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The enhancement of photodegradation efficiency using Pt-TiO2 catalyst
1Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Kowloon, China.
Chemosphere
|September 14, 2002
Summary
Platinum (Pt) deposition on titanium dioxide (TiO2) enhances photocatalysis for degrading methylene blue (MB) and methyl orange (MO). The optimized 0.75%Pt-TiO2 catalyst effectively uses visible light and reduces electron-hole recombination.
Area of Science:
- Materials Science
- Photocatalysis
- Surface Chemistry
Background:
- Titanium dioxide (TiO2) is a widely studied photocatalyst.
- Enhancing TiO2 photocatalytic activity, especially under visible light, remains a key challenge.
- Noble metal deposition is a common strategy to improve TiO2 performance.
Purpose of the Study:
- To investigate the effect of platinum (Pt) deposition on TiO2 photocatalysis.
- To understand the mechanism of photosensitization and electron-hole recombination in Pt-TiO2 catalysts.
- To prepare and characterize a novel Pt-TiO2 catalyst for pollutant degradation.
Main Methods:
- Photocatalytic degradation of methylene blue (MB) and methyl orange (MO) under UV and visible light.
- Preparation of Pt-TiO2 catalyst via photoreduction.
- Characterization using UV-Vis absorption, photoluminescence (PL) emission, and X-ray photoelectron spectroscopy (XPS).
Main Results:
- An optimal Pt content of 0.75% resulted in the highest photocatalytic activity for MB and MO degradation.
- The Pt-TiO2 catalyst exhibited significant activity under visible light irradiation.
- Characterization revealed the presence of Pt species (Pt0, Pt2+, Pt4+) and Ti3+ lattice defects, forming a defect energy level.
- This defect level and Pt impurities enhanced visible light absorption and suppressed electron-hole recombination.
Conclusions:
- Platinum deposition on TiO2 significantly enhances its photocatalytic efficiency.
- The optimized 0.75%Pt-TiO2 catalyst is effective for degrading organic pollutants under visible light.
- The improved performance is attributed to enhanced visible light absorption and reduced electron-hole recombination facilitated by Pt species and defect energy levels.
