Nitrogen-Doped Titanium Dioxide Photocatalyst for Air Purification
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Solution Overview
Problem
Current air purification systems, particularly those using photocatalytic reactors, face limitations in effectively removing airborne contaminants like benzene and formaldehyde, and there is a need for enhanced photocatalytic materials that can improve the efficiency and effectiveness of air treatment in conditioned spaces such as aircraft cabins.
Innovation Solution
The method involves introducing a gas mixture of hydrogen, nitrogen, and ammonia to a fluidized bed to react with titanium dioxide particles, forming nitrogen-doped titanium dioxide, which is then used in a catalytic reactor along an air flow path in operative communication with a light source to enhance photocatalytic activity for air treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photocatalytic reactors using pure titanium dioxide are used, then the system structure is simple and easy to manufacture, but the photocatalytic activity is insufficient for effectively removing airborne contaminants
Solution Approach 1:
The patent modifies the chemical composition parameters of titanium dioxide by doping it with nitrogen and metal elements (such as platinum, palladium, or rhodium) to enhance photocatalytic activity. This changes the material's electronic structure and light absorption properties, enabling more effective contaminant removal while maintaining a relatively simple reactor design.
Solution Approach 2:
The patent creates composite photocatalytic materials by combining titanium dioxide with nitrogen and metal elements. These composite materials exhibit synergistic effects where the metal nanoparticles and nitrogen-doped sites work together with TiO2 to improve photocatalytic efficiency under UV irradiation, resolving the contradiction between activity and manufacturing complexity.
2Object-affected harmful factors
If the photocatalytic reactor is placed in aircraft cabins, then air quality in conditioned spaces is improved, but the system requires integration with existing aircraft environmental control systems
Solution Approach 1:
The patent designs the photocatalytic reactor to be compatible with existing aircraft environmental control systems, allowing it to perform multiple functions: air purification through photocatalysis, integration with the aircraft's existing air circulation system, and operation under the aircraft's UV lighting conditions. This multi-functionality approach enables contaminant removal without requiring a completely separate complex system.
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 approach enhances the photocatalytic activity of titanium dioxide, leading to improved oxidation of airborne contaminants into less harmful compounds, effectively improving air quality in conditioned spaces, including aircraft cabins.
Implementation Method 1
particles comprising titanium dioxide are introduced to the fluidized bed to form a fluid mixture of the particles and gas in the fluidized bed. The particles are reacted with the gas in the fluid mixture to form particles comprising titanium dioxide and nitrogen.
Implementation Method 2
When placed under an appropriate light source, typically a UV light source, the photocatalyst oxide interacts with airborne water molecules to form hydroxyl radicals or other active species. The hydroxyl radicals react with the contaminants and initiate an oxidation reaction that converts the contaminants into less harmful compounds
Implementation Method 3
a gas comprising hydrogen and nitrogen, or comprising hydrogen and ammonia, or comprising hydrogen, nitrogen, and ammonia, is introduced to a fluidized bed. The gas flows through the fluidized bed, and particles comprising titanium dioxide are introduced to the fluidized bed to form a fluid mixture of the particles and gas in the fluidized bed.
Data Source
AI summary
A method is disclosed in which a gas of hydrogen and nitrogen, or hydrogen and ammonia, or hydrogen, nitrogen, and ammonia, is introduced to a fluidized bed. The gas flows through the fluidized bed, and titanium dioxide particles are introduced to the fluidized bed to form a fluid mixture of the particles and gas in the fluidized bed. The particles are reacted with the gas in the fluid mixture to form particles including titanium dioxide and nitrogen. The particles can be disposed along an air flow path in operative communication with a light source for air treatment.