Electronic Supplementary Material (ESI) for Photochemical & Photobiological Sciences.
This journal is © The Royal Society of Chemistry and Owner Societies 2015
2
I (mA)
0,1
0,0
1
-0,1
-0,2
-0,8
-0,6
-0,4
-0,2
0,0
V vs. SCE (Volts)
Figure 1S- Cyclic voltammetry curves for a TiO2 (P25) in: (1) 0.01 M NaHCO3 at pH 7.2 ; (2) 0.01
M NaHCO3 bubbled with CO2 until pH 5.5. Scan rate: 50 mV/s
Intensity (a. u.)
CO2/H2O at pH 4
NaHCO3/CO2 (0.01 M) at pH 5.5
400
450
500
550
600
Wavelength (nm)
Figure 2S. Emission intensity of 7-hydroxycoumarin measured at 455 nm obtained upon
illumination (15 min) of deaerated suspensions of TiO2-P25 containing coumarin (1 x 10-4 M).
Compare with data of Figure 3 in the text.
2
Intensity (a.u.)
1
3
350
400
450
500
550
600
650
Wavelength (nm)
Figure 3S. Emission intensity of 7-hydroxycoumarin measured at 455 nm obtained upon
illumination (15 min) of deaerated suspensions of TiO2-P25 containing coumarin (1 x 10-4 M), at
pH 7.2 in the absence of NaHCO3 (1); at pH 10 in the absence of NaHCO3 (2); at pH 10 in the
presence of NaHCO3/Na2CO3 (3).
°
4.6 G
°
Intensity (a.u.)
°
°
°
°



^
CO3_
*

^
^
OH ^
15,7 G
*
3420
3430
3440
3450
*
3460
3470
3480
Magnetic Field (Gauss)
Figure 4S. EPR spectrum of the paramagnetic adducts obtained on illumination ( > 360 nm) of
deaerated aqueous suspensions of Ru-TiO2 in the presence of pbn (0.1 M) and of NaHCO3 (0,01 M)
at pH 7.2  7.5.