Sulfonated cobalt(II) phthalocyanine is widely used as a catalyst in various chemical reactions, particularly in oxidation processes. It is highly effective in the desulfurization of fuels, helping to reduce sulfur content and meet environmental regulations. Additionally, it is employed in wastewater treatment to degrade organic pollutants, making it a valuable tool in environmental remediation. Its ability to catalyze the decomposition of hydrogen peroxide makes it useful in industrial bleaching processes. In the field of electrochemistry, it serves as a mediator in biosensors, enhancing their sensitivity and performance. This compound is also utilized in the synthesis of fine chemicals and pharmaceuticals, where its catalytic properties improve reaction efficiency and selectivity.