JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yonghong Wang,Kaixin Wang,Xinru Zhang,Jinping Li
Carbon molecular sieve (CMS) membranes are widely used for the separation of similar molecular kinetic diameter gas. However, their performance is limited by a large amount of discontinuous porous structures and a few adsorption affinity sites. Herein, we first prepared magnetic Co@NC@ZIF-8 nanoparticles , followed by introducing it into the polyimides matrix to design precursor membrane with vertical nanochain-like particle distribution by magnetic field induction. Afterwards, hybrid carbon molecular sieve (HCMS) membranes were prepared by pyrolyzing precursor with high-temperature under N 2 atmosphere, which had ordered microporous architecture and Co-N-C structure. Resultant HCMS membranes prepared by magnetic field induction had excellent gas separation performance, whose CO 2 , N 2 and CH 4 permeabilities were 27,050, 2614 and 622 Barrer, with CO 2 /N 2 , CO 2 /CH 4 and N 2 /CH 4 selectivities of 10.4, 43.5 and 4.2 respectively. These values far exceeded 2019 CO 2 /CH 4 and 2008 N 2 /CH 4 upper bounds as well as approached 2008 CO 2 /N 2 upper bound. The superior performance resulted from the vertically ordered nanochain-like channels for gas transport, which dramatically shortens the transport path of gas molecules to intensify shape sieving potential. Moreover, the Co-N-C structure on the wall of channels could facilitate CO 2 transport due to the π complexation. Additionally, a large quantity of nitrogen sites in the carbonized Co@NC@ZIF-8 enhance CO 2 adsorption selectivity owing to the acid-base interaction. More remarkably, after 30-day aging testing, it was found that HCMS membranes prepared by magnetic field induction had exceptional aging resistance compared to the pristine CMS membranes and one without magnetic field induction under the same aging environments.
研究领域:
材料科学
·
化学工程
·
膜技术
·
气体分离
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Mingwei Cai,Heng Liu,Jiongcai Chen,Luxin Sun,Jiahao Wu,Zhiyin Chen,Zhenjing Han,Tingting Cui,Shiyang Zhang,Yonggang Min,Xiaohua Ma
A crucial problem in membrane-based gas separation is to fabricate membranes with excellent permeability, selectivity, and stability. Here, a high-performance carbon molecular sieves membrane of TR-CMS/SSZ-13 was successfully produced by pyrolyzing a thermally rearranged (TR) mixed matrix membrane (MMM) that obtained from a copolyimide precursor (6FDA/ODA/6FAP(3:2)) and SSZ-13 zeolite as filler at 450 °C. The effect of SSZ-13 zeolite content and structures of precursors on the transport behavior of derived CMS membranes was thoroughly studied. After TR process, the as formed polybenzoxazole (PBO) chain resulted in an enhanced rigidity, higher fractional free volume (0.15 vs 0.17), and a significantly increased (1898 times) BET surface area. Further enhancing the treatment temperature to 650 °C, the formed TR-CMS membranes exhibited a huge improved BET surface area from 228.2 to 639.3 m 2 /g, delivering a remarkable gas separation performance with H 2 permeability of 7089 Barrer and H 2 /CH 4 selectivity of 136. When doping with SSZ-13 till 15 wt%, the TR-CMS/SSZ-13–15 % showed an even higher H 2 (9726 Barrer) and CO 2 permeability (6932 Barrer), as well as H 2 /CH 4 (150 vs 136) and CO 2 /CH 4 (107 vs 57) selectivity than the pure TR-CMS, which surpassed the newest 2019 Robeson Upper bound. This can associate with the strong interaction between the modified SSZ-13 and the polymer matrix that prevent the collapse of the aromatic strand during the pyrolysis process, thereby create more ultra-micropore volume and concentration. Conclusively, pyrolyzing TR-MMM precursor is an effective way to form high-performance membranes with good potential for CO 2 separation and H 2 purification.
研究领域:
材料科学
·
化学工程
·
膜技术
·
气体分离
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Changhai Fan,Zhengwang Xia,Haiqian Lian,Luogang Wu,Eryue Song,Jingxian Hua,Li Shen,Rujing Hou,Yichang Pan,Weihong Xing
The ZIF-8 membrane has emerged as a promising candidate for C 3 H 6 /C 3 H 8 separation. However, the feasibility of ZIF-8 membranes for applications has rarely been investigated with gas provided directly by the industry sector. Herein, the C 3 H 6 /C 3 H 8 mixture collected from the backend of the Hydrogen Peroxide to Propylene Oxide (HPPO) process was applied as feed gas to examine the separation performance of tubular ZIF-8 membranes. The membranes exhibited excellent separation performance and long-term stability under 9 bar and 50 °C. Noticeably, upon scaling up to a membrane area of 452.16 cm 2 by connecting six three-channel modules in series (multi-step membrane), its separation performance satisfied the C 3 H 6 circulation requirements during the HPPO process (purity ≥97.5 % and recovery rate ≥85 %). Furthermore, a simulation of membrane operation under industrial working conditions (22 bar and 56.3 °C) was performed. By fixing the separation factor at 15, a minimum membrane area of 800 m 2 met the requirements at the cost of membrane permeance with 120 GPU. The corresponding economic calculation indicated a maximum of 91.8 % annual capital cost saving compared with the distillation process, paving the way for the practical application of membranes.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Rui Li,Dong Zou,Jinxin Liu,Zhaoxiang Zhong,Weihong Xing
High-temperature gas-solid separation applications demand ceramic membranes with both exceptional mechanical integrity and superior gas permeance, yet conventional processing methods struggle to achieve this balance due to inherent trade-offs between porosity and strength. To address this challenge, a novel emulsion-templating approach was developed for fabricating lightweight porous silicon carbide ceramic membranes (PSCM) with controlled pore architecture and enhanced transport properties. The fabrication strategy employed oil-in-water emulsions stabilized by Tween 80 surfactant, where systematic optimization of surfactant concentration, solid content, and oil-to-water ratios enabled precise control over droplet size and final pore structure. Comprehensive characterization revealed that optimal processing conditions (55 wt% solid content, 1200 °C sintering) produced membranes with 78.5 % porosity and robust flexural strength, and exceptional gas permeance of 188.6 m 3 ·m −2 ·h −1 ·kPa −1 . Performance benchmarking demonstrated superior Darcy’ permeability coefficients compared to conventional porous ceramics at similar porosity levels. High-temperature dust filtration testing at 300 °C using 0.3 μm alumina particles achieved 99.99 % removal efficiency with moderate pressure drop, while long-term stability evaluation confirmed excellent regeneration capability through pulse cleaning cycles. The emulsion-templating methodology successfully overcomes traditional processing limitations, enabling simultaneous optimization of mechanical integrity and transport efficiency for demanding industrial gas cleaning applications.
研究领域:
材料科学
·
陶瓷工程
·
环境工程
·
分离技术
·
高温处理
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiaming Wang,Feifei Kang,Yifei Chen,Xiujuan Zhang,Xiaobin Jiang,Gaohong He,Xuehua Ruan
Artificial lung membranes are the heart for extracorporeal oxygenation. Hereinto, the nonporous PDMS-based membranes have excellent biocompatibility, and also isolation ability to both blood and harmful matters. Nevertheless, their CO 2 /O 2 selectivity, in the conventional cases using pure-oxygen sweeping stream, is not enough to accomplish sufficient CO 2 removal in balance with O 2 addition. In this work, the oxygenation mode using oxygen-enriched stream, faithfully based on the permeation mechanism, is established to overcome this bottleneck. To neutralize the negative impacts caused by lowering oxygen content and its partial pressure, PDMS-based composite membranes with ultra-thin selective layer to enhance mass transfer have been fabricated successfully. The experiments manifest that the selective layer, on the basic condition that the composite structure is stable enough to make surface modification and realistic utilization, is decreased to 376 nm on the porous substrates. O 2 and CO 2 permeation rates through the ultimate membrane samples have been enhanced to 502 GPU and 4117 GPU, respectively. In this instance, the essential oxygenation could be sustained with O 2 partial pressure less than 446 mmHg in the sweeping stream. The minimum membrane area for a common treatment case is 0.05 square meters. Once the membrane area is increased to 0.18 square meters, the sterile air after purification could be directly used for oxygenation. In comparison to the oxygenation devices being used currently, membrane area can be saved by about 90 %, which is highly significant to reduce the injuring influence on blood cells. All in all, the artificial lung membranes with ultra-thin PDMS coating layer have promising future in realistic utilization.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Qing Guo,Ze Li,Xuanxiang Zeng,Dan Li,Huiming An,Li Zhao,Liang Tao,Qiang Li
Reduction of the reservoir permeability during supercritical CO2 fracturing caused significant reservoir damage, which directly affects the crude oil recovery rate. This investigation explored a novel thickener for supercritical CO2 fracturing fluid, this CO2 thickener not only effectively improves the viscosity and rheological properties of CO2 fracturing fluid but also contributes to reduce reservoir damage and improve permeability. The research results indicated that the synthesized CO2 thickener (3 wt %) can increase the apparent viscosity of supercritical CO2 fracturing fluid to 7 mPa·s, and a 9% matrix permeability damage rate and a 0.5 mD permeability decrease value are shown in a 3% CO2 fracturing fluid. However, 3 wt % of commercial CO2 thickener only increases the apparent viscosity of supercritical CO2 fracturing fluid to 3 mPa·s, while the reservoir damage rate increases to 13%. Two thickeners exhibit completely different damage capabilities to the reservoir, and the synthesized CO2 thickener shows excellent characteristics of reducing reservoir permeability and is also conducive to protecting shale reservoirs. Furthermore, supercritical CO2 fracturing fluid containing synthetic thickeners has better temperature and shear resistance compared with commercial thickeners. This may be because the synthesized thickener and the micro grid formed by supercritical CO2 reduce the adsorption in shale crevices, but a large amount of commercial thickeners can adsorb on the surface of shale.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Jinlong Cui,Kun Li,Liwei Cheng,Qingping Li,Zhenfeng Sun,Peng Xiao,Xingxun Li,Guangjin Chen,Changyu Sun
To improve the exploitation efficiency of future commercial marine natural gas hydrate , it is of critical significance to have a solid understanding of the spatial differences of hydrate dissociation. However, few studies have investigated this topic. In this study, a novel L-shape Hydrate Simulator (LHS) with a vertical vessel and a horizontal vessel was established and used to investigate the spatial differences of hydrate dissociation in water-saturated methane hydrate samples by depressurization. It was amazingly found that the hydrate dissociation was abnormally much faster in the location far from the mining well with the highest pressure than in the location near the mining well with the lowest pressure in the vertical vessel. This abnormal phenomenon was caused by the earliest uneven vacating of pore spaces in the vertical vessel. This phenomenon was not obvious in the horizontal vessel as there was little difference in the pore spaces vacating rates in different locations. The pressure reduction leaded to faster hydrate dissociation near the mining well in the horizontal vessel. The experiments on sediments with different permeability indicated that the sediments with higher permeability showed more pronounced spatial difference of hydrate dissociation, and the presence of clay (montmorillonite) in the sediments had significant impacts on the spatial difference of hydrate dissociation. The results in this study demonstrate that vacating of pore spaces of sediments is of determining significance for increasing hydrate dissociation rate in water-saturated sediments and provide important implications for developing methods to enhance the gas production from marine hydrate deposits.
研究领域:
海洋地质学
·
能源工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Peng Zu,Haoning Li,Guangming Yan,Gang Zhang
In this study, Ti 3 C 2 T x layers with an average lateral size of approximately 8.3 μm were prepared. The LLM composite membranes synthesized from these layers not only possessed long and narrow mass transfer channels but also further prevented the generation of internal non-selective defects. Additionally, a strategy of compositing these Ti 3 C 2 T x layers and Al(OH) 3 was adopted. The strategy contributed to expanding the interlayer distances of the composite membranes and adjusting the in-plane stacking order, thereby facilitating the construction of mass transfer channels characterized by high permeance within the membranes. This resulted in the preparation of LLMA membranes. Among these LLMA membranes, the LLMA-1:7 composite membranes displayed outstanding performance in the sieving process. Their permeances were more than 10 times higher than those of the LLM membranes (with a thickness of 1 μm). Also, the rejection ratio for CV dye could even exceed 99 %, and the operational stability was also significantly improved. These advantages enabled them to avoid some of the shortcomings commonly found in two-dimensional (2D) separation membranes to a certain extent. In summary, the LLMA-1:7 composite membranes designed in this study demonstrated superior overall performance, compared to the majority of the previously reported 2D membranes. This research is expected to establish a solid foundation for the application of 2D MXene membranes in the field of water treatment.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2021
·
IF 7.147
Jin-Long Cui,Li-Wei Cheng,Jing-Yu Kan,Wei-Xin Pang,Jun-Nan Gu,Kun Li,Ling-Ban Wang,Chang-Yu Sun,Xiao-Hui Wang,Guang-Jin Chen,Xing-Xun Li
The spatial difference of hydrate dissociation by depressurization was investigated in an L-shape hydrate simulator to enhance the exploitation efficiency of natural gas hydrates . Hydrates were found to dissociate slower near the mining well than far from the mining well due to the higher water saturation. The mass transfer rate of methane molecules in the water phase was much slower than that in the gas phase. In both vertical and horizontal directions, pore water migrated from the location far from the mining well to that near the mining well in the hydrate reservoir under the pressure difference. This led to a lower dissociation rate for the hydrate distributed at the location near the mining well, which was different from the results in gas/petroleum reservoirs and numerical simulations. The spatial difference was more pronounced in the vertical direction than in the horizontal direction. Gravity caused more water migration in the vertical direction, which led to more uneven dissociation of the hydrates. Sediments with higher permeability and lower mining pressure could result in more pronounced spatial differences. These findings can provide deep insights into the spatial evolution of multiple fields during the exploitation of natural gas hydrates .
研究领域:
地质学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xiuxiu Ren,Fukang Shi,Meng Guo,Jing Zhong,Rong Xu,Zheng Yao,Dongliang Jin,Ting Qi,Liang Zhou
Two-dimensional (2D) molybdenum disulfide (MoS2) with a unique action on H2 was incorporated into 1,2-bis(triethoxysilyl)ethane (BTESE)-derived bridged microporous organosilica networks to form a composite membrane for H2 separation by a sol–gel method. Due to their opposite ζ-potentials, a continuous surface without lamellar boundary defects was formed between BTESE sols derived by the hydrolysis–polymerization reaction and MoS2 nanosheets. When the MoS2 content increased in BTESE networks, the H2 permeance showed an overall increasing trend in the range of 1.85–2.89 × 10–7 mol·m–2 s–1 Pa–1 (552–864 GPU), which was higher than that of pristine BTESE membrane with the H2 permeance of 491 GPU. In addition, optimized MoS2/BTESE membranes showed a much higher H2/N2 permselectivity of 129 than that of the pristine BTESE membrane of 17 at 100 °C. The synergistic effect of BTESE and MoS2 nanosheets plays an important role. Through adsorption isotherm test and diffusivity as well as energy calculation, BTESE networks became denser by nonporous MoS2 addition that prevented N2 from passing, while H2 was promoted with excellent adsorption on charged edges of MoS2, resulting in improved H2 separation performance both in permeance and selectivity. This provides an attractive mechanism for hydrogen separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Bowen Zhou,Juan Luo,Ruitao Li,Rongrong He,Tao He
Oxidation resistant nanofiltration (NF) membranes have been pursued for wide applications. Mostly researched NF membranes were based on interfacial polymerization (IP) technology, which is not stable in oxidative chemicals. In this paper, a novel layer-by-layer (LBL) self-assembled NF membrane prepared by coating poly(vinylbenzyltrimethylammonium chloride)/poly(styrene sulfonic) (PVBTMAC/PSS) on a polyethersulfone (PES) substrate was presented with exceptionally high permeance and oxidation resistance. The optimized NF membrane of [PVBTMAC/PSS] 8.5 demonstrated a pure water permeance (PWP) of 47.6 L/(m 2 ·h·bar) and nearly 100% rejection for various dyes. The PVBTMAC/PSS membrane showed distinct rejection to asymmetric salts (MgCl 2 , Na 2 SO 4 ) following Donnan exclusion. Excellent chlorine resistance was found after 150,000 ppm·h sodium hypochlorite treatment for both [PVBTMAC/PSS] 8.5 and [PVBTMAC/PSS] 9 , demonstrated by the stable rejection to MgSO 4 and prussian blue (PB) dye with reduced pore size. Declined rejection to MgCl 2 and increased rejection to Na 2 SO 4 was explained by oxidation of the highly active α-H on the aromatic ring side group of PVBTMAC to -COO − and Donnan exclusion effect. The integrity of LBL NF membranes was caused by additional π-π stacking between the polyelectrolytes. Both membranes demonstrated good long-term operational stability for dye separation with great potential for real applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yang Li,Shibin Wang,Jianchun Guo,Ruiyang Chen,Feng Zhao,Yuxuan Liu
Hydroxypropyl guar gum (HPG) is commonly used as the thicker of the fracturing fluid. It will be adsorbed on the sandstone that leads to decrease the permeability of the reservoir. Therefore, it is necessary to reduce the adsorption of HPG to decrease the permeability damage. The effect of silica nanoparticles (SNP) on the adsorption properties of HPG has been studied. X-ray photoelectron spectroscopy is employed to confirm the interaction force between HPG and sandstone. It is clear that hydrogen bonds is an important force of adsorption between HPG and sandstone. SNP can break hydrogen bonds between HPG and sandstone by occupying the rock surface, while altering the wettability of the rock. This results in effectively reducing the amount of HPG adsorption and retaining larger pores of the core after flooding with fracturing fluids. Adding SNP to HPG is an effective method to reduce reservoir damage.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）