Molecular engineering of low-viscosity deep eutectic solvents for high-capacity and selective SO₂ capture.
Saved in:
| Title: | Molecular engineering of low-viscosity deep eutectic solvents for high-capacity and selective SO₂ capture. |
|---|---|
| Authors: | Cheng, Li-Ming1 (AUTHOR), Yin, Kang-Shou1 (AUTHOR), Xu, Jin-Bo1 (AUTHOR), Liu, Yong-Hui1 (AUTHOR), Wang, Shao-He1 (AUTHOR), Du, Jun1 (AUTHOR) dujun@ncu.edu.cn |
| Source: | Colloids & Surfaces A: Physicochemical & Engineering Aspects. May2026:Part 2, Vol. 737, pN.PAG-N.PAG. 1p. |
| Subjects: | Sulfur dioxide, Viscosity, Absorption, Environmental protection, Solvents, Hydrogen bonding, Chemical engineering, Imidazoles |
| Abstract: | Sulfur dioxide (SO₂) is a toxic industrial pollutant and valuable chemical feedstock, making its efficient capture critical for environmental protection and resource recycling. This work rationally designed a novel DES system using 1,3-dimethylimidazolium chloride ([Dim]Cl) as the hydrogen-bond acceptor (HBA) and imidazole as the hydrogen-bond donor (HBD), leveraging a previously underexplored design principle: structural simplification of the HBA cation to mitigate viscosity without sacrificing absorption performance. The optimized [Dim]Cl+imidazole (1:0.5) DES achieves an exceptional SO₂ absorption capacity of 20.69 ± 0.73 mol/kg at 298.2 K and 102.2 kPa (exceeds the majority) while maintaining a low viscosity of 47.1 ± 3.3 cP—over 4-fold lower than analogous [Emim]Cl-based DESs (198.3 cP) with comparable capacity and far below the viscosity of most high-capacity ILs (>200 cP). This low viscosity promotes rapid mass transfer, as confirmed by pseudo-first-order kinetics (k₁=0.089 ± 0.016 mol/(kg·min), R²> 0.98). The DES also exhibits outstanding selectivity (SO₂/CO₂=547, SO₂/N₂=1169) and perfect regenerability over ten cycles. At low concentrations(＜10kpa), the DES exhibits enhanced selectivity(SO₂/CO₂=5013, SO₂/N₂=15563). A synergistic absorption mechanism was elucidated via spectroscopic analysis and quantum chemical calculations: SO₂ is simultaneously captured by multiple sites—Cl⁻ (strong nucleophilic coordination) and the imidazole ring (weak basicity and hydrogen-bonding facilitation). This multi-site interaction is the origin of the DES's superior performance. [Display omitted] [ABSTRACT FROM AUTHOR] |
| Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
Be the first to leave a comment!
