Table 1 Chemical analyses, by SEM-EDS, of both pristine16 and KCl treated fibres (3 cycles). Standard deviations are reported in parenthesis.
From: The mechanism of iron binding processes in erionite fibres
Oxides (wt.%) | Pristine | KCl treated | KCl treated FeCl2 |
|---|---|---|---|
SiO2 | 60.06 (47) | 57.35 (14) | 58.58 (60) |
Al2O3 | 12.81 (19) | 12.78 (8) | 12.82 (17) |
Na2O | 4.03 (27) | 1.46 (11) | 0.67 (27) |
K2O | 4.01 (42) | 9.32 (13) | 6.74 (67) |
MgO | 0.59 (24) | 0.59 (9) | 0.75 (22) |
CaO | 0 | 0 | 0 |
FeO | 0 | 0 | 1.94 (38) |
H2O* | 18.50 | 18.50 | 18.50 |
Total | 100.00 | 100.00 | 100.00 |
Si | 28.76 (11) | 28.51 (5) | 28.62 (10) |
Al | 7.24 (11) | 7.49 (5) | 7.38 (10) |
Na | 3.75 (27) | 1.41 (10) | 0.63 (29) |
K | 2.45 (27) | 5.91 (9) | 4.20 (45) |
Mg | 0.42 (17) | 0.44 (7) | 0.55 (15) |
Ca | 0 | 0 | 0 |
Fe | 0 | 0 | 0.79 (15) |
O | 72.10 (14) | 72.35 (4) | 72.07 (17) |
H2O | 29.60 (17) | 30.73 (4) | 30.20 (25) |
R | 0.799 (3) | 0.792 (1) | 0.795 (3) |
M/(M + D) | 0.936 (27) | 0.944 (9) | 0.896 (46) |
E% | 3.1 | −8.6 | −1.7 |
Tot. s.s. EF cat. (e−) | 92.8 | 133.0 | 114.0 |
