Pharmaceutical residues in aquatic environments have the potential to induce bacterial resistance. subsequently complicating disease treatment and posing a substantial hazard to public health. This study demonstrates the production of carbon dots from Cassia fistula flowers using a hydrothermal process. The obtained carbon dots were then mixed with zinc oxide to create CDs@ZnO-H400. https://smokeysmountainfurnitureoutlets.shop/product-category/pendant/