690639.fig.003a
(a)
690639.fig.003b
(b)
690639.fig.003c
(c)
690639.fig.003d
(d)
Figure 3: SEM images of the products at different experiment parameters ((a)-(b)) without the addition of Zn powder and ((c)-(d)) the addition of Zn powder, without the addition of Zn(NO3)2.