Photocatalytic removal of nitrogen oxides via titanium dioxide

Abstract

We studied the removal of nitrogen oxides pollutants via TiO 2 Degussa P25 powder by photocatalysis. Parameters such as mass of catalyst, geometric irradiated surface, catalyst morphology, and thermal treatment were tested to explain the photocatalytic concentration decrease of nitrogen oxides. According to our working conditions, the conversion rates increased until an optimal value of the TiO 2 weight, 35% of NO concentration and around 20% of NOx, was decomposed by the photocatalysis. The NOx removal increased proportionally with the irradiated geometric surface. The structural transformation of anatase to rutile performed by thermal treatment involved the decrease of the photocatalytic activity.

Nitrogen-modified nano-titania: True phase composition, microstructure and visible-light induced photocatalytic NO abatement

“…where (NO x ) 0 and (NO x ) S are, respectively, the initial NO x and the NO x concentration after a certain irradiation time [60]. Samples were irradiated for 20 min, and all photocatalytic tests were repeated in triplicate, using the very same sample and with the same protocol as the first test, with the aim of checking the repeatability, recyclability and photostability of the prepared photocatalysts.…”

Acetaldehyde adsorption on TiO2: Influence of NO2 preliminary adsorption

“…Among them, NOx may dramatically influence VOC adsorption processes and decomposition mechanisms [23] [24], which may also impact the system efficiency and ageing. Former works did not extensively study the interactions between VOCs and such copollutants into heterogeneous advanced oxidation processes, especially the crucial adsorption step.…”

Titanium dioxide coated cementitious materials for air purifying purposes: Preparation, characterization and toluene removal potential

“…adsorbed water, oxygen and pollutant molecules. Hereby, highly reactive species like the hydroxyl radical ( OH) and the superoxide radical-anion O 2 À are formed, showing strong ability to degrade different micro-organisms [8,9] as well as organic [9,10] and inorganic pollutants [9,11].…”