1：Experimental Design and Method Selection:

The experiment involved an acid-assisted one-pot synthesis process to fabricate carbon doped WO3-x ultrathin nanosheets, with optimization of reaction conditions such as sulfuric acid and water amounts. Photocatalytic activity was tested for amine oxidation under visible light.

2：Sample Selection and Data Sources:

Samples were synthesized using Na2WO4·2H2O, Span 60, sulfuric acid, and deionized water. Data were acquired through XRD, TEM, HRTEM, UV-vis-NIR spectroscopy, Raman spectroscopy, and elemental analysis.

3：List of Experimental Equipment and Materials:

Equipment included Bruker D8 XRD, JEOL JEM-2010 TEM/HRTEM, Shimadzu SolidSpec-3700 spectrophotometer, PerkinElmer Raman Station 400 spectrometer, Agilent Varian Cary 60 spectrophotometer. Materials included Na2WO4·2H2O, Span 60, sulfuric acid, deionized water, amines, CH3CN, LED lamp, DPD, POD, PBS buffer, ethyl acetate.

4：Experimental Procedures and Operational Workflow:

Synthesis: Dissolve Na2WO4·2H2O and Span 60 in water, add sulfuric acid dropwise, heat at 160°C for 5 hours, wash with water and ethanol. Photocatalysis: Mix catalyst, amine, CH3CN in quartz Schlenk tube under O2 balloon, irradiate with LED lamp (λ > 400 nm,

5：5 W cm-2). H2O2 detection:

Use DPD/POD method with spectrophotometry.

6：Data Analysis Methods:

Data were analyzed using characterization techniques (XRD, TEM, Raman, UV-vis) and statistical comparison of photocatalytic performance under different conditions.