Phosphor-TiO2 Hybrid Filter Media for Visible-Light Photolysis
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Solution Overview
Problem
Titanium dioxide photocatalysts require high-energy ultraviolet light for activation, limiting their efficiency in sunlight and nano-sized particles pose application challenges in air purification systems.
Innovation Solution
A phosphor-transition metal-photocatalyst hybrid composite material is developed, using phosphor beads as a support for nano-sized titanium dioxide, coated with a photocatalyst and transition metal, enabling activation by both UV and visible light, and promoting photolysis even in dark environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If titanium dioxide photocatalyst is used, then strong photolysis performance is achieved, but photo-activation is limited to ultraviolet light only
Solution Approach 1:
The patent combines titanium dioxide photocatalyst particles with phosphor particles to create a composite material. The phosphor component absorbs visible light and converts it to ultraviolet light through down-conversion, enabling the TiO2 photocatalyst to be activated by visible light in addition to UV light, thereby expanding the light absorption range while maintaining strong photolysis performance
Solution Approach 2:
The phosphor acts as an intermediary substance that mediates between visible light and the titanium dioxide photocatalyst. It absorbs visible light photons and converts them to UV light photons that can activate the TiO2, serving as a bridge that enables indirect photo-activation by visible light
2Power
If nano-sized titanium dioxide particles are used, then photoactive reaction is enhanced, but direct application in devices becomes difficult
Solution Approach 1:
The patent merges the nano-sized titanium dioxide photocatalyst particles with phosphor particles into a single composite structure. The TiO2 nanoparticles are coated on or combined with the phosphor particles, allowing the nano-sized photocatalyst to be handled and applied as larger composite particles that are easier to manufacture and install in air purification devices
Solution Approach 2:
The patent creates a hierarchical structure where nano-sized TiO2 particles are localized on the surface of larger phosphor particles. This local concentration of photocatalyst material on the phosphor surface maintains high photoactive reaction capability while the overall composite particle size enables practical device application
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 composite material enhances photolysis efficiency, allowing effective air purification in various lighting conditions and facilitating easy integration into air purification systems.
Implementation Method 1
a phosphor material, and wherein the photocatalyst layer is formed on the surface of each of the plurality of beads supporting the plurality of transition metal particles
Implementation Method 2
generates radicals with strong oxidizing power when exposed to ultraviolet light, and the radicals decompose various environmental pollutants present in water or air into harmless carbon dioxide, water, etc.
Implementation Method 3
Titanium dioxide (TiO2), known as a representative photocatalyst material, generates radicals with strong oxidizing power when exposed to ultraviolet light
Data Source
AI summary
A phosphor-transition metal-photocatalyst hybrid composite material includes a plurality of beads including a phosphor material, a binder, and zeolite, a plurality of transition metal particles supported on the surface of each of the plurality of beads, and a photocatalyst layer formed on the surface of each of the plurality of beads supporting the transition metal particles by coating a photocatalyst material.