Innovative and stable TiO 2 supported catalytic surfaces removing aldehydes under UV-light irradiation

Abstract

The present study reports the photocatalytic degradation of aldehydes using TiO 2 impregnated polyester (PES) and glass fiber (GFT)-TiO 2 addressing the photocatalytic degradation aldehydes (air-solid interface). The PES-TiO 2 optical absorption was determined by diffuse reflectance spectroscopy (DRS). By X-ray diffraction (XRD), the formation of TiO 2 anatase on the PES surface was detected. The photocatalytic oxidation (PCO) of butyraldehyde and isovaleraldehyde was carried out in a batch photo-reactor equipped with a UV-mercury Philips 9W lamp and mediated by glass fiber GFT-TiO 2 and PES-TiO 2 surfaces. The removal of these two aldehydes was found to be a function of pollutant concentrations. The stable catalytic reuse of both catalysts reported. A Langmuir Hinshelwood (L-H) model describes the degradation kinetics on PES-TiO 2 and on GFT-TiO 2. The aldehyde degradation by-products were analyzed by gas chromatography mass spectrometry (GC-MS). Three organics intermediates identified during the aldehyde degradation were: acetones, alcohols and fatty acids.

Analysis of a Hybrid Suspended-Supported Photocatalytic Reactor for the Treatment of Wastewater Containing Benzothiazole and Aniline

“…The reactors used for water treatment by photocatalysis can be classified into two main configurations: reactors with suspended photocatalytic particles and reactors with immobilized photocatalyst. Systems based on the use of suspended catalyst were preferred due to their large active surface area per unit volume and the ease of regenerating once used with a simple wash with deionized water [12,21,50]. The configuration supported does not require a downstream separation stage either by decanting tanks or a cross-flow filtration system, to allow the reactor to operate continuously, but requires maintenance processes for reuse the catalyst after each use as a result of fouling [19].…”

“…Regarding the recovery of TiO 2 particles, using a concentration of 100.0 mg L −1 , instead of 2.0-3.0 g L −1 dosage used by Bansal et al [18], would considerably facilitate their separation by means of a tangential membrane filtration. Operating costs would not increase because of the improvement in degradation yields of approximately 25%, since there is no need of having to resort to a highly complex supported configuration using pebbles, glass spheres or silica gel beads [12,[19][20][21][22].…”

“…On the other hand, the generated holes oxidize the adsorbed water generating hydroxyl radicals (HO − ) on the TiO 2 surface. Next, these generated radical species will be in charge of oxidizing the organic compounds present in the aqueous reaction medium to produce CO 2 [2,12]. The extent of the degradation can be conditioned by the adsorption of the organic compounds [13][14][15].…”

“…Although photocatalysis in suspension is becoming important within AOPs, the recovery of the catalyst has been always a challenge to its commercial implementation [2,16,17]. The immobilization of the catalyst on a support could overcome this limitation [12,16,[18][19][20][21][22].…”

Preparation of CdS Nanoparticles-TiO2 Nanorod Hererojunction and Their High-Performance Photocatalytic Activity

“…BET, SEM, and other tests showed that the specific surface area of the TiO 2 (40%)@CdS composite was the largest. TiO 2 nanorods and CdS particles were uniformly distributed in the composite, and the optical response range was extended to the visible light region.Catalysts 2020, 10, 441 2 of 14 coating, the nitric oxide (NO x ) in the atmosphere [8,9], sulfur oxide [10,11] and other pollutants such as halogenated hydrocarbons [12,13], aldehydes [14], and polycyclic aromatic hydrocarbons from automotive exhaust gas can be absorbed and degraded [15,16]. TiO 2 also shows a good performance in light-sensitive solar cells [17] and biomedical devices [18].…”