fulltext.study @t Gmail

Efficiency and harmfulness of air-purifying photocatalytic commercial devices: From standardized chamber tests to nanoparticles release

Paper ID Volume ID Publish Year Pages File Format Full-Text
53847 46987 2015 6 PDF Available
Title
Efficiency and harmfulness of air-purifying photocatalytic commercial devices: From standardized chamber tests to nanoparticles release
Abstract

•French and soon European standard for commercial photocatalytic air purifiers.•Closed-chamber tests for air-purifier devices including a photocatalytic function.•Determination of the clean air delivery rate and of the extent of mineralization.•Two classes of commercial photocatalytic air-purifiers.

The aim of this study was the comparison of the efficiency of several commercial photocatalytic air-purifiers according to the French XP B44-013 AFNOR standard test (soon European) in a large closed chamber at the ppbV level under controlled conditions representative of indoor air. After inter-lab comparisons validating the method and analytical procedures, the commercial devices were evaluated for the mineralization of a mixture of four representative VOCs (acetaldehyde, acetone, n-heptane and toluene). Comparison of the degradation rate allowed the determination of the clean air delivery rate (CADR), while the mineralization efficiency was determined from CO2 analysis. The devices could be ranked in two classes: class 1 for efficient devices (high CADR, extended mineralization, no by-product) and class 2 for inefficient and unsafe ones (by-product release even in the absence of VOCs, low CADR and mineralization). Electrical low pressure impactor (ELPI) could not evidence any nanoparticles release with any of the studied devices. Formaldehyde was the main by-product detected in all cases, but the concentration remained low and decreased with time due to its total mineralization with class 1 devices. For class 2 devices, formaldehyde concentration was higher and went on increasing with time.These experimental data point out the urgent need of careful evaluation and certification of commercial photocatalytic air-purifiers for consumer's safety and secure development of the technology.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (197 K)Download as PowerPoint slide

Keywords
Photocatalysis; Volatile organic compounds (VOCs); Standard; Air purifiers; Mineralization; Nanoparticles
First Page Preview
Efficiency and harmfulness of air-purifying photocatalytic commercial devices: From standardized chamber tests to nanoparticles release
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 252, 1 September 2015, Pages 35–40
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us