Figure 6

UV-vis spectra, as a function of time during catalytic decomposition of dyes in aqueous solution using 0.05 g of D-Cu(II)-ammine composite, [H₂O₂]_o = 0.01 mol/L at 30 °C. (a) [AB]_o = 7.5 × 10^–5 mol/L, (b) [MV]_o = 1.86 × 10^–4 mol/L, (c) The degradation efficiency of the AB and MV2B by D-Cu²⁺ (0.05 g) and D-Cu(II)-ammine composite (0.05 g), [H₂O₂]_o = 0.01 mol/L at 30 °C, and (d) D-Cu(II)-ammine composite recycling during the degradation of AB and MV2B with H₂O₂. (e) XRD of D-Cu(II)-ammine composite before and after the consecutive four catalytic cycles.