TY - JOUR
T1 - Enhanced photocatalytic degradation of π-donor organic compounds by N,N′-dialky 1-4,4′-bipyridinium-modified TiO2 particles
AU - Ranjit, Koodali Thazhathaveetil
AU - Joselevich, Ernesto
AU - Willner, Itamar
PY - 1996/10/4
Y1 - 1996/10/4
N2 - TiO2 powders (Degussa P-25) were modified by a bipyridinium V2+ monolayer. The resulting modified V2+-TiO2 photocatalyst reveals enhanced activities for the light-induced degradation of the series of organic compounds, 1,4-dimethoxybenzene (1), 1,2-dimethoxybenzene (veratrole) (2), indole (3) and eosin (4), exhibiting electron donor properties. Photodegradation of p-chlorobenzaldehyde (5) which lacks electron donor properties is inhibited in the presence of the modified photocatalyst V2+-TiO2, whereas it degrades in the presence of unmodified TiO2. The enhanced photodegradation of the series of electron-rich compounds is attributed to the formation of a supramolecular donor-acceptor complex with the bipyridinium units at the semiconductor surface. Concentration of the organic materials at the s.c. surface leads to effective utilization of photogenerated O2.- and effective mineralization.
AB - TiO2 powders (Degussa P-25) were modified by a bipyridinium V2+ monolayer. The resulting modified V2+-TiO2 photocatalyst reveals enhanced activities for the light-induced degradation of the series of organic compounds, 1,4-dimethoxybenzene (1), 1,2-dimethoxybenzene (veratrole) (2), indole (3) and eosin (4), exhibiting electron donor properties. Photodegradation of p-chlorobenzaldehyde (5) which lacks electron donor properties is inhibited in the presence of the modified photocatalyst V2+-TiO2, whereas it degrades in the presence of unmodified TiO2. The enhanced photodegradation of the series of electron-rich compounds is attributed to the formation of a supramolecular donor-acceptor complex with the bipyridinium units at the semiconductor surface. Concentration of the organic materials at the s.c. surface leads to effective utilization of photogenerated O2.- and effective mineralization.
KW - Environmental pollutants
KW - Photocatalysis
KW - Photochemical degradation
KW - Semiconductors
KW - Supramolecular photochemistry
UR - http://www.scopus.com/inward/record.url?scp=0030568957&partnerID=8YFLogxK
U2 - 10.1016/s1010-6030(96)04396-1
DO - 10.1016/s1010-6030(96)04396-1
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AN - SCOPUS:0030568957
SN - 1010-6030
VL - 99
SP - 185
EP - 189
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 2-3
ER -