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
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Xuehua Ruan,Xinfang Zhang,Xuhang Liao,Xiaobin Jiang,Yan Dai,Xiaoming Yan,Gaohong He
Zeolitic imidazolate framework-8 (ZIF-8) with regular pore size (~ 0.34 nm) is widely attempted for gas separation membranes based on size sieving. However, the prospect is subjected to fabricating the continuous ZIF-8 membranes with high mechanical stability and uniformity. In response, an adhesive layer of Zn(II)-doped polydopamine (Zn-PDA) is pre-coated on the stainless steel nets in this work to improve ZIF-8 nucleation and growth. Zn-PDA layer shows high tolerance to ultrasonic agitation and heated methanol (system for ZIF-8 synthesis), little dissolution within 24 h, which supplies a high stable surface for ZIF-8 growth. Furthermore, the Zn(II) doped in PDA layer is opportunely serving as the even-distributed ZIF-8 nucleation starting sites, verified with the EDX and FE-SEM images for the aggregated Zn(II) clusters and the nascent ZIF-8 crystals. Therefore, an indented and hinged boundary is constructed between ZIF-8 and substrate to enhance the mechanical stability. The FE-SEM images after ultrasonic agitation show that the continuous ZIF-8 membranes prepared on Zn-PDA layers can tolerate the deformation to a certain extent. Finally, the prepared ZIF-8 membranes behave excellently with α H2/CO2 = 9.9, α H2/CO = 17.2, α H2/CH4 = 26.0, and permeation rate J H2 = 3980 GPU. This work supplied a useful approach to enhance mechanical stability and uniformity of defect-free ZIF-8 membranes.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chunxin Jin,Shuai Liu,Rui Zheng,Yanhong Li,Xiaofang Chen,Jürgen Caro,Jianwen Jiang,Aisheng Huang
Metal-organic framework (MOF) membranes have showed great potential in gas separation. To date, it is still a great challenge to precisely control the optimal orientation of MOF membranes with an enhanced gas separation performance. Herein, we prepared a compact and (110) oriented ZIF-8 membrane with a thickness of about 265 nm on graphite substrate within 1 h at room temperature via electric-field-driven strategy. Since the membrane is an intergrown one-crystal layer, grain boundary retardation of the flux is eliminated. Furthermore, due to the reduction of the transport pathways through the oriented structure, the (110) oriented ZIF-8 membrane exhibits a high gas separation performance. At 100 °C and 1 bar for the separation of equimolar binary gas mixtures H 2 /CO 2 , H 2 /CH 4 and H 2 /C 3 H 8 , separation factors of 49.5, 90.9 and 121.8 can be obtained, with H 2 permeance of about 1.7 × 10 -7 mol·m −2 ·s −1 ·Pa −1 . The developed strategy exhibits excellent reproducibility and scalability, and a large area ZIF-8 membrane can be consistently prepared on the graphite substrate, thus facilitating the preparation and application of the ZIF-8 membrane on a large scale. Further, the electric-field-driven strategy is also helpful for the preparation oriented ZIF-67 and ZIF-L membranes, confirming its versatility for the preparation of oriented MOF membranes.
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
JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Jie Peng,Huiping Zhang,Ying Yan
A new method was employed to synthesize a novel high voidage ZIF-8 membrane over paper-like stainless steel fibers (PSSF). Firstly, paper-like stainless steel fibers (PSSF) were prepared by wet lay-up papermaking and sintering process , then the ZIF-8 membrane was coated on the PSSF support by secondary growth process. The effects of the seed layer growth time, the Hmim (2-methylimidazole)/Zn (Zinc nitrate hexahydrate) molar ratios , the solvothermal synthesis temperature and time on properties of ZIF-8 membrane/PSSF composites were investigated by modern characterization methods. The experimental results indicated that the void volume of ZIF-8 membrane/PSSF composites reached 89%. The optimal specific surface area of composites was 398 m 2 /g and the total pore volume was 0.174 cm 3 /g. Specifically, the size of seeds were approximately 250 nm when Hmim/Zn molar ratios and seed layer deposition time were 80 and 12 h, respectively. Under the condition of optimal seed layer, ZIF-8 membrane/PSSF composites showed outstanding continuity, compactness, free-defect and crystal shape when solvothermal synthesis time and solvothermal synthesis temperature were 24 h and 100 °C, respectively.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yongjiang Shan,Mingliang He,Fei Zhang,Yifei Wang,Yuxin Liu,Yingdong Yang,Xingqian Wang,Xinkang Zhang,Yuqin Li,Zhipeng Wang,Xiangshu Chen
Well-intergrown MOF membranes were challenging to construct using the in-situ approach, due to the poor heterogeneous nucleation of MOF on the supports. Here, we described a technique to manufacture ZIF-8 membranes devoid of induced seeds using support modified by O 2 plasma for the first time. O 2 plasma can increase the number of oxygen-containing functional groups (–OH) on the support surface that could absorb zinc ions from synthesizing solution and offer heterogeneous nucleation sites for the formation of ZIF-8 membranes. The as-synthesized membrane exhibits outstanding gas permeation performance with a high hydrogen permeance of about 2.22 × 10 −7 mol·m −2 ·s −1 ·Pa −1 and a high H 2 /CH 4 ideal selectivity of 25.91. The separation factor of the equimolar H 2 /CO 2 and H 2 /CH 4 mixtures reached 8.72 and 31.03 at 298 K and 0.1 MPa, respectively. In addition, this new technique also allowed for the synthesis of ZIF-67 membranes, and the prepared membrane had an H 2 /CH 4 ideal selectivity of 14.92. This work develops a new route for the efficient fabrication of MOF membranes.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Ziheng Li,Yan Dai,Xuehua Ruan,Xiangcun Li,Miao Yu,Tiantian Li,Xiujuan Zhang,Xiaobin Jiang,Xuemei Wu,Wenji Zheng,Gaohong He
Defect-free MOFs membrane on flexible substrate is challenging and promising for industrial applications. In this work, electrospun nanofiber substrates were employed to construct deep-rooted and defect-free ZIF-8 membranes by a symbiotic layer composed of interpenetrated nanofibers and ZIF-8. Nanofibers provide sufficient nucleation sites to construct an interpenetrated “symbiotic layer”, which further supports ZIF-8 growing to be defect-free. Importantly, benefiting from this symbiotic layer, the rigidity difference between substrate and ZIF-8 is well balanced, resulting in ZIF-8 membrane deep-rooted within the support. Furthermore, tannic acid (TA), was combined to modulate the surface chemistry and inter-crystalline defects of ZIF-8 membranes. Finally, a hierarchical ZIF-8 membrane with nanofibers as flexible substrates were obtained. The prepared PAN/TA 2 -NZIF-8 0.25 membrane exhibits H 2 permeance of 2408 GPU and H 2 /CO 2 selectivity of 21.80. Specifically, compared with the reported MOFs membrane for H 2 separation, the H 2 permeance of this work locates in a very high region, while proper H 2 /CO 2 separation factor is still remained, exceeding the 2008 upper bound of H 2 /CO 2 separation. Importantly, this membrane presents stable microstructures and separation performance after twisting. The proposed deep-rooted and defect-free ZIF-8 membrane on flexible substrate is competitive to achieve industrial application.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Jui-Yeh Rau,Yulin Xie,Zhujian Mao,Youyi Wang,Jiayi Hao,Shihan Cai,Jian Huang
The development of high-performance hydrogen separation membranes is a crucial step in the advancement of sustainable energy technologies and the achievement of carbon neutrality. In this study, zeolitic imidazolate framework-8 (ZIF-8) membranes with an ultra-high selectivity for hydrogen over carbon dioxide were successfully synthesised on polydopamine/3-aminopropyltriethoxysilane (PDA/APTES) modified Al 2 O 3 supports. The interfacial layer exhibited excellent adhesion and a high density of functional groups, which served as nucleation sites for the growth of ZIF-8 crystals. The resulting membranes exhibited a dense and defect-free structure, achieved through an optimised 12 h in-situ growth process. The membranes exhibited excellent gas separation performance, with hydrogen(H 2 ) permeance reaching 14 × 10 −7 mol·Pa −1 ·m −2 ·s −1 and ideal selectivities of 20.3, 22.1, and 26.8 for H 2 /CO 2 , H 2 /N 2, and H 2 /CH 4 , respectively, at 25 °C and 0.2 MPa. In comparison with the ZIF-8 membrane that was synthesised on a pure PDA modified layer, the H 2 permeance increased by 14.8 %. Notably, the selectivity for H 2 /CO 2 increased by almost threefold. Moreover, long-term stability tests demonstrated the durability and robustness of the ZIF-8 membranes under operational conditions.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Changdie Cao,Yali Zhao,Yurun Dai,Yanying Wei,Qibin Xia,Haihui Wang
Sulphur hexafluoride (SF 6 ) is a commonly utilized insulation gas in electrical equipment because to its superior insulating capabilities and arc extinguishing characteristics, which holds high recycling value and necessity from the economic and environmental perspective. However, traditional method of recovering SF 6 based on cryogenic distillation is energy consuming, alternative separation technic is urgently required. Herein, a variety of ZIF-8 membranes fabricated via fast current-driven synthesis are proposed for N 2 /SF 6 separation. For a typical insulation gas in gas insulated switchgear comprising 70 % N 2 and 30 % SF 6 , the ZIF-8 membrane presents a N 2 /SF 6 selectivity up to 809 and a high N 2 permeance of 557 GPU with outstanding pressure resistance, which indicates that the ZIF-8 membrane separation would be an excellent new route for highly efficient SF 6 recovery.
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
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Taotao Ji,Jiahui Yan,Yongfu He,Wenjing Hu,Yuan Peng,Weishen Yang,Yi Liu
Despite their huge potential in C 3 H 6 refinement, ZIF-8 membranes still struggle to achieve stable production of high-purity C 3 H 6 , owing to their fluctuant performances under changing operating conditions. In this study, a previous low-temperature synthetic protocol was further optimized to improve the microstructure of ZIF-8 membranes for pressure-resistent C 3 H 6 /C 3 H 8 separation through precisely regulating the reaction temperature between −15 °C and 5 °C. The elevation of reaction temperature gave rise to reduced grain boundary defects at the cost of increased membrane thickness. Of particular note, carrying out reaction between −2.5 °C and 2.5 °C assured an exact balance between upward intergrowth and inner penetration and thus, the formation of well-intergrown semi-confined ZIF-8 membrane featuring pressure-resistant C 3 H 6 /C 3 H 8 separation even at operating temperature as high as 125 °C. At feed pressure of 7 bar, our membrane remained a separation factor approaching 190 with C 3 H 6 permeance up to 2.9×10 -8 mol m -2 s -1 Pa -1 , thus demonstrating the best separation performance under similar test conditions. Moreover, our membrane could maintain a stable separation capacity at C 3 H 6 feed fraction of 1%–99%, which has never been addressed in previous literature. The above stable and outstanding separation performance recommend our membrane a superb choice for reliable batch production of high-purity C 3 H 6 .
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2018
·
IF 3.306
Jiamin Hou,Yanying Wei,Sheng Zhou,Yanjie Wang,Haihui Wang
We propose a strategy for rapid in situ fabrication of zeolitic imidazolate framework-8 (ZIF-8) hybrid membrane with assistance of the two dimensional (2D) graphitic carbon nitride (g-C 3 N 4 ) nanosheets at room temperature. The negatively charged g-C 3 N 4 nanosheets with abundant nitrogen coordinating sites are capable to capture and anchor Zn 2+ and thus provide a large number of heterogeneous nucleation sites for the formation of initial ZIF-8 crystals. During the cyclical spin coating of the Zn 2+ /g-C 3 N 4 nanosheets and the ligand (2-methylimidazole), the in situ formed ZIF-8 crystal nucleus on g-C 3 N 4 nanosheets promote the further growth of continues defect-free membranes. The ZIF-8/g-C 3 N 4 membrane with thickness of ∼240 nm can be obtained using this strategy within 30 min at room temperature, which is attractive for fast and facile preparation of molecular sieving membranes. Moreover, it exhibits promising H 2 /CO 2 separation performance with the selectivity up to 42, which is superior to many other ZIF-8 membranes.
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
AICHE JOURNAL
·
2022
·Vol. 69
·期 4
·e17934
·
IF 4.167
Yali Zhao,Xiayi Yang,Jiayu Luo,Yanying Wei,Haihui Wang
MOF membranes are very promising in molecular separation, but it is still a challenge for industrial applications due to the complex and time-consuming synthesis. We use the fast current-driven synthesis (FCDS) method to achieve controlled growth of ZIF-8 membranes on porous graphite-coated ceramic tubes by controlling the growth time and current density. Grown for 30 min at a current density of 0.74 mA/cm 2 , the ZIF-8 membrane exhibits selectivity for C 3 H 6 /C 3 H 8 up to 63 with C 3 H 6 permeance of 6 × 10 −9 mol/(m 2 s Pa). Furthermore, the ZIF-8 membrane exhibits a pressure resistance of up to 3 bar and good stability of ~96 h. This work realizes the breakthrough of the MOF membrane synthesis via FCDS method from the frequently-used expensive and fragile anodic aluminum oxide (AAO) disc substrate to the tough ceramic tubular substrate, which broadens the road for the industrialization of MOF membranes in gas separation fields.
研究领域:
材料科学
·
化学工程
·
分离技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yawei Gu,Jingxian Hua,Jinfeng Chen,Wenyi Zhu,Rujing Hou,Chongqing Wang,Yichang Pan
ZIF-8 membranes are promising for C 3 H 6 /C 3 H 8 separation due to its proper pore size between C 3 H 6 and C 3 H 8 . However, challenges from the defective grain-boundary (poor reproducibility), inferior pressure-resistant, and insufficient synthesis parameters regulation hinder its advancement. Herein, we demonstrate an interface engineering method that can simultaneously deal with these two issues by coating a polymeric layer on the surface of ZIF-8 membrane which can seal the grain boundaries and lock the pressure-induced linker rotation. Accordingly, by optimizing the polymer chain rigidity and the corresponding thickness layer, the resultant membrane with locked rigid interface demonstrates desired C 3 H 6 permeance and C 3 H 6 /C 3 H 8 separation factor above 45 GPU and 105, respectively, and stabilized performance up to 7 bar. Such performance is superior to most of the recently reported work in the literature. This strategy provides inspiration for considering the polymer chain rigidity regulation in the membrane coating layer and its effect on developing advanced composite membranes for energy-efficient separations.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）