1：Experimental Design and Method Selection:

A mild hydrothermal method using phytic acid (IP6) as a soft template was employed to synthesize Cu2(OH)PO4 nanoparticles. The nanoparticles were then coated onto cotton fabrics using a process involving silane coupling agents and dopamine for immobilization.

2：Sample Selection and Data Sources:

White plain weave 100% cotton fabric was used as the substrate. Methylene blue (MB) was used as a model pollutant for photocatalytic degradation tests.

3：List of Experimental Equipment and Materials:

Cotton fabric, Cu(NO3)2·3H2O, Na2HPO4·2H2O, phytic acid (IP6), dopamine, glutaraldehyde, KH550, ethanol, deionized water, MB, hydrogen peroxide. Equipment included XRD, FTIR, SEM, TEM, EDX, XPS, TGA, UV-Vis-NIR spectrophotometer, color spectrophotometer, atomic absorption spectrometer.

4：Experimental Procedures and Operational Workflow:

Synthesis of CHP-IP6 nanoparticles via hydrothermal method at 120°C for 8 hours. Coating of nanoparticles onto cotton fabrics using KH550 and dopamine for functionalization. Characterization of materials using various spectroscopic and microscopic techniques. Photocatalytic activity tests under visible and NIR light using a xenon lamp with cut-off filters, monitoring MB degradation. Self-cleaning tests by applying MB stains and exposing to sunlight.

5：Data Analysis Methods:

Degradation efficiency calculated as C/Co from UV-Vis absorbance at 665 nm. Specific surface area and pore size determined by BET and BJH methods. Elemental analysis via EDS and XPS. Thermal stability assessed by TGA.