1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 22197-2:2011Fine ceramics (advancedceramics, advanced technicalceramics) Test method forair-purification performance ofsemiconducting photocatalyticmaterialsPart 2: Remova
2、l of acetaldehydeBS ISO 22197-2:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 22197-2:2011.The UK participation in its preparation was entrusted to TechnicalCommittee RPI/13, Advanced technical ceramics.A list of organizations represented on this committ
3、ee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 62882 5ICS 81.060.30Compliance with a British Standard cannot confer immunity fromlegal oblig
4、ations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2011.Amendments issued since publicationDate Text affectedBS ISO 22197-2:2011Reference numberISO 22197-2:2011(E)ISO 2011INTERNATIONAL STANDARD ISO22197-2First edition2011-04-01Fin
5、e ceramics (advanced ceramics, advanced technical ceramics) Test method for air-purification performance of semiconducting photocatalytic materials Part 2: Removal of acetaldehyde Cramiques techniques Mthodes dessai relatives la performance des matriaux photocatalytiques semi-conducteurs pour la pur
6、ification de lair Partie 2: limination de lactaldhyde BS ISO 22197-2:2011ISO 22197-2:2011(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are
7、 licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details
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9、ting to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including pho
10、tocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Sw
11、itzerland ii ISO 2011 All rights reservedBS ISO 22197-2:2011ISO 22197-2:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Symbols3 5 Principle .3 6 Apparatus.3 6.1 Test equipment3 6.2 Test gas supply .4 6.3 Photoreactor 5
12、6.4 Light source .6 6.5 Analytical system for acetaldehyde 6 6.6 Analytical system for CO27 7 Test piece .7 8 Procedure.7 8.1 General aspects.7 8.2 Pretreatment of test piece 8 8.3 Preparation for the test.8 8.4 Pretest.8 8.5 Test of acetaldehyde removal and CO2conversion8 8.6 Test of acetaldehyde r
13、emoval (when the CO2concentration cannot be measured) .9 9 Calculation .10 9.1 Calculation method .10 9.2 Removal percentage and removed quantity of acetaldehyde 10 9.3 Conversion to CO211 10 Test method for test pieces with lower performance11 11 Test report12 Annex A (informative) Results of round
14、-robin test .13 Bibliography14 BS ISO 22197-2:2011ISO 22197-2:2011(E) iv ISO 2011 All rights reservedForeword 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
15、 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 w
16、ork. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare Int
17、ernational Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of
18、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. ISO 22197-2 was prepared by Technical Committee ISO/TC 206, Fine ceramics. ISO 22197 consists of the following parts, under the general title Fine ceram
19、ics (advanced ceramics, advanced technical ceramics) Test method for air-purification performance of semiconducting photocatalytic materials: Part 1: Removal of nitric oxide Part 2: Removal of acetaldehyde Part 3: Removal of toluene Part 4: Removal of formaldehyde Part 5: Removal of methyl mercaptan
20、 BS ISO 22197-2:2011INTERNATIONAL STANDARD ISO 22197-2:2011(E) ISO 2011 All rights reserved 1Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for air-purification performance of semiconducting photocatalytic materials Part 2: Removal of acetaldehyde 1 Scope This part of ISO
21、 22197 specifies a test method for the determination of the air-purification performance of materials that contain a photocatalyst or have photocatalytic films, usually made from semiconducting metal oxides, such as titanium dioxide or other ceramic materials, by continuous exposure of a test piece
22、to the model air pollutant under illumination with ultraviolet light (UV-A). This part of ISO 22197 is intended for use with different kinds of materials, such as construction materials in flat sheet, board or plate shape, that are the basic forms of materials for various applications. This part of
23、ISO 22197 also applies to structured filter materials including honeycomb-form, woven and non-woven fabrics, and to plastic or paper materials if they contain ceramic microcrystals and composites. This part of ISO 22197 does not apply to powder or granular photocatalytic materials. This test method
24、is usually applicable to photocatalytic materials produced for air purification. 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. It concerns
25、the removal of acetaldehyde. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applie
26、s. ISO 80000-1:2009, Quantities and units Part 1: General ISO 2718:1974, Standard layout for a method of chemical analysis by gas chromatography ISO 4224:2000, Ambient air Determination of carbon monoxide Non-dispersive infrared spectrometric method ISO 4677-1:1985, Atmospheres for conditioning and
27、testing Determination of relative humidity Part 1: Aspirated psychrometer method ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method ISO 6145-7:2001, Gas
28、 analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 7: Thermal mass-flow controllers BS ISO 22197-2:2011ISO 22197-2:2011(E) 2 ISO 2011 All rights reservedISO 10677:1), Fine ceramics (advanced ceramics, advanced technical ceramics) Ultraviolet light source for test
29、ing semiconducting photocatalytic materials ISO 16000-3:2001, Indoor air Part 3: Determination of formaldehyde and other carbonyl compounds Active sampling method ISO/IEC 17025:2005, General requirements for the competence of testing and calibration laboratories ISO 22197-1:2007, Fine ceramics (adva
30、nced ceramics, advanced technical ceramics) Test method for air-purification performance of semiconducting photocatalytic materials Part 1: Removal of nitric oxide 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 photocatalyst substance that p
31、erforms one or more functions based on oxidization and reduction reactions under photoirradiation, including decomposition and removal of air and water contaminants, deodorization, and antibacterial, self-cleaning and antifogging actions 3.2 photocatalytic materials materials in which or on which th
32、e photocatalyst is added by coating, impregnation, mixing, etc. NOTE Such photocatalytic materials are intended primarily for use as building and road construction materials to obtain the above-mentioned functions. 3.3 zero-calibration gas air that does not contain pollutants (i.e. in which common p
33、ollutants are below 0,01 l/l and carbon dioxide is below 0,1 l/l) NOTE The zero-calibration gas is prepared from indoor air using a laboratory air-purification system, or supplied as synthetic air in a gas cylinder. 3.4 standard gas diluted gases of known concentrations supplied in cylinders and cer
34、tified by an accredited laboratory 3.5 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. NOTE The flow rate, concentration, etc., are expressed at the standard stat
35、e (0 C, 101,3 kPa) and dry-gas basis (exclusion of water vapour). 3.6 dark condition test condition with no light illumination by the light source for testing and room lighting NOTE Usually the test gas is supplied for comparison with the illuminated reaction. 1) To be published. BS ISO 22197-2:2011
36、ISO 22197-2:2011(E) ISO 2011 All rights reserved 34 Symbols For the purposes of this document, the following symbols apply. f the air-flow rate converted into that at the standard state (0 C and 101,3 kPa, and dry-gas basis) (l/min) Athe volume fraction of acetaldehyde at the reactor exit (l/l) A0th
37、e volume fraction of acetaldehyde in the test gas (l/l) CO2the carbon dioxide (CO2) volume fraction generated by UV irradiation (l/l) CO2,Lthe CO2volume fraction at the reactor exit under UV irradiation (l/l) CO2,Dthe CO2volume fraction at the reactor exit under dark conditions (l/l) CO2,Dpostthe CO
38、2volume fraction in the dark after UV irradiation (l/l) CO2,Dprethe CO2volume fraction in the dark before UV irradiation (l/l) nAthe quantity of acetaldehyde removed by the test piece (mol) nCO2the quantity of CO2converted from acetaldehyde, in micromoles (mol) RAthe removal percentage, by test piec
39、e, of acetaldehyde (%) RCO2the conversion from acetaldehyde to CO2(%) 5 Principle This part of ISO 22197 concerns the development, comparison, quality assurance, characterization, reliability, and design data generation of photocatalytic materials (Reference 3 in the Bibliography). The method descri
40、bed is intended to obtain the air-purification performance of photocatalytic materials by exposing a test piece to model polluted air under illumination by ultraviolet (UV) light (Reference 4 in the Bibliography). Acetaldehyde (CH3CHO) is chosen as a typical volatile organic compound (VOC) with lowe
41、r molecular mass and offensive odour. The test piece, put in a flow-type photoreactor, is activated by UV illumination, and adsorbs and oxidizes gas-phase acetaldehyde to form carbon dioxide (CO2) and other oxidation products. The air-purification performance is determined from the amount of acetald
42、ehyde, in percent, adsorbed by the test piece, in micromoles (mol). The simple adsorption by the test piece (not due to photocatalysis) is evaluated by the tests in the dark. However, some test pieces adsorb acetaldehyde very strongly, and a stable concentration of acetaldehyde may not be attained i
43、n the designated time of test. The photocatalytic activity may depend on physical and chemical properties of pollutants mainly due to the adsorption process involved. For a better evaluation of air purification performance of photocatalytic materials, it is recommended to combine one or more suitabl
44、e test methods as described in other parts of ISO 22197. 6 Apparatus 6.1 Test equipment The test equipment enables a photocatalytic material to be examined for its pollutant-removal capability by supplying the test gas continuously, while providing photoirradiation to activate the photocatalyst. It
45、is the same as that used in the test method for the removal of nitric oxide (ISO 22197-1) and consists of a test gas supply, a photoreactor, a light source, and pollutant-measurement equipment. Since low concentrations of pollutants are to be tested, the system shall be constructed with materials of
46、 low adsorption and resistant to ultraviolet (UV) radiation (e.g. acrylic resin, borosilicate glass). An example of a testing system is shown in Figure 1. BS ISO 22197-2:2011ISO 22197-2:2011(E) 4 ISO 2011 All rights reservedDimensions in millimetres Key 1 light source 7 mass-flow controller 2 optica
47、l window 8 gas mixers 3 test piece 9 humidifier 4 standard gas (pollutant) 10 analyser 5 air-purification system 11 vent 6 compressor Figure 1 Schematic diagram of test equipment 6.2 Test gas supply The test gas supply provides air polluted with model contaminant at a predetermined concentration, te
48、mperature and humidity, and supplies it continuously to the photoreactor. It consists of flow regulators, a humidifier, gas mixers, etc. The flow rate of each gas should be within 5 % of the designated value, which is easily attained by using thermal mass-flow controllers with knowledge of the tempe
49、rature and gas type at calibration in accordance with ISO 6145-7. The expression of gas flow rate in this part of ISO 22197 is that converted to the standard state (0 C, 101,3 kPa, and dry-gas basis). Typical capacities of flow controller for pollutant gas, dry air and wet air are 100 ml/min, 1 000 ml/min and 1 000 ml/min, respectively. The standard acetaldehyde gas before dilution, normally balanced with nitrogen in a cylinder, shall have a volume fraction of 50
