Key parameters influencing the performance of photocatalytic oxidation (PCO) air purification under realistic indoor conditions

Destaillats, Hugo; Sleiman, Mohamad; Sullivan, Douglas P.; Jacquiod, Catherine; Sablayrolles, Jean; Molins, Laurent

doi:10.1016/j.apcatb.2012.03.014

Cited by 114 publications

(79 citation statements)

References 25 publications

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“…Here also no chloroacetone was detected. It is expected that the degradation process of a compound is not a one-step procedure but occurs as a chain of several degradation steps (Destaillats et al 2012;Maudhuit et al 2011;Mo et al 2009a). Those steps occur in the adsorbed phase on the surface of the catalyst-the degradation product cannot be detected in the gas phase.…”

Section: By-productsmentioning

confidence: 98%

Portable photocatalytic air cleaners: efficiencies and by-product generation

Gunschera

Markewitz

Bansen

et al. 2015

Environ Sci Pollut Res

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Portable photocatalytic air cleaners were investigated in 24 and 48 m(3) emission test chambers with regard to efficiency and by-product generation. For this purpose, formaldehyde, decane, 1,2-dichlorobenzene, toluene, α-pinene and heptanal were doped at sub-ppm concentration levels into the chambers individually and in mixtures. By way of specified test protocols, efficiencies could be distinguished but were strongly dependant on the choice of test compounds, especially on whether single or multi compound dosing was used, and on long-term effects. Initial clean air delivery rates (CADRs) up to 137 m(3)/h were measured. Typical by-products were found in significant concentrations. The main ones were formaldehyde up to 50 ppb (62 μg/m(3)) and acetone up to 80 ppb (190 μg/m(3)). Other aldehydes were also found, but at smaller levels. The detection of chloroacetone, a strong irritating compound, at concentrations up to 15 ppb (57 μg/m(3)) strengthens the importance of such investigations especially in cases were chloro-organic compounds are involved.

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Section: By-productsmentioning

confidence: 98%

Portable photocatalytic air cleaners: efficiencies and by-product generation

Gunschera

Markewitz

Bansen

et al. 2015

Environ Sci Pollut Res

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show abstract

“…The photo-oxidation of VOCs leads to partial mineralization (i.e., conversion to CO 2 , water and other inorganic species) and also produces partially oxidized byproducts. Volatile byproducts can be released as secondary pollutants [20] and non-volatile byproducts remain attached to the surface of the catalyst, leading to partial deactivation [21]. The relative effectiveness of carbon media vs UVPCO is debatable, though both approaches provide considerably more air scrubbing capacity compared to standard carbon-impregnated filters.…”

Section: Chemical Air Filtration and The Role Of Vocsmentioning

confidence: 99%

Air quality in the assisted reproduction laboratory: a mini-review

Morbeck

2015

J Assist Reprod Genet

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Quality of air in the clinical embryology laboratory is considered critical for high in vitro fertilization (IVF) success rates, yet evidence for best practices is lacking. Predominantly anecdotal reports on relationships between air quality and IVF success rates have resulted in minimal authentic clinical laboratory guidelines or in recommendations that are based on industrial cleanroom particulate standards with little attention to chemical air filtration. As a result, a nascent industry of costly, specialized air handling equipment for IVF laboratories has emerged to provide air quality solutions that have not been clearly assessed or verified. Clinics are embracing such technology because their embryology laboratories have become epicenters of assisted reproductive technology as the practice of IVF has moved to blastocyst transfers and utilization of trophectoderm biopsy for preimplantation genetic testing (PGT). Thus, a laboratory's ability to culture, biopsy, and freeze blastocysts is a rate-limiting step that depends on technical proficiency and a supportive and stable culture environment based on a foundation of high-quality ambient air. This review aims to describe how evidence for the importance of air quality, in particular the role of volatile organic compounds (VOC), has resulted in an evolution of clinical practice that has arguably contributed to improved outcomes.

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“…Ultra-violet photo-catalytic oxidation air cleaning systems share this problem (Hodgson, Destaillats et al 2007) and many ultra-violet photo-catalytic oxidation air cleaners are available as commercial products. Improving the engineering of photo-catalytic oxidation air cleaners by incorporating more catalyst and increasing the residence time for VOC contact with the catalyst has improved the VOC and formaldehyde removal efficiency, resulting in a net formaldehyde removal in some cases (Destaillats, Sleiman et al 2012).…”

Section: Chapter 4: Discussionmentioning

confidence: 99%

Integrated Technology Air Cleaners (ITAC): Design and Evaluation

Fisk¹

2013

Self Cite

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The primary objective of this project was to design, build, and test an air cleaner for residential use with the potential to substantially improve indoor air quality, or maintain indoor air quality unchanged, when outdoor air ventilation rates are reduced to save energy. Two air cleaners were designed and fabricated. The design targets for airflow rate, fan power, and projected cost were met. In short term laboratory studies, both units performed as expected; however, during field studies in homes, the formaldehyde removal performance of the air cleaners was much lower than expected. In subsequent laboratory studies, incomplete decomposition of some indoor air volatile organic compounds, with formaldehyde as a product of partial decomposition of volatile organic compounds, was confirmed as the explanation for the poor formaldehyde removal performance in the field studies. The amount of formaldehyde produced per unit of decomposition of other volatile organic compounds was substantially diminished by increasing the amount of catalyst on the filter and also by decreasing the air velocity. Together, these two measures reduced formaldehyde production, per unit destruction of other volatile organic compounds, by a factor of four, while increasing the removal efficiency of volatile organic compounds by a factor of 1.4. A company with a southern California office is conducting studies in conjunction with Lawrence Berkeley National Laboratory, with the goal of incorporating the ITAC catalytic air cleaning technology in their future commercial products.

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Key parameters influencing the performance of photocatalytic oxidation (PCO) air purification under realistic indoor conditions

Cited by 114 publications

References 25 publications

Portable photocatalytic air cleaners: efficiencies and by-product generation

Portable photocatalytic air cleaners: efficiencies and by-product generation

Air quality in the assisted reproduction laboratory: a mini-review

Integrated Technology Air Cleaners (ITAC): Design and Evaluation

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