“…At desired time intervals, the reaction mixture was sampled and centrifuged for further measurement by a UV–vis spectrophotometer at wavelengths of 275, 320, 356, 463, 505, and 554 nm for CIP, MNZ, TC, MO, ARG, and RhB, respectively. The concentration of PMS was measured by a spectrophotometric method using potassium iodide . To evaluate the stability of 3D–Cu-Ti, the used 3D–Cu-Ti alloy was washed with water and dried for subsequent cycling tests.…”