JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
·Vol. 71
·期 8
·3669-3680
·
IF 2.4
Wu Shasha,Li Wenyu,Yang Li,Chen Zhen,Qin Yuanhang,Yuan Lunyong,Sun Wei
This study systematically investigates the influence
of lithium
nitrate (LiNO 3 ) modification on the gas adsorption characteristics
of UiO-66. The adsorption isotherms for carbon dioxide (CO 2 ), methane (CH 4 ), and nitrogen (N 2 ) were acquired
within a pressure range of 0 to 20 bar. The results from the cyclic
testing indicate that the UiO-66–0.05LiNO 3 variant
exhibits commendable stability. Notably, the incorporation of LiNO 3 enhances the CO 2 adsorption capacity by 29.48%,
reaching 2.24 mmol·g –1 at a pressure of 1 bar.
This is attributed to the introduction of lithium ions, which enhance
the electrostatic interaction between CO 2 and the MOF.
Analysis of the high-pressure data reveals that the Langmuir–Freundlich
model provides the most robust fit, whereas the Langmuir and Dual-site
Langmuir models demonstrate increased discrepancies as pressure escalates.
According to calculations based on the Ideal Adsorption Solution Theory
(IAST), the maximum selectivity of the material for the CO 2 /CH 4 and CO 2 /N 2 mixtures is 11.5
and 56.0, respectively. These results suggest that LiNO 3 modification significantly enhances both the adsorption capacity
and the selectivity for CO 2 separation.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122841
·
IF 7.5
Mian Zhu,Chao Lyu,Xieding Sun,Xiaochuan Yang,Jingxian Liu
To develop high-efficiency carbon dioxide (CO 2 ) adsorbents featuring low-pollution and low-energy-consumption preparation, gel bead precursors were first fabricated via gelation of nanocellulose, polyvinyl alcohol (PVA), and 2-methylimidazole. A nitrogen-doped precursor derived from hydrothermal recrystallization of melamine and dextrin was uniformly incorporated into the gel matrix to construct a nitrogen-enriched system. Subsequently, ZIF-8 was grown in situ within the composite beads through immersion in a zinc ion solution, yielding a biomass-polymer@ZIF-8 support after drying, which was then carbonized under N 2 to produce nitrogen-doped porous carbons. Based on static CO 2 adsorption evaluations across 15 sample sets at 0 ℃ and 25 ℃, 800 °C was identified as the optimal carbonization temperature. The sample CZN-II-800, with 4.31% external nitrogen doping in the precursor, exhibited absolute CO 2 adsorption capacities of 3.39 mmol/g at 0 ℃ and 3.08 mmol/g at 298 K (1 bar), which was 66.5% higher than that of its nitrogen-free counterpart CZ-800. Additionally, it displayed a CO 2 /N 2 selectivity coefficient of 8.9 under dynamic competitive adsorption conditions at 1 bar and 298 K. This work therefore establishes a scalable hybrid route integrating biomass materials with ZIFs to design high-performance adsorbents for efficient CO 2 capture from flue gases.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Runlin Han,Faxiang Feng,Zanming Zhu,Guilin Dong,Xiaobing Liu,Minggang Guo,Xiaohang Yang,Jiahao Qin,Huahao Wang,Yan Dai,Gaohong He
Metal-organic frameworks (MOFs) based Mixed-matrix membranes (MMMs) still present challenges in overcoming the traditional trade-off between permeability and selectivity in gas separation. Functionality of MOFs demonstrates great potentials in overcoming this issue. In this study, hierarchically structured multifunctional C@Fe 2 O 3 @ZIF-8 was proposed to construct strong adsorbed and low-resistance transport pathways enabling high CO 2 sieving through a “selective thermal etching” strategy. Leveraging the thermal stability difference between MIL-88 A(Fe) and ZIF-8, the core undergoes selective pyrolysis while preserving the crystalline ZIF-8 shell. The ZIF-8 shell enhances CO 2 /N 2 separation while optimizing interfacial compatibility, whereas the porous carbon core provides mesoporous structures for enhanced gas transport and ultramicroporous regions for improved CO 2 adsorption. Meanwhile, paramagnetic Fe 2 O 3 in the core layer enables optimized distribution of C@Fe 2 O 3 @ZIF-8 within the Pebax matrix. The C@Fe 2 O 3 @ZIF-8/Pebax MMM exhibits 216.46 % and 65.12 % improvements in CO 2 permeability and CO 2 /N 2 selectivity, respectively, over the Pebax matrix, exceeding the 2019 McKeown upper bound. This study pioneers a novel approach for constructing advanced multicomponent materials with customizable hierarchical structures by synergistically integrating high-throughput carbon channeling with MOFs molecular sieving technology.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Shaohui Xiong,Xingyi Ou,Qingquan Liu,Yiwen Li,Juntao Tang,Guipeng Yu,Chunyue Pan,Shibo Guo,Sitong Li,Menghan Yong
Polymers of intrinsic microporosity (PIM) have attracted considerable attention in the development of mixed matrix membranes (MMMs) for CO 2 separation. A prominent challenge lies in engineering the spacing of the polymer matrix chains while eliminating non-selective interfacial defects. In this study, a CO 2 -philic triazine-based porous polymer, featuring robust hydrogen bond donating groups, was employed to fabricate a series of interfacial defect-free PIM-1 based MMMs (denoted as PIM-1/CSU-1). The interfacial adhesion and compatibility have been greatly improved due to the strengthened hydrogen bond interaction, which was systematically validated through variable-temperature infrared spectroscopy. Additionally, the formation of hydrogen bonds allowed for the regulation of the polymer matrix chain spacing, making the chain distance loose. Remarkably, the resulting membrane exhibited a CO 2 permeability of 13,429 Barrer and CO 2 /N 2 selectivity of 33.1—246.6% and 70.2% higher than pristine PIM-1, respectively, surpassing the latest Jansen/McKeown upper bound established in 2019, but also significantly exceed the performance of previously reported MMMs for CO 2 separation. The strategy of mitigating interfacial defects through the formation of hydrogen bonds between fillers and the polymer matrix emerges as a viable and effective method for fabricating gas separation membranes with exceptional separation capabilities.
研究领域:
材料科学
·
高分子化学
·
气体分离
·
膜技术
·
物理化学
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Frontiers of Materials Science
·
2024
·Vol. 18
·期 4
·1-14
·
IF 2.5
Rong Xinshan,He Yuqing,Gao Ping,Sun Ting,Zhou Xiangtong,Wu Zhiren
The utilization of photocatalytic nitrogen fixation, a process celebrated for its environmental friendliness and sustainability, has emerged as a promising avenue for ammonia synthesis. The rational design of photocatalysts containing single atoms and heterojunctions has been a long-standing challenge for achieving efficient nitrogen fixation. This study innovatively constructs composite catalysts integrating single-atom copper within metal–organic frameworks (Fe-MOF, NH 2 -MIL-101) and carbon nitride nanosheet (CNNS). The nitrogen fixation efficiency of the Cu@MIL-CNNS heterojunction was 8 and 12 times those of the original MOF and CNNSs, respectively. Through detailed characterization, we unveil a unique charge transfer pathway facilitated by the synergy between single-atom copper and heterojunctions, highlighting the critical function of copper centers as potent active sites. Our findings underscore the transformative potential of single atomic sites in amplifying charge transfer efficiency, propelling advancements in the photocatalyst design.
研究领域:
材料科学
·
环境科学
·
化学
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Lifang Deng,Lufeng Wang,Guoqiang Wei,Haoran Yuan,Jun Xie,Yong Chen
Electrocatalytic reduction of N 2 to ammonia (NH 3 ) at ambient conditions has attracted widespread attention, and revealing the mechanism has been a remarkably challenging problem for decades. This work developed a low-cost and efficient multiple heteroatom codoped porous carbon catalyst from municipal sludge (MSB-P), which demonstrated excellent electrochemical stability and selectivity for the electrochemical N 2 reduction reaction (N 2 RR). In 0.1 mol/L HCl solution, a high NH 3 yield rate of 35.76 µg. h − 1 .mg −1 cat. and an excellent Faraday Efficiency (FE) of 7.79% at -0.7 V vs. RHE (reversible hydrogen electrode) were obtained under ambient conditions. Furthermore, the electrocatalytic mechanism of MSB-P for N 2 RR was also revealed by in situ Fourier transform infrared spectroscopy (FTIR) data, and an associative route was identified. These findings provide an exciting new method for fabricating inexpensive and efficient carbon-based catalysts for production of NH 3 at ambient conditions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Wenjia Luo,Zhenhua Niu,Peng Mu,Jian Li
Membrane separation systems have received extensive attention in the field of gas separation due to its low cost, high-efficiency and eco-friendly advantages. However, it is till challenging to break through the trade-off effect for a highly efficient membrane separation process. Herein, a high-performance CO 2 -philic MXene/PEG mixed matrix membrane is prepared by a simple vacuum filtration process. Excellent CO 2 permeance and selectivity in separation of the CO 2 /N 2 and CO 2 /CH 4 is shown for the as-prepared MXene/PEG (600) mixed matrix membrane because of CO 2 -philic property of the PEG and the nanochannels of the MXene . In permeation experiment, exceptional CO 2 permeance of 1626.99 GPU and ideal selectivity of 32.18 for CO 2 /N 2 and 27.84 for CO 2 /CH 4 , is exhibited, respectively, for 25 wt% MXene/PEG (600) mixed matrix membrane. This study provides a new strategy for design and fabrication of the CO 2 -philic MXene-based membrane with highly efficient separation of the CO 2 from natural gas and flue gas.
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Materials Today Communications
·
2022
·
IF 3.662
Shaocan Dong,Weiqiu Huang,Xufei Li,Xinya Wang,Baoyou Yan,Zhen Zhang,Jing Zhong
In response to global climate change, most countries have set carbon reduction targets. Mixed matrix membranes (MMMs), which combine the characteristics of inorganic nanofillers and organic matrices, have received wide attentions because of their good permeability and selective performance for the separation of CO 2 from industrial waste gases. However, the poor dispersion, compatibility and interfacial defects often lead to poor gas separation performance. In this paper, according to the dissolution-diffusion and Lewis acid-base theories, inorganic filler of amino-functionalized Bentonite (APTES-Bentonite) with -NH 2 was firstly synthesized to improve the affinity of CO 2 . Then, the dual-functionalized MMMs of APTES-Bentonite/PVDF (A-B/P MMMs) was prepared and adopted for the separation of CO 2 /CH 4 and CO 2 /N 2 , showing the increase of 87.76% and 75.31% compared to the pristine PVDF membrane, respectively. These excellent performances were attributed to the synergistic effect of APTES-Bentonite with -NH 2 groups and PVDF with -F groups, which provide a dual-functional transport pathway for CO 2 molecules due to the interactions of host-guest. Overall, the customized A-B/P MMMs offer superior CO 2 separation performance, which provides some valuable references for large-scale CO 2 capture studies.
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Dekun Shi,Zhaojun Shi,Lixin Zhang,Yaan Cao
A series of halogen ions (Cl − , Br − , or I − ) modified Bi 2 MoO 6 (Bi 2 MoO 6 –Cl, Bi 2 MoO 6 –Br, or Bi 2 MoO 6 –I) are synthesized via a one-step solvothermal method . It is determined that the halogen ions (Cl − , Br − , or I − ) are modified on the surface of Bi 2 MoO 6 as the -Bi-Cl, -Bi-Br, or -Bi-I species (the connected Bi 3+ is coordinated with three lattice O2- ions in Bi 2 MoO 6 ). The -Bi-Cl, -Bi-Br, or -Bi-I species on the Bi 2 MoO 6 surface can act as highly active sites to polarize and activate the N 2 and H 2 O molecules adsorbed on the surface of catalysts. Moreover, due to the surface-modified -Bi-Cl, -Bi-Br, or -Bi-I species, the visible light absorption is improved, the separation of photogenerated charge carriers is promoted, as well the band structure is better matched with the redox potential of photoreduction of N 2 . As a result, the photocatalytic activity of Bi 2 MoO 6 –Cl, Bi 2 MoO 6 –Br, or Bi 2 MoO 6 –I is improved for photoreduction of N 2 into NH 3 compared with Bi 2 MoO 6 . Overall, this work provides new insights into the doping states of halogen ions, the surface-active sites, the band structure, the photocatalytic activity, and the mechanism for photoreduction of N 2 into NH 3 for Bi 2 MoO 6 with modification of halogen ions (Cl − , Br − , or I − ).
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yifan Li,Yaqin Hou,Yongzhao Zhang,Yatao Yang,Zhanggen Huang
Surface interface regulation is an important research content in the field of heterogeneous catalysis. To improve the interface interaction between the active component and matrix, tremendous efforts have been dedicated to tailoring the morphology, size, and structure of composite catalysts. In this work, we report a confinement strategy to synthesize a series of core-shell catalysts loaded with metal oxides on titania nanotubes (TNTs), which were applied to the selective catalytic reduction of NO x with ammonia. Interestingly, the core-shell catalyst with confinement of TNTs exhibited the remarkable activity at low temperature region, N 2 selectivity and sulfur tolerance. Benefiting from the superior interfacial confinement characteristic of TNTs and Fe 2 O 3 , strong component interactions, the surface acid sites and strong oxidizability of MnO x were properly regulated, thus obtained the outstanding activity, N 2 selectivity and provide chemical protection to effectively prevent SO 2 poisoning. As far as the reaction mechanism, we found that the adsorption and reactivity of Lewis acid sites were the dominant factors affecting the activity in the NH 3 -SCR process by in situ DRIFT spectra. In general, our work provides an innovative strategy for constructing an TNTs-enwrapped nanocomposite with nano-confinement and core-shell structure to improve the low temperature SCR process.
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AICHE JOURNAL
·
2020
·Vol. 67
·期 4
·e17114
·
IF 3.519
Ihtisham Ul Haq,Tao Wang,Ao-Shuai Zhang,Heng Mao,Rehan Khan,Li-Hao Xu,Zhi-Ping Zhao
1,3-Butadiene (BD) is a petrochemical-based volatile organic compound, extensively used for the manufacture of synthetic rubber. There is no method reported for its recovery from nitrogen mixture. Herein, for the first time, BD is efficiently recovered by gas separation through facile and novel mixed-metal ZIF-8 based mixed matrix membranes (MMMs). Addition of Ni-ZIF-8 nanoparticles in PDMS matrix, significantly improved the penetrant-membrane interactions and the solution-diffusion properties of BD. Positron annihilation lifetime spectroscopy analysis showed that the well dispersion of Ni-ZIF-8 in PDMS enhanced the free volume of membrane and created efficient continuous paths for BD diffusion. Then, 15 wt% Ni-ZIF-8 MMM exhibited the BD permeance of 323 GPU and the BD/N 2 ideal selectivity of 19.5, which were 60 and 81% higher than pure PDMS membrane, respectively. The simultaneous enhancement of BD permeance and BD/N 2 ideal selectivity indicated that Ni-ZIF-8 was an effective filler applied in MMMs for efficient BD recovery.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 26
·12041-12052
·
IF 3.553
Yi Xuerui,He Xiaobo,Yin Fengxiang,Yang Tong,Chen Biaohua,Li Guoru
The global NH 3 production is dominated by Haber–Bosch process, requiring high temperature and pressure. Electrochemical N 2 reduction reaction (NRR) under ambient conditions is a greener path for artificial N 2 fixation to NH 3 but calling for efficient catalyst to increase activity and selectivity. Herein, we report the iron-based metal–organic frameworks (MOFs), i.e., MIL-88B–Fe and amine-functionalized MIL-88B–Fe (NH 2 –MIL-88B–Fe) as efficient catalysts for electrochemical NRR under ambient temperature and pressure in neutral electrolyte. NH 2 –MIL-88B–Fe shows higher NH 3 yield rate of 1.205 × 10 –10 mol s −1 cm −2 than MIL-88B–Fe (3.575 × 10 –11 mol s −1 cm −2 ). Furthermore, NH 2 –MIL-88B–Fe exhibits the highest Faradaic efficiency of 12.45% at 0.05 V versus RHE. The control experiments prove that NH 3 is produced through electrocatalytic NRR. This work may trigger the interest of using MOFs as highly efficient catalysts for electrochemical NH 3 production.
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