Boosting TiO2 Nanoparticles for a Cleaner Environment

TiO2 nanoparticles are like tiny superheroes in the world of environmental science. They help clean up pollutants, but they need a boost to work better under visible light. Scientists have found a way to make them more powerful by adding tiny amounts of aluminum and sulfur.

The Power of Doping

When these elements are added, they change the structure of TiO2. Pure TiO2 is mostly in the anatase phase, but with doping, some of it turns into the rutile phase. The amount of rutile varies depending on how much aluminum and sulfur are added. This change in structure also affects how TiO2 absorbs light. The doped nanoparticles can absorb more visible light, making them more effective.

Defects That Enhance Performance

The dopants also create defects in the lattice structure, which can be seen through various tests. These defects help improve the photocatalytic activity of TiO2. When tested with methylene blue dye, the doped nanoparticles showed much higher degradation rates compared to pure TiO2.

• Best performing sample: Degraded 96.4% of the dye in 150 minutes.
• Pure TiO2: Only managed 15% degradation.

The Future of Environmental Remediation

The key takeaway is that doping TiO2 with aluminum and sulfur makes it more effective at breaking down pollutants under visible light. This could lead to better environmental remediation technologies. However, it's important to note that the exact mechanisms and long-term effects of these dopants need further study.