1.03 eV 2.99 eV

hv (eV)

1.0 1.5 2.0 2.5 3.0 3.5 4.0

(Ahv)

0.5

1 2 3 4 5 6

AC

Figure S1. Plot of (αhʋ) 2 vs. photon energy for AC.

hv (eV)

1.0 1.5 2.0 2.5 3.0 3.5 4.0

(Ahv)

0.5

0.0 .5 1.0 1.5 2.0 2.5 3.0 3.5

P25

Figure S2. Plot of (αhʋ) 2 vs. photon energy for TiO2 (Degussa P25) .

1.03 eV

2.99 eV

hv (eV)

1.0 1.5 2.0 2.5 3.0 3.5 4.0

(Ahv)

0.5

0.0 .5 1.0 1.5 2.0 2.5 3.0

TiO₂

Figure S3. Plot of (αhʋ) 2 vs. photon energy for TiO2 prepared by sol–gel method.

hv (eV)

1.0 1.5 2.0 2.5 3.0 3.5 4.0

(Ahv)

0.5

0 1 2 3 4 5 6

TiO₂/5AC

Fig. S4 plot of (αhʋ) 2 vs. photon energy for TiO

2

/5AC 2.27 eV

2.96 eV

hv (eV)

1.0 1.5 2.0 2.5 3.0 3.5 4.0

(Ahv)

0.5

0 1 2 3 4 5

TiO₂/10AC

Figure S5. Plot of (αhʋ) 2 vs. photon energy for TiO2/10AC.

hv (eV)

1.0 1.5 2.0 2.5 3.0 3.5 4.0

(Ahv)

0.5

.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

TiO₂/20AC

Figure S6. Plot of (αhʋ) 2 vs. photon energy for TiO2/20AC.

2.15 eV

1.80 eV

hv (eV)

1.0 1.5 2.0 2.5 3.0 3.5 4.0

(Ahv)

0.5

1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

TiO₂/25AC

Figure S7. Plot of (αhʋ) 2 vs. photon energy for TiO2/25AC.

hv (eV)

1.0 1.5 2.0 2.5 3.0 3.5 4.0

(Ahv)

0.5

1 2 3 4 5 6

TiO₂/30AC

Figure S8. Plot of (αhʋ) 2 vs. photon energy for TiO2/30AC.

1.41 eV

1.13 eV

Figure S9. Dye removal of AC TiO2 TiO2 (P25) and TiO2/AC in the presence of UV–light illumination.

Figure S10. ln C/Co vs time for AC TiO2 TiO2 (P25) and TiO2/AC in the presence of UV–light illumination for dye removal.

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00

0 20 40 60 80 100 120 140 160 180

AC TiO2 TiO2 P25 TiO2/5AC

TiO2/10AC TiO2/20AC TiO2/25AC TiO2/30AC

C /C

o

Time (min)

-12 -10 -8 -6 -4 -2 0

0 20 40 60 80 100 120 140 160 180 200

AC TiO2 TiO2 (P25) TiO2/5AC TiO2/10AC TiO2/20AC TiO2/25AC TiO2/30AC

Time (min)

ln C /C

o