T (°C)
k
obs
x 10
–2
/ s
–1
E
a
/ kJ mol
–1
Absent
Fe
2+
Cu
2+
Absent
Fe
2+
Cu
2+
20
25
30
35
40
0.83
1.11
1.67
1.89
2.13
2.14
3.92
4.54
5.24
6.11
1.89
2.15
2.91
3.44
4.32
38.13
37.42
33.33
Table 3:
Rate constants and activation parameters for interaction of MB
+
and SO
3
2−
in the presence of catalyst. ([MB
+
]=20 mg/L; [ SO
3
2−
] = 1.0 mol/dm
3
; [Catalyst] = 0.3 mg/dm
3
; pH = 8-9; T = 30°C).
