Fluorapatite Powder-Based Contact-Electro-Catalyst for Degradation of Organic Dyes

Contact-electro-catalysis (CEC) is an emerging method for organic pollutant degradation, yet its reliance on organic polymer catalysts limits its industrial application because these catalysts exhibit poor photothermal stability and high-temperature deactivation. This study proposed fluorapatite powder as an inorganic catalyst for CEC, enabling dye degradation via ultrasound induction. The degradation rate of rhodamine B (RhB) was 96.1% after 100 min of catalysis. Unlike traditional organic polymer catalysts, fluorapatite can maintain stable activity without light and at elevated temperatures and has excellent reusability. It can also degrade crystal violet (CV), methyl orange (MO), and methylene blue (MB), providing universal applicability and economic advantages for industrial wastewater. This work expands the CEC material system by exploring nonpolymer dielectric alternatives.