JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Po-Chun Wu,Ho Jun Lee,Yi-Fan Lin,Kuo-Lun Tung,Jong Suk Lee,Dun-Yen Kang
Carbon capture is widely recognized as a pivotal technology for alleviating the accelerating impacts of global warming. Mixed matrix membranes (MMMs) that embed metal organic frameworks (MOFs) offer a compelling route to high-performance separations, and MOF-808 stands out among them because of its outstanding chemical stability and environmentally friendly synthesis. In this study, the defect density of MOF-808 was tuned by varying the formic acid modulator: Higher modulator loading produced MOF-808 with higher linker defect density. After synthesis, MOF-808 was washed with either water or ethanol and then incorporated into PEBAX matrix through a drying-free process that ensured uniform dispersion. Washing with ethanol altered the pore coordination environment of MOF-808, partially replacing formate with ethoxide. Introducing an appropriate amount of formic acid created additional open metal sites and increased both CO 2 permeability and CO 2 /N 2 selectivity; however, excessive formic acid produced too many defects, causing severe pore blockage and consequently lowering the CO 2 permeability. The drying-free method, by preventing MOF aggregation and ensuring homogeneous dispersion, led to a 38 % increase in CO 2 /N 2 selectivity compared with the conventional drying method. The ethoxide substitution induced by ethanol washing occupied part of the pore volume, leading to a reduction in CO 2 permeability. The optimized MOF-808/PEBAX MMM achieved a CO 2 permeability of 150 Barrer and a CO 2 /N 2 selectivity of 76.4, both markedly higher than those of the pristine polymer. These results highlight a sustainable, scalable strategy for producing high-efficiency membranes for post-combustion CO 2 capture.
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产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 38
·22460-22467
·
IF 3.119
Jiehong He,Pin Lv,Jian Zhu,Hexing Li
Selective photocatalytic reduction of CO2 has been regarded as one of the most amazing ways for re-using CO2. However, its application is still limited by the low CO2 conversion efficiency. This work developed a novel Pt/In2O3/g-C3N4 multifunctional catalyst, which exhibited high activity and selectivity to HCOOH during photocatalytic CO2 reduction under visible light irradiation owing to the synergistic effect between photocatalyst, thermocatalyst, and heterojunctions. Both In2O3 and g-C3N4 acted as visible photocatalysts, in which porous g-C3N4 facilitated H2 production from water splitting while the In2O3 nanosheets embedded in g-C3N4 pores favored CO2 fixation and H adsorption onto the Lewis acid sites. Besides, the In2O3/g-C3N4 heterojunctions could efficiently inhibit the photoelectron–hole recombination, leading to enhanced quantum efficiency. The Pt could act as a co-catalyst in H2 production from photocatalytic water splitting and also accelerated electron transfer to inhibit electron–hole recombination and generated a plasma effect. More importantly, the Pt could activate H atoms and CO2 molecules toward the formation of HCOOH. At normal pressure and room temperature, the TON of HCOOH in CO2 conversion was 63.1 μmol g−1 h−1 and could reach up to 736.3 μmol g−1 h−1 at 40 atm.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Ghazala Zainab,Aijaz Ahmed Babar,Nadir Ali,Ahmed A. Aboalhassan,Xianfeng Wang,Jianyong Yu,Bin Ding
Hypothesis Carbonaceous materials are believed to be excellent source for developing essential vessels for carbon dioxide (CO 2 ) adsorption. However, most of the carbonaceous materials used for CO 2 capture have particle form, which is hard to recycle and also may cause choking of the gas pipes. Additionally, they also either require chemical activation or attachment of any functional groups for proficient CO 2 capture. Thus, facile fabrication of multi-aperture porous carbon nanofiber (CNF) based CO 2 sorbent via combination of three simple steps of electrospinning, washing, and carbonization , may be an effective approach for developing efficient sorbents for CO 2 capture. Experiment PAN/PVP composite solution was electrospun , PVP was used as pore forming template and PAN was opted as nitrogen rich precursor for carbon during electrospinning process . Selective removal of PVP from the electrospun PAN/PVP fiber matrix prior to carbonization generated highly rough and extremely porous PAN nanofibers , which were then carbonized to develop multi-aperture/opening porous carbon nanofibers (PCNF) with ultra-small pores with average pore diameter of ~0.71 nm. Findings Synthesized PCNF exhibited high CO 2 gas selectivity (S = 20) and offered superior CO 2 adsorption performance of 3.11 mmol/g. Moreover, no apparent change in mass for up to 50 cycles of CO 2 adsorption/desorption unveil the long-term stability of synthesized PCNF, making them a potential candidate for CO 2 adsorption application.
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DOI
高影响因子
ENERGY & FUELS
·
2016
·
IF 2.835
Qiangwei Li,Yi Wang,Shanlong An,Lidong Wang
Using a K2CO3/piperazine (PZ) mixture as a typical phase-change absorbent has promising applicability for carbon dioxide (CO2) capture in coal-fired power plants that would contribute to low energy consumption for solvent regeneration. In this study, the reaction rate of CO2 with a concentrated K2CO3/PZ mixture was measured in a wetted-wall column. At a CO2 loading close to saturation absorption, correlative physical parameters were calculated. The effects of operating conditions, including gas flow rate, slurry flow rate, PZ concentration, CO2 loading, K2CO3 mass fraction, and temperature, on the absorption rate of CO2 were investigated. The results showed that the absorption rate was sensitive to the effects of the gas flow rate and CO2 loading. The PZ concentration and K2CO3 mass fraction also substantially influenced the CO2 absorption rate. However, minor changes in the CO2 absorption rate were observed when the slurry flow rate and temperature were increased. On the basis of a pseudo-first-order model, the absorption rate determined in this study was found to be controlled by mass transfer in both the gas film and the liquid film. The results can serve as a useful reference for designing CO2 removal systems using K2CO3/PZ mixtures.
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DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Meisi Chen,Mengjia Li,Feng Zhang,Xingbang Hu,Youting Wu
With the catalytic induction of ethylene glycol (EG), anhydrous N,N-dimethylethanolamine (DMEA) shows CO2 absorption performance via chemical binding and physical storage under normal pressure. Among the absorbents, pure DMEA and EG can hardly absorb CO2 directly, but when the zwitterionic alkylcarbonates are formed between CO2 and DMEA-EG, which can be characterized by 13C NMR and FTIR spectroscopy, the absorption rate of CO2 is improved. With the increase in the CO2 loading as the mass fraction of EG in DMEA–EG, 80 wt % EG captures up to 0.72 mol/mol at 293 K and 101 kPa via chemical binding and physical storage. The amount that is chemically bound and physically stored is directly dependent on temperature; within the range of 293–323 K, an absorption–regeneration cycle can be formed in a closed vessel because the zwitterion DMEA–EG–CO2 is unstable at higher temperatures. In other words, DMEA–EG–CO2 can be easily regenerated upon appropriate depressurization or heating. The corresponding thermodynamic calculations prove that the regenerative energy of DMEA–EG–CO2 is −27.33 kJ/mol, far less than that of other absorbent systems.
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 9
·3933-3950
·
IF 3.3
Li Xiaojun,Xia Yudong,Xu Yangzhou,Li Haitao,Huang Jiangchao,Yao Jie,Zhao Heng,Gao Xinhua,Yu Jinghao,Guo Lisheng,Li Jie
Thermocatalytic conversion of redundant CO 2 to useful methanol is an attractive route to address both energy and environmental crises simultaneously. However, existing copper/oxide catalysts widely used in these thermocatalytic processes still suffer from low methanol yield under mild reaction conditions. In this work, we design inverse oxide/Cu catalysts to achieve superior thermal catalytic performance for CO 2 hydrogenation. The optimized ZnO/Cu-1.0 catalyst exhibits maximum CH 3 OH selectivity of 83.4% and space–time yield (STY) of \(170.9\;{\text{g}}_{{{\text{CH}}_{3} {\text{OH}}}} \;{\text{kg}}_{{{\text{cat}}}}^{ - 1} \;{\text{h}}^{ - 1}\) in CO 2 hydrogenation at 210 °C, nearly twofold higher STY than the previous optimal inverse ZnO/Cu catalysts ( \(89.6\;{\text{g}}_{{{\text{CH}}_{3} {\text{OH}}}} \;{\text{kg}}_{{{\text{cat}}}}^{ - 1} \;{\text{h}}^{ - 1}\) at 250 °C). Importantly, ZnO/Cu-1.0 catalyst displayed not only a satisfactory catalytic stability but also a superior CH 3 OH STY with a time-on-stream of 24 h. Such inverse configuration of catalysts will pave the way for new strategies to design high-performance thermocatalytic catalysts and promote their commercialization. Graphical abstract Typical inverse ZnO/Cu-1.0 catalysts have been demonstrated and achieved to significantly facilitate the activation of inert CO 2 molecules to produce methanol, due to its special physicochemical properties and strong ZnO–Cu interaction
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DOI
高影响因子
Journal of Nanomaterials
·
2020
·Vol. 2020
·期 1
·1508574
·
IF 1.98
Fujiao Song,Yan Cao,Yunxia Zhao,Ruiyu Jiang,Qi Xu,Jinlong Yan,Qin Zhong
Li + - and Na + -exchanged ZIF-67 was synthesized by a new one-step method of ion as-exchange technique and tested as CO 2 adsorbents. As a comparison, the standard ion-exchange procedure was also carried out. The powder X-ray diffraction (XRD), scanning electronic microscope (SEM), particle size analyzer (PSD), and thermal gravimetry analysis (TGA) were used to investigate the effect of ion-exchange techniques on the structure of the materials. CO 2 uptake of ZIF-67 ion exchanged by one-step method is much higher than that by the standard ion-exchange procedure. All of the adsorption isotherms show linear patterns with stable adsorption rate from 0 bar to 1 bar, which reveals the materials could get excellent adsorption performance at higher pressure range (>1 bar). Elemental analysis, N 2 physical adsorption, and the point of zero charge (PZC) were carried out to confirm the adsorption mechanism. van der Waals interaction determined by the surface area and coordination interaction resulting from electrostatic interaction work in synergy to enhance CO 2 adsorption performance of ZIF-67 ion exchanged by the one-step method.
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DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 36
·期 3
·187-193
·
IF 1.852
Qing-Ning Zhao,Qing-Wen Song,Ping Liu,Qian-Xia Zhang,Jun-Hua Gao,Kan Zhang
The production of fine chemicals using CO 2 as C 1 building block through inexpensive heterogeneous catalysts with high efficiency under low pressure is challenging. Herein we propose for the first time the utilization of a multifunctional heterogeneous zinc-modified HZSM-5 (ZnHZSM-5) catalyst for upgrading CO 2 by incorporation into cyclic carbonates from CO 2 and epoxides. Owing to the nice surface properties such as abundant Lewis acid, Brønsted acid and Lewis base sites, large surface area, and plenty of micropores, CO 2 could be concentrated and well activated in ZnHZSM-5 verified by CO 2 -TPD, TG-MS, etc . Meanwhile, the epoxides were also activated through metal center and hydrogen bond. Therefore, the reaction can easily assemble at the catalyst interface and show exceptional performance, affording the aimed products with high yield of up to 99% in the presence of commercial tetra- n -propylammonium bromide (90% in kilogram scale with 0.004 mol% ZnHZSM-5 and 0.015 mol% n Pr 4 NBr).
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2012
·
IF 3.85
Juan Zhao,Zhi Wang,Jixiao Wang,Shichang Wang
Polyaniline nanofibers, netlike polyaniline nanofibers and polyaniline nanosheets were prepared by chemical oxidative polymerization. Scanning electron microscopy (SEM) was employed to characterize morphology of the polyaniline (PANI) nanoparticles . The nanocomposite membranes were prepared by blending PANI nanoparticles with polyvinylamine (PVAm) as the active layer and polysulfone (PS) as the support layer. The surface and cross-section morphology and crystallization of nanocomposite membranes were measured by SEM and XRD. The permselectivity of nanocomposite membranes was investigated by the pure CO 2 and N 2 gases and gas mixture containing 20 vol.% CO 2 and 80 vol.% N 2 . The results demonstrate that the inclusion of the PANI nanoparticles to PVAm increases the gas permeance and selectivity of the membranes due to chain packing disruption of PVAm and N 2 barrier property of PANI nanoparticles. The influences of PANI nanoparticles, PVAm and the interaction between PANI and PVAm on gas transport properties of nanocomposite membranes have been discussed. At CO 2 partial pressure of 0.02 MPa, the nanocomposite membrane containing 17 wt.% PANI nanosheets displayed a CO 2 permeance of 1200 GPU and a CO 2 /N 2 selectivity of 120. The permeance increased about 852% and the selectivity increased about 137% compared with the PVAm/PS membrane. The separation performance stability of the PVAm/PS membrane and PANI–PVAm/PS membrane was investigated and no deterioration in membrane permselectivity was observed.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huiyuan Li,Jiabin You,Xiaojing Cheng,Xiaohui Yan,Shuiyun Shen,Junliang Zhang
Pt alloy electrocatalysts (e.g., Pt 3 Co) for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs) have attracted a great deal of interest from worldwide researchers in past decades, due to the excellent ORR activity and cost-effective properties. However, the long period operation would yield sever dissolution of the non-precious metal which effects the ionomer microstructure, thus leading to significantly decreased ORR activity of catalyst and aggravated of the oxygen transport resistance in cathode catalyst layers (CCLs), especially the local oxygen transport resistance caused by the ultrathin ionomer film covering on catalyst surface. Herein, in this paper, the effects of Co 2+ contamination on structure of ionomer films and the corresponding local oxygen transport behavior in CCLs are explored via physicochemical characterizations and molecular dynamics (MD) simulations, limiting current method, as well as fuel cell performance measurement. It is found that Co 2+ contamination reduces water content and increases the modulus of the ultrathin ionomer film, while reducing the distance between the sulfonic acid groups and increasing the aggregation size of the ionomer, which is related to the volume of hydrophilic domains. Additionally, the electrochemical measurement results demonstrate that as the degree of Co 2+ contamination increases from 0 to 85 %, the local oxygen transport resistance increases from 27.74 s cm −1 to 42.43 s cm −1 , and the peak power density of fuel cell reduces from 510 mW cm −2 to 453 mW cm −2 . The reason behind lies on that contaminated Co 2+ tends to connect with sulfonate, then suppress the ionomer mobility and dislocate the local oxygen transport channels.
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高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·5031-5039
·
IF 9.5
Li Wenxiang,Gao Shuo,Yang Chuanruo,Yang Juntao,Nisar Amjad,Xiang Guolei,Jin Junsu
In 2 O 3 is an effective electrocatalyst to convert CO 2 to formic acid (HCOOH), but its inherent poor electrical conductivity limits the efficient charge transfer during the reaction. Additionally, the tendency of In 2 O 3 particles to agglomerate during synthesis further limits the exposure of active sites. Here we address these issues by leveraging the template effect of graphene oxide and employing InBDC as a self-sacrificing template for the pyrolysis synthesis of In 2 O 3 @C. The resulting In 2 O 3 @C/rGO-600 material features In 2 O 3 @C nanocubes uniformly anchored on a support of reduced graphene oxide (rGO), significantly enhancing the active sites exposure. The conductive rGO network facilitates charge transfer during electrocatalysis, and the presence of oxygen vacancies generated during pyrolysis, combined with the strong electron-donating ability of rGO, enhances the adsorption and activation of CO 2 . In performance evaluation, In 2 O 3 @C/rGO-600 exhibits a remarkable HCOOH Faradaic efficiency exceeding 94.0% over a broad potential window of −0.7 to −1.0 V (vs. reversible hydrogen electrode (RHE)), with the highest value of 97.9% at −0.9 V (vs. RHE) in a H-cell. Moreover, the material demonstrates an excellent cathodic energy efficiency of 71.6% at −0.7 V (vs. RHE). The study underscores the efficacy of uniformly anchoring metal oxide nanoparticles onto rGO for enhancing the electrocatalytic CO 2 reduction performance of materials.
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 41
·期 2
·685-691
·
IF 3.277
Kaisi Liu,Bin Yao,Yongfeng Li,Zhanhui Ding,Zhenyu Xiao,Yuhong Jiang,Gang Wang,Daocheng Pan
Cu2CoSnS4 (CCTS) and Cu2NiSnS4 (CNTS) can be regarded as Cu2ZnSnS4 compounds with the Zn2+ replaced by Co2+ and Ni2+, and are alternative absorber materials in thin film solar cells. Here, we fabricated high-quality CCTS and CNTS nanocrystal thin films by employing the ion substitution strategy. We systematically studied the crystal structures, surface morphologies and compositions of the as-prepared and selenized thin films via X-ray diffractometry (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The selenized CCTS and CNTS films showed an obvious phase separation process for the oxidizing reaction of Co2+ and Ni2+ with high-temperature selenium steam, and then formed Cu2Sn(S,Se)3, Co(S,Se)2 and Ni(S,Se)2 compounds. We successfully fabricated photodetector devices using CCTS and CNTS nanocrystal films, and achieved a strong and reversible photoresponse performance.
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DOI
高影响因子
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