<![CDATA[Hydrogen production is one of the important efforts in transitioning from fossil energy to renewable energy due to its ability to reduce carbon emissions. This study presents a pumice-supported g-C3N4/BiOBr photocatalyst for hydrogen production and reducing pollutants in seawater. Pumice has cavities that make it float on water, allowing the photocatalyst to be exposed to light and activated. The catalyst in the form of nanocomposites was synthesized using a direct calcination immobilized on pumice stone and characterized using Scanning Electron Microscopy with Energy Dispersive X-ray (SEM-EDX), X-ray Diffraction (XRD), UV-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS), Photoluminescence Spectroscopy (PL-Spectra), Transmission Electron Microscopy (TEM), and X-ray Photoelectron Spectroscopy (XPS). The study indicates the efficacy of the photocatalysis-electrocoagulation combined process for hydrogen production and pollutant degradation in seawater. The combined system achieved an organic pollutant degradation (modelled by methylene blue, MB) of 99.37% and hydrogen production of 211 mL. The enhanced performance was attributed to the ionic interaction between the photocatalytic and electrocoagulation processes, which improved the kinetics of each. However, at low pH, the combination of photocatalysis and electrocoagulation led to increased hydrogen production. At the same time, the degradation of methylene blue (MB) decreased due to a shading effect that diminished the effectiveness of the photocatalytic process in degrading pollutants. The developed pumice-supported g-C3N4/BiOBr photocatalyst effectively absorbs light, and the optimum hybrid process photocatalysis-electrocoagulation parameters offer a promising solution in producing hydrogen and pollutant removal that utilizes seawater as a renewable energy source.]]>
