1：Experimental Design and Method Selection:

A facile solvothermal process was used to prepare BiVO4/Bi4V2O10 porous heterophase nanospheres. The crystal structure was regulated by changing the solvothermal reaction time.

2：Sample Selection and Data Sources:

Bismuth nitrate pentahydrate and sodium metavanadate were used as precursors. The samples were characterized by XRD, SEM, TEM, HRTEM, UV-vis DRS, FT-IR, Raman spectroscopy, XPS, N2 adsorption/desorption, PL, and photoelectrochemical measurements.

3：List of Experimental Equipment and Materials:

SmartLab 9 KW XRD, Hitachi/S-4800 SEM, JEOL/2100 TEM, Shimadzu/UV-2550 UV-vis spectrophotometer, Perkin Elemer FT-IR, Horiba Jobin Yvon HR 800 micro-Raman spectrometer, Shimadzu/Kratos-AXIS ULTRA DLD XPS, TRISTAR II3020 surface and pore analyzer, Edinburgh/FL920 fluorescence spectrometer, Multi N/C 2100S TOC analyzer, BAS100B electrochemical analyzer, CEL-HXF-300 xenon lamp.

4：Experimental Procedures and Operational Workflow:

The BiVO4/Bi4V2O10 nanospheres were synthesized via a solvothermal method. The photocatalytic activity was evaluated by degrading RhB, MB, and phenol under visible light irradiation.

5：Data Analysis Methods:

The photocatalytic degradation kinetics were analyzed using pseudo-first-order kinetics. The separation and transfer of photoinduced carriers were investigated by PL and photoelectrochemical measurements.