1：Experimental Design and Method Selection:

The study involved the synthesis of Ag4V2O7/g-C3N4 heterostructure via a facial etching method in ammonia solution using Ag2VO2PO4/g-C3N4 as a precursor. The concentration of ammonia solution was varied to study the phase transformation.

2：Sample Selection and Data Sources:

Ag2VO2PO4/g-C3N4 was used as the precursor. The etched samples were characterized using various techniques to study their photocatalytic properties.

3：List of Experimental Equipment and Materials:

X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-visible diffuse reflectance absorption spectra (UV-vis DRS), Fourier transform infrared spectra (FTIR), time-resolved photoluminescence (TRPL) spectra, X-ray photoelectron spectroscopy (XPS), total organic carbon (TOC) analyzer, spin-trapping electron spin resonance (ESR) measurement.

4：Experimental Procedures and Operational Workflow:

The photocatalytic activity was evaluated by degrading methylene blue (MB), methyl orange (MO), and imidacloprid under visible light irradiation. The stability and reusability of the photocatalysts were also tested.

5：Data Analysis Methods:

The photocatalytic degradation rates were analyzed using a pseudo-first-order kinetic model. The separation and transfer efficiency of photoinduced charges were studied using TRPL, photocurrent response, and EIS Nyquist plots.