The present invention relates to a chlorine-assisted cold bromide oxidation process that replaces hazardous soluble mineral acids with self-regenerative and recyclable  solid acid catalysts. These solid acids achieved 95-99% bromine extraction from bromide present in sea/subsoil-brine/standard bromide solutions during cold oxidation.  The catalysts demonstrated self-regeneration properties, were easily recoverable, and could be recycled multiple times. The process eliminates the need for  neutralization steps for the debrominated brine, as no soluble mineral acids were used, enhancing environmental friendliness and sustainability compared to traditional  commercial processes.