Kinetic Study of Acetaldehyde Degradation Applying Visible Light Photocatalysis

Abstract

A commercially available TiO 2 type (Kronos vlp 7000), doped with carbon and having an extended spectrum of light absorption wavelength, is investigated for photocatalytic degradation of a representative air pollutant, namely acetaldehyde, under visible light. The modeling of the studied system was carried out including the proposal of kinetic expressions for the contaminant degradation and generation of main intermediates based on the reaction mechanism, the mass balances in the reactor, and the lamps' superficial emission model to evaluate the radiation distribution in the reaction space. The predicted and experimental outlet concentrations of acetaldehyde and formaldehyde as main intermediate were found to be in good agreement obtaining a root mean square error equal to 13 %.

Efficiencies Evaluation of Photocatalytic Paints Under Indoor and Outdoor Air Conditions

“…During the acetaldehyde degradation experiments under indoor conditions, only formaldehyde at low concentrations was detected as the photoreaction intermediate (Salvadores et al, 2016). On the other hand, no formic acid was detected within the detection limits (0.05 ppm), which can be an indication of the good degradation performance of the paints under visible light lamps.…”

“…where A TiO2,λ = A TiO2,norm,λ × Weigth/Area is the radiation absorption fraction of the TiO 2 in the paint matrix calculated with the paint specific load of the reactor samples, and F q,λ is the fraction of radiation that can cross the photocatalytic paint and the acrylic support (Salvadores et al, 2016). In the experiment where only one side of the photoreactor is illuminated, i.e., the outdoor-like experiments, F q,λ is equal to zero.…”

An Innovative Air Purification Method and Neural Network Algorithm Applied to Urban Streets

“…A steady-state for the air flow velocities in the street was generated using a stationary solver using a fan. The transport of the VOCs in the street was modeled by coupling the time-dependent advection and diffusion equation to the stationary velocity field vector u (Walsem (Sherwood 1975, Salvadores 2016). The latter was set to 10 −4 m 2 s −1 and it can be found in the literature.…”

Visible light responsive TiO2 photocatalysts for degradation of indoor acetaldehyde

“…3 These chemicals are emitted continuously to the indoor air from household products such as paints, cleaning agents, constructive materials, and furniture. [4][5][6] Many technologies have been investigated to reduce the concentration of indoor VOCs by using mainly CH 3 CHO as a probe molecule. Adsorption on carbon-based materials is the most used technology for the removal of VOCs because of its easy operation.…”