1、BS ISO 19722:2017Fine ceramics (advancedceramics, advanced technicalceramics) Test methodfor determination ofphotocatalytic activity onsemiconducting photocatalyticmaterials by dissolved oxygenconsumptionBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 19722:20
2、17 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 19722:2017.The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics.A list of organizations represented on this committee can be obtained on request to it
3、s secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 87411 6 ICS 81.060.30 Compliance with a British Standar
4、d cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2017.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 19722:2017 ISO 2017Fine ceramics (advanced cerami
5、cs, advanced technical ceramics) Test method for determination of photocatalytic activity on semiconducting photocatalytic materials by dissolved oxygen consumptionCramiques techniques Mthode dessai relative la dtermination de lactivit photocatalytique sur matriaux photocatalytiques semiconducteurs
6、par la consommation doxygne dissousINTERNATIONAL STANDARDISO19722First edition2017-01Reference numberISO 19722:2017(E)BS ISO 19722:2017ISO 19722:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no pa
7、rt of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member b
8、ody in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 19722:2017ISO 19722:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definiti
9、ons . 14 Symbols 25 Principle 26 Materials . 36.1 Reagent 36.2 Purified water 36.3 Purified air 36.4 Purified water saturated with dissolved oxygen . 36.5 Test solution 37 Test apparatus . 37.1 General . 37.2 Ultraviolet (UV) Irradiation light source . 37.3 UV radiometer . 37.4 UV light intensity .
10、37.5 DO analyser 37.6 Magnetic stirrer and magnetic stirring bar 48 Arrangement of test method 48.1 Measuring device setup . 48.2 Test vessel and implement 49 Test material . 49.1 Powder test sample . 49.2 Film test piece 410 Procedure of the measurement 510.1 Test temperature . 510.2 Preparation of
11、 water 510.3 Powder test sample . 510.3.1 Preparation of suspension from powder test sample 510.3.2 Procedure of the measurement . 510.4 Film test piece 510.4.1 Preparation of film test piece 510.4.2 Procedure of the measurement . 610.5 Blank POD(%) 611 Evaluation of results . 611.1 General . 611.2
12、Evaluation of POD . 612 Test report . 7Annex A (informative) Example of suitable measuring device component . 8Annex B (informative) Example of suitable test vessel and implement .10Annex C (informative) Example of test position of test vessel 12Annex D (informative) Example of a data evaluation .13
13、Annex E (informative) Results of the interlaboratory test .16Bibliography .17 ISO 2017 All rights reserved iiiContents PageBS ISO 19722:2017ISO 19722:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). Th
14、e 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-gov
15、ernmental, 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 i
16、n 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 p
17、ossibility 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 lis
18、t of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well
19、as information about ISOs 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 2017 All rights reservedBS ISO 19722:2
20、017ISO 19722:2017(E)IntroductionInternational Standards covering test methods for determination of photocatalytic activity have been published. A wide variety of photocatalytic functions, such as water and air purification, antibacterial effect, and self-cleaning, require different evaluation method
21、s. However, much easier methods to evaluate a common semiconducting photocatalytic activity are strongly demanded, in particular in research and development activities for testing of performance of semiconducting photocatalyst and photocatalytic materials under development. ISO 2017 All rights reser
22、ved vBS ISO 19722:2017BS ISO 19722:2017Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for determination of photocatalytic activity on semiconducting photocatalytic materials by dissolved oxygen consumption1 ScopeThis document specifies the test method for determination of
23、 concentration of dissolved oxygen consumed due to photocatalytic oxidation of phenol in aqueous phase by semiconducting photocatalytic substances. The method is applicable to powder test sample or film test piece of semiconducting photocatalystic material targeting water contaminants. This test met
24、hod is not applicable for evaluating the materials conjugated with other base material, such as organic binder which can also be decomposed by the photocatalytic activity.This document is applicable to the test method for the activity of powder test sample or film test piece of semiconducting photoc
25、atalystic material targeting water contaminants.2 Normative referencesThe 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 lates
26、t edition of the referenced document (including any amendments) applies.ISO 5814, Water quality Determination of dissolved oxygen Electrochemical probe methodISO 10677, Fine ceramics (advanced ceramics, advanced technical ceramics) Ultraviolet light source for testing semiconducting photocatalytic m
27、aterialsISO/IEC 17025, General requirements for the competence of testing and calibration laboratories3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 20507 and the following apply.ISO and IEC maintain terminological databases for use in standardizatio
28、n at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp3.1semiconducting photocatalystsubstance that displays photocatalytic action based on its electronic band structureNote 1 to entry: This applies to
29、 metal oxides like titanium dioxide and sulfides. Photocatalysts which are not semiconducting includes metal complexes.3.2photocatalytic materialsmaterial in which or on which the photocatalyst is added by coating, impregnation, mixing, etc.Note 1 to entry: Materials include ceramic, metal, plastic,
30、 cloth, etc. for general purpose.INTERNATIONAL STANDARD ISO 19722:2017(E) ISO 2017 All rights reserved 1BS ISO 19722:2017ISO 19722:2017(E)3.3DOdissolved molecular oxygen in aqueous phase3.4DO analysermeasuring instrument for continuous measurement of DO (3.3) in aqueous using DO electrode (3.5)3.5DO
31、 electrodeelectrode to measure DO (3.3) in aqueous phase3.6photocatalytic oxygen demandPODquantity of molecular oxygen in aqueous phase consumed in photocatalysis3.7blank POD(%)percentage of concentration of DO (3.3) consumed under a test condition without phenol addition4 SymbolsDesignation Symbol
32、Unitroom temperature R.T. Cwater temperature W.T. Cconcentration c mol/lconcentration of DO cDOmg/lphotocatalytic oxygen demand POD mg/lcDObefore UV light irradiation in the dark ciDOmg/lcDOafter UV light irradiation in the dark cfDOmg/lvolume of test solution V mlwavelength nmUV light irradiation i
33、ntensity I mW/c m25 PrinciplePhotocatalysis in pure water generally produces molecular oxygen(O2) from water molecule (H2O) oxidation3. In the water polluted by some of the organic compounds, major photocatalysis oxidizes the organic compounds4. Photocatalyst needs O2to oxidize organic compounds to
34、CO2and water in the environment4. Then the quantity of O2that photocatalysis needs is much larger than O2production from H2O oxidation because the organic compound is photocatalytically oxidized much easier than water molecule. O2then has major three functions in semiconducting photocatalyst. The fi
35、rst function is to improve charge separation by accepting conduction band electron. The second one is to produce active oxygen species that have the ability to oxidize organic compounds. The final one is oxidation. O2combines with organic radicals (intermediates) produced by semiconducting photocata
36、lytic oxidation; O2is an indispensable species in the semiconducting photocatalysis4. Therefore, the photocatalysis to oxidize organic compound means O2consumption. In the photocatalysis to oxidize and mineralize the organic compounds, partially oxygenated by-products are produced. Under the progres
37、s in the continuous oxidation of partially oxygenated by-products, the photocatalysis consume O2to mineralisation. On the basis of the photocatalytic mineralization and functions of O2, the semiconducting photocatalytic activity can be evaluated by determining O2consumption. This test method is espe
38、cially effective in the photocatalysis in aqueous phase. Target photocatalytic materials are either powder test samples or a film test pieces.2 ISO 2017 All rights reservedBS ISO 19722:2017ISO 19722:2017(E)6 Materials6.1 ReagentReagent is phenol and the assay is 99 wt%.6.2 Purified waterWater used f
39、or the preparation of all solutions shall be distilled or deionised water.6.3 Purified airAir in the atmosphere aerated through 1 000 ml purified water.6.4 Purified water saturated with dissolved oxygenPurified water at R.T. 1 C saturated with DO.6.5 Test solutionSuspension with the powder test samp
40、le in phenol solution or phenol solution for the film test piece.7 Test apparatus7.1 GeneralApparatus shall be used to evaluate the semiconducting photocatalytic materials with a suitable test method. The powder test sample is suspended and the film test piece is immersed in the test solution. The f
41、ollowing apparatus is required.7.2 Ultraviolet (UV) Irradiation light sourceUse black light fluorescence lamps as black light lamp (BL) and black light blue lamps (BLB). The black light fluorescence lamps shall have a peak wavelength = 351 nm as specified in ISO 10677.7.3 UV radiometerA radiometer w
42、ith a detector whose sensitivity peak is at = 351 nm shall be used to measure the UV-light intensity. The radiometer shall be calibrated to closely match the characteristic of the UV light irradiation light source as specified in ISO 10677 or be corrected to ascertain sensitivity within the waveleng
43、th range to be adsorbed by the powder test sample or the film test piece with suitable approaches.7.4 UV light intensityI is adjusted to be 1,5 mW/cm2at the centre of a test vessel for the powder test sample or at the centre of the film test piece surface for the film test piece (see Annex C).7.5 DO
44、 analyserTo measure cDO, an electrode of DO analyser has an oxygen permeable membrane and the performance of electrode and equipment is specified in ISO 5814. Sensitivity correction and operation of the electrode and the DO analyser shall be performed following their manuals of suppliers and manufac
45、tures. Notice that portable equipment does not have stability for voltage, if indicated values are unstable, it is necessary to use stabilised power supplies. ISO 2017 All rights reserved 3BS ISO 19722:2017ISO 19722:2017(E)7.6 Magnetic stirrer and magnetic stirring barA rotational number for stirrin
46、g is 1 400 r/min to 2 100 r/min. The size of a magnetic stirring bar is approximately o.d. 7 mm L 20 mm which is adjusted to be the size of the test vessel. Digital laser tachometers (non-contact system) are suitable for measurement of a rotational number. The rotational number is measured in the ai
47、r.8 Arrangement of test method8.1 Measuring device setupThe apparatus shall be used to evaluate the activity of photocatalytic materials by measuring a decrease in cDOin the test solution with photo irradiation necessary for the photocatalytic reaction after suspending the powder test sample or imme
48、rsing the film test piece in the test solution, consisting of the test vessel, the light source, the DO analyser, a thermostatic bath, and a pump. This test is in a closed system to measure the decrease in cDOin the test solution. An example of the measuring device setup is shown in Annex A.8.2 Test
49、 vessel and implementSchematic diagrams are shown in Annex B. The test vessel and glass implement shall be made of borosilicate glass which can resist near-UV light irradiation of 300 nm and absorbs less UV. The test vessel for the test solution shall be cylindrical and the volume shall be 200 ml.The test solution temperature has to be kept within a certain definite range during the test. A water jacket in which water can circulate at a constant temperature shall be used and a test vessel holder (upper an
