Monolithic Composite Photocatalyst for Fluid Purification
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Solution Overview
Problem
Current photocatalytic air purification systems using TiO2-based materials face challenges such as low mineralization quantum yields, incomplete conversion of reactants, catalyst fouling, and reduced performance due to aggregation and attrition of nanometer-scale TiO2 particles, leading to inefficiencies in purifying gases, liquids, and surfaces.
Innovation Solution
Development of a TiO2-based monolithic composite photocatalyst with photoactive nanocrystals less than 5 nm in size, dispersed within and on a non-photoactive porous support, enhancing surface area and reactive sites for efficient mineralization of organic compounds and antimicrobial activity, while minimizing attrition and fouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TiO2 nanometer-scale particles are used as photocatalyst, then photocatalytic activity is enhanced due to increased surface area, but aggregation and attrition occur leading to reduced performance over time
Solution Approach 1:
The patent employs a porous support structure with controlled pore sizes (2-50 nm) that physically confines TiO2 nanocrystals, preventing their aggregation and attrition while maintaining high surface area. The porous matrix provides a stable framework that holds the nanocrystals in place during operation, resolving the contradiction between high photocatalytic activity and performance stability.
Solution Approach 2:
The patent creates a composite material system combining TiO2 nanocrystals (1-5 nm) with a porous support matrix. This composite structure integrates the high surface area and photocatalytic activity of nanocrystals with the mechanical stability and structural integrity of the support, eliminating the aggregation and attrition problems of standalone nanocrystals.
2Productivity
If TiO2-based photocatalyst is used for mineralization of organic compounds, then degradation efficiency is improved, but catalyst fouling occurs reducing long-term performance
Solution Approach 1:
The porous support structure with its controlled pore architecture provides channels for reactant and product transport, preventing the accumulation of degradation intermediates that cause fouling. The porous matrix maintains catalyst accessibility while enabling efficient mass transfer, thus sustaining high mineralization rates over time without performance decay.
3Productivity
If photoactive nanocrystals are dispersed on support surface, then reactive sites are increased improving catalytic efficiency, but nanocrystal aggregation occurs reducing active surface area
Solution Approach 1:
The porous support with nanoscale pore dimensions (2-50 nm) physically disperses the TiO2 nanocrystals throughout the pore network, preventing aggregation while maximizing the exposed surface area. The three-dimensional pore structure provides extensive surface area for nanocrystal distribution, ensuring high catalytic efficiency is maintained without aggregation-related surface area loss.
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 monolithic composite photocatalyst achieves high mineralization rates and antimicrobial efficacy, maintaining performance over time with reduced attrition and fouling, and can operate at lower temperatures and pressures, making it suitable for various environmental applications.
Implementation Method 1
TiO2-based monolithic composite photocatalyst that is useful for the mineralization of organic volatile organic compounds and gaseous organic compounds (e.g., ethylene) to CO2 and H2O
Implementation Method 2
photoactive nanocrystals less than 5 nm in size, dispersed within and on a non-photoactive porous support, enhancing surface area and reactive sites for efficient mineralization
Data Source
AI summary
Monolithic composite photocatalysts for fluid purification are disclosed. The monolithic composite photocatalysts comprise a photoactive nanocrystal component and a non-photoactive porous support. Photocatalytic fluid purification systems that contact an impurity-containing fluid with the subject monolithic composite photocatalysts are also disclosed. The monolithic composite photocatalysts may be affixed to or embedded in scaffold structures to promote fluid flow through a fluid purification system and contact with the monolithic composite photocatalysts.