Overview
ISO 22601:2019 specifies a laboratory test method to determine the phenol oxidative decomposition performance of semiconducting photocatalytic materials used for water purification. The standard measures photocatalytic mineralization (oxidative breakdown of phenol and its by‑products) by quantitative total organic carbon (TOC) analysis. It applies to solid test pieces (planar, spherical, flake or block shapes) where the photocatalyst is an integral or surface‑applied component. Powdery materials or specimens that elute hydrocarbons into solution are excluded.
Key topics and requirements
- Test principle: Photocatalytic mineralization of phenol to CO2 and water is monitored by measuring TOC reduction under UV irradiation compared with a dark control.
- Materials and reagents: Phenol reagent (purity > 99 wt%), distilled/deionized water, purified air, and oxygen‑saturated water as specified.
- Test specimen: Solid test pieces that retain shape during immersion and irradiation; shapes allowed include planar, spherical, flake or block. Elutable or powdery samples are excluded.
- Test apparatus:
- UV light source and radiometer (referenced to ISO 10677 for UV source requirements)
- UV‑resistant test vessel (silica glass window recommended) and chemically resistant O‑rings (e.g., fluorocarbon polymer)
- TOC analyzer (measurement and calibration per ISO 8425)
- pH meter and controlled aeration/oxygen supply
- Test conditions and procedure:
- Comparative measurements under illuminated and dark conditions
- Initial and final TOC (example: 6‑hour exposure reported in the standard) to calculate TOC decrease attributable to photocatalysis
- Pre‑treatment and handling instructions, instrument setup, and data evaluation methods (examples in informative annexes)
- Evaluation and reporting: Calculation of ΔTOC, criteria for a successful test, and required information for the test report.
Applications and users
ISO 22601:2019 is designed for:
- Materials scientists and R&D teams developing photocatalytic ceramics and surface coatings
- Manufacturers of advanced ceramics and water‑purification products incorporating photocatalysts
- Accredited testing and calibration laboratories performing photocatalysis testing, performance verification, or quality control
- Product certification bodies and environmental laboratories evaluating water treatment efficacy of photocatalytic materials
Practical applications include screening photocatalytic coatings, validating product claims for water purification, and comparing performance across materials under standardized conditions.
Related standards
- ISO 8425 - TOC/DOC determination (water quality)
- ISO 10677 - UV light sources for testing photocatalytic materials
- ISO 19722 - Photocatalytic activity by dissolved oxygen consumption
- ISO 22197‑1 - Photocatalytic air‑purification testing (NO removal)
- ISO 20507 - Vocabulary (fine ceramics)
Keywords: ISO 22601:2019, photocatalytic materials testing, TOC analysis, phenol oxidative decomposition, fine ceramics, photocatalysis testing, water purification standard.