Functionalized Membrane Surface for Pathogen Capture and Destruction
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Solution Overview
Problem
Current water treatment methods face challenges in effectively removing small pathogens like viruses and addressing biofouling, which limits the efficiency and lifespan of filtration membranes, and public confidence in water quality remains low due to contamination concerns.
Innovation Solution
Functionalized surfaces with high charge density binding components and photocatalysts, such as delaminated titanates, are applied to membranes to capture and destroy pathogens and organic materials through chemical affinity and photocatalytic oxidation, reducing the need for size-exclusion filtration and minimizing biofouling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If size-exclusion filtration is used to remove pathogens, then filtration simplicity is maintained, but small pathogens like viruses cannot be effectively removed
Solution Approach 1:
The patent changes the filtration mechanism from physical size-exclusion to chemical affinity-based capture by functionalizing the membrane surface with specific chemical groups (e.g., cationic groups for anionic viruses). This parameter change in the interaction mechanism enables effective capture of small pathogens like viruses that cannot be removed by size-based filtration alone.
Solution Approach 2:
The patent creates a composite membrane structure combining the base filtration material with functionalized surface layers containing photocatalytic materials (e.g., titanium dioxide) and chemical affinity groups. This composite structure provides both filtration capability and enhanced pathogen capture through chemical interactions.
2Reliability
If conventional filtration membranes are used, then initial treatment effectiveness is achieved, but biofouling reduces membrane lifespan
Solution Approach 1:
The patent incorporates photocatalytic materials (e.g., titanium dioxide) into the membrane structure that actively decompose organic contaminants and prevent biofouling when exposed to light. This self-cleaning mechanism allows the membrane to maintain its performance over time without external intervention, extending its operational lifespan while maintaining treatment effectiveness.
Solution Approach 2:
The patent converts the harmful accumulation of organic contaminants and biofouling into a beneficial self-cleaning process by using photocatalytic materials that transform these contaminants into harmless substances through light-driven decomposition, thereby extending membrane life.
3Reliability
If filtration media is frequently replaced due to biofouling, then treatment effectiveness is maintained, but operational costs increase
Solution Approach 1:
The photocatalytic self-cleaning function eliminates the need for frequent membrane replacement by continuously preventing biofouling accumulation. This reduces operational costs associated with media replacement while maintaining consistent water quality standards through the membrane's extended service life.
4Reliability
If public confidence in water quality is to be increased, then advanced treatment technologies are needed, but treatment complexity increases
Solution Approach 1:
The patent merges multiple functions (filtration, chemical affinity capture, and photocatalytic decomposition) into a single integrated membrane structure. This combination provides advanced pathogen and contaminant removal capabilities that increase public confidence in water quality while avoiding the need for complex multi-stage treatment systems.
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 effectiveness of water treatment by capturing and destroying pathogens and organic contaminants, extending membrane lifespan, reducing operational costs, and increasing public confidence in water quality, thus addressing the global water crisis.
Implementation Method 1
a high charge density binding component attached to the surface and capable of binding a microorganism or organic molecule or organic material thereto
Implementation Method 2
photocatalysts, such as delaminated titanates, are applied to membranes to capture and destroy pathogens and organic materials through chemical affinity and photocatalytic oxidation
Data Source
AI summary
The disclosure is directed to a surface having a binding component applied thereto for the adsorption or capture of pathogens and organic molecules or materials. The surface may be a component of a porous or nonporous substrate. The binding component may also bind a photocatalyst to the surface for photocatalytic destruction of the captured pathogens and organic molecules or materials.