CHEMICAL ENGINEERING SCIENCE
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2026
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IF 5.1
Ijaz Ul Haq,Wang Jie,Shuqin Miao,Weihua Shen,Yunjin Fang
Poly(propylene carbonate) (PPC), a sustainable polymer derived from CO 2 , has emerged as an attractive alternative to petrochemical-based polyether polyols. Nevertheless, achieving high activity, a perfectly alternating microstructure, narrow dispersity (Đ), and excellent selectivity simultaneously in PPC synthesis has remained challenging. Herein, a binary catalyst system composed of tetrabutylammonium hydrogen sulfate or tetrabutylphosphonium hydrogen sulfate (TBAHS or TBPHS) in combination with triethylboron (Et 3 B) is reported. Density functional theory (DFT) calculations revealed that CO 2 is initially activated by the hydrogen sulfate anion to generate a carbonate intermediate, which subsequently undergoes nucleophilic attack on propylene oxide (PO) activated by Et 3 B. Under optimized conditions, the TBPHS/Et 3 B system delivered a turnover frequency (TOF) of 1051 h⁻ 1 , an average molecular weight (Mn) of 57.88 kg mol⁻ 1 , Đ = 1.67, 99 % selectivity, and perfect alternating PPC. This binary system thus provides a scalable and environmentally benign route to CO 2 utilization, establishing a compelling platform for commercial PPC production with high activity, excellent selectivity, and precise alternating microstructural control.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Shuo Gao,Wanru Feng,Junsu Jin,Jianguo Mi,Hong Meng
Structured adsorbents capable of combining strong low-pressure CO 2 affinity, high selectivity, and humidity tolerance are highly desired for low-concentration CO 2 capture, yet remain difficult to realize because shaping often compromises porosity and mass transport. Here, we report a solvent-directed and nanoconfined crystallization strategy to construct millimeter-sized polyacrylate (PA)-supported Zn 2 (Mtz) 2 Ox-EG sphere (Zn 2 (Mtz) 2 Ox-EG@PA). Ethylene glycol modulates the ultramicroporous environment of Zn 2 (Mtz) 2 Ox, enhancing its low-pressure CO 2 affinity, while the confined macroporous network of the PA matrix promotes heterogeneous nucleation and suppresses free crystal growth, sharply reducing the size of the micrometer-scale MOF bulk crystals by nearly 100-fold. The resulting Zn 2 (Mtz) 2 Ox-EG@PA composite exhibits a high CO 2 uptake for 1.68 mmol g −1 at 0.05 bar and 313 K, while N 2 and CH 4 adsorption are strongly suppressed. Consequently, high IAST selectivities of 3447 for CO 2 /N 2 and 1275 for CO 2 /CH 4 are achieved at a 5/95 gas ratio. The hydrophobic MOF framework and PA matrix endow the composite with excellent hydrothermal durability, retaining framework integrity after hot-water treatment at 403 K for 7 days. Dynamic breakthrough experiments further demonstrate efficient CO 2 /N 2 separation from a 5 vol% CO 2 stream at 90% RH, highlighting the potential of nanoconfined MOF crystallization for robust structured adsorbents under humid dilute-CO 2 conditions.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Qianwen Wang,Mengjie Li,Dandan Zhang,Mingmin Jia,Xiong-Fei Zhang,Jianfeng Yao
A mixed-matrix membrane was developed by combining defect-engineered UiO-66-NH 2 metal-organic framework (MOF) and nanocellulose. A formic acid-modulated solvothermal method creates linker-missing defects in UiO-66-NH 2 , increasing its specific surface area from 540 to 775 m 2 g −1 . The hydroxyl/carboxyl-rich cellulose forms a robust hydrogen-bonding network with amino groups and defect sites on the MOF, suppressing interfacial defects. The optimized membrane achieves a CO 2 permeability of 303.7 Barrer with CO 2 /N 2 and CO 2 /CH 4 selectivities of 92.3 and 124.0, respectively. This enhancement arises from optimized adsorption sites in the defective MOF and superb MOF-cellulose interface capability coupled with efficient CO 2 transfer through the cellulose network. Moreover, the membrane exhibits good stability over 500 h tests, offering a promising approach to high-performance gas separation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Baojie Dou,Xiangyu Mei,Weijia Xue,Jiaojiao Shang,Jianwu Lan,Lihong Lao,Patrick Theato,Shaojian Lin
CO 2 -responsive materials that use CO 2 as a benign external trigger to regulate surface wettability have emerged as promising candidates for oily wastewater treatment. However, the efficient treatment of high-viscosity oils and bidirectional stable oil-in-water emulsions using CO 2 -responsive oil/water separation materials remains a significant challenge. Herein, a multifunctional CO 2 -responsive photothermal sponge (CCF@PDA-PMS) by integrating a CO 2 -switchable polymer and low-cost biomass-derived carbonized cotton fibers (CCF) into a polydopamine (PDA) modified melamine sponge (MS) was successfully fabricated. This rational design combined reversible wettability switching with efficient solar-driven self-heating in a single three-dimensional porous framework, enabling adaptive treatment of complex oily wastewater. As expected, the resulting sponge exhibited rapid CO 2 -triggered wettability switching from superhydrophobic (water contact angle of 151.7°) to superhydrophilic (0°). Meanwhile, the sponge demonstrated high adsorption capacities toward a wide range of oils, absorbing 20 to 45 times its own weight. Furthermore, under 1.0 sun irradiation, the CCF@PDA-PMS surface reached a temperature of 98.0 °C within 25 s owing to efficient photothermal conversion, which effectively reduced the viscosity of crude oil, enabling the CCF@PDA-PMS to rapidly absorb crude oil with a capacity of up to approximately 30 g g −1 . More importantly, the integrated CO 2 -responsive wettability allowed gravity-driven bidirectional separation of both water-in-oil (W/O) and oil-in-water (O/W) emulsions with separation efficiencies exceeding 98.2% while maintaining stable permeation fluxes. Additionally, the prepared sponge exhibited outstanding stability and recyclability. Overall, these multifunctional characteristics highlight the potential application prospects of the CO 2 -responsive sponge in controllable oil-water separation and the remediation of viscous oil spills.
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APPLIED SURFACE SCIENCE
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2026
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IF 6.6
Xiaohan Li,Yi Wen,Chenguang Qian,Bowen Cui,Fang Yuan,Chunquan Li,Zhiming Sun
Diatomite-induced amino coordination transformation Bi-MOF composite was prepared. • Surface silanol groups modulate Bi 3+ coordination, inducing amino ligand transformation. • The coordination transformation forms highly dispersed NH 2 -Bi-MOF nanowhiskers. • The composite shows enhanced photocatalysis, cycling stability and lower costs. Developing photocatalysts featuring outstanding catalytic activity and economic viability contributes greatly to artificial carbon cycling and addressing energy and environmental challenges. In this study, we adopted a strategy combining amino ligand modification with diatomite support to successfully synthesize amino-modified NH 2 -Bi-MOF/diatomite composites. These materials utilize the silanol groups on the diatomite surface to modulate the coordination environment of the Bi 3+ metal centers, inducing the conversion of amino ligands and promoting the formation of Bi-N bonds, thereby transforming the morphology of the NH 2 -Bi-MOF from an agglomerated state to highly dispersed nanowhiskers. The characterization results indicate that the highly dispersed structure endows the material with outstanding chemical stability, light-harvesting capability, CO 2 adsorption capacity, and carrier separation efficiency. Meanwhile, the optimal sample, NH 2 -Bi-MOF/diatomite-0.2, achieves a CO production rate of 10.440 μmol·g −1 ·h −1 , representing increases of 78% and 45% compared to Bi-MOF and NH 2 -Bi-MOF, respectively. Notably, no apparent decline in catalytic performance was observed after four cycles. Furthermore, the introduction of diatomite substantially reduces catalyst preparation costs. This study also systematically elucidates the conversion mechanism of amino ligands and the interfacial synergy between diatomite and NH 2 -Bi-MOF, clarifying the photocatalytic CO 2 reduction pathways and core mechanisms of the composite material. The findings provide new insights for the development and industrial application of highly efficient and economical photocatalysts. Download: Download high-res image (191KB) Download: Download full-size image
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Journal of CO2 Utilization
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2026
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IF 8.6
Debiao Pan,Caijin Zhou,Xiaoda Wang,Xuehui Ge
Achieved efficient CO 2 absorption in curved TiTR under counter-current flow. • Overall volumetric mass transfer coefficient up to 0.97 s −1 . • Enhancement factor of gas-liquid mass transfer reached 1.35. • Trade-off between mass transfer enhancement and energy consumption evaluated. • Empirical correlation for mass transfer coefficient with 15% error. In recent years, the substantial emission of carbon dioxide (CO 2 ) has caused increasingly severe environmental issues. In response, policies related to carbon neutrality and carbon emission reduction have been rolled out. To achieve these goals, the efficient capture of CO 2 is essential. This work systematically elucidated the gas-liquid two-phase counter-current mass transfer mechanism for an efficient CO 2 absorption process using a curved tube-in-tube reactor (TiTR), which has a wide gas-liquid contact area and a new reactor structure. The variation of CO 2 absorption efficiency and the overall gas-liquid volumetric mass transfer coefficient ( k L a ) under different experimental conditions, including curvature diameter, pitch, and liquid flow rate, was systematically examined. Through the optimization of experimental conditions, the enhancement factor of k L a , which was defined as the ratio of k L a of the curved TiTR to that of the straight TiTR, reached 1.35, and k L a was up to 0.97 s −1 . In addition, the trade-off between mass transfer enhancement and energy consumption in the CO 2 absorption enhancement process within TiTRs with different geometries was evaluated. Finally, on the basis of the experimental data, an empirical equation correlating k L a with experimental parameters was further proposed. This equation can be used to predict the gas-liquid mass transfer in TiTRs.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Chao Tang,Bing Wu,Guowei Yang,Guangjian Chai,Dian Qu,Chun Chen,Zhihong Yang,Jian Sun,Jianmei Xu,Zhiquan Chen,Qihang Wang,Wei Zhou
Metal organic frameworks (MOF) are widely incorporated into mixed matrix membranes (MMMs) for CO 2 separation. However, the relationship between MOF-induced free volume characteristics and transport behavior remains insufficiently understood. In this work, Pebax MH 1657-based MMMs were prepared using a dual ligand aluminum-based MOF (CAU-PBH), derived from CAU-10-H through partial substitution of isophthalic acid by pyridine-3,5-dicarboxylic acid, as a filler to investigate its effect on the free volume and CO 2 transport properties of the Pebax membranes. It exhibits a microporous structure and a polar chemical environment containing carboxylate and N-heterocyclic groups, which are favorable for CO 2 adsorption and polymer-filler compatibility. The optimized MMM containing 5 wt% CAU-PBH showed a CO 2 permeability of 95.10 Barrer and a CO 2 /N 2 selectivity of 66.64 at 0.2 MPa and 35 °C, approaching the 2008 Robeson upper bound. Quantitative positron annihilation lifetime spectroscopy (PALS) analysis revealed that CAU-PBH incorporation modified the free volume characteristics of Pebax through changes in polymer chain packing and crystallization behavior. The MOF-induced changes in free volume characteristics were closely associated with changes in gas diffusivity, while CO 2 solubility increased markedly. The regulated free volume characteristics, together with the intrinsic micropores and CO 2 affinity sites of CAU-PBH, enhanced CO 2 sorption and contributed to selective transport pathways, thereby improving CO 2 separation performance. These results indicate that the separation enhancement cannot be attributed to a simple change in free volume alone, establishing a PALS-based structure-transport correlation between MOF-induced free volume characteristics and CO 2 transport behavior in Pebax MMMs.
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Journal of Energy Storage
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2026
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IF 10.7
Qi Cheng,Tenghui Qiu,Jiashun Liu,Zixuan He,Hua Tian,Lingfeng Shi,Gequn Shu
Photo-assisted lithium‑carbon dioxide battery (Li-CO 2 ) can utilize the charge carriers generated at the cathode by light to reduce the kinetic barriers of carbon dioxide reduction and lithium carbonate decomposition reactions. However, rapid recombination of photogenerated carriers and sluggish interfacial charge transfer still lead to high overpotentials and limited cycle life in photo-assisted Li-CO 2 batteries. Therefore, it is crucial to design highly efficient photocatalysts that can suppress carrier recombination and accelerate interfacial charge transfer for rational optimization. Herein, we adopted the design strategy of metal ion doping and synthesized a Fe-doped ZnS (Zn 1-x Fe x S, denoted as ZFS-x) photocathode by the hydrothermal synthesis method. The doping of iron ions effectively regulates the electronic structure of ZnS, inhibits the recombination of photogenerated carriers, and accelerates the interfacial charge transfer kinetics. The photo-assisted ZFS-x cathode delivers a markedly prolonged cycling lifetime of up to 300 cycles (600 h) at a current density of 0.01 mA cm −2 , substantially exceeding that achieved under dark conditions (144 h). Furthermore, the single-cycle overpotential is significantly reduced from 2.27 V in the dark to 0.49 V under illumination. Morphology studies confirm that appropriate Fe-ion doping significantly enhances the uniformity of the discharge products, which are present as uniformly dispersed nanoscale particles rather than densely packed plate-like or aggregated structures. Moreover, their highly reversible decomposition during charging effectively mitigates pore blockage and interfacial passivation. These results indicate that the incorporation of iron can improve charge separation and regulate the formation and decomposition of Li 2 CO 3 , thereby effectively modulating the ZnS photocathode and ultimately enabling the development of photo-assisted Li-CO 2 batteries with low overpotential and long cycle life.
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APPLIED CATALYSIS A-GENERAL
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2026
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IF 4.8
Huimin Luo,Jinming Yan,Deyun Xu,Jia Guo,Mengjie Fan,Longtian Kang,Qingfu Sun
P/N-type Z-scheme heterojunction of Co-PDI/Cu-CuTCPP is prepared by a simple way. • Multifunctional photocatalytic activity of is achieved for POE, PHE and CO 2 RR. • Catalytic activities for POE and CO 2 RR increase by ~3 and ~12 times, respectively. • The overall CO 2 RR in the aqueous phase can be achieved to yield O 2 , CO and CH 4 . • It is found that Co-O-Cu linkage exists and has important role in photocatalysis. Developing a multifunctional system for photocatalytic water splitting (PWS) and carbon dioxide reduction reaction (CO 2 RR) is a promising approach to achieve the green carbon cycling. Here, the p/n-type Z-scheme heterojunction (Co-PDI/Cu-CuTCPP) between cobalt perylene diimide nanorods (Co-PDI) and copper porphyrin metal-organic framework nanosheets (Cu-CuTCPP NSs) is constructed via a cetyltrimethylammonium bromide (CTAB)-assisted physical method. Systematical characterizations prove the existence of Co–O–Cu linkage, π-π interaction, and electrostatic forces between Co-PDI and Cu-CuTCPP. The effect of Co-PDI/Cu-CuTCPP ratio on the optical, photoelectric and electrical properties, as well as multifunctional photocatalytic activity is investigated and analyzed. Under visible light irradiation (λ > 420 nm), the Co-PDI/Cu-CuTCPP composites exhibit the photocatalytic activities of water splitting to H 2 and O 2 , as well as CO 2 RR to CO and CH 4 , respectively. After optimizing photocatalytic system, the oxygen evolution rate of 18.7 mmol·g −1 ·h −1 is reached, which is a 4.4-fold compared that of pure Co-PDI. The photogenerated electron conversion efficiency during CO 2 RR is 12.9-fold higher in Co-PDI/Cu-CuTCPP than in Cu-CuTCPP. Meanwhile, the overall CO 2 RR in the aqueous phase can be achieved without H 2 production. Mechanism studies reveal the photoelectrical conversion process, and confirm the synergistic role between Co-PDI and Cu-CuTCPP. Download: Download high-res image (310KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Wei Xiang,Jia Chen,Yunbo Dong,Yue Wen,Zizhao Wang,Lin Li,Caili Dai
Multilevel CO 2 -responsive polymers with exceptional thickening performance. • SC-CO 2 triggered cationic transformation and high-temperature ion pair formation. • Synergistic coupling mechanism of chain conformational changes and dynamic networks. • SC-CO 2 induced an 8.3-fold viscosity increase of 0.5 wt% PAAHD within 10 min. • PAAHD demonstrated exceptional CO 2 -blocking efficacy, EOR was 18.56%. Existing CO 2 channeling-control strategies that rely on a single protonation-triggered mechanism to regulate polymer conformation through hydrophilic-hydrophobic microdomain evolution are often severely constrained under harsh reservoir. Therefore, breaking away from the conventional single-response paradigm, this study synthesizes a multilevel CO 2 -responsive polymer, PAAHD. In a supercritical CO 2 (SC-CO 2 ) conditions, the viscosity of a 0.5 wt% PAAHD solution sharply increased from 68.31 ± 2.10 mPa·s to 665.37 ± 18.40 mPa·s within 10 min. Even under a high mineralization of 10 × 10 4 mg/L, the system maintained a viscosity of 254.66 ± 7.60 mPa·s, far exceeding the previously reported value of 55.40 mPa·s. This significant viscosity enhancement originates from the synergistic construction of a protonation-induced dense hydrogen bonding network (with hydrogen bonding content increasing from 16.65% to 54.08%) and an ionic crosslinking physical network. Specifically, the reversal of Zeta potential from −10 mV to +24 mV, accompanied by an order-of-magnitude increase in electrical conductivity, indicates the transition of polymer chains to a positively charged state and a significant increase in ionic crosslinking density. This pronounced gelation transition is reflected in core displacement experiments as a 32-fold increase in injection pressure and an 18.56 ± 1.20% enhancement in oil recovery. This dual-mechanism synergistic responsive strategy provides an innovative solution for intelligent profile control. Download: Download high-res image (350KB) Download: Download full-size image
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Nature Communications
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2026
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IF 18.1
Xia Shuai,Tan Hao,Zhang Jianfang,Han Miao,Xu Chang,Yu Cuiping,Chen Kui,Zhang Yong,Wu Yucheng,Wang Yan
The electrocatalytic synthesis of amides from abundant small molecules offers a sustainable route for green chemical production, yet faces fundamental challenges due to kinetic competition between C–C and C–N bond formation. Here we show an atomically engineered dual-site catalyst featuring nickel single atoms adjacent to copper nanoclusters (Ni-SA/Cu-NCs) on a nitrogen-doped carbon matrix for efficient CO 2 and NO 3 − co-reduction to acetamide. This architecture enables complementary functions, with Ni sites selectively converting CO 2 to CO and neighboring Cu nanoclusters promoting C–C coupling to form the *CCO intermediate while concurrently reducing NO 3 − to form the *NH 2 intermediate. The resulting synergy facilitates rapid intermediate transfer and C–N coupling, delivering an acetamide yield rate of 257.3 mmol h −1 g cat . −1 at an industrial current density of 215.7 mA cm −2 , with stable operation over 160 h. In situ spectroscopic studies and theoretical calculations suggest that strong Ni–Cu electronic coupling promotes reactant adsorption and reduces the activation barriers for critical steps, including *CO dimerization and *CCO–*NH 2 coupling. This work provides an atomic-level design strategy for multi-site catalysts to steer complex electrocatalytic reactions toward value-added products.
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Dan Wu,Yanni Lang,Liang Xu,Qiyuexin Wang,Qiu Fu,Bingli Li,Xinye Zhao,Zhaoyi Yin,Yongjin Li,Dacheng Zhou,Yangke Cun,Zhiguo Song,Yugeng Wen,Yong Yang,Jin Han,Jianbei Qiu
The circular dichroism (CD) signal of D-BiOBr/Bi 0.3 g flipped and intensified. • The nanosheets of D-BiOBr/Bi 0.3 g were arranged in a spiral (counterclockwise) manner, forming petal-shaped nanospheres. • 0.3 g D-BiOBr/Bi exhibits a CO production rate of 84.27 μmol・g −1 h −1 , 3.34 times the value of D-BiOBr and 4.00 times that of 0.3 g pristine BiOBr/Bi sample. • LSPR boosts the migration of spin−down polarized electrons and improves the separation efficiency of photogenerated electron−hole pairs. Chiral inorganic nanomaterials have shown considerable promise in photocatalysis, owing to their distinctive optical activity and asymmetric interfacial effects. Metallic bismuth (Bi) exhibits a localized surface plasmon resonance (LSPR) effect, which markedly enhances both the generation and separation efficiencies of photogenerated electron-hole pairs. By employing D-sorbitol as a chiral inducer, we successfully synthesized chiral D-BiOBr/Bi nanocomposites. We propose that the synergistic integration of metallic Bi and chiral BiOBr enables effective modulation of chirality-induced spin selectivity (CISS), thereby enhancing spin polarization and promoting CO production from CO 2 reduction. Among the prepared samples, D-BiOBr/Bi 0.3 g exhibited the highest photocatalytic CO 2 reduction activity, selectively converting CO 2 to CO. The CO production rate of D-BiOBr/Bi 0.3 g was 84.27 μmol g −1 h −1 , which was 4.00 times and 3.34 times that of BiOBr/Bi 0.3 g and D-BiOBr respectively. Furthermore, magnetic conductive atomic force microscopy (Mc-AFM) measurements revealed that D-BiOBr/Bi 0.3 g generated the strongest tunneling current with an opposite polarity compared to its controls, providing indirect evidence for CISS-associated spin-selective charge transport. Collectively, our findings demonstrate a strong coupling between the LSPR of metallic Bi and structural chirality, which cooperatively boosts spin-polarized electron generation, accelerates electron-hole pair separation, and significantly improves photocatalytic CO 2 reduction performance.
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