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Figure 1. SEM images of photocatalysts synthesized using different methods:
photodeposition (PD) and chemical reduction (CR). (A) Au-TiO2(PD-HI)15min; (B) Au-
TiO2(PD-HI)120min; (C) Au-TiO2(CR); (D) Pt-TiO2(PD-HI)15min and (E) Pt-TiO2(PD-
HI)120min.
Au
Au
Au
(A) (B)
(D)
(E)
Pt
Pt
Pt
Pt
(C)
Au
Figure 2. TEM images of metallized S-TiO2. (A) and (B) Au-TiO2 catalysts prepared by
PD method using 140 W/m2 of light intensity and different deposition time 15 and 120 min,
respectively. (C) and (D) Pt-TiO2 samples prepared by photodeposition method and
different deposition time 15 and 120 min, respectively.
(C) (D)
-
Figure 3. XRD patterns for TiO2 and M-TiO2 photocatalysts (M=Au or Pt) prepared by
chemical reduction (CR) and photochemical deposition (PD) using 120 min of deposition
time.
20 30 40 50 60 70 80
Pt-TiO2 (PD)
Au-TiO2 (PD)
Au-TiO2 (CR)
Inte
nsi
ty (
a.u)
2
S-TiO2
Figure 4. UV-Vis DRS spectra for the investigated photocatalysts.
200 300 400 500 600 700 800
0,0
0,2
0,4
0,6
0,8
1,0
Abso
rban
ce (
a.u)
Wavelenght (nm)
S-TiO2
Au-TiO2(PD -HI) 15min
Au-TiO2(PD-HI) 120min
Pt-TiO2(PD-HI) 15min
Pt-TiO2(PD-HI) 120min
Au-TiO2(CR)
Figure 5. Discoloration of the Patent blue V as a function of run time over the
photocatalysts analyzed; Patent blue V initial concentration: 7 mg/L; catalyst dosage: 3 g/L.
0
0,2
0,4
0,6
0,8
1
1,2
0 50 100 150 200 250 300 350
C/C
o
Run time [min]
Au-TiO2 (CR)
S-TiO2
Au-TiO2 (PD-LI) 15 min
Au-TiO2 (PD-HI) 120min
Au-TiO2 (PD-LI) 120 min
Au-TiO2 (PD-HI)15 min
UV ON
Figure 6. Total Organic Carbon (TOC) removal as a function of run time over the catalysts
analyzed. Patent Blue V initial concentration: 7 mg/L; catalyst dosage: 3 g/L.
0
0,2
0,4
0,6
0,8
1
1,2
0 50 100 150 200 250 300 350
TOC
/TO
Co
Run time [min]
S-TiO2
Au-TiO2 (CR)
Au-TiO2 (PD-LI) 15 min
Au-TiO2 (PD-LI) 120min
Au-TiO2 (PD-HI) 120min
Au-TiO2 (PD-HI) 15 min
UV ON
Figure 7. Patent blue V discoloration over Au-TiO2(PD-HI)15min catayst, varying the
initial concentration of the dye; catalyst dosage: 3 g/L.
0
0,2
0,4
0,6
0,8
1
1,2
0 50 100 150 200 250 300 350 400 450
C/C
o
Run time (min)
7 mg/L
12 mg/L
3 mg/L
UV ON
Figure 8. Evaluation of Patent blue V adsorption constant on Au-TiO2(PD-HI)15min
catalyst; catalyst dosage: 3 g/L.
y = 751,94x + 2314,4
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
0 5 10 15 20 25
C0*/
C*
C0*
Figure 9. Experimental and predicted data as a function of Patent blue V initial
concentration on Au-TiO2(PD-HI)15min; catalyst dosage: 3 g/L.
0
0,2
0,4
0,6
0,8
1
1,2
0 50 100 150 200
C/C
0*
Irradiation time [min]
Experimental
Model
3 mg/L
12 mg/L
7 mg/L
Figure 10. Total Organic Carbon (TOC) removal over the Au-TiO2(PD-HI)15min catayst,
varying the initial concentration of the dye; catalyst dosage: 3 g/L.
0
0,2
0,4
0,6
0,8
1
1,2
0 50 100 150 200 250 300 350 400 450
TOC
/TO
Co
Run time (min)
7 mg/L
12 mg/L
3 mg/L
UV ON
Figure 11. Patent blue V discoloration over the Au-TiO2(PD-HI)15min catayst, varying the
dosage of the photocatalyst (g/L); Patent blue V initial concentration: 7 mg/L.
0
0,2
0,4
0,6
0,8
1
1,2
0 50 100 150 200 250 300 350
C/C
o
Run time (min)
12g/L
9g/L
6g/L
3g/L
UV ON
Figure 12. Total Organic Carbon (TOC) removal over the Au-TiO2(PD-HI)15min catayst,
varying the dosage of the photocatalyst (g/L); Patent Blue V initial concentration: 7 mg/L.
0
0,2
0,4
0,6
0,8
1
1,2
0 50 100 150 200 250 300 350
TOC
/TO
Co
Run time (min)
6 g/L
3 g/L
9 g/L
12 g/L
UV ON
Figure 13. Patent blue V discoloration over the Pt-TiO2 photocatalyst prepared with 140
W/m2 of light intensity and different deposition time (15 and 120 min); Patent blue V initial
concentration: 7 mg/L; catalyst dosage: 3 g/L.
0
0,2
0,4
0,6
0,8
1
1,2
0 50 100 150 200 250 300 350
C/C
o
Run time (min)
Pt-TiO2 (PD-HI)15 min
Pt-TiO2 (PD-HI)120 min
S-TiO2
UV ON
Figure 14. Total Organic Carbon (TOC) removal over the Pt-TiO2 photocatalyst prepared
with 140 W/m2 of light intensity and different deposition time (15 and 120 min); Patent
Blue V initial concentration: 7 mg/L; catalyst dosage: 3 g/L.
0
0,2
0,4
0,6
0,8
1
1,2
0 50 100 150 200 250 300 350
TOC
/TO
Co
Run time (min)
Pt-TiO2 (PD-HI)120 min
Pt-TiO2 (PD-HI)15min
S-TiO2
UV ON
Figure 15. Comparison of the Patent blue V discoloration and mineralization over the S-
TiO2 and the most effective M-TiO2 photocatalysts; Patent blue V initial concentration: 7
mg/L; catalyst dosage: 3 g/L.
0
10
20
30
40
50
60
70
80
90
100
S-TiO2 Au-TiO2 (PD-HI) 15 min Pt-TiO2 (PD-HI) 120 min
Dis
colo
rati
on
or
min
era
lizat
ion
(%
)
discoloration
mineralization
Figure 16. Evaluation of Patent blue V discoloration and mineralization after 60 minutes of
irradiation on Au-TiO2(PD-HI)15min catalyst for different cycles; Patent blue V initial
concentration: 4.7 mg/L; catalyst dosage: 3 g/L.
0
5
10
15
20
25
30
35
40
45
50
1 2 3 4
% d
isco
lora
tio
n a
nd
min
era
lizat
ion
Cycle