RaymondYerkes
Release Time:
3月 19, 2024, 5:43 下午
This popular science worker has profound professional knowledge and rich practical experience. They have a comprehensive and in-depth understanding of coating materials, production processes and application fields and have accumulated research experience, and can accurately grasp the market dynamics and technological development trends to provide readers with professional and reliable information consulting services and solutions.
Titanium dioxide (TiO2) and zinc oxide (ZnO) are two semiconductor materials that have been widely used in photocatalysis due to their favorable band gap energy and high stability.
1. Titanium Dioxide (TiO2): With a band gap of 3.2 eV, titanium dioxide is one of the most extensively studied photocatalysts due to its strong oxidizing power, high chemical stability, non-toxicity, and low cost. It can absorb ultraviolet light (< 387 nm) and produce electron-hole pairs. These electrons and holes can then react with water and oxygen to produce hydroxyl radicals and superoxide ions, respectively. These reactive species can then decompose organic pollutants present in the environmental or industrial waste.
2. Zinc Oxide (ZnO): ZnO, with a bandgap of 3.37 eV, has also been extensively used as a photocatalyst for the degradation of numerous pollutants. Similar to TiO2, ZnO can generate electron-hole pairs upon absorption of UV light. The photogenerated carriers of ZnO show strong oxidation and reduction power, which can decompose water and various organic pollutants. Zinc oxide also has a large exciton binding energy (60 meV) that makes it excellent for optoelectronic applications.
Both TiO2 and ZnO have been applied in various environmental and energy fields, including water and air purification, self-cleaning surfaces, antimicrobial activity, hydrogen production through water splitting, and photocatalytic degradation of pollutants.
The photocatalytic activity of these materials can be further improved by doping them with other elements, coupling them with other semiconductors, or modifying their structures to create more active sites or extend the light absorption range.