The SEM micrographs of chitosan, Ca-bentonite and Ca-bentonite/chitosan composite were taken at 3000 magnification showed on Figure 2. These image illustrated that surface of chitosan tight and porous and after forming composite with Ca-bentonite appeared that coverage of Ca-bentonite by chitosan. Elemental identification of surface features were performed by EDX listed in table 2.

Fig. 2. SEM micrograph of samples (a) chitosan, (b) bentonite and (c) Ca-bentonite/chitosan composite

Tabel 2. Result of elements Chitosan, Ca-bentonite and Ca-bentonite/chitosan composite
Elements Chitosan (% w) Ca-bentonite (% w) Ca-bentonite-chitosan composite (% w)
C
N
O
Na
Ca
Mg
Al
Si
Fe 48.41
49.35
0.64
-
1.60
-
-
-
- -
-
50.03
0.01
2.63
0.22
17.85
29.14
0.12 16.56
15.28
38.44
0.02
8.45
0.23
9.31
10.50 …show more content…
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