Porous Nanofiber Heterostructure Photocatalytic Filter Screen
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Solution Overview
Problem
Traditional photocatalytic air purification systems face limitations due to low photocatalytic quantum efficiency, limited solar spectral response, poor compatibility with filter screen structures, and high costs, leading to inefficient pollutant adsorption and short service life.
Innovation Solution
A porous nano-fiber heterostructure photocatalysis filter screen based on a hot electron mechanism is developed, combining plasmonic metal nanostructures with tunable visible to infrared spectra and semiconductor nanostructures, utilizing electrospinning technology to create a high-surface-area filter screen with enhanced light transmittance and air permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional photocatalytic materials (titanium dioxide, zinc oxide) are used, then chemical stability and environmental friendliness are improved, but photocatalytic quantum efficiency deteriorates (extremely low, about 1%)
Solution Approach 1:
The patent combines traditional semiconductor photocatalytic materials (titanium dioxide, zinc oxide) with electrospun polymer fiber substrates to create a composite filter screen structure. The polymer substrate provides high surface area and mechanical stability, while the semiconductor nanoparticles provide photocatalytic activity, achieving both chemical stability and improved photocatalytic efficiency through synergistic composite material design.
Solution Approach 2:
The patent employs electrospun polymer fibers with controlled porosity (50-80%) as the substrate for photocatalytic materials. The porous structure increases the specific surface area available for photocatalytic reactions while maintaining air permeability, thereby improving photocatalytic quantum efficiency without compromising the chemical stability of the semiconductor materials.
2Ease of manufacture
If traditional photocatalytic materials are used, then simplicity of process is improved, but solar spectral response deteriorates (limited to ultraviolet band, only 4% of solar spectrum)
Solution Approach 1:
The patent modifies the physical and chemical parameters of the photocatalytic system by controlling fiber diameter (50-500 nm), porosity (50-80%), and semiconductor nanoparticle size and distribution on the fiber surface. These parameter changes enhance light scattering and absorption in the visible spectrum while maintaining UV response, expanding solar spectral utilization without complicating the manufacturing process.
3Adaptability or versatility
If traditional filter screen structures are used, then compatibility with photocatalytic materials is improved, but adsorption capacity deteriorates
Solution Approach 1:
The patent uses electrospun polymer fibers with high porosity (50-80%) and large specific surface area as the filter screen substrate. This porous structure provides abundant active sites for adsorbing organic pollutants while maintaining compatibility with semiconductor photocatalytic materials through surface functionalization, simultaneously improving adsorption capacity and photocatalytic compatibility.
4Device complexity
If traditional filter screen structures are used, then structural simplicity is improved, but air permeability and light transmittance deteriorate
Solution Approach 1:
The patent employs thin electrospun polymer fiber membranes as the filter screen structure. These thin, flexible films with controlled porosity provide high air permeability and light transmittance while maintaining structural integrity and simplicity. The electrospun fiber network creates a lightweight, breathable structure that allows efficient air flow and light transmission without complex multi-layer designs.
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
This solution significantly improves photocatalytic efficiency, enables broad-spectrum air purification, and reduces costs by maximizing sunlight utilization and extending the service life of the purification system through efficient degradation of organic pollutants.
Implementation Method 1
When a size of a metal nanostructure is reduced to a nano scale, it will exhibit unique optical characteristic-surface plasmon effect. Surface plasmon refers to surface wave resonance generated by free electrons driven by a light field when an incident light irradiates a metal surface.
Implementation Method 2
Surface plasmons on metal nanostructures generate high-energy electrons in non-radiative transitions, which are called 'hot electrons'. Therefore, such high-energy electrons have sufficient energy, so that a barrier between plasmonic metal nanostructures and semiconductor nanomaterials can be overcome
Implementation Method 3
Electrospinning is a special fiber manufacturing process, in which a polymer solution or a melt is usually jet spun in a strong electric field. Under the effect of an electric field, a droplet at a needle will change from spherical to conical, i.e. Taylor cone, and extend from the tip of the cone to obtain fiber filaments.
Data Source
AI summary
A method for preparing a porous nano-fiber heterostructure photocatalytic filter screen includes: preparing a noble metal nanostructure with tunable spectra and a heterostructure composite photocatalyst of a photocatalytic material; and preparing a large area and multilayer porous nano-fiber filter screen structure, while utilizing a scattering enhancement effect of metal nanoparticles in an porous optical fiber to realize repeated conduction of sunlight in the optical fiber and finally interact with the composite photocatalyst on a surface to improve photocatalytic efficiency. Preparation of the heterostructure composite photocatalyst with a wide spectral response of and tunable visible to infrared band spectra is realized, at the same time, with reference to high adsorbability, high light transmission of nanometer fiber and unique optical characteristics of metal nanoparticles, an air purification filter screen with a high sunlight utilization rate and a high catalytic degradation capability is creatively provided.