SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Tong Huang,Qiuyu Wu,Dong Qi,Feifan Yang,Yaqiong Xie,Guangru Zhang,Xin Liu,Gongping Liu,Haipeng Zhu
Natural gas upgrading demands advanced CO 2 /CH 4 separation membranes for CO 2 removal. Polymer of intrinsic microporosity (PIM-1) represents a novel polymeric molecular sieve featuring exceptional permeability and processability, but its moderate CO 2 /CH 4 selectivity remains challenging. Plasma treatment, a well-applied technique for surface modification of dense polymers, has been adopted to PIM with abundant interchain micropores for the first time. The physical alteration of plasma treatment in He gas atmosphere, primarily the chain scission, has significant impacts on CO 2 /CH 4 separation performance of PIM-1 membrane, by means of regulating its hierarchical microporous structure. Wide angle X ray scattering (WAXS) results suggest that the relatively large micropores are more prone to shrinkage and collapse than relatively small ones, which effectively enhances the selectivity. Moreover, owing to near-surface localization effect, the plasma modification is constrained within a skin layer onto a bulk intact layer. This asymmetric membrane structure allows the balance of enhancing CO 2 /CH 4 selectivity and sustaining high CO 2 permeability. By optimizing plasma input power and duration, the selectivity of plasma-treated PIM-1 membrane increased by 1.65 times, with a high permeability of over 4000 Barrer. After 2-month aging, the permeability was still maintained 60 % of its initial value. This suggests plasma treatment as a promising post-modification method for PIM CO 2 /CH 4 separation membranes.
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CRYSTAL GROWTH & DESIGN
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2025
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IF 3.4
Yingying Liu,Lintao Sun,Huazheng Xu,Xuening Ma,Jiani Ren,Lanlan Jiang,Jia-nan Zheng,Yongchen Song
Crystal growth characteristics determine the formation of carbon dioxide (CO2) hydrate. This study experimentally realized the regulation of CO2 hydrate growth mode from multidimensional to one-dimensional based on multiphase transportation theory inside porous media and succeeded visually observing the ray type growth process of many hydrate crystals at the interface between bulk gas and porous media. There are a few nucleation points in each experimental case, and from which the hydrate bud crystals of approximately 0.74 mm in diameter grow above on the porous media, reaching 26 mm long at most. Analysis of mass transfer within porous media revealed that the continuous growth of hydrate buds is driven by water self-transportation among pores. That is why that either large particle (over 0.8 mm diameter) or low water saturation (less than 30%) inhibits the effective growth of hydrate buds. In particular, by dynamic tracking in continuous images, the growth rates under different water saturation and particle size conditions are quantified, and the one-dimensional growth rate of hydrate is determined as 0.04 mm/s. This study unveils the mystery growth mechanism of CO2 hydrate for the first time and is extremely significant to future researches on the fundamental and application of various gas hydrates.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2025
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IF 2.8
Chensheng Dong,Qingping Xin,Qiang Ma,Kongyin Zhao,Yupeng Kou,Yucheng Pan,Huajian Gao,Lizhi Zhao,Xiaoli Ding,YuZhong Zhang,Wei Huang,Lantian Dong,Xinqi Li
Versatile layered fluoride-cerium nanosheets with thickness about 1.60 nm denoted as F-Ce are fabricated by a convenient and environmentally friendly approach. Then, Pebax-1657 is used as the polymer matrix and F-Ce as inorganic fillers to produce mixed-matrix membranes (MMMs) for gas separation. Versatile functions in enhancing the membrane performances are exhibited by F-Ce with intrinsic dual channels. On one hand, the abundant mesoporous slits in F-Ce enhance gas diffusion, constructs high-speed transport pathways of CO 2 and improve CO 2 permeability; on the other hand, molecular-sieving d -spacing in F-Ce endows MMMs with prominently preferential CO 2 transport, which favors the increment of CO 2 /CH 4 selectivity. Furthermore, F-Ce tends to horizontal arrangement and endows the MMMs with preeminent polymer–nanosheet interfacial compatibility, thereby facilitating the superior performance of F-Ce in MMMs and leading to improvements in both permeability and selectivity. In addition, the F-Ce exhibits an affinity for CO 2 and constructs “CO 2 -philic, CH 4 -phobic” regions in MMMs, and the CO 2 -philic regions significantly improves CO 2 /CH 4 solubility selectivity and selectivity. The permeability and selectivity of MMMs in humidified state come to maximum values, 1508 Barrer and 37, respectively, at 8 wt% F-Ce loading, overcoming Robeson Upper Bound (2008). Besides, the mechanical stability of MMMs was investigated.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Jinghao Lu,Lili Yang,Chuanhui Zhang,Haijie Cao,Xingyun Li,Lianying Zhang,Chang Long,Xiu Song Zhao
Realizing the evolution of Cu valence state in the electrocatalytic CO 2 reduction reaction (eCO 2 RR) is crucial to maintain active sites, optimize reaction conditions and product selectivity and understand reaction mechanism and kinetics. In this context, we investigated the dynamic transition of Cu(II), Cu(I) and Cu(0) under the eCO 2 RR conditions and impact of such transition on reaction intermediate species and product selectivity. In situ surface-enhanced Raman spectroscopy and attenuated total reflectance-surface-enhanced infrared absorption spectroscopy results coupled with quantitative data collected from a flow cell show that Cu (I) species contributes to CO 2 activation, CO adsorption, and subsequent C–C coupling processes, while the initial adsorption of Cu (0) in CO 2 playing a crucial role. These findings clarify how the valance of Cu changes with applied cathodic potential and reaction time, thus offering guidelines on optimization of operating conditions during CO 2 electrolysis to maintain the active sites responsible for forming desirable products. These new understandings lay a solid ground for purposely designing Cu-based catalysts for improved performance in CO 2 electrolysis, significantly advancing our knowledge on the behavior of Cu-based electrocatalysts in CO 2 electrolysis.
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JOURNAL OF SURFACTANTS AND DETERGENTS
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2025
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IF 1.8
Sihang Ma,Yuanyuan Wang,Qingfeng Hou,Yifeng Liu,Xiaoling Yi,Zhuoyan Zhu,Zhidong Chang
CO 2 -responsive switchable microemulsions have attracted significant attention due to their substantial potential in organic synthesis, drug delivery, and nanomaterial preparation. This study presents a microemulsion system composed of N ′-dodecyl- N , N -dimethyl acetamidine, 1-hexanol, brine, and tetradecane. The phase behavior of the microemulsion system was systematically investigated through a salinity scan to access its salinity dependence, while the solubilization ratios were also evaluated. Furthermore, the microstructural characteristics of the microemulsion system were examined using dynamic light scattering, small-angle X-ray scattering, and interfacial tension measurements. A transition from Winsor I to Winsor III, and subsequently to Winsor II, was observed in the alkyl acetamidine surfactant-based microemulsion as salinity increased, with the smallest domain size and most ordered microstructure occurring near the optimal salinity. Notably, the three-phase microemulsion system demonstrated the ability to reversibly switch between emulsification and demulsification upon CO 2 or N 2 injection, showcasing its dynamic responsiveness. This study enhances the understanding of CO 2 -responsive microemulsions and offers potential pathways for sustainable chemical processes. Graphical
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
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IF 15.7
Li Xiaotong,Gao Kainan,Qu Mingliang,Li Nanhui,Lv Xiangzhou,Wu Xiuju,Lin Qingyang,Wu Hao Bin
Reducing the electrical energy consumption for formic acid electro-synthesis is indispensable for advancing its industrial implementation. In a conventional CO 2 electrolyzer, most input electrical energy is consumed by the unprofitable anodic oxygen evolution reaction (OER) and ohmic drop. Electrolyzer engineering provides a promising platform to boost electrical energy utilization efficiency beyond catalyst optimization. Herein, we demonstrate a membrane-free CO 2 electrolyzer design that pairs electrochemical CO 2 reduction (CO 2 R) with an all-liquid-phase anodic reaction, enabling dual production of formate at both electrodes with significantly reduced cell voltage. The optimized design exhibits the lowest electrical energy consumption (< 310 kJ mol -1 formate ) at cell voltages below 2.7 V across a current density range of 0.05–0.4 A cm -2 . This cell also maintains stable operation at 2.25 V for 313 h with a < 20 % increase in electrical energy consumption. Systematic techno-economic analysis (TEA) evaluates the economic viability of this design for formic acid electro-synthesis, revealing a potential roadmap towards low-cost formic acid production. This strategy provides guidelines for CO 2 R electrolyzer engineering toward energy-efficient, economically viable production of valuable chemicals.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Hong-Mei Jiang,Jian Sheng,Jie Fan,Hang Yao
Developing high-performance Ni-based catalysts for low-temperature CO 2 methanation remains challenging due to Ni particle aggregation caused by weak metal-support interactions at high loadings. To address this issue, Sm-modified Ni catalysts were prepared via direct reduction of Sm-doped NiMgAl layered double hydroxide precursors. The optimized 1.0Sm-NiMgAl-R catalyst exhibited markedly improved activity and stability compared to the unmodified sample, maintaining a 53 % CO 2 conversion and a CH 4 productivity of 142 mmol g cat −1 h −1 during a 115-h test at 240 °C. H 2 -TPR and XPS analyses revealed that Sm promoted electron transfer to Ni, which strengthened the metal–support interaction and stabilized the Ni nanoparticles. CO 2 -TPD and O 1s XPS confirmed that Sm incorporation promoted the formation of weak/medium basic sites and surface oxygen vacancies, facilitating CO 2 activation. In situ DRIFTS showed that Sm doping favored the formate pathway via enhanced ∗HCOO formation and suppressed carbonate species (∗HCO 3 ) under low-temperature conditions, leading to improved methanation performance. This work offers a novel strategy for designing efficient and sustainable catalysts for low-temperature CO 2 methanation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Tong Wang,Wei Wu,Jiayi Zhang,Yang Xie,Xiaobing Deng,Hang Xiao,Xi Chen,Liangliang Zhu
Direct air capture (DAC) of CO₂ is pivotal for mitigating climate change, with moisture-swing adsorbents emerging as an energy-efficient approach to this end. Herein, we report ultra-high capacity quaternized polyethylene terephthalate (QPET) adsorbents fabricated via ultraviolet-induced grafting of quaternary ammonium groups onto PET substrates. The resulting QPET fabric exhibits a remarkably high adsorption capacity of 6.08 mmol/g under ambient conditions, which is 1.64 times that the prior record (3.71 mmol/g) for moisture-swing adsorbents, and is over 6 times that of the most-studied resin-based adsorbents. This exceptional performance is attributed to the high density of grafted quaternary ammonium groups and the intrinsic three-dimensional fibrous network of the PET fabric substrate, which provide abundant CO₂ adsorption sites and gas diffusion channels. The adsorbent demonstrates excellent cyclic stability, retaining consistent adsorption/desorption capacities across three full cycles and ten short-term cycles. Furthermore, its moisture-driven regeneration mechanism obviates the need for thermal or pressure inputs, while the utilization of low-cost PET substrates enhances scalability. This work provides a promising strategy for developing high-performance, cost-effective adsorbents tailored for large-scale CO₂ capture from ambient air.
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ACS Sensors
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2025
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IF 9.1
Jiyuan Xue,Bingcheng Shen,Juan Wang,Juan Li,Hongran Zhao,Tong Zhang
Carbon dioxide (CO2) is ubiquitous in both natural and indoor atmospheres, playing a pivotal role in global climate regulation, air quality, and biological processes. However, their chemical inertness poses inherent challenges for developing compact, high-sensitivity detection platforms. In living organisms, CO2 often modulates protein function through reversible carbamylation of lysine residues, illustrating a finely tuned molecular recognition mechanism. Inspired by this principle, we developed a bioinspired iontronic sensor by embedding lysine moieties into a cross-linked poly(ethylene glycol) diacrylate (PEGDA) hydrogel. Upon exposure to CO2, the lysine ε-amino group forms transient carbamate adducts, inducing the electrostatic interaction, which disrupts Grotthuss-like conduction pathways and causes a distinct impedance increase. This lysine-based recognition enables high selectivity over interfering gases and operates reliably under ambient conditions. The resulting hydrogel sensor exhibits excellent linearity (R2 > 0.995) from 0 to 2000 ppm of CO2, with a theoretical detection limit of ∼76 ppm, suitable for indoor and ambient atmospheric CO2 monitoring at low concentrations. Furthermore, it maintains stable performance over at least 28 days of repeated measurements and shows negligible cross-sensitivity toward common interfering gases (e.g., H2S, CH4, and formaldehyde). By harnessing lysine–CO2 carbamylation within an ion-conducting matrix, our approach provides a versatile, low-power platform for precise CO2 sensing in applications ranging from indoor environmental evaluation to plant-level respiratory monitoring.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2026
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IF 2.1
Minjie Gao,Congfei Zhu,Yasen Dai,Bingru Wang,Shuhang Ren,Weize Wu
Deep eutectic solvents (DESs) show great potential in the field of CO2 capture; however, the lack of systematic physicochemical property data remains a bottleneck constraining their rational design and industrial application. This study prepared six representative DESs and systematically characterized their key fundamental properties as absorbents: density, viscosity, thermal stability, and specific heat capacity. The results indicate that the chemical structure of the hydrogen bond acceptor has a decisive influence on the properties of the DESs. The viscosity and density of all DESs decreased significantly with increasing temperature. Thermogravimetric analysis revealed their varying thermal stabilities, with the onset decomposition temperature ranging from 366.52 K (menthol–ethylene glycol) to 415.17 K (choline chloride–ethylene glycol). The measurement of specific heat capacity data provides a key basis for evaluating solvent regeneration energy consumption. This study fills the gap in systematic property data of various DESs. Comprehensive analysis indicates that the choline chloride-ethylene glycol system achieves the best balance among viscosity, thermal stability, and specific heat capacity, making it a highly promising candidate based on its physicochemical property profile for CO2 capture among the studied systems. This work provides solid data support and theoretical guidance for the screening, design, and energy optimization of DESs in CO2 capture processes.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122721
·
IF 7.5
Nitin Goyal,Peng Gao,Liying Liu,Haoran Liu,Zhe Wang,Shuwen Cheng,Gang Li
The development of efficient and scalable solid sorbents is crucial for advancing CO 2 capture technologies. While commercial activated carbons are inexpensive and porous, they typically exhibit low CO 2 selectivity. This study demonstrates a facile two-step strategy to significantly enhance the CO 2 capture performance of a commercial granulated activated carbon (DGAC). The carbon was first oxidized with nitric acid to create anchoring sites, and then impregnated with the amine-rich polymer polyethylenimine (PEI). Comprehensive characterization like SEM-EDS, XPS, BET confirmed the successful incorporation of PEI onto the oxidized surface. The modified adsorbent (O-DGAC@PEI) achieved a remarkable CO 2 adsorption capacity of 4.67 mmol/g at 273 K and 1 bar, nearly double that of the pristine DGAC (2.6 mmol/g). More importantly, it exhibited exceptional CO 2 /N 2 selectivity of 349 (for a 15/85 CO 2 /N 2 mixture), as calculated by the Ideal Adsorption Solution Theory (IAST). The high isosteric heat of adsorption of 73.63 kJ/mol confirms chemisorption as the dominant mechanism, facilitated by the introduced amine groups. The adsorption process was spontaneous and well-described by the Dual-site Langmuir model. Thus, O-DGAC@PEI offers a favorable balance of high adsorption capacity, strong humidity resistance, and stable cyclic performance, distinguishing it from previously reported systems and demonstrating its potential for practical CO 2 capture applications.
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Jiasen He,Ruimin Zhao,Xuran Li,Qiannan Wang,Yumeng Xiao,Yue Wu,Tony D. James,Lidong Wang,Meng Li
The catalytic conversion of CO 2 into value-added chemicals via epoxide cycloaddition represents a promising route for sustainable carbon utilization. Herein, a facile one-pot doping strategy is developed to fabricate a robust and cost-effective catalyst from biomass waste rice husk. The N-doped carbon dots (CDs) are in situ synthesized and simultaneously doped within a mesoporous silica network via covalent C-O-Si bonds, followed by Cu(II) ions coordinating doping. The incorporation of hydrogen bond donor (such as hydroxyl groups) and Lewis base sites (nitrogen groups) on the CDs within the silica network synergistically activate the epoxides and CO 2 molecules, meanwhile the Si O protective layer promotes the catalytic stability. Furthermore, density functional theory (DFT) calculations reveal that Cu N complexes lower the energy barrier by facilitating epoxide activation. The resulting multi-confined catalyst delivers a 99% yield within 15 h at 80 °C and 1 atm CO 2 , retaining its activity after ten cycles. Life cycle and techno-economic analyses reveal that the prepared catalyst produces less CO 2 emissions and reduces the cost of styrene carbonate production to $31.3 per kg, below the commercial value ($100 per kg). This work paves a new way for sustainable and economical CO 2 valorization via highly efficient and stable catalyst.
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