System and method of generating singlet oxygen for water purification

A photosensitizer device with a hydrophobic substrate coated with photosensitizer material generates singlet oxygen efficiently, addressing the degradation and lifetime issues of conventional methods, enabling prolonged use and effective water purification.

WO2025175074A1 Publication Date: 2025-08-21LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE +1
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Patent Information

Application Number
PCT/US2025/015890
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-02-14
Filing Date
2025-02-14
Publication Date
2025-08-21

AI Technical Summary

Technical Problem

Conventional methods for generating singlet oxygen for water purification involve dispersing photosensitizers in liquid media, leading to rapid degradation and the need for disposal after each use, and the short lifetime of singlet oxygen in the water and gas phase necessitates in-situ generation at the point of use.

Method used

A system comprising a photosensitizer device with a substrate coated with a hydrophobic photosensitizer material, where singlet oxygen is generated through photosensitization of triplet oxygen under light illumination, using a flow chamber design that maintains the photosensitizer and enhances contact area, allowing for prolonged use and efficient purification.

Benefits of technology

The system effectively generates and maintains singlet oxygen for extended periods, purifying water by oxidizing impurities and inactivating biological contaminants without degrading the photosensitizer, thus improving efficiency and reducing maintenance costs.

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Abstract

A system for generating singlet oxygen comprises a photosensitizer device comprising a substrate on the surface of which a photosensitizer material is coated, at least one light source configured to illuminate light at a wavelength to the photosensitizer device, a water stream containing dissolved oxygen by injecting oxygen gas into the water, a water inlet configured to feed the water stream to a flow chamber that contains the photosensitizer device, wherein the singlet oxygen is generated by contact of the water stream with the photosensitizer material under light illumination, simultaneously, the generated singlet oxygen purifies the water stream by oxidizing impurities and inactivates biological contaminants in the water stream, and a water outlet, configured to discharge a purified water.
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