enhanced photocatalytic activity of se-doped tio 2 under visible light irradiation - solar energy traffic lights

Ruiti type ti02 is a typical photo catalyst, and its excellent performance is limited in the UV range due to its broadband gap of 3. 2u2009eV. A series of Se-
Ti02 nanoparticles mixed with ruiti-type structures with different Se concentrations of up to 17. 1u2009at.
% Is prepared using sol-gel method.
It is confirmed that the doping Se ions are mainly in the valence state of the u2009 4, which provides additional electron states in the band gap of tio.
When the energy gap is minimum 2, the band gap is effectively reduced.
17 ev, and the catalytic activity was effectively improved due to the expansion of the absorption range.
By degradation of rudanming B (RhB)
In aqueous solution under visible light irradiation.
The results showed that Se doping significantly increased the catalytic activity of ti02 and 13. 63u2009at. % Se-
The best performance of the doping ti02.
In recent years, global environmental issues have received increasing attention due to serious pollution, especially organic pollutants.
Compared to many other methods, a new pollutant degradation solution is a very effective and eco-friendly photo-catalytic.
Common photo catalysts usually include metal oxides and sulfur oxides such as TiO, zinc oxide, SnO, ZrO, CdS, etc.
Among them, the light catalyst TiO discovered for the first time was studied in depth.
But the energy gap of TiO is 3.
2 ev and 3 of ruiti phase.
The main phase is 0ev ev.
Therefore, TiO has little activity under visible light irradiation and therefore cannot make full use of sustainable solar energy.
Many efforts have been made to overcome these shortcomings and improve the catalytic performance of TiO, especially in the visible light range.
For example, ion doping, trititanium-
Presence or phase of p-in-phase
The formation of n heterogeneous bodies is explored.
Among them, ion doping is an effective method.
Many elements are mixed into TiO such as Ag, Fe, N, S, C, and B.
Doping ions can introduce new energy levels to reduce the energy band gap of TiO and enhance the catalytic activity of TiO, especially under visible light irradiation.
In addition, electronic
Due to the formation of charge capture sites by foreign ions, the pore composite rate can be effectively reduced. Selenium (Se)
In the same set of elements as oxygen (O)
In the periodic table of elements.
Se has a cation (Se, Se)and anionic (Se)
Characters, it is recommended to introduce additional electronic states in the band gap by calculation.
However, the TiO of Se-doping has not been widely studied. Zhang .
SeO/TiO nano-composite materials have been prepared, in which electrons-
Due to the formation of heterogeneous structures, hole pairs may be effectively suppressed, and absorption may extend to visible light due to the narrow band of 2.
By reducing the 0 ev of seev, se.
Se is doped into the ruititanium TiO by various methods, and the energy gap is narrow, and the absorption is effectively extended to the visible light range.
Therefore, a significantly enhanced catalytic activity was obtained under visible irradiation.
However, due to the ease of sublimation, the concentration of Se doping is quite low (315–317u2009°C)
SeO In The Calcining process.
In order to further reduce the band and improve the catalytic activity under visible light, a higher concentration of Se should be doping in TiO.
In this paper, we have significantly increased the doping concentration of Se to 17. 1u2009at.
By reducing the pre-burn temperature, % of TiO is accounted.
Effectively reduce the band and improve the catalytic activity under visible light.