1：Experimental Design and Method Selection:

The study involved in-situ hydrothermal synthesis of CQDs/TiO2 particles, followed by fabrication of 3D GO foam doped with CQDs/TiO2 using ultrasound mixing and multiple impregnation methods on polyurethane foam (PUF). Theoretical models include photocatalysis mechanisms for dye degradation.

2：Sample Selection and Data Sources:

Samples included CQDs/TiO2 particles synthesized with different reaction times (10, 12, 14 hours), and dyes such as methylene blue (MB) and rhodamine B for degradation tests. Data were sourced from UV-vis spectroscopy and other characterization techniques.

3：List of Experimental Equipment and Materials:

Equipment included SEM (JSM-6700F, JEOL), TEM (JEM-2100, JEOL), AFM (Bruker MultiMode 8), XRD (Ultima IV, Japan Science Co., Ltd.), XPS (ESCALAB 250, Thermo Scientific), FT-IR (Nicolet NEXUS), UV-vis spectrometer, and a 350 W xenon lamp. Materials included natural graphite flake, furfural, titanium tetrabutanol, TiO2 P25, various acids and chemicals, polyurethane foam (PUF from BASF SE), and synthesized GO.

4：Experimental Procedures and Operational Workflow:

Steps included synthesis of CQDs/TiO2 via hydrothermal method, mixing with GO using ultrasound, loading onto PUF by multiple immersion and drying, and testing photocatalytic degradation of dyes under visible light irradiation with sampling every hour for UV-vis analysis.

5：Data Analysis Methods:

Data were analyzed using UV-vis spectroscopy to measure dye concentration degradation, statistical analysis of efficiency, and characterization techniques (SEM, TEM, XRD, etc.) to confirm material properties.