Electronic Supplementary Data
Oxidative degradation of norfloxacin by water soluble colloidal MnO2
in the presence of cationic surfactant
Ajaya Kumar Singha,*, Neelam Sena & Som Kumar Chatterjeeb
a
Department of Chemistry, Government Vishwanath Yadav Tamaskar Post Graduate Autonomous
College Durg, Chhattisgarh, 491 001, India
Email: [email protected]
b
Department of Chemistry, Government Narayan Rao Meghawale Girls College,
Dhamtari Chhattisgarh 493 773, India
No.
Contents
Pg No.
1
Fig. S1 – UV-visible spectral changes during the oxidation of norfloxacin by colloidal
MnO2 in presence of cationic surfactant (CTAB) in alkaline medium at 298 K.
(Experimental conditions: [NOR] = 1.2×10-5 mol dm-3, [MnO2] = 0.6×10-4 mol dm-3,
[OH-] = 1.0×10-3 mol dm-3 and [CTAB] = 10.0×10-4 mol dm-3) with time scanning time
interval of 10 min
2
2
Fig. S2 – GC-ESI-MS spectra of the product of oxidation of norfloxacin by MnO2
2
3
Fig. S3 – First order plots for the oxidation of norfloxacin by colloidal MnO2 in the
presence of CTAB at 298 K. (Experimental Conditions: [NOR] = 1.2×10-3 mol dm-3,
[NaOH] = 1.0×10-3 mol dm-3, [CTAB] = 10.0×10-4 mol dm-3 and [MnO2] = (1) 0.4×10-4, (2)
0.6×10-4, (3) 0.9×10-4, (4) 1.2×10-4, (5) 1.5×10-4 and (6) 1.8×10-4 mol dm-3)
3
4
Fig. S4 – Effect of [CTAB] on kobs for the oxidation of norfloxacin by colloidal MnO2
(Experimental conditions: [NOR] = 1.2×10-3 mol dm-3, [MnO2] = 1.2×10-4 mol dm-3 and
[NaOH] = 1.0×10-3 mol dm-3 at 298 K)
3
5
Table S1 – Effect of [MnO2], [NOR] and [NaOH] on the oxidation of norfloxacin at 298 K.
Experimental conditions [NOR] = 1.2×10-3 mol dm-3, [MnO2] = 1.2×10-4 mol dm-3,
[NaOH] = 1.0×10-3 mol dm-3, [CTAB] = 10.0×10-4 mol dm-3
4
6
Table S2 – Effect of Solvent in percentage on the oxidation of norfloxacin at 298 K.
Experimental conditions [NOR] = 1.2×10-3 mol dm-3, [MnO2] = 1.2×10-4 mol dm-3,
[NaOH] = 1.0×10-3 mol dm-3, [CTAB] = 10.0×10-4 mol dm-3
4
7
Table S3 – Effect of MnCl2 on the oxidation of norfloxacin at 298 K.
Experimental conditions [NOR] = 1.2×10-3 mol dm-3, [MnO2] = 1.2×10-4 mol dm-3,
[NaOH] = 1.0×10-3 mol dm-3, [CTAB] = 10.0×10-4 mol dm-3
4
8
Table S4 – Effect of temperature on the oxidation of norfloxacin at 298 K.
Experimental conditions [NOR] = 1.2×10-3 mol dm-3, [MnO2] = 1.2×10-4 mol dm-3,
[NaOH] = 1.0×10-3 mol dm-3, [CTAB] = 10.0×10-4 mol dm-3
4
1
Fig. S1 – UV-visible spectral changes during the oxidation of norfloxacin by colloidal MnO2 in presence of cationic surfactant (CTAB)
in alkaline medium at 298 K. (Experimental conditions: [NOR] = 1.2×10-5 mol dm-3, [MnO2] = 0.6×10-4 mol dm-3,
[OH-] = 1.0×10-3 mol dm-3 and [CTAB] = 10.0×10-4 mol dm-3) with time scanning time interval of 10 min.
Peak List
m/ z
x10
2
+ Scan (13.509-13.859 min, 71 scans) OT501_1.d
1
415
0.8
0.6
119
0.4
0.2
149
0
50
100
150
281
200
250
300
372
z
102
119
120
135
135
149
281
310
372
415
415
416
416
437
437
797
1
1
Abund.
15235
125773
11655
15613
11634
16206
12693
11898
12686
213354
45517
33480
33313
21297
25522
11528
437
350
400
450
500
550
Counts (%) vs. Mass-to-Charge (m/z)
600
650
700
750
800
Fig. S2 – GC-ESI-MS spectra of the product of oxidation of norfloxacin by MnO2.
2
Fig. S3 – First order plots for the oxidation of norfloxacin by colloidal MnO2 in the presence of CTAB at 298 K.
(Experimental Conditions: [NOR] = 1.2×10-3 mol dm-3, [NaOH] = 1.0×10-3 mol dm-3, [CTAB] =
10.0×10-4 mol dm-3 and [MnO2] = (1) 0.4×10-4, (2) 0.6×10-4, (3) 0.9×10-4, (4) 1.2×10-4, (5) 1.5×10-4 and
(6) 1.8×10-4 mol dm-3).
Fig. S4 – Effect of [CTAB] on kobs for the oxidation of norfloxacin by colloidal MnO2 (Experimental conditions: [NOR] =
1.2×10-3 mol dm-3, [MnO2] = 1.2×10-4 mol dm-3 and [NaOH] = 1.0×10-3 mol dm-3 at 298 K).
3
Table S1 – Effect of [MnO2], [NOR] and [NaOH] on the oxidation of norfloxacin at 298 K.
Experimental conditions [NOR] = 1.2×10-3 mol dm-3, [MnO2] = 1.2×10-4 mol dm-3, [NaOH] =
1.0×10-3 mol dm-3, [CTAB] = 10.0×10-4 mol dm-3
[MnO2] 104
(mol dm-3)
0.4
0.6
0.9
1.2
1.5
1.8
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
[NOR] 103
(mol dm-3)
1.2
1.2
1.2
1.2
1.2
1.2
0.6
1.2
1.8
2.4
3.0
1.2
1.2
1.2
1.2
1.2
1.2
[NaOH]
(mol dm-3)
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.2
0.5
1.0
2.0
3.0
3.5
In the absence of CTAB In the presence of CTAB
kobs 104 (s-1)
kobs 104 (s-1)
6.52
1.53
5.37
1.45
5.09
1.41
4.99
1.37
3.84
0.96
3.45
0.84
2.94
0.81
4.99
1.37
6.33
1.69
7.50
2.07
8.12
2.46
8.70
2.90
6.40
2.10
4.99
1.37
3.84
1.25
3.31
1.09
3.09
0.90
Table S2 – Effect of Solvent in percentage on the oxidation of norfloxacin at 298 K.
Experimental conditions [NOR] = 1.2×10-3 mol dm-3, [MnO2] = 1.2×10-4 mol dm-3, [NaOH]
= 1.0×10-3 mol dm-3, [CTAB] = 10.0×10-4 mol dm-3
[CH3COOH]
(%)
0.0
2.0
4.0
6.0
8.0
10.0
D
75.00
73.62
72.25
70.87
69.50
66.12
In the absence of CTAB
kobs 104 s-1
4.99
5.49
6.15
6.80
7.21
7.99
In the presence of CTAB
kobs 104 s-1
1.37
1.71
2.22
3.18
4.08
7.65
Table S3 – Effect of MnCl2 on the oxidation of norfloxacin at 298 K.
Experimental conditions [NOR] = 1.2×10-3 mol dm-3, [MnO2] = 1.2×10-4 mol dm-3, [NaOH] =
1.0×10-3 mol dm-3, [CTAB] = 10.0×10-4 mol dm-3
10 5 [MnCl2 ]
0.2
0.4
0.6
0.8
1.0
1.2
In the absence of CTAB
kobs 104 s-1
4.99
4.98
4.99
4.99
4.98
4.99
In the presence of CTAB
kobs 104 s-1
1.37
1.38
1.37
1.37
1.37
1.37
Table S4 – Effect of temperature on the oxidation of norfloxacin at 298 K.
Experimental conditions [NOR] = 1.2×10-3 mol dm-3, [MnO2] = 1.2×10-4 mol dm-3, [NaOH]
= 1.0×10-3 mol dm-3, [CTAB] = 10.0×10-4 mol dm-3.
Temperature (K)
293
298
303
308
313
318
In the absence of CTAB
kobs 104 s-1
3.54
4.99
8.84
13.99
19.21
25.05
In the presence of CTAB
kobs 104 s-1
0.88
1.37
2.32
4.22
5.88
6.74
4