Nitrogen-Doped TiO2 Coating for Visible Light Photocatalysis
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Solution Overview
Problem
Current air filtration systems using titanium dioxide photocatalysts face inefficiencies due to limited activation by visible light and issues with nitrogen-doped TiO2 powder adhesion, leading to reduced scalability and photocatalytic performance in oxidizing indoor pollutants like NOx and VOCs.
Innovation Solution
A nano-functionalized support with a nitrogen-doped titanium dioxide coating on a ceramic honeycomb structure, optimized for broad visible light activation and improved adhesion, enhancing photocatalytic efficiency and scalability for air filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If titanium dioxide is used as photocatalyst in air filters, then pollutant degradation capability is improved, but activation efficiency under visible light remains poor
Solution Approach 1:
The patent applies parameter changes by doping titanium dioxide with nitrogen-containing compounds, which modifies the optical band gap energy of the photocatalyst. This chemical modification enables the TiO2 to absorb visible light (400-780 nm) in addition to UV light, thereby improving activation efficiency under visible light while maintaining pollutant degradation capability
Solution Approach 2:
The patent creates a composite material system by combining titanium dioxide nanoparticles with nitrogen-containing dopants (such as urea, ammonium salts, or organic ammonium compounds). This composite structure integrates the photocatalytic properties of TiO2 with the light-absorbing characteristics of nitrogen doping, achieving both high reliability in pollutant degradation and improved visible light activation
2Reliability
If nitrogen-doped TiO2 powder is applied to support, then photocatalytic efficiency in visible region is improved, but adhesion to support surface deteriorates
Solution Approach 1:
The patent employs a thin film coating approach by applying the nitrogen-doped TiO2 powder to a porous ceramic support with controlled thickness. The thin film structure ensures uniform distribution of photocatalytic particles while maintaining strong adhesion to the support surface, preventing powder detachment while preserving photocatalytic efficiency
Solution Approach 2:
The patent utilizes a porous ceramic support structure with optimized pore size and surface area. The porous morphology provides mechanical interlocking and increased surface contact area for the nitrogen-doped TiO2 coating, thereby improving adhesion while maintaining the photocatalytic activity and visible light absorption efficiency
3Reliability
If loose TiO2 powder is used in coating, then photocatalytic activity is improved, but product loss during washing increases
Solution Approach 1:
The patent applies a controlled thin film coating of nitrogen-doped TiO2 on the ceramic support, creating a adherent layer that prevents powder loss during washing. The thin film structure maintains sufficient photocatalytic activity while ensuring that the coating remains attached to the support, eliminating the need for extensive washing that would remove loose particles
Solution Approach 2:
The patent employs a spray application method using pneumatic or hydraulic systems to deposit the nitrogen-doped TiO2 suspension onto the support. This controlled deposition process ensures uniform coating thickness and strong adhesion, preventing product loss during subsequent washing steps while maintaining photocatalytic activity
4Stability of the object's composition
If washing step is added to remove loose powder, then adhesion quality is improved, but photocatalytic efficiency decreases
Solution Approach 1:
The patent applies a thin film coating technique that inherently provides good adhesion without requiring extensive washing. The controlled thin film structure ensures that the nitrogen-doped TiO2 remains attached to the support surface, maintaining photocatalytic efficiency while achieving sufficient adhesion quality without the need for aggressive washing steps that would remove active particles
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 nano-functionalized support effectively degrades NOx and VOCs using visible light, offering improved photocatalytic efficiency and reduced waste, with enhanced adhesion and scalability for industrial applications.
Implementation Method 1
titanium dioxide has photocatalytic properties that can be activated when the compound is illuminated with ultraviolet light... The incident photons are absorbed by the titanium dioxide, giving rise to the formation of radicals that are capable of oxidizing many environmental contaminants
Implementation Method 2
only 5% of the visible light radiation is able to activate it... modifies the band gap energy of titanium dioxide, increasing its photocatalytic efficiency in the visible region
Implementation Method 3
using TiO2 doped with nitrogen, which modifies the band gap energy of titanium dioxide, increasing its photocatalytic efficiency in the visible region
Implementation Method 4
a photocatalytic nanoparticle coating deposited on the application surface... configured to be deposited on the application surface
Data Source
AI summary
A nano-functionalized support (1) comprises an application surface (2) and a photocatalytic nanoparticle coating (3) deposited on the application surface (2). The photocatalytic nanoparticle coating (3) comprises titanium dioxide doped with a nitrogen-containing doping agent.