1：Experimental Design and Method Selection:

Hydrothermal synthesis was used to prepare the MOF [Zn3(L)2(nbta)2]n. Structural characterization involved single-crystal X-ray diffraction, IR spectroscopy, thermal analysis, and luminescence measurements. Photocatalytic degradation experiments were conducted under UV irradiation using a 300 W Hg lamp.

2：Sample Selection and Data Sources:

The MOF was synthesized from zinc ions, L ligand (1,4-bis(benzimidazol-1-yl)-2-butene), and H3nbta ligand (5-nitro-1,2,3-benzenetricarboxylic acid). Rhodamine B (RhB) was used as the model organic dye for degradation studies.

3：List of Experimental Equipment and Materials:

Hydrothermal synthesis setup, UV-Vis spectrophotometer for absorption measurements, powder X-ray diffractometer (PXRD), IR spectrometer, thermal analyzer, luminescence spectrometer, and a 300 W Hg lamp for UV irradiation.

4：Experimental Procedures and Operational Workflow:

Synthesis was carried out hydrothermally. For photocatalytic tests, RhB solutions with the MOF were stirred in the dark for 2 hours to reach adsorption equilibrium, then irradiated with UV light. Samples were taken at intervals to measure degradation via UV-Vis spectroscopy. Trapping experiments used tert-butyl alcohol, benzoquinone, and ammonium oxalate to identify active species.

5：Data Analysis Methods:

Degradation efficiency was calculated from absorbance changes. Kinetic analysis used pseudo-first-order model ln(C0/C) = kt. Band gap was determined from diffuse reflectance using Kubelka-Munk function.