SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Meng-Chao Yu,Xiaojie Xu,Tao Wang,Ying-Nan Feng,Zhi-Ping Zhao
Membrane distillation has long been a potential desalination technology. Recently, spray-assisted non-solvent induced phase inversion (SANIPS) was proposed as a facile and effective method to prepare microporous hydrophobic membranes for membrane distillation. However, the membrane formation process is not fully disclosed. In this paper, SANIPS is employed to fabricate hydrophobic PVDF membranes. The influencing factors on membrane structure and performance are investigated. Membrane structure is greatly affected by the choice of solvent and non-solvent spray. The interactions between different non-solvent sprays (water and ethanol) and solvents (TEP, NMP and DMF) and the effects of operating conditions on membrane formation are explored. Thermodynamic and kinetic analyses of the membrane formation process suggest that the membrane formation process is dominated by the kinetic factors with water being the spray while thermodynamic factors play the major role with ethanol being the spray. A hydrophobic membrane with water contact angle of 135.93 ± 4.38° and LEP of 2.5 ± 0.4 bar was successfully prepared by using ethanol as the non-solvent spray, which demonstrates a stable desalination performance (initial flux of 19.88 ± 1.39 kg·m −2 ·h −1 and salt rejection higher than 99.97 %) in vacuum membrane distillation. This study may provide pertinent insights into the rational control of membrane structure and performance of hydrophobic PVDF membranes.
研究领域:
化学工程
·
材料科学
·
海水淡化技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Dongbo Wang,Xuan Zhou,Yanbo Liu,Mingyang Chen,Dandan Han,Junbo Gong
With the rise of research on functional sugar, we found that preparing crystalline powders into spherical crystals will significantly improve quality, stability, appearance, and texture. In this work, d-ribose (D-RIB) spherical crystal aggregates were prepared for the first time. And D-RIB spherical crystal aggregates with superior filterability, flowability, and tap density can be prepared in ethanol, 1-propanol, and isopropanol. Specifically, we used ethanol as an example to reveal the formation mechanism of D-RIB spherical crystal aggregates: solvent-induced crystal defects, which in turn trigger noncrystallographic branching and further spherulite growth. Finally, a comparison of the properties of the D-RIB spherical crystal aggregates with those of commercially available products is given, demonstrating the fabrication of D-RIB spherulites with better tap density and flowability by solvent-induced noncrystallographic branching. This will provide a new insight into the preparation of high-quality D-RIB crystals.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Ruoxing Liao,Yumin Guo,Liqiu Yang,Haoli Zhou,Wanqin Jin
Membrane technology , a successful technology for separating gases such as CO 2 /CH 4 mixture, has attracted much attention because of its low energy consumption, and membrane performance is an important factor affecting its industrial application. Herein, the solvent-induced microstructure of a polyimide membrane was employed to enhance its CO2/CH4 separation performance. The effect of solvents on the membrane structure and gas separation performance was investigated by using different solvents (such as tetrahydrofuran, N,N-dimethylacetamide) to dissolve a newly synthesized polyimide polymer, which was fabricated into a membrane. Various characterization methods, such as positron annihilation lifetime spectroscopy (PALs) and X-ray diffractometry (XRD), were conducted to reveal changes in the microstructure of membranes prepared with different solvents. The interaction of solvents with groups of polymer backbones was also analyzed for the explanation of the effect of solvents on the membrane performance for the separation of different gas pairs, such as CO2/CH4 mixture. The results showed that a membrane with optimal separation performance was obtained by optimizing the solvent composition, which exceeded the 2018 mixed-gas CO2/CH4 upper bound. The induced effect of solvents on the polymer membrane structure provides a new research path for the optimization of polymer membranes to enhance separation performance.
研究领域:
材料科学
·
化学工程
·
气体分离技术
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 15
·2540-2546
·
IF 7.411
Chunhong Chen,Xuefeng Li,Jiang Deng,Zhe Wang,Yong Wang
Graphical Super Bowl C ! Non-centrosymmetric nanospheres are prepared by a soft-templating method using biomass as a precursor. Post-treatment of the nanospheres with different solvents can result in retention of the spherical structure or a shapeshift into nanobowls. The nanobowls are used as a support material for loading a CoS 2 catalyst and show excellent activity for the selective hydrogenation of aromatic nitro compounds. The realization of asymmetric hollow carbonaceous nanostructures remains a great challenge, especially when biomass is chosen as the carbon resource through hydrothermal carbonization (HTC). Herein, a simple and straightforward solvent-induced buckling strategy is demonstrated for the synthesis of asymmetric spherical and bowl-like carbonaceous nanomaterials. The formation of the bowl-like morphology was attributed to the buckling of the spherical shells induced by the dissolution of the oligomers. The bowl-like particles prepared through this solvent-driven approach demonstrated a well-controlled morphology and a uniform particle size of approximately 360 nm. The obtained nanospheres and nanobowls were loaded with CoS 2 nanoparticles to act as heterogeneous catalysts for the selective hydrogenation of aromatic nitro compounds. As expected, the CoS 2 /nanobowls catalyst showed good tolerance to a wide scope of reducible groups and afforded both high activity and selectivity in almost all the tested substrates.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 8
·2437-2443
·
IF 4.174
Chun-Xin Jin,Yu Wang,Qiu-Shan Gao,Dan-Yang Yao,Si-Hong Wang,Donghao Li,Hai-Bo Shang
Exploring new zeolitic imidazolate frameworks (ZIFs) with specific topologies and pore structures is important for extending applications and improving performances. In this work, a new farfalle-shaped ZIF with an ordered hierarchical structure (named ZIF-F) was easily built with zinc acetate and 2-methylimidazole (MeIm) in an aqueous system at room temperature. The synthesis mechanism of ZIF-F is a dual-induction interaction of a solvent and zinc source based on the synthesis protocol of ZIF-8. The prepared ZIF-F is a 3–5 μm dispersible particle constructed from numerous nanoplates with the same building units as ZIF-8. ZIF-F has a rich 4 nm inter-particle spacing with a 0.1074 cm3 g−1 total pore volume and exhibits high thermo- and solvent stability. It is worth noting that crystal transformation could occur from ZIF-F to ZIF-8 in methanol via the dissolution-recrystallization route. Regarding the adsorption of Congo red (CR), ZIF-F exhibits better adsorption capacity (182.82 mg g−1) than ZIF-8 (149.25 mg g−1) with 6 times higher adsorption rate than that of ZIF-8 because of the positive effect of its larger pore size and hierarchical structure.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Hai-Ming Song,Cheng Chen,Xiao-Xue Shui,Hao Yang,Li-Jing Zhu,Zhi-Xiang Zeng,Qun-Ji Xue
Although Janus membranes have been fabricated for the separation of oil/water mixtures, simplifying the construction processes is still a thorny challenge. In this work, a facile and easily scale-up approach based on in situ mussel-inspired chemistry is reported for the first time to prepare the Janus membrane with unidirectional oil/water separation. Here, the poly (vinylidene fluoride)/polydopamine/polyethylenimine (PVDF/PDA/PEI) membranes on the polyester non-woven fabric were fabricated via non-solvent induced phase separation (NIPS) technique. In the coagulation bath, the reactive oxygen species (ROS) produced by CuSO 4 /H 2 O 2 improved the formation of the hydrophilic PDA/PEI on the top surface of the membrane. The hydrophobic bottom surface was received after the membrane was stripped from the supporting fabric. Scanning electronic microscopy (SEM), confocal laser scanning microscopy (CLSM), attenuated total reflectance Fourier transform infrared spectrometer (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS) were used to characterize the membrane. The Janus membrane showed asymmetric wettability with 152.2° underwater oil contact angle of F-T5 and 153.3° underoil water contact angle of B-T5. Furthermore, by this in situ mussel-inspired chemistry, the Janus membrane showed excellent water and oil separation, antifouling performance and stability, which can potentially be used for unidirectional oil/water separation.
研究领域:
材料科学
·
环境科学
·
界面化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiajing Zhang,Zhuan Fu,Qimeng Zhu,Sijie Zhou,Liangjun Xia,Chunhua Zhang,Xin Liu,Weilin Xu
Textile composites are ubiquitous in daily life and are one of the main ways in which bacteria and viruses spread. Highly effective antibacterial and antiviral flexible composites are effective for reducing microbe transmission. Herein, we reported an improved nonsolvent-induced phase separation method for the fabrication of flexible textile composites. Cu 2 O/polyurethane (Cu 2 OPU) composite films containing antibacterial and antiviral coatings were constructed using a Cu 2 O-polyvinyl butyral coagulation bath and binary solvent mixtures, yielding a composite that had excellent mechanical properties and stability and the components did not leach out. The as-prepared Cu 2 OPU composite films exhibited strong antibacterial and antiviral activity against Staphylococcus aureus and the H1N1 virus (above 99.99 % inactivation ratio). What’s more, Cu 2 OPU has excellent mechanical and environmental stability owing to the strong interfacial adhesion of Cu 2 O with the polymer matrix. Furthermore, it can withstand multiple washes and be suitable for daily use. Cu 2 OPU may be sustainably produced with great scalability, which may meet public, home, and textile applications.
研究领域:
材料科学
·
生物医学工程
·
纺织科学
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2016
·
IF 3.897
Ailin Gao,Qing Yang,Lixin Xue
The crystallinity of semi-crystallized Poly ( l -Lactic acid) (PLLA) is low, especially as a porous membrane prepared from non-solvent induced phase separation (NIPS) process. To improve the crystallinity and thermal stability of PLLA porous membranes, hexafluoroisopropanol (HFIP) was added into the PLLA casting solution together with a small amount of Silk Fibroin (SF). It is found that by optimizing the additive amounts of HFIP and SF, PLLA composite membranes with improved crystallinity (up to 47.1%) and endurance to temperature (above 90 °C) could be prepared with comparable mechanical property to the virgin PLLA membranes. The effects of HFIP in NMP solution on PLLA during the NIPS process was further investigated using dynamic rheological methods relating to the crystallinity of the formed PLLA porous membranes.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yulin Wu,Yixing Wang,Fang Xu,Kai Qu,Liheng Dai,Hongyan Cao,Yongsheng Xia,Linfeng Lei,Kang Huang,Zhi Xu
Covalent organic frameworks (COFs) are porous crystalline polymers with uniform pore channels and excellent stability, holding great promise in the field of membrane. The liquid-liquid interfacial polymerization is designed as an effective and convenient approach to preparing COF membranes, but the crystallinity of membranes synthesized by this method tends to be poor and thus superiorities of COF crystalline channels can hardly be utilized. In this work, a solvent-induced interfacial polymerization strategy was proposed to prepare COF membranes with high crystallinity. Due to the interaction between the acetonitrile solvent inducer and COF network, the reaction and self-assembly in film formation process were effectively manipulated. The optimized COF membrane exhibited much higher crystallinity and porosity, whose surface area was about an order of magnitude higher than the membrane prepared in the traditional system. The highly crystalline COF membrane showed significantly improved separation performance in desalination. This work provides a powerful strategy to prepare COF membranes with high crystallinity.
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
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Dong Yang,Peng Rong,Chunhui Jiang,Pengqing Liu,Mengjin Jiang,Shengchang Zhang
The stability demand of polymeric membrane separation systems used in harsh environments, including high temperature, high pressure, extreme acid, and high salinity, makes the role of polyarylate (PAR) porous membranes more and more crucial. Herein, the PAR ultrafiltration membrane is fabricated from the nonsolvent-induced phase separation (NIPS) method in a simple, high-efficiency way. In order to study the evolution mechanism of cross-sectional pore morphologies during the NIPS process, different coagulation conditions, including the PAR concentration in casting solution, the coagulation temperature, and the addition of different hydrophilic additives (PEG400, PEG4000, PEG20000, and PVP), are applied. Next, the morphologies and membrane performances of various PAR membranes are analyzed by scanning electron microscopy, porosity measurement, N2 isotherm adsorption–desorption measurement, water flux measurement, bovine serum albumin (BSA) separation measurement, and mechanical test. Based on these measurements, the formation rule of different pore morphologies in the cross section of PAR membrane was clarified, and the effects of different cross-sectional morphologies on the permeability, filterability, and mechanical properties of the resultant membranes are pointed out. The viscosity effect from a higher PAR concentration and a higher hydrophilic additive concentration in a casting solution can delay the formation of the outer layer and limit the nucleation growth process of the nonsolvent, then allowing the formation of near-surface sponge-like pores and fewer inner macropores. Moreover, not only the increase of the bath temperature but also the strengthening hydrophilicity of the casting solution can accelerate the double-diffusion rate and the growth process of nuclei, thereby promoting the formation of near-surface finger-like pores and more inner macropores. Combined with the enhancement of membrane hydrophilicity, these pores as channels can accelerate the passage of water through the PAR membrane. For the PAR16–PVP10-30 membrane, not only a 120 L·m–2·h–1·bar–1 of water flux but also a close to 100% of BSA rejection ratio is obtained. Although the formation of near-surface sponge-like pores and fewer inner macropores deteriorate the membrane’s permeability, the high BSA rejection ratio and the improved mechanical property can be maintained. Finally, the optimization component of the casting solution for fabricating a PAR ultrafiltration membrane with enough permeability, high selectivity, and suitable mechanical property adds 10 wt % PVP in the solution of 16 wt % PAR, ensuring the solid hydrophilic effect and moderate viscosity effect.
研究领域:
材料科学
·
膜分离技术
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Polymeric Materials and Polymeric Biomaterials
·
2017
·
IF 1.515
Ping Jiang,Jinlong Zhang,Shan Shan Jia,Yiqiang Wu,Qinlin Wu
First, ethyl cellulose-g-poly(2-(dimethylamino) ethyl methacrylate) (EC-g-PDMAEMA) was synthesized through atom transfer radical polymerization. Second, the polymer was used to prepare self-supporting microporous membranes through nonsolvent-induced phase separation process. The chemical structures of EC0.2-g-PDMAEMA15 was confirmed by 1H NMR and FTIR. And the copolymer micelles were characterized by UV, laser particle-size analysis, and TEM. The results indicated that the copolymer had pH- and temperature-responsive behaviors. Furthermore, the morphology study of microporous membranes indicated that the pores became smaller and more uniform with the increase of tetrahydrofuran (THF) content and “open time”, and the most optimal preparation conditions were using 75% THF/25% DMF (v/v) as solvents with the “open time” 30 s. What’s more, the membranes were responsive to pH and temperature stimulus in terms of water flux.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xintao Deng,Yingpeng Zhao,Fuyuan Yang,Yangyang Li,Minggao Ouyang
The finger-like pore (FP) is one of the most important phenomena in the fabrication of membranes via nonsolvent induced phase separation (NIPS), as the performance of most functional membrane is heavily dependent on the appropriate regulation of the FPs. However, the mechanisms governing the initiation and growth of FPs are still not fully understood, and their regulation often relies on empirical knowledge and practice. This study presents the development of a hydrodynamics-coupled phase-field model that reproduces the process of FP initiation and parallel growth from the dense skin layer. The evolution process of the finger morphology and the impact of various manufacturing parameters are investigated. Optical observations are conducted and compared with simulated morphologies under different parameter conditions, revealing that the simulations mirrored the effects of these parameters, as seen in actual processes.
研究领域:
材料科学
·
化学工程
✓ 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）