(c) (d) Figure 1. Scanning electron microscope (SEM) images of: (a) pure activated carbon (AC) granules, showing different size, shape and surface texture of each granule, scale bar: 400 micron. (b) a pure AC granule showing channel-like interconnected cylindrical pores in it, scale bar: 20 micron. (c) Ag impregnated AC (Ag-AC) granule, showing Ag particles and clusters (as bright white spots), made by in-situ impregnation and chemical reduction to Ag, scale bar: 50 micron. (d) higher magnification image of Ag-AC granule of Fig. 1(c), showing Ag particles both inside the pore and on the external surface of the granule, scale bar: 10 micron.
