Photocatalytic equipment with nitrogen-doped titanium dioxide for air cleaning and disinfecting

Abstract

Nitrogen-doped TiO 2 nanoparticle photocatalysts were synthesized by a sol-gel procedure using tetra-n-butyl orthotitanate as a titanium precursor and urea as a nitrogen source. Systematic studies for the preparation parameters and their impact on the material's structure were carried out by multiple techniques: thermogravimetric and differential scanning calorimetric analysis, x-ray diffraction, scanning electron microscope, transmission electron microscopy, energy dispersive x-ray spectroscopy and UV-Vis diffuse reflectance spectrophotometry showed that the nitrogen-doped TiO 2 calcined at 500 • C for 3 h exhibited a spherical form with a particle size about 15-20 nm and crystal phase presented a mixture of 89.12% anatase. The obtained product was deposited on a porous quartz tube (D = 74 mm; l = 418 mm) to manufacture an air photocatalytic cleaner as a prototype of the TIOKRAFT company's equipment. The created air cleaner was able to remove 60% of 10 ppm acetone within 390 min and degrade 98.5% of bacteria (total aerobic bacteria and fungi, 300 cfu m −3 ) within 120 min in a 10 m 3 box. These photodegradation activities of N-TiO 2 are higher than that of the commercial nano-TiO 2 (Skyspring Inc., USA, particle size of 5-10 nm).

Low-temperature route to metal titanate perovskite nanoparticles for photocatalytic applications

“…SI-13), respectively. The decrease of band gap of SrTiO 3 after doping with nitrogen can be understood in terms of the formation nitrogen centered energy states between the energy states of SrTiO 3 , owing to replacement of oxide by nitride anions [45]. Visibly, the color of the samples turned from white for SrTiO 3 to yellow for N-SrTiO 3 as shown in the insert of Fig.…”

Photocatalytic activity under visible light irradiation of cement based materials containing TiO2-xNy nanoparticles

“…A recent application is the mixture of photocatalytic solids with building material, which provide a new method for the removal of pollutants from air. This mixture can provide properties such as self-cleaning [1], purification, depollution capacity [2,3] and self-disinfecting [4,5]. Perhaps, the most studied photocatalyst material is the titanium dioxide (TiO 2 ) [6], even with a band gap of 3.2 eV (for anatase phase), that makes that TiO 2 needs to be activated under ultraviolet light [7].…”

Формирование Оксидного Покрытия На Поверхности Титана При Воздействии Лазерного Излучения Фемтосекундной Длительности

“…Фотокаталитические процессы на поверхности диоксида титана позволяют проводить при комнатной температуре окислительную деструкцию большинства органических загрязнений до элементарных неорганических компонентов. Это открывает широкие перспективы использования фотокатализаторов на основе диоксида титана для очистки воды и воздуха [5,6]. В связи с широкой перспективой практического использования данного материала в технике и медицине разработка новых методов его получения и формирования оксидных покрытий является в настоящее время актуальной задачей.…”