TY - GEN
T1 - Photocatalytic behavior of salicylic acid modified TiO 2 for degradation of Bisphenol A
AU - Chang, Su-Min
AU - Chang, Chen Tuan
PY - 2009/12/1
Y1 - 2009/12/1
N2 -
In this study, we modified the commercial P25 TiO
2
with salicylic acid through a microwave-assisted method. In addition, the photocatalytic behavior of the surface modified TiO
2
for degradation of bisphenol A (BPA) was examined and the role of the organic modifier on the photocatalysis was clarified. The TGA result indicates that the modified TiO
2
contained 2-3% wt of salicylic acid on the surface. Moreover, the FTIR spectra show that C=O stretching absorption of the salicylic acid red-shift from 1658 to 1609 cm
-1
. This result reveals that the organic carbon was chemically bonded to surface of TiO
2
throuth complexation. The modified TiO
2
performed 2.96-fold increases in the kinetic rate constant of the unmodified P25. Dark adsorption reveals that the modified TiO
2
exhibited a high affinity toward BPA under a partition coefficient of 0.15 l/mg. The high adsorption capacity was due to the p-p interaction between salicylic acid and BPA. In addition, the EPR results show that more oxygenated radicals were stabilized in the modified TiO
2
because salicylic acid withdrew the electrons from conduction band of TiO
2
to its aromatic ring through conjugation. The combination effects of surface enrichment for target compounds and inhibited charge recombination resulted in the improved photocatalytic activity of the modified TiO
2
.
AB -
In this study, we modified the commercial P25 TiO
2
with salicylic acid through a microwave-assisted method. In addition, the photocatalytic behavior of the surface modified TiO
2
for degradation of bisphenol A (BPA) was examined and the role of the organic modifier on the photocatalysis was clarified. The TGA result indicates that the modified TiO
2
contained 2-3% wt of salicylic acid on the surface. Moreover, the FTIR spectra show that C=O stretching absorption of the salicylic acid red-shift from 1658 to 1609 cm
-1
. This result reveals that the organic carbon was chemically bonded to surface of TiO
2
throuth complexation. The modified TiO
2
performed 2.96-fold increases in the kinetic rate constant of the unmodified P25. Dark adsorption reveals that the modified TiO
2
exhibited a high affinity toward BPA under a partition coefficient of 0.15 l/mg. The high adsorption capacity was due to the p-p interaction between salicylic acid and BPA. In addition, the EPR results show that more oxygenated radicals were stabilized in the modified TiO
2
because salicylic acid withdrew the electrons from conduction band of TiO
2
to its aromatic ring through conjugation. The combination effects of surface enrichment for target compounds and inhibited charge recombination resulted in the improved photocatalytic activity of the modified TiO
2
.
UR - http://www.scopus.com/inward/record.url?scp=78649770364&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:78649770364
SN - 9780841200050
T3 - ACS National Meeting Book of Abstracts
BT - American Chemical Society - 238th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers
T2 - 238th National Meeting and Exposition of the American Chemical Society, ACS 2009
Y2 - 16 August 2009 through 20 August 2009
ER -