Related Experiment Video
Updated: Aug 14, 2026
10:26
Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis
Published on: October 26, 2015
Visible light active platinum-ion-doped TiO2 photocatalyst
Soonhyun Kim1, Seong-Ju Hwang, Wonyong Choi
1School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea.
The Journal of Physical Chemistry. B
|December 27, 2005
Summary
Platinum-ion-doped titanium dioxide (Pt(ion)-TiO2) shows enhanced visible light photocatalytic activity for degrading chlorinated organic compounds. This novel material demonstrates stability and potential for environmental remediation applications.
Area of Science:
- Materials Science
- Environmental Chemistry
- Photocatalysis
Background:
- Titanium dioxide (TiO2) is a widely studied photocatalyst, but its application is limited by its wide band gap, requiring UV irradiation.
- Developing visible-light-responsive photocatalysts is crucial for efficient solar energy utilization and environmental remediation.
Purpose of the Study:
- To synthesize platinum-ion-doped TiO2 (Pt(ion)-TiO2) using a sol-gel method.
- To investigate the visible light photocatalytic activities of Pt(ion)-TiO2 for the degradation of chlorinated organic compounds.
- To characterize the properties and understand the reactivities of the synthesized material.
Main Methods:
- Sol-gel synthesis of Pt(ion)-TiO2.
- Characterization using X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS).
- Photocatalytic degradation experiments under visible and UV irradiation.
Main Results:
- Pt(ion)-TiO2 exhibited a lower band gap (by 0.2 eV) and a positively shifted flat band potential compared to undoped TiO2.
- Pt(ion)-TiO2 showed enhanced photocatalytic activity under both UV and visible light.
- Optimal calcination temperature and Pt ion concentration were found to be 673 K and 0.5 atom %, respectively.
- Pt(ion)-TiO2 degraded dichloroacetate and 4-chlorophenol oxidatively and trichloroacetate reductively under visible light.
- The photocatalyst demonstrated good reusability under visible light irradiation.
- Pt(ion)-TiO2 showed limitations in degrading certain compounds like tetramethylammonium and trichloroethylene under visible light, unlike UV-illuminated TiO2.
Conclusions:
- Pt(ion)-TiO2 is a promising visible light photocatalyst for the oxidative and reductive degradation of specific chlorinated organic compounds.
- The doping of platinum ions into the TiO2 lattice significantly enhances its photocatalytic performance under visible light.
- Further research is needed to explore the full potential and limitations of Pt(ion)-TiO2 for diverse environmental applications.
Related Concept Videos
01:26Oxygenic Photosynthesis
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate light...
01:27Photosystem I
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...