Two-stage uv-photocatalytic air purification system for VOC and pathogen removal
An advanced two-stage air purification technology combining Cu-doped TiO2 photocatalytic oxidation with activated carbon adsorption. Designed for HVAC integration, it removes volatile organic compounds and airborne pathogens while eliminating harmful oxidation byproducts such as formaldehyde and acetaldehyde.
Overview
This solution addresses critical limitations in existing UV-photocatalytic air purification technologies used in HVAC systems. Conventional flow-through photocatalytic oxidation systems suffer from inconsistent performance under varying operational conditions and generate toxic byproducts, including formaldehyde and acetaldehyde, during the oxidation process. The proposed two-stage filtration-cum-adsorption methodology overcomes these challenges by combining batch-mode photocatalytic oxidation with downstream activated carbon adsorption, delivering cleaner indoor air without harmful intermediates.
The technology targets commercial buildings, healthcare facilities, and other indoor environments where air quality directly impacts occupant health, productivity, and regulatory compliance. By integrating pathogen and VOC removal into a single compact system compatible with existing HVAC infrastructure, it offers a practical pathway to improved indoor environmental quality.
Technical specifications
Stage 1: Photocatalytic oxidation chamber
- Inner surface coated with Cu-doped TiO2 catalyst to enhance photocatalytic activity
- Equipped with a UVC light source to drive oxidation reactions
- Contains an activated-carbon impregnated HEPA filter for simultaneous particulate matter and VOC capture
- UVC light oxidizes captured microorganisms and VOCs in the presence of the catalyst
- Operates in batch mode rather than flow-through to improve treatment efficiency
Stage 2: Adsorption chamber
- Inner surface coated with activated carbon
- Captures and removes harmful byproducts generated during photocatalytic oxidation, including formaldehyde and acetaldehyde
Key parameters under investigation:
- Optimum air velocity
- Relative humidity (RH) levels
- UV light intensity requirements
- Lifespan and replacement frequency of activated carbon in Stage 2
Technology readiness level
This technology is currently at an early-to-mid stage of development. The research team has formulated a clear hypothesis and designed a two-stage experimental methodology to validate performance. Planned validation includes parametrization of critical operating conditions such as air velocity, humidity, UV intensity, and activated carbon longevity. Further experimental work is required to optimize system parameters and demonstrate consistent performance before commercial deployment. The approach builds on established photocatalytic oxidation and adsorption technologies, positioning it for relatively rapid translation once validation milestones are achieved.
About University of Illinois, Urbana-Champaign
The University of Illinois Urbana‑Champaign is a flagship public research university with large‑scale research capacity and a broad academic portfolio. An on‑campus Research Park co‑locates corporate R&D teams and startups with faculty, while the National Center for Supercomputing Applications provides advanced computing and data capabilities for collaboration. Integration with a regional health system and an engineering‑based college of medicine enables clinical translation, and a long‑standing extension network links campus innovation to partners statewide. Research is supported by competitive federal funding from NSF, NIH, DOE, USDA, and DoD. A technology transfer office streamlines IP, licensing, and startups, complemented by incubators and prototyping in the Research Park.
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