ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Gen Li,Zhonggang Wang
This paper presents a series of micro- and ultramicroporous polyaminals with BET surface areas up to 1304 m2 g–1, which are prepared from two triazine-based tetraamines and three dialdehydes or monoaldehyde through the A4 + B2 or A4 + B1 aminalization reaction. It is interesting to find that the para-substituted monomers are favorable to force the linking struts apart in the network to generate micropores (1.22 nm), whereas the meta-substituted monomers make the pores in the network squeezed by the twisted linking struts, resulting in the formation of ultramicropores (0.52 nm). Besides, the adsorption behaviors of the major components of natural gas, such as propane (C3H8), ethane (C2H6), methane (CH4), and carbon dioxide (CO2), are significantly different, strongly depending on the polarizabilities, critical temperatures, molecular sizes of gases, porosity parameters of polymers, and the interaction between gases and the polymer skeleton. At 298 K/1 bar, the polymers show high uptake for C3H8 (114.5 cm3 g–1) and C2H6 (84.2 cm3 g–1). Moreover, the adsorption selectivities of C3H8/CH4, C2H6/CH4, C3H8/C2H6, C3H8/CO2, C2H6/CO2, and CO2/CH4 also reach 296.3, 23.1, 9.0, 22.1, 4.1, and 5.0, respectively, exhibiting promising applications in adsorption/separation of C1–C3 hydrocarbons and stripping CO2 gas from natural gas under the ambient condition.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2016
·
IF 4.509
Kunpeng Song,Zhijuan Zou,Deli Wang,Bien Tan,Jingyu Wang,Jian Chen,Tao Li
The usage of noble metal catalysts for oxygen reduction reaction (ORR) can be minimized by supporting them on porous carbon. Herein, a simple and industrially scalable approach for preparation of porous carbon supports is developed by directly pyrolyzing microporous organic polymers (MOPs). The rigid aromatic building blocks in MOPs function as self-templates to retain the high surface area and regular pore distribution during carbonization to the formation of high quality microporous carbon framework. The electrochemical performance of Pd catalysts supporting on MOPs-derived carbons is evaluated and compared with commercial products, indicating the superiority of MOPs as carbon precursor. Significant difference in ORR activity is observed among three types of MOPs due to the impact of framework and heteroatom. The highest performance of Pd/CKN catalyst is attributed to heteroatom-induced altering of electronic structures besides the stable skeleton.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
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.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Lili Gong,Zhili Cai,Can Wang,Ju Bai,Linglong Shan,Xianghai Meng,King Lun Yeung,Haitao Zhang,Zhichang Liu,Shuangjiang Luo
Superacid-catalyzed polymers of intrinsic microporosity have attracted increasing attention in membrane-mediated gas separation due to their good processability, facile polymerization procedure, and tunable microporosity and gas separation performance. In this study, we synthesized a series of new superacid-catalyzed polymers with fully ladder backbones and well-defined micropores using a one-pot condensation polymerization. The incorporation of a contorted spirobisindane building block facilitated the formation of highly microporous structures in the resulting polymers, enhancing their intrinsic microporosity and gas separation properties. Among the three SACPs, SACP-PhMe exhibited the largest d-spacing value, specific surface area, and pore volume due to its bulkiest side group. The gas separation performance of the SACP membranes surpassed several benchmark polymer membranes, with the SACP-PhMe membrane demonstrating excellent performance in separating CO2/CH4, H2/CH4, O2/N2, and H2/N2. The SACP-Me membrane exhibited the lowest porosity, making it less susceptible to CO2 absorption and showing superior plasticization resistance. The results highlight the promising gas separation properties of the SACPs and their potential for various gas separation applications, offering new opportunities for advanced polymer membrane design.
研究领域:
材料科学
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化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Ding Jialian,Zhou Ping,Guo Weiliang,Su Bin
Electrochemiluminescence (ECL) imaging analysis based on the ultra-high-density microwell electrode array (UMEA) has been successfully used in biosensing and diagnostics, while the studies of ECL generation mechanisms with spatial resolution remain scarce. Herein we fabricate a gold-coated polydimethylsiloxane (PDMS) UMEA using electroless deposition method for the visualization of ECL reaction process at the single microwell level in conjunction with using microscopic ECL imaging technique, demonstrating that the microwell gold walls are indeed capable of enhancing the ECL generation. For the classical ECL system involving tris(2,2′-bipyridyl)ruthenium (Ru(bpy)32+) and tri-n-propylamine (TPrA), the ECL image of a single microwell appears as a surface-confined ring, indicating the ECL intensity generated inside the well is much stronger than that on the top surface of UMEA. Moreover, at a low concentration of Ru(bpy)32+, the ECL image remains to be ring-shaped with the increase of exposure time, because of the limited lifetime of TPrA radical cations TPrA+•. In combination with the theoretical simulation, the ring-shaped ECL image is resolved to originate from the superposition effect of the mass diffusion fields at both microwell wall and bottom surfaces.
研究领域:
分析化学
·
生物传感
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医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Weiwei Shi,Quanqi Zhang,Shiji Liu,Suisui Su,Binbin Chang,Baocheng Yang
The superior ultramicroporosity and enriched surface CO 2 -philic sites are simultaneously required features for high-efficiency carbon-based CO 2 adsorbents. Unfortunately, these characteristics are usually incompatible and difficult to integrate into one porous carbon material. Herein, we report a new copper ions (Cu 2+ )-assisted dynamic porogen to construct hierarchically microporous carbon nanosheets in a large scale with high heterogeneity for solving such issue. Cu 2+ can be equably dispersed in precursor by coordination interactions of COO-Cu and Cu-N, which can anchor more N/O-containing species in final product. The reduced cuprous ions (Cu + ) in pyrolysis process functions as a dynamic porogen to tailor uniform ultramicropores. Importantly, copper salt extracted in this synthetic procedure allows cyclic utilization, realizing a green and low-cost process. The obtained carbon sheets possess a graphene-like morphology, a high surface area and a high-proportioned multiscale microporosity , especially a high-density ultramicropores of 0.4–0.7 nm and supermicroproes of 0.8–1.5 nm. The maximized synergistic effect of morphology, high density of multi-sized ultramicroporosity and surface high heterogeneity endow the resultant microporous carbon nanosheets with the remarkable CO 2 capture property, including a high uptake, a moderate adsorption heat, a good selectivity and superior recyclability.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Ishioma Laurene Egun,Qi Han,Tamar L. Greaves,Xiuhua Zhang,Yang Hou,Zhengfei Chen
Biomass-derived carbon has shown significant potential as an active electrode material for supercapacitors, primarily due to its intrinsic porous architecture and the presence of heteroatom dopants. However, achieving hierarchical porous carbon through a simple, single-stage thermal process with minimal resources is a significant challenge. In this study, we propose molten base carbonization and activation (MBCA) with wet biomass feedstock as a viable strategy for converting abundant waste coffee grounds into high-performance porous carbon. This method utilizes wet biomass and KOH to enable the intercalation of potassium ions into the biomass components matrix. Through nucleophilic interactions at various reactive oxygen sites, carbon and hydrogen bonds are disrupted, with K + intercalation resulting in organic potassium compounds prior to drying. These potassium compounds facilitate carbonization and in-situ activation in a single-stage thermal process. The optimized carbon sample (2-WCW) had a specific surface area of 1187 m 2 g −1 , abundant ultramicropores, oxygen and nitrogen functionalities. It also displayed high specific capacitance of 351 F g −1 at 5 mV s −1 and 120 F g −1 at 10 A g −1 in 6 M KOH with cycling stability of over 50,000 cycles and 96 % capacitance retention. The assembled device using an organic electrolyte displayed a specific energy and power of 5.6 Wh kg −1 and 5000 W kg −1 respectively, and further exhibited good self-discharge after 100 h. This study offers insights into the importance of the state of the biomass before thermal treatment for tuning its porous structure and surface functionalities for enhanced electrochemical performance in supercapacitors.
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产品关联
DOI
高影响因子
AICHE JOURNAL
·
2020
·Vol. 66
·期 10
·e16543
·
IF 3.519
Shanshan He,Xu Jiang,Songwei Li,Feitian Ran,Jun Long,Lu Shao
The high fractional free volume (FFV) endowed polymers of intrinsic microporosity (PIMs) with high gas permeability but low selectivity. Herein, an intermediate temperature range was deliberately utilized to tune PIM-1 membrane microstructure in nitrogen atmosphere to enhance gas separation performance. During intermediate thermal manipulation, the synergistic effects of thermal-induced cross-linking and decomposition on PIM-1 membranes have optimized the micropores for significantly increasing membrane molecular-sieving ability with the boosted selectivity of 350 (H 2 /N 2 ), 1,472 (H 2 /CH 4 ), 3,774 (H 2 /C 3 H 8 ), and 197 (CO 2 /CH 4 ) respectively, with the H 2 permeability of 234 Barrer, correspondingly, surpassing the “Robeson's Upper Bound”. The facile strategy simultaneously utilizing the thermal-induced cross-linking and decomposition, might provide a new platform to develop the high-performance membranes for highly-efficient hydrogen purification and CO 2 separations.
研究领域:
材料科学
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高分子科学
·
化学工程
·
膜技术
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气体分离
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yehao Jin,Aiwen Zhang,Guanying Dong,Jingwei Hou,Junyong Zhu,Yatao Zhang
Microporous organic polymers (MOPs) featuring chemically rigid backbones and permanent micropores are desirable for fabricating molecular selective membranes towards organics separation. However, coordinating facile film processing with high micropore persistence remains a challenge. In this paper, a low molecular weight polymers of intrinsic microporosity was rationally designed by precisely controlling the stoichiometric equilibrium of polymerization monomer. The polymers of intrinsic microporosity oligomers combine rigid and contorted structures with the aqueous solution processability, promoting the formation of 25-nm-thick polyaramide nanofilms with enhanced microporosity via support-free interfacial polymerization (SFIP). The resulting composite membranes have superior retention of small molecular solutes and high nonpolar and polar solvent permeances. Experiment and simulation results show that their excellent separation performance is due to substantially open and interconnected microporosity formed in the polymer networks based on rigid and contorted diamines as well as reduced film thickness. This study provides a new sight for using MOPs to construct high-microporosity membranes for precise and rapid molecular sieving.
研究领域:
材料科学
·
分离技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2023
·
IF 5.2
Duanlian Tang,Xiaoying Lyu,Zhixian Huang,Renwei Xu,Jie Chen,Ting Qiu
Nitrogen-doped microporous carbon, which features a uniquely tunable porosity, exhibits promisingly high adsorption prospects in the greenhouse gas capture and water treatment. Herein, we propose a series of novel N-doped microporous carbons (CMPA n -C1000), and precisely tune their porosities via a direct pyrolysis of rigid conjugated microporous poly(aniline)s (CMPA n , n = 1, 2, 3) with pore size difference in a molecular level, as achieved by simply tuning their linkers with varying sizes, planarity, and symmetry. The CMPA3-C1000, with a satisfactory amount of nitrogen heteroatoms , high S BET of ∼800 m 2 g −1 , and large ultra-micropore volume of 0.25 cm 3 g −1 , has excellent CO 2 capture ability ( i.e. , 5.1 mmol g −1 at 273 K, 1 atm) and Hg(II) adsorption performance ( i.e. , Q e = 571 mg g −1 ; k 2 = 0.0031 g mg −1 min −1 ), respectively. CMPA3-C1000 might perform chemisorption towards Hg(II), according to calculations using density functional theory and experimental data; nitrogen atoms in porous carbon contributed to this excellent Hg(II) adsorption.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2013
·Vol. 5
·期 10
·3114-3123
·
IF 5.181
Jinze Lyu,Lizhong Zhu,Clemens Burda
Graphical Fight pollution! A comparison of the adsorption and photodegradation of gas phase toluene under realistic indoor air purification conditions with the nature of microporous amorphous TiO 2 and mesoporous anatase catalysts Adsorption and photodegradation are key steps in environmental air purification. Micropores have been introduced into anatase TiO 2 nanocatalysts to enhance the adsorption of pollutant molecules onto the photocatalyst surface, which increases the use of the photoinduced electron–hole pairs. Three nanocomposites have been synthesized with dodecylamine as a pore-forming agent under mild hydrothermal conditions and at varying temperature of preparation. Samples synthesized at 100, 115, and 130 °C, labeled TiO 2 -100, TiO 2 -115, and TiO 2 -130, respectively, provided insights into the effect of crystallinity and micropore area on the removal efficiency of gas-phase organic pollutants. Of the three, TiO 2 -100 had the largest micropore area (493 m 2 g −1 ) but amorphous phase. TiO 2 -130 had anatase phase but only mesopores, whereas TiO 2 -115 had both a relatively large micropore area (258 m 2 g −1 ) and an anatase crystal structure. Toluene was chosen as a model air pollutant. Experiments were performed in a single-pass reactor in the presence of UV irradiation under various experimental conditions, such as varying partial pressures of toluene, contact times, and relative humidities of the mobile gas phase, to approximate realistic conditions for this air purification system. Of the three prototype catalysts, TiO 2 -115 showed the highest removal and mineralization efficiencies owing to the optimized availability of photogenerated holes and adsorbed toluene. The key parameters for optimized photocatalysis of low-concentration air pollutants are the micropore area and the crystallinity of the photocatalyst.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Kai Mi,Congcong Yin,Sen Xiong,Yanqiu Lu,Yong Wang
Conjugated microporous polymers (CMPs), characterized by permanent microporosity and exceptional stability, represent a promising class of materials for next-generation molecular-sieving membranes. Nevertheless, high-quality CMP membranes with well-designed pore architectures remain inaccessible due to the challenges associated with processing these materials. Herein, we report a molecular layer deposition (MLD) process for the sequential assembly of 3-butylthiophene and 3,3′-bithiophene in situ on commercial nanofiltration substrates under MoCl 5 oxidation. The precise MLD strategy enables the integration of flexible alkyl chains to soften the CMP backbone while preserving its intrinsic microporosity. The resulting composite CMP membranes enabled high-resolution purification of nanoscale species with molecular weights as low as 270 g mol −1 while exhibiting exceptional long-term stability during continuous operation over 150 h. We also proved that thus-prepared CMP membranes exhibit great potential for the purification and recovery of high-value pharmaceuticals and catalysts. This work highlights the potential of MLD as a versatile strategy for fabricating CMP membranes and grafting internal functionalities, enabling high-resolution separation in liquid systems.
研究领域:
材料科学
·
膜技术
·
高分子化学
·
分离科学
·
有机溶剂纳滤
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）