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(a) The UV absorption spectrum of the azo dye solutions decolored by G-MgZn powders for different time at 30°C. The color spectrum bar is shown for guidance. (b) The degradation process by four different powder samples is indicated. (c) The comparison of the reaction efficiency of different metallic powders. (d) The high-resolution SEM image of the surface morphology of the reacted Mg73Zn21.5Ca5.5 glassy powder particle.
