1：Experimental Design and Method Selection

The Ag/AgBr/LAO composite was prepared by deposition of metallic Ag nanoparticles onto the pre-prepared AgBr/LAO heterostructure by visible-light photo-reduction. The photocatalytic degradation of methylene blue (MB) was used as a probe reaction to evaluate their photocatalytic activity under visible-light irradiation.

2：Sample Selection and Data Sources

Pristine LaAlO3 (LAO) was synthesized by a simple and facile gel-burning process, using citric acid and ethylene glycol. The Ag/AgBr/LAO composites were prepared by deposition–precipitation method followed by photo-reduction process.

3：List of Experimental Equipment and Materials

Rigaku MiniFlex 600 x-ray diffractometer, Micromeritics (ASAP 2000) analyzer, FEI Verios scanning electron microscope, JEOL 1010 and JEOL 2010 microscopes, Thermo Scientific K-Alpha spectrometer, JASCO V650 UV–Vis spectrophotometer, JASCO IR-5300 spectrometer, JASCO FP-8500 spectrofluorometer.

4：Experimental Procedures and Operational Workflow

The synthesis involved gel-burning for LAO, deposition–precipitation for AgBr/LAO, and photo-reduction for Ag/AgBr/LAO. Photocatalytic degradation of MB was performed under visible-light irradiation at ambient conditions.

5：Data Analysis Methods

The photocatalytic degradation efficiency was expressed as C/C0, where C is concentration of the MB solution at a certain irradiation time, C0 is the initial concentration of MB solution. The kinetic behavior was studied using pseudo-first-order model.