Immobilized particle coating for optimum photon and TiO 2 utilization in scaled air treatment photo reactors

Lugo-Vega, Cristina S.; Rosales, Benito Serrano; Lasa, Hugo de

doi:10.1016/j.apcatb.2016.05.063

Cited by 32 publications

(22 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the past few years, numerous photoreactor configurations for PCO (Photocatalytic Oxidation) have been reported in the literature, including fixed-bed reactors [20][21][22], fluidized-bed reactors [23,24], coated honeycomb monolith reactors [25][26][27], fixed powder layer reactors [28,29], annular coated reactors [11,30], and annular mesh-coated Venturi-reactors [2,12,13]. These reactor configurations are relevant given that they determine the PCO process.…”

Section: Commercial Tio2-based Photocatalystsmentioning

confidence: 99%

“…This allows numerical simulations for different reactor configurations and conditions relevant to industrial-scale applications [9,[35][36][37]. It can be anticipated that CFD will help to design, develop, and analyze novel photocatalytic reactors (bench or pilot-scale) for air [2,12,14,38] or water treatment applications [39][40][41] and water splitting for hydrogen production [18,19,42].…”

Section: Commercial Tio2-based Photocatalystsmentioning

confidence: 99%

See 1 more Smart Citation

Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses

Escobedo

Lasa

2020

Catalysts

Self Cite

View full text Add to dashboard Cite

Photocatalysis for air treatment or photocatalytic oxidation (PCO) is a relatively new technology which requires titanium dioxide (TiO2) and a source of light (Visible or near-UV) to degrade pollutants contained in air streams. Present approaches for the photodegradation of indoor pollutants in air streams aim to eliminate volatile organic compounds (VOCs) and viruses, which are both toxic and harmful to human health. Photocatalysis for air treatment is an inexpensive and innovative green process. Additionally, it is a technology with a reduced environmental footprint when compared to other conventional air treatments which demand significant energy, require the disposal of used materials, and release CO2 and other greenhouse gases to the environment. This review discusses the most current and relevant information on photocatalysis for air treatment. This article also provides a critical review of (1) the most commonly used TiO2-based semiconductors, (2) the experimental syntheses and the various photocatalytic organic species degradation conversions, (3) the developed kinetics and computational fluid dynamics (CFD) and (4) the proposed Quantum Yields (QYs) and Photocatalytic Thermodynamic Efficiency Factors (PTEFs). Furthermore, this article contains important information on significant factors affecting the photocatalytic degradation of organic pollutants, such as reactor designs and type of photoreactor irradiation. Overall, this review describes state-of-the-art photocatalysis for air treatment to eliminate harmful indoor organic molecules, reviewing as well the potential applications for the inactivation of SARS-CoV2 (COVID-19) viruses.

show abstract

Section: Commercial Tio2-based Photocatalystsmentioning

confidence: 99%

Section: Commercial Tio2-based Photocatalystsmentioning

confidence: 99%

Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses

Escobedo

Lasa

2020

Catalysts

Self Cite

View full text Add to dashboard Cite

show abstract

“…A wide variety of immobilization methods have been used in photocatalytic pollutant degradation, such as electrophoresis, chemical and physical vapor deposition, sol-gel, thermal spraying, and solvent deposition [ 49 ]. A reliable technique for photocatalyst immobilization must provide a strong photocatalyst support, uniform coating, high degree of photocatalyst irradiation, and preserve photocatalyst structure during preparation and immobilization [ 50 ]. In this work, two solvent deposition methods (SP and DP) and SC were compared because these methods are simple and the soft operational conditions do not provoke changes in the composite structure [ 49 ].…”

Section: Introductionmentioning

confidence: 99%

Performance of rGO/TiO2 Photocatalytic Membranes for Hydrogen Production

et al. 2020

View full text Add to dashboard Cite

Although there are promising environmental and energy characteristics for the photocatalytic production of hydrogen, two main drawbacks must be overcome before the large- scale deployment of the technology becomes a reality, (i) the low efficiency reported by state of the art photocatalysts and, (ii) the short life time and difficult recovery of the photocatalyst, issues that need research and development for new high performance catalysts. In this work 2% rGO/TiO2 composite photocatalysts were supported over Nafion membranes and the performance of the photocatalytic membrane was tested for hydrogen production from a 20% vol. methanol solution. Immobilization of the composite on Nafion membranes followed three different simple methods which preserve the photocatalyst structure: solvent-casting (SC), spraying (SP), and dip-coating (DP). The photocatalyst was included in the matrix membrane using the SC method, while it was located on the membrane surface in the SP and DP membranes showing less mass transfer limitations. The performance of the synthesized photocatalytic membranes for hydrogen production under UVA light irradiation was compared. Leaching of the catalytic membranes was tested by measuring the turbidity of the solution. With respect to catalyst leaching, both the SC and SP membranes provided very good results, the leaching being lower with the SC membrane. The best results in terms of initial hydrogen production rate (HPR) were obtained with the SP and DP membrane. The SP was selected as the most suitable method for photocatalytic hydrogen production due to the high HPR and the negligible photocatalyst leaching. Moreover, the stability of this membrane was studied for longer operation times. This work helps to improve the knowledge on the application of photocatalytic membranes for hydrogen production and contributes in facilitating the large-scale application of this process.

show abstract

“…Although TiO2-mediated photocatalysis is the subject of a very large number of research studies, it is difficult to find a comprehensive account addressing a large number of pollutants: in general, only one model reactant is considered, which is not necessarily representative of the actual photocatalytic efficiency of the material against other pollutants. Moreover, while several immobilization methods have been proposed to produce stable photocatalytic coatings for water purification [43][44][45], in gas phase photocatalysis the catalyst nanoparticles are generally spread on a suitable support, or alternatively produced by sol-gel and applied by spraying or dipping [45][46][47][48]. This poses some questions on the actual stability of the coating and on the potential dispersion of nanoparticles in the treated air effluent, with related health concerns, and opens the way to scientific research on reliable and efficient methods of catalyst immobilization.…”

Section: Introductionmentioning

confidence: 99%

Absorption and photocatalytic degradation of VOCs by perfluorinated ionomeric coating with TiO2 nanopowders for air purification

Sansotera

Kheyli

Baggioli

et al. 2019

Chemical Engineering Journal

View full text Add to dashboard Cite

In this work, we propose a transparent multilayered perfluoropolymeric coating as immobilization method for TiO2 nanoparticles, and evaluate its suitability in the gas phase photocatalytic degradation of six different volatile organic compounds. The coating was made of a layer of TiO2containing perfluorosulfonic acid polymer on a layer of perfluorinated amorphous polymer. The chemical stability of perfluoropolymeric materials to UV radiation and UV-activated TiO2 overcomes the possible degradation of the polymeric immobilization system which is typical of more traditional polymeric coatings. Moreover, the TiO2-containing ionomeric perfluorosulfonic layer worked as selective membrane for pollutants absorption and catalyst preservation, depending on the interactions between the superacidic polar heads of the ionomer and the pollutants, in particular those capable of hydrogen bonding. Gas-phase photocatalytic degradation tests were performed using pentane, methanol, 2-propanol, toluene, dichloromethane and pyridine as reference volatile organic pollutants, thus ranging on different polarity properties. Results indicate performances comparable to other approaches reported in the literature and show a strong influence of both atmospheric conditions (namely, humidity) and pollutant nature-polarity, proticity-on the actual kinetics of photodegradation, also depending on the interactions regulating the affinity between the ionomeric layer of the coating and pollutants. The high potential of the coating in the photodegradation was confirmed by the observed values of the photoabatement rates: all approximatively above 10-5 s-1 and maximum for alcohols (1.4 × 10-4 and 1.7 × 10-4 s-1 in dry and humid conditions, respectively).

show abstract

Immobilized particle coating for optimum photon and TiO 2 utilization in scaled air treatment photo reactors

Cited by 32 publications

References 47 publications

Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses

Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses

Performance of rGO/TiO2 Photocatalytic Membranes for Hydrogen Production

Absorption and photocatalytic degradation of VOCs by perfluorinated ionomeric coating with TiO2 nanopowders for air purification

Contact Info

Product

Resources

About