Monolithic Composite Photocatalyst for Fluid Purification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current photocatalytic 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, limiting their effectiveness in air and water purification and antimicrobial applications.
Innovation Solution
A TiO2-based monolithic composite photocatalyst with small, discrete photoactive nanocrystals (<5 nm) dispersed within a non-photoactive porous support, enhancing surface area and reactive site availability, and allowing for efficient mineralization of organic compounds and antimicrobial activity across a range of wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TiO2-based photocatalytic systems are used for mineralization of organic compounds, then photocatalytic activity is achieved, but mineralization quantum yields are low and conversion is incomplete
Solution Approach 1:
The patent employs composite photocatalytic systems combining TiO2 with other materials (such as metal nanoparticles, semiconductors, or carbon structures) to enhance both the mineralization rate and conversion completeness. The composite structure allows synergistic effects where different components contribute to extended light absorption, improved charge separation, and enhanced catalytic activity, thereby achieving high productivity while maintaining reliable complete conversion of organic compounds to CO2 and H2O.
2Productivity
If TiO2 photocatalyst is used, then photocatalytic activity is achieved, but catalyst fouling occurs reducing performance over time
Solution Approach 1:
The patent extracts or removes the fouling-prone components from the TiO2 surface by applying surface modifications such as coating with hydrophilic materials, metal oxides, or organic molecules that prevent adsorption of organic contaminants. This extraction of the fouling mechanism allows the catalyst to maintain its photocatalytic activity over extended periods without performance degradation.
Solution Approach 2:
The patent modifies surface parameters of TiO2 through doping with metals or non-metals, changing surface charge, hydrophilicity, and electronic structure. These parameter changes reduce the tendency for organic compound adsorption and product accumulation, thereby preventing fouling and extending catalyst operational life while maintaining high photocatalytic activity.
3Productivity
If TiO2 photocatalyst particles are used, then photocatalytic activity is achieved, but aggregation and attrition reduce performance
Solution Approach 1:
The patent coats TiO2 particles with thin protective films or flexible shell structures that prevent aggregation by providing steric or electrostatic repulsion. These coatings also protect against attrition during handling and operation, maintaining particle integrity and dispersed state, thereby preserving photocatalytic activity over time without requiring frequent replacement or re-dispersion.
4Adaptability or versatility
If photocatalytic systems are designed for air and water purification, then purification function is achieved, but system complexity increases
Solution Approach 1:
The patent designs photocatalytic systems with universal TiO2-based catalysts that can function effectively in both air and water purification applications without requiring separate specialized systems. The catalyst formulation and reactor design are optimized to handle different phases (gas and liquid) and various contaminant types, reducing overall system complexity while maintaining versatility across multiple purification applications.
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 with improved attrition resistance and light utilization, overcoming previous limitations in photocatalytic systems by maximizing reactive sites and maintaining performance over time.
Implementation Method 1
TiO2-based monolithic composite photocatalyst that is useful for the mineralization of organic volatile organic compounds and gaseous organic compounds
Implementation Method 2
allowing for efficient mineralization of organic compounds and antimicrobial activity across a range of wavelengths
Data Source
AI summary
Monolithic composite photocatalysts for fluid purification, chemical transformations, and surface sterilization 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.