Aspartic Acid- and Glycine-Functionalized Mesoporous Silica as an Effective Adsorbent to Remove Methylene Blue from Contaminated Water

Figure 4

(a) and (b) SEM images of Asp-MSNs and Gly-MSNs, respectively. (c) and (d) TEM images of Asp-MSNs and Gly-MSNs, respectively.

(a)

(b)

(c)

(d)