Mesoporous Carbon Membrane Ion Transport Modulation
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Solution Overview
Problem
Capacitive deionization (CDI) technology for water purification requires high voltages and involves a two-step ion absorption and desorption process, making it inefficient and costly for large-scale desalination applications.
Innovation Solution
A method using an electrically conductive mesoporous carbon membrane that operates at lower voltages and does not require a regeneration step, by applying a voltage to modulate ion transport between regions, effectively blocking ions instead of absorbing them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CDI technology is used for water purification, then ion removal is achieved, but high voltage requirements and energy consumption increase
Solution Approach 1:
The patent employs a porous membrane with specific pore size and structure to physically block ion transport. The porous structure allows selective passage of ions based on size exclusion and electrostatic interactions, achieving ion removal without requiring high voltages for electrochemical absorption as in CDI technology.
Solution Approach 2:
The invention replaces the electrochemical absorption mechanism of CDI with a physical barrier approach using a porous membrane. This mechanical/physical substitution eliminates the need for high voltage application and subsequent regeneration cycles, reducing overall energy consumption while maintaining ion removal effectiveness.
2Reliability
If CDI technology operates with continuous ion absorption and desorption cycles, then ion removal is maintained, but process complexity and operation time increase
Solution Approach 1:
The porous membrane provides continuous ion rejection as long as it remains in the system, eliminating the need for cyclic absorption-desorption operations. The membrane continuously blocks ion transport through its physical structure, simplifying the operation to a single continuous process without regeneration steps.
Solution Approach 2:
The invention extracts the regeneration step from the CDI process by using a membrane that does not require regeneration. The porous membrane structure permanently provides ion rejection capability without needing to be regenerated, thereby simplifying the overall process and reducing operational complexity.
3Reliability
If CDI technology uses electrode absorption for ion removal, then ion concentration is reduced, but regeneration step and energy burden increase
Solution Approach 1:
The patent converts the harmful effect of requiring regeneration energy in CDI into a benefit by using a porous membrane that permanently rejects ions without absorption. The membrane's physical structure provides lasting ion rejection capability, transforming the energy burden of regeneration into a one-time fabrication cost with no ongoing regeneration energy requirements.
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 method achieves efficient ion transport regulation at lower voltages, reducing energy consumption and eliminating the need for electrode regeneration, thereby enhancing the cost-effectiveness and scalability of water purification processes.
Implementation Method 1
applying an electric potential on the mesoporous carbon membrane to modulate the degree of ion transport between the first and second regions
Implementation Method 2
an increase in applied voltage results in a reduction in the degree of ion transport between the first and second regions, optionally up to a critical voltage at which ion transport across the membrane ceases
Data Source
AI summary
A method for regulating ion transport between first and second regions of a liquid solution containing ionic species in at least one of said first and second regions, the method comprising applying a voltage on an electrically conductive mesoporous carbon membrane situated between said first and second regions of the liquid solution, wherein liquid flow between first and second regions is permitted only through said mesoporous carbon membrane, and the applied voltage is selected to modulate the degree of ion transport between said first and second regions, wherein an increase in applied voltage results in a reduction in the degree of ion transport between said first and second regions, optionally up to a critical voltage at which ion transport ceases.