Abstract Chemical oxygen demand-COD is essential for water pollution control and monitoring and is also used to validate wastewater treatment technologies. Conventional COD determination use of costly toxic inputs that do not align with Sustainable Development Goals 6. To address these environmental challenges. photocatalytic (PC)- and photoelectrocatalytic (PEC)-COD sensors have emer... https://4thmoontoyers.shop/product-category/mid-ships/