1：Experimental Design and Method Selection:

A facile two-step process involving hydrolysis and sulfidation using MOF as a template to synthesize hollow NiS/CdS/TiO2 composites.

2：Sample Selection and Data Sources:

NH2-MIL-125 MOF was synthesized solvothermally, and composites were prepared with varying amounts of CdS and NiS.

3：List of Experimental Equipment and Materials:

Chemicals included Tetraisopropyl orthotitanate, DMF, methanol, cadmium acetate dihydrate, thioacetamide, nickel nitrate hexahydrate, etc., from Sinopharm Chemical Reagent and Macklin Biochemical Co. Equipment included SEM (EPMA-8705QH2, Shimadzu), TEM (JEM-1230, JEOL), XRD (Bruker D8-Discover), XPS (2000 XPS system), UV-vis spectrophotometer (UV-3600, Shimadzu), PL spectrometer (Shimadzu RF-5301), electrochemical workstation (CHI760D), gas chromatograph, and Pyrex reaction vessel.

4：Experimental Procedures and Operational Workflow:

Synthesis involved preparing NH2-MIL-125, then CdS/h-TiO2 via sulfurization, followed by in-situ photodeposition of NiS. Photocatalytic tests were conducted under visible light with sacrificial reagents, and characterization was performed using various techniques.

5：Data Analysis Methods:

Data were analyzed using software associated with the equipment, with statistical techniques not specified.