipment used in this experiment: TGA 4000. Photoelectrochemical testing: Photoelectrochemical testing of the series of samples was carried out on an electrochemical workstation (CHI650E, Shanghai Chenhua Instrument Co., Ltd., China) using a standard three-electrode system. The tests were performed under a 300 W xenon lamp (CEL-HXF300) light source using 0.5 M Na2SO4 as the electrolyte and a conductive glass coated with the sample (FTO) as the working electrode.