In order for a semiconductor to be photochemically active, its redox potential must be positive enough for the photogenerated valence band hole to produce adsorbed OH radicals that can oxidise organic pollutants and negative enough for the conduction band electron to reduce adsorbed O2 to superoxide....
This complex plays a key role in the spontaneous generation of superoxide radical ions on the hybrid surface, without requiring any energy source. These radicals remain stable at indirect daylight and room temperature, as ascertained by EPR spectroscopy, which makes this material a powerful green ...
Improved tangent estimate in the nudged elastic band method for finding minimum energy paths and saddle points. J. Chem. Phys. 113, 9978–9985 (2000). Article CAS Google Scholar Henkelman, G., Uberuaga, B. P. & Jónsson, H. A climbing image nudged elastic band method for finding saddle...
The free radical scavenging study demonstrated that although photogenerated superoxide ions and holes contribute to the overall photocatalytic activity, yet, hydroxyl radicals predominantly control the CIP oxidation. The synthesized nanocomposite was re-used up to five cycles and retained 82.98% efficiency ...
TiO2的禁带宽度是3.2eV,吸收波长在紫外光区域,紫外光照射激发产生电子和空穴,光催化降解有机物起主要作用的是电子,还是空穴? 禁带宽度比TiO2小的其它半导体材料岂不是更适合做光催化剂(ZnO、CdS会产生二次污染除外)?TiO2除了廉价、稳定、无污染,禁带宽度合适外还有没有其它的优点?
The analyses showed that the doping of ions would change the energy band structure of nano-TiO2 and produce crystal defects, thus improving the photocatalytic activity. Then, a self-fabricated exhaust gas degradation device was used to carry out the exhaust gas degradation experiments. The results...
Hashimoto, Generation and deactivation processes of superoxide formed on TiO2 film illuminated by very weak UV light in air or water. J. Phys. Chem. B 104 20 (2000), pp. 4934–4938. Kawai and Sakata, 1980. T. Kawai and T. Sakata, Photocatalytic hydrogen production from liquid methanol ...
The crystallite size increased from 25 to 28 nm with the dual doping of Nd and Yb ions, as determined by Scherrer formula. The optical absorption edge of (Nd 5%, Yb 3%) co-doped TiO2 shifted towards a longer wavelength, and hence band gap decreased from 3.38 to 3.03 eV, attributed to...
Aluminum doping tunes band gap energy level as well as oxidative stress-mediated cytotoxicity of ZnO nanoparticles in MCF-7 cells. Sci Rep. 5, 13876 (2015). 65. Lundqvist, M. et al. Nanoparticle size and surface properties determine the protein corona with possible implications for biological ...
Similarly, the photogenerated holes present on superoxide the surface with the surface adsorbed hydroxyl ions to form highly reactive HO•. These highly reactive rroaafddTiicciOaall2saaannrieodrnRessP(p•orOena2s−ci-)t ble for the photodegradation and mineralization of pollutants. Scientific ...