ISO 22197-5:2021
Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for air-purification performance of semiconducting photocatalytic materials — Part 5: Removal of methyl mercaptan
Fine ceramics (advanced ceramics, advanced technical ceramics) — Test method for air-purification performance of semiconducting photocatalytic materials — Part 5: Removal of methyl mercaptan
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 11
- Дата публикации:
- 5 июля 2021 г.
- Издание:
- ISO IS 22197 edition 2 version 1
- ICS:
- 81.060.30
This document specifies a test method for the determination of the air-purification performance of materials that contain a photocatalyst or have photocatalytic films on the surface, usually made from semiconducting metal oxides, such as titanium dioxide or other ceramic materials, by continuous exposure of a test piece to the model air pollutant under irradiation with long-wave ultraviolet (UV) light. This document 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 document 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 document does not apply to powder or granular photocatalytic materials. This test method 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 the removal of methyl mercaptan.
Abstract
Overview - ISO 22197-5:2021 (air‑purification test for methyl mercaptan)
ISO 22197-5:2021 is part of the ISO 22197 series for fine ceramics (advanced/technical ceramics). It defines a laboratory test method to determine the air‑purification performance of semiconducting photocatalytic materials against methyl mercaptan (methanethiol, CH3SH) under long‑wave UV irradiation. The standard covers flat construction materials, structured filter materials (honeycomb, woven/non‑woven), and polymer/composite substrates that contain ceramic photocatalyst phases. It does not apply to powder or granular photocatalytic materials.
Key topics and technical requirements
- Test principle: continuous flow photoreactor exposes a standardized test piece to a model polluted air stream while irradiated (300–400 nm) to activate photocatalysis. Net removal of methyl mercaptan is quantified after accounting for dark adsorption/desorption.
- Photoreactor & sample geometry: test pieces are positioned with a controlled air gap (5.0 mm ± 0.5 mm) to an optical window; typical flat specimen dimensions are specified in the test geometry.
- Light source and irradiance: UV source meeting ISO 10677 (e.g., BL/BLB lamps) with uniform irradiance across the sample. Target irradiance at the sample surface: 10 W/m² (300–400 nm) ± 0.5 W/m².
- Gas supply & analysis: controlled test gas supply system with mass‑flow controllers, humidifier and certified standard gas (methyl mercaptan). Gas flow is expressed at standard state (0 °C, 101.3 kPa). Low‑concentration pollutant measurement requires low‑adsorption reactor materials and sensitive analysers.
- Safety & procedure controls: testing recommended inside a fume hood with scrubber due to the strong odor and hazard of methyl mercaptan. Dark‑condition tests evaluate non‑photocatalytic adsorption; details for pretreatment and contaminant removal procedures are included.
- Test reporting and validity: procedures for calculation of removal quantity/percentage, acceptance criteria for adsorption, and guidance for low‑performance samples are specified.
Practical applications and who uses it
- Photocatalytic ceramic and coated‑material manufacturers validating air‑purification performance against malodorous sulfur compounds.
- Independent and accredited test laboratories (ISO/IEC 17025) performing product certification and R&D.
- Building material specifiers, HVAC/filter designers and environmental engineers assessing odor control performance of façade materials, indoor panels and filters.
- Researchers comparing photocatalytic formulations (e.g., TiO2‑based coatings) for removal of gaseous thiols.
Related standards
- ISO 22197 series (other gas removal test methods, e.g., NO removal)
- ISO 10677 (UV light source specification for photocatalyst testing)
- ISO/IEC 17025 (laboratory competence and calibration)
Keywords: ISO 22197-5, photocatalytic materials, air‑purification performance, methyl mercaptan, fine ceramics, titanium dioxide, photoreactor, UV irradiation, test method.
Технические детали
- Технический комитет
- ISO/TC 206 - Fine ceramics
- SKU
- ISO 22197-5:2021
Похожие стандарты
Стандарты, упомянутые в описании