System and method for air purification using an enhanced multi-functional coating based on in-situ photocatalytic oxidation and ozonation
AssigneesNano and Advanced Materials Institute Limited, SAS Institute Inc.
InventorsWing Kei Ho, Jian Hui Huang
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Abstract
A system for air purification based on in-situ photocatalytic oxidation and ozonation includes a single multi-functional Ti02-based coating having photocatalytic activity for oxidation in the presence of a sufficient ozone supply and UV irradiation to synergistically oxidize gaseous pollutants at ambient conditions. Also disclosed is a method for removing gaseous pollutants using ozone and UV irradiation to simultaneously activate the photocatalytic oxidation in the presence of the Ti02-based coating to remove up to about 84% of the gaseous pollutants within 5 minutes.
Claims16
A system for removing particulates and gaseous pollutants of an airflow comprising:
- a first filter for removing large suspended particles from said airflow to create a first filtered gas;
- a mixer chamber for mixing the first filtered gas with ozone gas to create an ozone-enriched first filtered gas;
- an ozone generator for providing said ozone gas to said mixer chamber;
- a second filter incorporating a single multi-functional TiO2-based coating;
- and
- a UV generator for generating UV in the presence at said second filter incorporating the TiO2-based coating,
- wherein the placement of the mixer chamber, the UV generator, and the TiO2-based coating is configured to expose the ozone-enriched first filtered gas to the simultaneous effects of the multi-functional TiO2-based coating and UV light generated by the UV generator, and wherein said UV generator is selected from UV lamp or UV LED to emit the UV light at a wavelength of 320 nm to 400 nm, and wherein said ozone and UV light act synergistically at said second filter in the presence of said multi-functional TiO2-based coating including a plurality of mesoporous structures which are in contact with said ozone-enriched first filtered gases in order to oxidize about 82% to about 84% of said gaseous pollutants into harmless gases within 5 minutes.
A method for removing particulates and gaseous pollutants of an airflow comprising:
- collecting said airflow from an indoor environment or from an external source to create a collected gas;
- filtering the collected gas by a first filter to remove large suspended particles to create a first filtered gas;
- mixing the first filtered gases with ozone generated from an ozone generator to create an ozone-enriched first filtered gas;
- oxidizing the ozone-enriched first filtered gas by a second filter incorporating a multi-functional TiO2-based coating and a UV source at a wavelength of 320 nm to 400 nm;
- eliminating excess ozone after said oxidizing at said second filter to create a purified gases;
- and
- exhausting the purified gases back to said indoor environment or to where said airflow comes from or to the atmosphere,
- wherein said oxidizing is a result of said ozone and UV light generated by said UV source acting synergistically in the presence of said multi-functional TiO2-based coating to reduce the level of said gaseous pollutants by about 82% to about 84% within 5 minutes.
Dependencies are inferred from the claim text.