MEKANISME DEGRADASI FOTOELEKTROKATALITIK DYE PADA ELEKTRODA LAPIS TIPIS TiO2 TERSENSITISASI 4,4â-DIKARBOKSI-2,2,-BIPIRIDIN.
MEKANISME DEGRADASI FOTOELEKTROKATALITIK DYE PADA ELEKTRODA LAPIS
TIPIS TiO2 TERSENSITISASI 4,4’-DIKARBOKSI-2,2,-BIPIRIDIN
Sayekti Wahyuningsih, Candra Purnawan
ARTICLE
PHOTOELECTROCATALYTIC DEGRADATION OF CATIONIC DYE BY DYE
SENSITIZED TiO2 ELECTRODE
Sayekti Wahyuningsih, Candra Purnawan, Puspa Ayu Kartikasari, Novita P, Lila
Prasetyawati, Putri Dwi Purwanti, Widiya Nurhidayatika.
Inorganic Materials research Group of Inorganic chemistry, Chemistry Department
Faculty of Mathematic and Natural Science , Sebelas Maret University.
Ir. Sutami Street 36A Kentingan Surakarta, Central Jawa, Indonesia.
ABSTRACT
Titanium dioxide is a promising catalyst in photodegradation of organic pollutants in water due
to its inexpensiveness, strong oxidizing power, non-toxicity and long-term photostability. This
study presents the production of titanium dioxide using sol-gel process.
Sensitization of titanium dioxide was done using Fe-pyridyl complexes of 2,2’-bipiridine, 2,2dicarboxy-4,4-biquinoline, and phenantroline. Photoelectrocatalytic degradation of Rhodamine B
(RB) using this electrode was investigated. The extremally applied anodic bias can withdraw the
excited electrons to a counter electrode and results in a decrease in the recombination rate of
photogenerated electron and hole. The anodic potential was an important parameter in the
process of photoelectrocatalytic degradation of RB. The effect of applied potential was
determined by using a series of potentials from +2.0V to -2.0V, while other conditions were
degradation time 15, 90 and 180 min and pH 8.0. The change of the absorbance of RB with
various potentials indicated that the absorbance of RB in solution systems with the sensitized
TiO2 electrodes decreased with increasing anodic potential bias. The decrease seemed to
approach a limiting value gradually when the potential was up to +1.0V. When the sensitized
TiO2 used as a photoanode by applied positive bias, the photoelectrocatalytic of RB following by
excitation of sensitizer S mechanism. By contrast, when the sensitized TiO2 used as a cathode
by applied negative bias, the photoelectrocatalytic of RB following by direct electrochemical
mechanism. Evaluation of photoelectrocatalytic degradation of Rhodamin B were irradiated
under 35 watt white halogen lamp.
TIPIS TiO2 TERSENSITISASI 4,4’-DIKARBOKSI-2,2,-BIPIRIDIN
Sayekti Wahyuningsih, Candra Purnawan
ARTICLE
PHOTOELECTROCATALYTIC DEGRADATION OF CATIONIC DYE BY DYE
SENSITIZED TiO2 ELECTRODE
Sayekti Wahyuningsih, Candra Purnawan, Puspa Ayu Kartikasari, Novita P, Lila
Prasetyawati, Putri Dwi Purwanti, Widiya Nurhidayatika.
Inorganic Materials research Group of Inorganic chemistry, Chemistry Department
Faculty of Mathematic and Natural Science , Sebelas Maret University.
Ir. Sutami Street 36A Kentingan Surakarta, Central Jawa, Indonesia.
ABSTRACT
Titanium dioxide is a promising catalyst in photodegradation of organic pollutants in water due
to its inexpensiveness, strong oxidizing power, non-toxicity and long-term photostability. This
study presents the production of titanium dioxide using sol-gel process.
Sensitization of titanium dioxide was done using Fe-pyridyl complexes of 2,2’-bipiridine, 2,2dicarboxy-4,4-biquinoline, and phenantroline. Photoelectrocatalytic degradation of Rhodamine B
(RB) using this electrode was investigated. The extremally applied anodic bias can withdraw the
excited electrons to a counter electrode and results in a decrease in the recombination rate of
photogenerated electron and hole. The anodic potential was an important parameter in the
process of photoelectrocatalytic degradation of RB. The effect of applied potential was
determined by using a series of potentials from +2.0V to -2.0V, while other conditions were
degradation time 15, 90 and 180 min and pH 8.0. The change of the absorbance of RB with
various potentials indicated that the absorbance of RB in solution systems with the sensitized
TiO2 electrodes decreased with increasing anodic potential bias. The decrease seemed to
approach a limiting value gradually when the potential was up to +1.0V. When the sensitized
TiO2 used as a photoanode by applied positive bias, the photoelectrocatalytic of RB following by
excitation of sensitizer S mechanism. By contrast, when the sensitized TiO2 used as a cathode
by applied negative bias, the photoelectrocatalytic of RB following by direct electrochemical
mechanism. Evaluation of photoelectrocatalytic degradation of Rhodamin B were irradiated
under 35 watt white halogen lamp.