Photocatalytic Filter Medium with Conductive Polymer Coating
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Solution Overview
Problem
Current photocatalytic filter media, particularly those using titanium dioxide nanoparticles, face limitations such as high electron-hole recombination rates, limited absorption of non-polar organic pollutants, and the need for ultraviolet light for activation, which reduces their efficiency in air and water purification.
Innovation Solution
A filter medium comprising nanofibers doped with photocatalytic nanoparticles or coated with a photocatalytic film, integrated with a light energy source that radiates UV or visible light, enhancing the interaction between photocatalysts and target molecules, and utilizing a 3D lattice structure for improved mass transfer and light scattering, thereby increasing photocatalytic activity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If titanium dioxide nanoparticles are used as photocatalysts, then photocatalytic activity is achieved, but electron-hole recombination rates are high reducing efficiency
Solution Approach 1:
The patent introduces a conductive polymer coating on TiO2 nanoparticles that acts as an intermediary charge transfer mediator. This coating facilitates electron transport from TiO2 to the photocatalytic active sites while preventing direct electron-hole recombination, thereby maintaining high photocatalytic activity with reduced energy loss.
Solution Approach 2:
The patent creates a composite structure combining TiO2 nanoparticles with conductive polymer materials. This composite approach leverages the high photocatalytic activity of TiO2 while the conductive polymer component provides efficient charge separation and transport pathways, resolving the recombination issue.
2Use of energy by moving object
If titanium dioxide is used for photocatalysis, then UV light absorption is achieved, but visible light absorption is limited
Solution Approach 1:
The patent modifies the optical parameters of TiO2 by coating with conductive polymers that have different band gap structures. This changes the light absorption characteristics from UV-only to include visible light ranges, expanding the energy utilization spectrum while maintaining photocatalytic functionality.
3Productivity
If titanium dioxide nanoparticles are used, then photocatalytic performance is improved, but absorption ability for non-polar organic pollutants is low
Solution Approach 1:
The patent applies conductive polymer coatings with specific local properties on TiO2 nanoparticle surfaces. These coatings create localized regions with enhanced affinity for non-polar organic pollutants, allowing the material to maintain its photocatalytic performance while gaining improved pollutant absorption capabilities.
4Weight of moving object
If photocatalytic filter medium is made compact, then portability is improved, but light scattering and mass transfer may be reduced
Solution Approach 1:
The patent employs porous structures in the photocatalytic filter medium that maintain high surface area and light scattering capacity within a compact form factor. The porous architecture allows efficient mass transfer of pollutants while keeping the overall device lightweight and portable.
Solution Approach 2:
The patent optimizes the spatial arrangement of photocatalytic materials by creating three-dimensional porous networks that maximize light scattering paths and mass transfer surfaces within a minimal volume, achieving both compactness and high productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves high energy efficiency, compactness, and portability, with enhanced photocatalytic performance by optimizing the interaction between photocatalysts, light, and pollutants, allowing effective decomposition of organic and inorganic contaminants in both air and water using either UV or visible light.
Implementation Method 1
uses incident irradiation in the UV or visible region of the spectrum for a charge transfer mechanism. On irradiation of light, an absorption of photon takes place in the semiconductor material and excites an electron from the valence band to the conduction band
Implementation Method 2
A filter medium comprising semiconductor photocatalytic material such as nanofibers loaded or doped with photocatalysts in form of nanoparticles uses incident irradiation in the UV or visible region of the spectrum for a charge transfer mechanism
Implementation Method 3
integrated with a light energy source that radiates UV or visible light
Implementation Method 4
utilizing a 3D lattice structure for improved mass transfer and light scattering
Data Source
AI summary
The present invention relates to a filter medium (10) for air and/or water cleaning, comprising a semiconductor photocatalytic material (14) and a light energy source (15) for radiating light provided to activate photocatalytic reactions of the semiconductor photocatalytic material (14). The light energy source (15) is configured as a support (16) for the semiconductor photocatalytic material (14). The filter medium (10) can be incorporated into a filter unit (100).