Comparons la technologie ActivePure et PECO (oxydation photo-électrochimique)

Spend an hour researching portable air purifiers, and you'll swiftly be served ads for your search engine's favorite brands and highly-marketed products. Inundated with options from True HEPA systems to air ionizers and UV-based solutions, you may be enticed to click on the industrial design marvels that are PECO air purifiers. However, in the air purification industry, there is not a saying that rings more true than "never judge a book by its cover." While some brands may focus on sleek product packaging (the cover), other manufacturers are working endlessly to test their indoor air quality technologies (the story) for proven efficacy and safety. In this article, we'll explain how our science-backed air purification technology, ActivePure, stacks up against the trendy competition, PECO technology.

Qu'est-ce que la technologie ActivePure ?

ActivePure Technology is a revolutionary air and surface purification solution based on a concept used to scrub ethylene from the air during space travel (itself based on an earlier technological concept called photocatalytic oxidation, or PCO). ActivePure Technology shines a shielded UV light on a honeycomb matrix coated with a catalyst. Creating a reaction that turns water vapor into the following reactive oxygen species: superoxide (O2⁻), gaseous hydrogen peroxide (H2O2), the hydroxyl ion (HO⁻), and most importantly, the hydroxyl radical (HO⋅). 

These scrubbing molecules pull apart bacteria, viruses, mold spores, and volatile organic compounds in the air and reduce the aforementioned pathogens on surfaces. Unlike PCO predecessors, our proprietary perfection of technology produces these desirable reactive oxygen species without producing unintentional byproducts such as ozone¹ and VOCs². The most important fact to note here, for comparison with PECO, is that ActivePure distributes its molecules throughout the room, filling the entire space, making ActivePure an active (as opposed to passive) purification method.

What is PECO Technology (Photo-electrochemical Oxidation)?

PECO signifie oxydation photo-électrochimique. Il s'agit de la technologie exclusive d'une seule entreprise. Donnons-leur une chance en les laissant décrire cette technologie avec leurs propres mots:

"Le processus de PECO fonctionne comme la lumière excite un filtre recouvert de nanoparticules, créant une réaction chimique à la surface du filtre qui aboutit à la création de radicaux libres hydroxyle. Ces mêmes radicaux sont utilisés pour tuer les cellules cancéreuses en radiothérapie. Les radicaux libres oxydent les polluants à la surface du filtre et les convertissent en éléments inoffensifs comme des traces d'eau et de dioxyde de carbone. Grâce à une manipulation innovante du flux d'électrons, cette nouvelle technologie d'oxydation photoélectrochimique (PECO) fonctionne des ordres de grandeur plus rapidement que les processus photocatalytiques classiques. L'efficacité quantique élevée qui en résulte produit une augmentation spectaculaire de la production de radicaux hydroxyles à la surface [du] filtre, dépassant largement les limites des technologies traditionnelles d'oxydation photocatalytique (PCO)."

Ce qu'il faut retenir de cette description, c'est que le PECO est une modification lourde de la technologie PCO qui déplace le catalyseur à la surface du filtre lui-même. Il semble que le but de cette modification soit de confiner les réactions hydroxylées au filtre également, transformant la technologie active du PCO en une technologie passive.

La purification de l'air PECO est-elle efficace ?

Yes, PECO technology itself appears to be effective. Several outside organizations have tested the technology, and several medical-grade devices with PECO have even received FDA clearance as medical devices.

Toutefois, le fait que le PECO lui-même fonctionne ne signifie pas qu'il fonctionne bien dans tous les appareils dans lesquels il est déployé, notamment les appareils commercialisés pour un usage domestique. Par exemple, Consumer Reports a testé la capacité d'un purificateur domestique PECO à éliminer les particules d' une chambre d'essai. Bien que le PECO ne soit pas destiné à éliminer les particules, ce test a été utilisé pour établir la quantité d'air circulant dans l'appareil. Sur la base de résultats médiocres, l'équipe de test de Consumer Reports a estimé que le modèle de purificateur PECO qu'elle a testé ne pouvait pas traiter une pièce de plus de 100 pieds carrés ; à titre de comparaison, la taille moyenne d'un appartement d'une chambre à San Francisco est de 700 pieds carrés.

PECO's owners countered that the slower air flow can increase the "destruction efficiency," but we fail to see how this matters if microbes are not entering the chamber in the first place because of low airflow. (In fairness to the company that makes PECO, they do have test results that appear to show effectiveness in a larger space, as we shall see in the next section.)

Is PECO Technology More Effective Than ActivePure?

PECO is a passive technology because the disinfection takes place inside the reaction chamber. While this helps clean the filter, it eliminates the main advantage of photocatalytic oxidation—its ability to neutralize pathogens out in the room 24/7 rather than wait for them to pass through the device or its filter. We need active air quality technologies rather than passive air purification in a world with ever-new infectious diseases. In addition to the disadvantage of being a passive technology, ActivePure has more promising test results.

Comparing PECO Commercial Unit vs. ActivePure's Medical Guardian.

For instance, a test of a PECO unit reduced Coliphage φX174 (a common testing surrogate for more dangerous viruses) in the air by 98.7% in 24 hours. By comparison, the Aerus Medical Guardian reduced the same virus by over 99.99% in only one hour.³

For an even more startling comparison, the same laboratory (Aerosol Labs) tested both the ActivePure Medical Guardian and a PECO-based unit in two separate experiments. This lab used the same size test chamber (562 cubic feet) and the same bacteriophage (MS2 RNA virus) to test both units. After 60 minutes, the PECO unit's best log reduction (out of 4 tests) was 4.71 (or slightly under 99.999%) while the Aerus Medical Guardian's log reduction was 6.06 (or slightly over 99.9999%...below the detection limit when you factor in the standard deviation).⁴ That may not seem like a significant difference at first, but it represents over a factor of ten in the number of viral particles.

Comparing PECO's Medical Unit vs. ActivePure's Medical Guardian

You may think it is unfair of us to pit a small home unit vs. a medical grade unit, but PECO's medical-marketed offering had an even more significant performance gap. After one hour, it reduced MS2 by only 99.9477%. This performance gap may be because the experiment tested only the filters used in PECO's medical unit and not the unit itself. Further data is required to draw a proper definitive conclusion.

Comparing PECO's Commercial Unit vs. ActivePure's Pure And Clean

Let's compare our relative effectiveness at reducing the virus on everyone's mind—SARS-CoV-2—using nonmedical units only. PECO has results showing it reduces SARS-CoV-2 below the detectable limit in slightly over 2 minutes under laboratory conditions. A device with ActivePure Technology (specifically the Aerus Pure & Clean) reduces SARS-CoV-2 below the detectable limit in less than ONE minute under laboratory conditions.⁴

Our Final "Hot Take" On PECO Air Purifiers

When it comes to the air purification industry, products with technologies backed by science air often overshadowed by the trendier choice. In the case of ActivePure vs. PECO, a sleek industrial design cannot compete with ActivePure's proven, safe, and thoroughly tested air quality solutions. If you need an a purifier that gets the job, we recommend going with ActivePure.

Publié par ActivePure