Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for complete decomposition performance of semiconducting photocatalytic materials under indoor lighting environment — Decomposition of acetaldehyde

ISO 19652:2018 specifies a test method for the determination of complete decomposition performance of indoor light-active photocatalytic materials under an indoor lighting environment using acetaldehyde. In this document, photocatalytic materials are usually made from semiconducting metal oxides, such as titanium dioxide, tungsten trioxide or other ceramic materials, and they are treated in powder form. This document does not apply to film, flat sheet, board and other plate-shape materials. This method is not suitable for the determination of other performance attributes of photocatalytic materials, i.e. decomposition of water contaminants, self-cleaning, antifogging and antibacterial actions.

Céramiques fines (céramiques avancées, céramiques techniques avancées) — Méthode d’essai pour déterminer la performance de décomposition complète des matériaux photocatalytiques semi-conducteurs dans un environnement d’éclairage intérieur — Décomposition de l’acétaldéhyde

General Information

Status
Published
Publication Date
22-Mar-2018
Technical Committee
Current Stage
6060 - International Standard published
Start Date
23-Mar-2018
Completion Date
23-Mar-2018
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ISO 19652:2018 - Fine ceramics (advanced ceramics, advanced technical ceramics) -- Test method for complete decomposition performance of semiconducting photocatalytic materials under indoor lighting environment -- Decomposition of acetaldehyde
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INTERNATIONAL ISO
STANDARD 19652
First edition
2018-04
Fine ceramics (advanced ceramics,
advanced technical ceramics) — Test
method for complete decomposition
performance of semiconducting
photocatalytic materials under
indoor lighting environment —
Decomposition of acetaldehyde
Céramiques fines (céramiques avancées, céramiques techniques
avancées) — Méthode d’essai pour déterminer la performance
de décomposition complète des matériaux photocatalytiques
semi-conducteurs dans un environnement d’éclairage intérieur —
Décomposition de l’acétaldéhyde
Reference number
ISO 19652:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 19652:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2018 – All rights reserved
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ISO 19652:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 2

5 Apparatus ..................................................................................................................................................................................................................... 2

5.1 Test equipment ....................................................................................................................................................................................... 2

5.2 Photoreactor ............................................................................................................................................................................................. 3

5.3 Light source ............................................................................................................................................................................................... 3

5.4 UV cut condition .................................................................................................................................................................................... 4

5.5 Analytical system of acetaldehyde ......................................................................................................................................... 4

5.6 Analytical system for carbon dioxide .................................................................................................................................. 4

6 Test sample ................................................................................................................................................................................................................. 4

7 Procedure..................................................................................................................................................................................................................... 4

7.1 Pretreatment of test sample ........................................................................................................................................................ 4

7.2 Acetaldehyde decomposition testing ................................................................................................................................... 5

8 Calculation .................................................................................................................................................................................................................. 6

8.1 General ........................................................................................................................................................................................................... 6

8.2 Carbon dioxide concentration ................................................................................................................................................... 6

8.3 Measurement end point .................................................................................................................................................................. 6

8.4 Determination of complete decomposition ................................................................................................................... 7

8.5 Elapsed time to complete decomposition ....................................................................................................................... 9

9 Test report ................................................................................................................................................................................................................... 9

Annex A (informative) Example of test results........................................................................................................................................10

Bibliography .............................................................................................................................................................................................................................11

© ISO 2018 – All rights reserved iii
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ISO 19652:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

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For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 206, Fine ceramics.
iv © ISO 2018 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 19652:2018(E)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Test method for complete decomposition
performance of semiconducting photocatalytic materials
under indoor lighting environment — Decomposition of
acetaldehyde
1 Scope

This document specifies a test method for the determination of complete decomposition performance of

indoor light-active photocatalytic materials under an indoor lighting environment using acetaldehyde.

In this document, photocatalytic materials are usually made from semiconducting metal oxides, such

as titanium dioxide, tungsten trioxide or other ceramic materials, and they are treated in powder form.

This document does not apply to film, flat sheet, board and other plate-shape materials.

This method is not suitable for the determination of other performance attributes of photocatalytic

materials, i.e. decomposition of water contaminants, self-cleaning, antifogging and antibacterial

actions.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 4224, Ambient air — Determination of carbon monoxide — Non-dispersive infrared spectrometric method

ISO 14605, Fine ceramics (advanced ceramics, advanced technical ceramics) — Light source for testing

semiconducting photocatalytic materials used under indoor lighting environment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
photocatalyst

substance that performs one or more functions based on oxidation and reduction reactions under

photoirradiation, including decomposition and removal of air and water contaminants, deodorization,

and antibacterial, self-cleaning and antifogging actions
3.2
indoor lighting environment
environment with artificial light source for general lighting service
Note 1 to entry: Does not include sunlight.
© ISO 2018 – All rights reserved 1
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ISO 19652:2018(E)
3.3
indoor light-active photocatalytic materials

materials which perform one or more functions based on oxidation and reduction reactions under

indoor lighting environment
3.4
zero-calibration gas

air which does not contain pollutants (i.e. common pollutants are below 0,01 µl/l) or carbon dioxide

(i.e. carbon dioxide is below 1,0 µl/l.)

Note 1 to entry: The zero-calibration gas is supplied as synthetic air in a gas cylinder.

3.5
standard gas

diluted gases of known concentrations supplied in cylinders and certified by an accredited laboratory

3.6
test gas

mixture of air and pollutant(s) of known concentration prepared from a standard gas or a zero-

calibration gas, to be used for the performance test of a photocatalytic material

3.7
dark conditions

test conditions of no light illumination by the light source for testing and room lighting

3.8
complete decomposition

complete mineralization through oxidative decomposition of organic compounds by a photocatalyst,

producing carbon dioxide and water
4 Principle

This document has been established to develop, compare and evaluate the characteristics and

capabilities of practical indoor light-active photocatalysts.

This document serves as an evaluative index for complete decomposition performance for indoor light-

active photocatalytic materials under indoor light irradiation, selects acetaldehyde as the target gas for

evaluation and establishes an objective and reproducible test method.

This test entails the use of a photoreactor with a sealable structure provided with a light-transmitting

window and a gas inlet/collection port. A photocatalyst serving as a test sample is placed inside the

photoreactor, which is then sealed. First, as a pretreatment, the test sample is photoirradiated until

production of carbon dioxide ceases. After confirming that production of carbon dioxide has ceased,

air in the photoreactor is displaced by a zero-calibration gas. Acetaldehyde gas is then injected into the

reactor in a dark location until the concentration of acetaldehyde gas in the reactor reaches 100 ppm.

The reactor is left in the dark for 1 h and then irradiated with indoor light. At regular intervals, the gas

in the reactor is analysed, and the concentrations of acetaldehyde and carbon dioxide are measured.

It is considered complete decomposition when the concentration of carbon dioxide reaches a twofold

equivalent of the acetaldehyde injected, and the increase of carbon dioxide ceases simultaneously.

5 Apparatus
5.1 Test equipment

The test equipment is used to evaluate complete decomposition performance of acetaldehyde by a

test sample of a photocatalytic powder when test gas is introduced to a photoreactor in which the test

sample has been placed and sealed, then irradiated with indoor light. The test equipment consists of the

2 © ISO 2018 – All rights reserved
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ISO 19652:2018(E)

photoreactor, light source, UV-cut filter, acetaldehyde concentration measuring unit and carbon dioxide

concentration measuring unit shown below.

Since the test equipment uses air containing acetaldehyde, consideration shall be given to minimizing

adsorptive and other such losses.
5.2 Photoreactor

The photoreactor has a capacity of 500 ml ± 25 ml and a sealable structure provided with a light-

transmitting window, and is constructed from a material which adsorbs little acetaldehyde, emits no

outgas and can withstand close UV radiation. Glass is a favourable material. The light-transmitting

window shall be a quartz glass or borosilicate glass plate of low light absorption in the wavelength

range at which photoirradiation is performed. Figure 1 shows an example of a photoreactor.

Gas inlets/collection ports are provided at two or three locations on the photoreactor to collect the gas

in the reactor and for air displacement.

The airtightness of the photoreactor is important, and performing the following airtightness test

is desirable before using it in this examination. The empty photoreactor is sealed and the air inside

replaced with zero-calibration gas (carbon dioxide-free gas). It is then placed in the dark for 24 h.

Ideally, the carbon dioxide concentration inside the photoreactor 24 h later should be zero, but if it is

less than 5 ppm then the airtightness is good enough for this examination.
Key
1 elastic gasket
2 light-transmitting window
3 clamp holder
4 gas inlet
5 flat dish
6 photoreactor
7 rubber plug
Figure 1 — Example of a sealed photoreactor equipped with a glass window
5.3 Light source

Test samples shall be irradiated uniformly through a UV cut filter and the photoreactor window using

a cool white halophosphate fluorescent lamp from among those specified by ISO 14605. The distance

from the lamp to the photoreactor is also adjusted such that illuminance on the test sample surface is

10 000 lx. The irradiance shall be measured in illuminance (lx) by using an illuminanc

...

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