1：Experimental Design and Method Selection:

A one-step hydrothermal method was employed to synthesize Cu2S–MoS2 nanocomposites with varying ratios, using ionic liquid [BMIM]SCN as a key component. Time-dependent experiments were conducted to study the formation mechanism.

2：Sample Selection and Data Sources:

Precursors included Cu(CH3COO)2·H2O and (NH4)6Mo7O24·4H2O in different proportions, with [BMIM]SCN or TAA as sulfur sources. Samples were characterized using various techniques.

3：List of Experimental Equipment and Materials:

Autoclave for hydrothermal synthesis, X-ray diffractometer (Bruker D8 FOCUS), SEM (ZEISS MERLIN Compact), TEM (Tecnai G2 F20), UV-Vis spectrophotometer (Cary 100, Shimadzu UV-2450), XPS (Kratos Axis Ultra DLD), surface area analyzer (Autosorb-1-MP 1530VP), ICP spectrometer (Varian 725-ES), elemental analyzer (Elementar vario EL cube).

4：Experimental Procedures and Operational Workflow:

Precursors were dissolved in deionized water, stirred, transferred to an autoclave, heated at 200°C for 24 h, washed, and dried. Photocatalytic tests involved dispersing catalyst in MB solution, stirring in darkness for equilibrium, irradiating with a 500 W Xe lamp, sampling at intervals, centrifuging, and analyzing supernatant with UV-Vis.

5：Data Analysis Methods:

XRD for crystalline structure, SEM/TEM for morphology, XPS for elemental valence, BET for surface area, UV-Vis for optical properties and degradation kinetics (rate constants calculated from ln(C0/C) vs. time plots).