Cellulose (2018) 25:1353–1364
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Fig. 2 The microscopic images of the final paper sheets collected in: a —transmitted light, b —reflected light (for PZAg ? _EDTA sample)
10
8
6
4
2
0
Fig. 4 The pH values of the prepared paper sheets
Fig. 3 SEM image of the final paper material with silver- exchanged zeolite ( 1 , 2 , 3 , 4 , 5 —places of EDX measurements)
80
70
60
Table 3 The average values of EDX elemental analysis of paper doped with silver-exchanged zeolite
Element
Wt%
50
C
80 ± 4
40
O
14.5 ± 0.51
30
Al
0.50 ± 0.04
20
Si
0.30 ± 0.03
10
S
0.50 ± 0.05
0
Cl
0.50 ± 0.07
Ag
3.0 ± 0.2
K
0.8 ± 0.1
Fig. 5 Mechanical endurance of paper expressed as zero-span tensile strength
(Fig. 5). The presence of silver or silver oxide crystallites in paper (PAg ? , PAg 0 , PZAg ? ) weakens the strength of cellulose fibres in comparison with the pure paper sample P. This can be explained by the
modification of the hydrogen bonding network with silver cations, which interact directly with –OH groups in cellulose chains or are electrostatically attracted by them as high electronic density is located just on the
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