Figure 7

Changes in the UV-vis spectra during the removal of MB by (a) Cu@CuS, (b) Cu@CuS-2, (c) Cu@CuS-2-3, (d) CuS@Cu₉S₅-1, (e) Degeneration curves for MB by different samples, (f) Kinetics study for the degradation of MB: the inset shows the first order rate constant for Cu@CuS, Cu@CuS-2, Cu@CuS-2-3, CuS@Cu₉S₅-1.