1：Experimental Design and Method Selection:

The study prepared a heterogeneous composite catalyst Cu2O/(001)TiO2 using the impregnation-reduction method to enhance photocatalytic degradation of ammonia under sunlight. The design rationale was to combine the high activity of (001) facets of TiO2 with the visible light response of Cu2O to improve solar energy utilization. Theoretical models included energy band diagrams and the Kubelka-Munk method for band gap calculation.

2：Sample Selection and Data Sources:

Catalysts prepared included Cu2O, (001)TiO2, Cu2O/(001)TiO2, and commercial P25. Ammonia gas at 120 ± 3 ppm concentration was used as the pollutant source. Data were acquired through various characterization techniques and photocatalytic tests.

3：Ammonia gas at 120 ± 3 ppm concentration was used as the pollutant source. Data were acquired through various characterization techniques and photocatalytic tests. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Materials: Butyl titanate, anhydrous glucose, sodium hydroxide, anhydrous ethanol, hydrofluoric acid, anhydrous copper sulfate, P25 (Degussa), polyester fiber carrier. Equipment: X-ray diffractometer (XRD, D8 Advance, Bruker), UV-Vis spectrophotometer (U-3010, Hitachi), high-resolution transmission electron microscope (HRTEM, Tecnai G2 F20, FEI), Raman spectrometer (LabRAM XploRA INV, Horiba), field-emission scanning electron microscope (FE-SEM, Inspect F50, Thermo Fisher Scientific), X-ray photoelectron spectrometer (XPS, EscaLab 250Xi, Thermo Fisher Scientific), photoluminescence emission spectrometer (PL, F-2700, Hitachi), small air pump, 300 W xenon lamp, INNOVA continuous detector for ammonia concentration.

4：Experimental Procedures and Operational Workflow:

Preparation of (001)TiO2 by sol-gel method, preparation of Cu2O/(001)TiO2 by impregnation-reduction, loading catalysts onto polyester fiber carrier. Photocatalytic tests involved placing loaded carrier in a sealed reactor, introducing ammonia gas at controlled flow rates (0.5, 1, 2 L/min), irradiating with a 300 W xenon lamp to simulate sunlight, and measuring ammonia concentration changes over time using the INNOVA detector.

5：5, 1, 2 L/min), irradiating with a 300 W xenon lamp to simulate sunlight, and measuring ammonia concentration changes over time using the INNOVA detector. Data Analysis Methods:

5. Data Analysis Methods: Degradation rate calculated as (Cin - Cout)/Cin × 100%. Characterization data analyzed using software associated with each instrument (e.g., XRD for crystal phase, UV-Vis for optical properties, PL for electron-hole recombination). Band gaps calculated using the Kubelka-Munk method from DRS spectra.