JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Ting He,Shuang Yao,Dejian Chen,Zhaoyun Sun,Xiaoyun Wang,Keyi Wang,Jiangwei Chen,Qingguo Li,Rizhi Chen,Yawei Wang,Zhaoliang Cui
Membrane oxygenator performs lung function in the Extra-corporeal Membrane Oxygenation (ECMO) system. In the clinical use, to ensure the balance of gas exchange of patient’s body, the gas-blood exchange membrane is required to possess CO 2 /O 2 selectivity, which is suggested to be in the range of 10-12. In our work, the molecular dynamics simulation results displayed that the amino-functionalized Zr-MOFs provides fast transport channels for CO 2 molecules because of the enhancement of the adsorption and diffusion ability for CO 2 . Therefore, we chose organic ligands with abundant CO 2 -philic groups to synthesize target amino-functionalized Zr-MOFs, and then dispersed them into medical-grade PDMS solution to study the separation performance of CO 2 /O 2 . On the basis of constructing anti-leakage coating layer, biomimetic gas channels were designed to increase the clearance rate of CO 2 . Experimental results exhibited that the CO 2 /O 2 selectivity of (NH 2 ) 2 -UiO-66/PDMS MMM was as high as 11.19, which was basically consistent with the simulation results. The obtained amino-functionalized Zr-MOF/PDMS coating layer displayed favorable biocompatibility and biosafety. Meanwhile, the construction of biomimetic channel solves the difficult problem of CO 2 removal in PMP membrane, which verifies the feasibility of applying porous materials to gas-blood exchange membranes in the ECMO system.
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Journal of Energy Chemistry
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2024
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IF 14
Haocheng Xiong,Donghuan Wu,Haonan Li,Andrew Li,Qikun Hu,Siyao Song,Bingjun Xu,Qi Lu
Renewable energy-driven bicarbonate conversion to valuable chemicals presents an attractive strategy for mitigating CO 2 emissions, as bicarbonate can be efficiently generated from the capture of atmospheric CO 2 using alkaline solutions with reactive absorption. In this work, we present a CO 2 -mediated bicarbonate conversion to pure formate using a cation exchange membrane-based electrolyzer with a 25 cm 2 electrode area. Our electrolysis achieved selectivities exceeding 75% for formate at a total current of 2.5 A, achieving formate concentrations up to 1.2 M and yields as high as 95% over extended periods. The techno-economic assessment confirmed the economic viability of the process, highlighting the potential for bicarbonate electrolysis as a sustainable method for producing valuable chemicals.
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JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Xiaoyan Pei,Wangyue Song,Yunlei Shi,Yang Zhao,Zhiyong Li
Pickering emulsions with a stimulus response have been paid extensive concern due to their long-term stability and demulsification on-command. Metal-organic frameworks (MOFs) are expectable emulsifying agents to build Pickering emulsions based on their excellent properties such as high specific surface area, adjustable porosity and pore size. Herein, a novel kind of CO 2 -triggered Pickering emulsions formed by (3-aminopropyl)triethoxysilane (APTES)-functionalized M-MOF-74 (M-MOF-74-APTES, M = Zn, Cu or Mg) has been developed for the first time. It was found that even at the M-MOF-74-APTES amount of 0.5 wt%, the functionalized MOFs could still stabilize the n-hexane-water mixture to construct Pickering emulsions. The as-generated Pickering emulsions could be efficiently demulsified upon bubbling of CO 2 , resulting in complete separation of oil and water phases, but could be restored by subsequent N 2 bubbling under homogenization. Mechanism study indicated that the acid-base reaction of CO 2 with the amino group of M-MOF-74-APTES resulted in the creation of hydrophilic salts, which led to the lowering of particle wettability and broke the stability of the emulsion, causing demulsification of the Pickering emulsion. After removing CO 2 , the emulsion can be reconstructed by the reversible reaction. As an applied example, the Pickering emulsion has been availed as a micro-reaction system and M-MOF-74-APTES as a carrier of Pd(OAc) 2 catalyst to realize the efficient combination of Suzuki-Miyaura reaction, product isolation and reuse of catalysts via alternate bubbling or removing of CO 2 .
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Liu Qinglu,Tang Tang,Tian Ziyu,Ding Shiwen,Wang Linqin,Chen Dexin,Wang Zhiwei,Zheng Wentao,Lee Husileng,Lu Xingyu,Miao Xiaohe,Liu Lin,Sun Licheng
Ion-solvating membranes have been gaining increasing attention as core components of electrochemical energy conversion and storage devices. However, the development of ion-solvating membranes with low ion resistance and high ion selectivity still poses challenges. In order to propose an effective strategy for high-performance ion-solvating membranes, this study conducted a comprehensive investigation on watermelon skin membranes through a combination of experimental research and molecular dynamics simulation. The micropores and continuous hydrogen-bonding networks constructed by the synergistic effect of cellulose fiber and pectin enable the hypodermis of watermelon skin membranes to have a high ion conductivity of 282.3 mS cm −1 (room temperature, saturated with 1 M KOH). The negatively charged groups and hydroxyl groups on the microporous channels increase the formate penetration resistance of watermelon skin membranes in contrast to commercially available membranes, and this is crucial for CO 2 electroreduction. Therefore, the confinement of proton donors and negatively charged groups within three-dimensional microporous polymers gives inspiration for the design of high-performance ion-solvating membranes.
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PubMed
高影响因子
POLYMER
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2015
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IF 3.562
Wei Luo,Shoucun Zhang,Peng Li,Ran Xu,Yuexuan Zhang,Liyun Liang,Colin D. Wood,Qunwei Lu,Bien Tan
For tissue engineering, pore structure is an essential element in the development of scaffolds. In this paper, we obtained highly porous cross-linked partially hydrolyzed poly (vinyl alcohol) (PVA) hydrogels by templating concentrated CO 2 -in-water (C/W) emulsions, which avoid the use of traditional organic solvents and additional surfactants . This method is very convenient for the formation of biocompatible PVA hydrogels, because redundant crosslinking agent and catalyst could be easily removed by washing with the absence of organic solvent and surfactants, and would have widespread applications due to the biocompatibility of the resulting materials. These PVA hydrogels were further evaluated for cellular growth and proliferation to demonstrate their applications in tissue engineering.
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RSC Advances
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2016
·Vol. 6
·期 48
·42693-42700
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IF 3.289
Rui Zhang,Zhenchuan Yu,Yu Cang,Xiaoyan Hou,Zheqi Shen,Jie Deng,Zhiming Zhou,Xuhong Guo,Junwei Wang,Xuedong Zhu
Spherical polyelectrolyte brushes (SPBs), consisting of a poly(styrene) core and poly(acrylic acid) shell densely grafted from the core surface, were synthesized by photoemulsion polymerization. A novel method for highly selective separation of methylene blue (MB) and other dyes is proposed herein, which employs spherical polyelectrolyte brushes as the adsorbent and compressed CO2 as the antisolvent; neither polymer brush nor CO2 on their own can separate the dyes. The SPBs and adsorbed dyes can be precipitated simultaneously from organic solutions by the easy control of CO2 pressure. The effects of several parameters such as CO2 pressure, initial dye concentration and temperature on the removal of MB by PS-PAA have been determined. MB can be selectively adsorbed by PS-PAA from the mixed dye solution with high efficiency, indicating that the binding of MB onto PS-PAA is probably dominated by electrostatic interactions. Due to the Donnan effect of the polymer brush, the adsorbed dyes can be easily eluted by NaCl aqueous solution through ion exchange to obtain the regeneration of the polymer brush, and the recovered PS-PAA retains high adsorption capacity even being regenerated five times. This provides a simple and effective way for the separation of ionic materials, which could be applied in environmental engineering.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2017
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IF 3.615
Zhihong Tian,Jiajia Huang,Xin Zhang,Gonglei Shao,Qiuyun He,Shaokui Cao,Siguo Yuan
High adsorption capacity and selectivity of microprous carbon are critical for exceptional post-combustion CO 2 capture ability. Herein we report a novel strategy to prepare N-doped microprous carbon with high surface area (2363 m 2 g −1 for CPTHB-7), narrow pore size distribution and high ultramicropore ratio (<0.7 nm, 68% for CPTHB-6) via a simple chemical activation of a rigid polymer porous framework (PTHB) synthesized via polycondensation reaction of 1,3,5-THB and aniline. The as-prepared microprous carbon exhibit high CO 2 adsorption capacities of 5.6–6.3 mmol g −1 (273 K and 1 bar) and sufficient CO 2 /N 2 selectivity of 12–22 for a 0.15/0.85 CO 2 /N 2 mixture at 298 K and 1 bar (conditions of CO 2 capture application). The effect of microporosity and N content for our materials on the CO 2 adsorption performance had also been investigated. Microporous volume below critical size contributed to the adsorption capacity for CO 2 , while the N content and nitrogen species play a role in the CO 2 /N 2 selectivity.
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ACS Applied Materials & Interfaces
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2016
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IF 7.145
Mengya Niu,Huaming Yang,Xiangchao Zhang,Yutang Wang,Aidong Tang
Pristine halloysite nanotubes (HNTs) were pretreated to produce mesoporous silica nanotubes (MSiNTs), which was further impregnated with polyethenimine (PEI) to prepare an emerging nanocomposite MSiNTs/PEI (MP) for CO2 capture. Thermogravimetric analysis (TGA) was employed to analyze the influences of PEI loading amount and adsorption temperature on CO2 adsorption capacity of the nanocomposite. The Brunauer–Emmett–Teller (BET) surface area (SBET) of MSiNTs was six times higher than that of HNTs, and the corresponding pore volume was more than two times higher than that of HNTs. The well dispersion of PEI within the nanotubes of MSiNTs benefits more CO2 gas adsorption, and the adsorption capacity of the nanocomposite could reach 2.75 mmol/g at 85 °C for 2 h. The CO2 adsorption on the nanocomposite was demonstrated to occur via a two-stage process: initially, a sharp linear weight increase at the beginning, and then a relatively slow adsorption step. The adsorption capacity could reach as high as 70% within 2 min. Also, the nanocomposite exhibited good stability on CO2 adsorption/desorption performance, indicating that the as-prepared emerging nanocomposite show an interesting application potential in the field of CO2 capture.
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PubMed
高影响因子
RSC Advances
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2016
·Vol. 6
·期 69
·65282-65290
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IF 3.289
Dongdong Peng,Ye Liu,Shaofei Wang,Zhizhang Tian,Qingping Xin,Hong Wu,Jianfeng Chen,Zhongyi Jiang
Facilitated transport membranes by utilizing π complexation reactions between metal ions and penetrants have been actively explored, however, the different facilitated transport abilities of metal ions remains to be disclosed. In this study, poly(N-vinylimidazole) coated carbon nanotube particles (PVI@CNT) were prepared via precipitation polymerization of N-vinylimidazole monomers on a CNT surface. The PVI@CNT particles were then loaded with four kinds of divalent metal ions, Cu2+, Fe2+, Ca2+ and Mg2+, and incorporated into polyimide (PI) to prepare M2+–PVI@CNT hybrid membranes. The structure of M2+–PVI@CNT particles and PI–M2+–PVI@CNT membranes was analyzed by different characterization tools. Taking CO2/CH4 as the model separation system, the hybrid membranes containing Cu2+ and Fe2+ at filler content of 7 wt% showed the maximum increase of CO2 permeability of 89% and 87% compared with those of a pristine PI membrane. Meanwhile, the selectivity of these membranes shows little increase. However, membranes containing Ca2+ and Mg2+ show only little enhancement in the separation properties. Such results can be interpreted based on the π complexation mechanism, transition metal ions Cu2+ and Fe2+ possess a strong CO2 facilitated transport ability whereas main-group metal ions Ca2+ and Mg2+ possess a weak facilitated transport ability. Finally, a correlation of the electronegativity of metal ions with their CO2 facilitated transport abilities was explored.
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ENERGY
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2016
·
IF 4.292
Xiao Cheng,Rong Chen,Xun Zhu,Qiang Liao,Liang An,Dingding Ye,Xuefeng He,Shuzhe Li,Lin Li
The development of highly efficient photocatalytic reactor is of importance to improve the performance of the photocatalytic reduction of CO 2 . In this work, an optofluidic planar microreactor is designed and fabricated for the photocatalytic reduction of CO 2 with liquid water in alkaline environment . Such design offers several advantages of large surface-area-to-volume ratio, enhanced mass and photon transfer and more uniform light distribution. The performance of the developed planar microreactor is evaluated by measuring the methanol concentration to estimate the methanol yield under various operating parameters, including the liquid flow rate , light intensity, catalyst loading and NaOH concentration. It is shown that increasing the liquid flow rate firstly improves and then decreases the methanol concentration while the methanol yield continuously increases as the liquid flow rate increases. The increase of the light intensity and NaOH concentration increases both the methanol concentration and yield. Increasing the catalyst loading firstly improves the performance and then results in the reduction of the performance. A maximum methanol yield of 454.6 μmole/g-cat·h is achieved under a liquid flow rate of 50 μL/min, 0.2 M NaOH, and the light intensity of 8 mW/cm 2 .
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APPLIED SURFACE SCIENCE
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2016
·
IF 3.15
Xiancheng Ma,Liqing Li,Shaobin Wang,Mingming Lu,Hailong Li,Weiwu Ma,Tim C. Keener
A porous carbon (ZC) was prepared at 900 °C using zeolitic imidazolate framework-8 (ZIF-8) as a solid template for CO 2 adsorption. The ZC was further treated by ammonia functionalization to improve CO 2 uptake. The textural and surface characteristics of ZC samples were determined by X-ray diffraction (XRD), N 2 adsorption, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). It was revealed that ammonia treatment at 600 °C considerably enhanced the specific surface area and N-content of ZC. However, the pyrrolic-N group was decreased, yet the pyridinic-N group was increased with an increased temperature. The pyrrolic-N significantly enhanced CO 2 adsorption. The ammonia treatment, on the one hand, increases the alkalinity of ZC sample and the base–acid interaction between N-containing functional groups with CO 2 . On the other hand, the ammonia treatment increased pyrrolic-N group (NH) into carbon surface facilitating the hydrogen-bonding interactions between proton of pyrrolic-N and CO 2 molecules.
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
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IF 4.758
Wei Lu,Peng Xiao,Jincui Gu,Jiawei Zhang,Youju Huang,Qing Huang,Tao Chen
A polymer-based visible and quantitative fluorometric assay for CO 2 gas is constructed using branched polyethyleneimine (PEI) covalently modified with tetraphenylethylene (TPE). The sensing mechanism relies on the reaction of CO 2 with alkylamines of PEI to induce the “solution-to-precipitation” phase transition of the sensory polymer (TPE–PEI), thus resulting in strong aggregation-induced fluorescent emission of TPE–PEI. It works in a relatively environmental benign ethanol medium and avoids the use of toxic amine compounds with unpleasant odor. More importantly, this system is proved to be highly tolerant to possibly coexisting water, carbon monoxide , acid SO 2 and H 2 S gases as well as many common volatile organic compounds. These characteristics make the presently developed fluorescent chemosensor hold great potential for many real-world applications.
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