Photosensitive Sorbent Phase Switching for Low-Energy Gas Capture
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Solution Overview
Problem
Traditional sorption systems for capturing gases such as water vapor are limited by slow adsorption kinetics and are energy intensive, necessitating more efficient methods for capturing these gases.
Innovation Solution
The development of photosensitive sorbent materials that switch between an open and closed phase in response to specific light stimuli, allowing for rapid adsorption and desorption of target chemical species using light-responsive porous coordination networks (PCNs) with Type F-IV isotherm profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional sorption systems using desiccants are used, then gas capture function is provided, but adsorption kinetics are slow and energy consumption is high
Solution Approach 1:
The patent applies parameter changes by utilizing light wavelength as a control parameter to switch the sorbent material between open and closed phases. UV light triggers closure to enhance adsorption kinetics, while visible light induces opening to enable desorption, thereby optimizing both productivity and energy efficiency without requiring high-temperature heating
Solution Approach 2:
The patent replaces traditional thermal mechanical systems with an optical system. Instead of using heat to drive adsorption and desorption cycles, the invention uses photochemical transformations triggered by specific wavelengths of light, eliminating the need for energy-intensive thermal processing while achieving rapid phase transitions
2Reliability
If traditional sorption systems are used, then gas capture is achieved, but the process is energy intensive
Solution Approach 1:
The patent exploits phase transitions of the sorbent material between open and closed structural phases to achieve reliable gas capture. The material transitions to a closed phase upon UV irradiation to maximize adsorption capacity, then transitions back to open phase upon visible light irradiation for desorption, providing efficient and reliable gas capture without high energy intensity
Solution Approach 2:
The patent implements periodic action through cyclic irradiation with UV light followed by visible light. This periodic switching between closed and open phases creates alternating adsorption and desorption cycles, ensuring reliable gas capture efficiency while maintaining low energy intensity through the use of light energy rather than thermal energy
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
These materials offer enhanced kinetic performance and reduced energy consumption by enabling rapid and reversible adsorption and desorption cycles, with the potential to capture gases like water vapor and carbon dioxide efficiently.
Implementation Method 1
a dithienylethene as the photosensitive ligand incorporated into the backbone of the photosensitive sorbent material which undergoes a reversible photocyclization reaction between a ring-open structure and a ring-closed structure in response to UV light or visible light exposure
Implementation Method 2
The photosensitive sorbent material can adsorb the target chemical species when in an open phase
Data Source
AI summary
A device comprising a photosensitive sorbent material is configured to concentrate a target chemical species. The photosensitive sorbent material has a stepped Type F-IV isotherm profile with a high working capacity and can adsorb the target chemical species in a porous open phase. The photosensitive material can be converted into a less porous closed phase upon exposure to light of a certain wavelength through a photochemical transformation to allow for desorption and collection of the target chemical species. The photosensitive material can be converted back to the open phase upon exposure to light of a different wavelength for regeneration and this process can be repeated cycles of adsorption and desorption.