CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Meihua Zhu,Xingguo An,Tian Gui,Ting Wu,Yuqin Li,Xiangshu Chen
Pervaporation performance of NaY zeolite membranes is improved by ion-exchange with di-valent nitrate salt . Different nitrate salts, including Co(NO 3 ) 2 , Mg(NO 3 ) 2 , Zn(NO 3 ) 2 , Ca(NO 3 ) 2 , Cu(NO 3 ) 2 , KNO 3 , and AgNO 3 , have great effects on the channel structure and water affinity of the NaY zeolite membrane. When the concentration of nitrate salt, ion-exchange temperature and time are 0.1 mol·L −1 , 50 °C and 2 h, the ion-exchange degree order of NaY zeolites is Ag + > K + > Ca 2+ > Zn 2+ ≫ Co 2+ > Mg 2+ . Especially, Ag + and K + cation exchange degree of NaY zeolites are achieved to 96.54% and 82.77% in this work. BET surface, total pore capacity, pore size distribution and water contact angle of the ion-exchanged NaY zeolites are all disordered by mono- and di-valent cations. Di-valent nitrate salt is favor for increasing the dehydration performance of NaY zeolite membranes by ion-exchange. When the ion-exchange solution is Zn(NO 3 ) 2 , the total flux variation and separation factor variation of the NaY membrane (M-5) are −45% and 230% for separation of 10% (mass) H 2 O/EtOH mixture by pervaporation, and the ion-exchanged membranes showed good reproducibility.
研究领域:
材料科学
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膜分离技术
·
无机非金属材料
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化学工程
·
纳米材料
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吸附与扩散
·
界面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Siyu Pang,Zhihao Si,Guozhen Li,Hanzhu Wu,Yuhui Cui,Changwei Zhang,Cong Ren,Shuai Yang,Shusheng Pang,Peiyong Qin
A high-quality mixed matrix membrane (MMM) with high flux and separation factor is fostered to enhance ethanol pervaporation . In this study, a fluorinated and defect-free ZIF-8/PDMS membrane was prepared by the covalent bonding among fluoromonomer, ZIF-8 particles and PDMS using a one-pot method. ZIF-8 is first modified with 3-amino-1,2,4-triazole (Atz) to graft –NH 2 groups, and then modified with glycidyl methacrylate (GMA). This was achieved by the amine-epoxide addition reaction (named GZIF-8) to facilitate covalent bonding with methacrylate-functionalized PDMS, where the interfacial compatibility ZIF-8 and PDMS is improved. Moreover, 1H,1H,2H,2H-perfluorooctyl methacrylate (13F) as F-monomer is introduced into the membrane formation process by the polymerization of methacrylate groups among 13F, ZIF-8 and PDMS, where a fluorinated structure with high hydrophobicity and low surface energy is formed. The pervaporation performance for a 5 wt% ethanol solution at 60 °C shows that the resulting MMM has a high separation factor of 9.5 and total flux of 1681 g m −2 h −1 under the optimized parameters of 3 wt% GZIF-8 loading and 12 wt% 13F amounts.
研究领域:
材料科学
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化学工程
·
膜技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Ziqiang Tong,Xiufeng Liu,Baoquan Zhang
By utilizing the synergistic effect of polyelectrolyte (PEL) and sulfonated graphene oxide (SGO), novel composite membranes were prepared to achieve ultrafast transport of water molecules in isopropanol pervaporation dehydration. As confirmed by FTIR, Raman, XPS and XRD measurements, the sulfonation modification resulted in defects and uneven interlayer structure within SGO membrane (SGOM), which could enlarge the free volume for low-resistance water channels. The microstructure changes of composite membranes were observed via FESEM . The measured pervaporation behavior of pure components indicates that the transport capacity of SGOMs has been enhanced compared with graphene oxide membranes. After coated with an ultrathin PEL layer, the synergistic effect of highly enhanced water adsorption from the PEL layer and ultrafast permeation channels from SGOM facilitates the rapid and selective transport of water molecules through the membrane, which ensures excellent isopropanol dehydration performances. Both the flux and separation selectivity increase with temperature. At 70 °C, the flux can reach up to 3.67 kg m −2 h −1 with 99.90 wt% water content in permeate. The prepared membrane also possesses enhanced mechanical strength with firm interfacial adhesion. All the results evidence that SGO-based membranes possess outstanding advantages in isopropanol dehydration.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2019
·Vol. 65
·期 8
·e16620
·
IF 3.463
Xiaoxu Zhao,Hao Zhang,Sheng Xu,Yan Wang
In this study, a novel covalent-assisted seeding method is developed to fabricate well-intergrown ZIF-8 membrane on polyimide (PI) substrate with imidazole-2-carboxaldehyde (ICA) as the covalent agent between ZIF-8 layer and PI substrate. Compared to ethylenediamine-crosslinked PI membrane and ZIF-8/PI membrane synthesized without covalent-assisted seeding method, ZIF-8/PI membrane synthesized with ICA covalent-assisted seeding method shows improved pervaporation performance for isopropanol dehydration. Subsequent surface coating with polydimethylsiloxane or polydopamine is applied to mitigate the grain boundary of ZIF-8/PI membrane, which results in a further performance enhancement. The morphologies and physicochemical properties of the resultant membranes are characterized by scanning electron microscope, attenuated total reflectance-Fourier transform infrared, X-ray diffraction, and water contact angle. The effect of operation temperature on the separation performance is also carried out. This work demonstrates the novel covalent-assisted seeding method for the preparation of ZIF-8 membrane with high-performance, which may hold a great potential for various ZIF membranes separation applications.
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
Jiahua Yan,Zhongxiao Du,Zijian Yu,Bing Cao,ThiThi Mar,Dujian Qin,Rui Zhang
Pervaporation (PV) is characterised by good hydrophilicity and antifouling properties. However, it is still unavoidable to need cleaning during long-term operation. Sodium hypochlorite (NaClO) is a commonly used purifying agent for organic pollutants , but it may cause damage to the polymer membrane. In this study, a grafting method was proposed to enhance the chlorine resistance and water permeability of membrane composite polyvinyl alcohol (PVA) pervaporation membrane. Modified PVA (SPVA) was prepared by grafting 5-sulfosalicylic acid (SSA) to improve the hydrophilicity of the membrane using the sulfonic acid group on SSA. SPVA-FA/PTFE composite membranes were prepared by using perfluoroglutaric acid (PFGA) as crosslinking agent to improve the chlorine resistance of the membranes by utilising the C-F chain contained therein. The water flux was 120.38 ± 1.72 kg/(m 2 ·h), which was 84.2 % higher than that before grafting, when tested at 70 °C and 3.5 wt% NaCl. The chlorine resistance of SPVA-PFGA/PTFE composite membrane was tested in 2000 ppm (pH = 12) NaClO solution for 480 h, and the salt rejection remained above 99.93 %. When desalinating 20 wt% NaCl at 70 °C, the water flux of SPVA-PFGA/PTFE membrane is 51.95 ± 0.6 kg/(m 2 ·h), which has the potential to treat high concentration brine.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Chuan Ding,Xinru Zhang,Chuncheng Li,Xiaogang Hao,Yonghong Wang,Guoqing Guan
In recent years, zeolitic imidazolate framework-8 (ZIF-8) has received tremendous attention due to its hydrophobic inner channels and good compatibility with the polymer as an inorganic filler for preparation of the mixed matrix membrane (MMM). In this study, ZIF-8 particles were synthesized and incorporated into Ploy (ether block amide) matrix (PEBA-2533) to fabricate a MMM for the enhancement of phenol permselective pervaporation. The structure and morphology of ZIF-8 particle and the obtained MMMs were characterized by XRD, SEM, FTIR, contact angle and BET. It is found that the hydrophobicity of the membrane was enhanced by the incorporation of hydrophobic ZIF-8, and the obtained MMM withstand the extreme operation conditions of pervaporation. The effects of particle loading amount, feed concentration and temperature on the separation performance of ZIF-8 incorporated MMMs were investigated in details. Compared with the pure PEBA-2533 membrane, the permeate flux of ZIF-8 incorporated PEBA-2533 MMM with a 10 wt% loading amount was significantly increased from 846 g m −2 h −1 to 1310 g m −2 h −1 , while the separation factor increased from 39 to 53 at 70 °C with 8000 ppm feed phenol concentration. The enhancement of the pervaporation performance could be mainly attributed to the preferential highly permeable regions of the bimodal membrane structure for phenol molecules, which was consisted of ZIF-8 particles. Finally, both of the excellent overall membrane pervaporation performance and the long-term revealed that such a ZIF-8 incorporated MMM has a great potential in separation and recovery of phenol from its aqueous solution for a practical process.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Guanhua Liu,Zhongyi Jiang,Changdong Li,Lipeng Hou,Cheng Chen,Hao Yang,Fusheng Pan,Hong Wu,Peng Zhang,Xingzhong Cao
To synthesize small and evenly distributed fillers in polymer matrix is important to fulfill the advantage of nanocomposite membranes in overcoming the tradeoff effect between permeability and selectivity. In this study, nanocomposite membranes were prepared by synthesizing calcium oxalate (CaOx) nanoparticles in confined space of the layer-by-layer (LbL) self-assembled polymer network through bio-inspired mineralization. The active layer was tightly coated on hydrolyzed polyacrylonitrile substrate with thickness less than 200 nm. The CaOx nanoparticles were uniformly distributed in the polymer matrix with diameter less than 50 nm. The hydrophilicity of the nanocomposite membranes was decreased due to the incorporation of CaOx nanoparticles. And the free volume properties were tuned by creating new polymer/filler interface. At precursor concentration of 1 mM, the permeation flux increased by 14% to 958 g/(m 2 h), the separation factor increased by 2.36 times to 1562 compared to the control membrane, and the membrane showed good operating stability.
研究领域:
材料科学
·
纳米技术
·
膜技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2015
·Vol. 62
·期 5
·1728-1739
·
IF 2.748
Hao Zhang,Yan Wang
Ethanediamine-modified zeolitic imidazolate framework (ZIF)-8 particles (ZIF-8-NH 2 ) is synthesized and incorporated in the poly(vinyl alcohol) (PVA) matrix to fabricate novel PVA/ZIF-8-NH 2 mixed matrix membranes (MMMs) for pervaporation dehydration of ethanol. The PVA/ZIF-8-NH 2 MMMs exhibit enhanced membrane homogeneity and separation performance because of the higher hydrophilicity and restricted agglomeration of the particles, as compared to corresponding MMMs loaded with unmodified particles. The effect of ZIF-8-NH 2 loading in the MMMs is studied and the MMM with a 7.5 wt % ZIF-8-NH 2 loading shows the best pervaporation performance for ethanol dehydration at 40°C. Various characterization techniques (Fourier transform infrared, scanning electron microscope, contact angle, sorption test, etc.) are used to investigate the MMMs loaded with ZIF-8 and ZIF-8-NH 2 particles. The impact of operation conditions on pervaporation performance is also performed. The performance benchmarking shows that the MMMs have superior separation factors and comparable flux to most other PVA hybrid membranes. © 2016 American Institute of Chemical Engineers AIChE J , 62: 1728–1739, 2016
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
·
2016
·
IF 3.299
Xiaolu Wang,Jinxun Chen,Manquan Fang,Tao Wang,Lixin Yu,Jiding Li
In this contribution, zeolitic imidazolate framework (ZIF-7)/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) with uniformly dispersed ZIF-7 were fabricated. The homogeneous dispersion of ZIF-7 nanoparticles in PDMS matrix and better interface compatibility were characterized by SEM and EDS. PV performance reveals that the MMMs display increased total flux and the highest separation factor occurs at 20 wt% ZIF-7 loading, which were 1689 g m −2 h −1 and 66 respectively as compared to 1080 g m −2 h −1 and 51 for pure PDMS membrane when separating 1 wt% butanol aqueous solution at 60 °C. The total flux reaches 3496 g m −2 h −1 with 80 wt% butanol in permeate for the enrichment of 5 wt% butanol solution at 60 °C. The enhanced flux may result from enlarged free volume in the polymer matrix caused by the incorporation of ZIF-7 nanoparticles. Moreover, the super-hydrophobic ZIF-7 pore channels and butanol preferential permeation may contribute to the improvement of separation factor. The result also shows that there is a 21.1% reduction of energy barrier for penetrant transportation for 20 wt% ZIF-7 filled PDMS membrane as compared to pristine PDMS membrane. A long period of pervaporation experiment was also carried out to investigate the structure stability of the ZIF-7/PDMS membrane, and the MMM remains intact during the 240 h continuous operation, which is the key to industrial application for membrane-based separation process. All above indicated that ZIF-7 is a good filler to fabricate butanol permselective pervaporation membranes for butanol separation and enrichment.
研究领域:
材料科学
·
化工分离技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xinping He,Tao Wang,Jinghui Huang,Jinxun Chen,Jiding Li
Bio-ethanol, clean and renewable, has proved to be a promising alternative energy resource to replace conventional fossil fuels. In its continuous production via the fermentation–pervaporation process, hydrophobic polymer membranes such as polydimethylsiloxane (PDMS) have been developed to enrich ethanol from dilute fermentation broth. However, the efficiency of current ethanol recovery via pervaporation is not high enough for large-scale bioethanol production. To address this issue, we separately fabricated two types of lotus-inspired PDMS composite membranes to combine the beneficial properties (low surface energy and super-hydrophobicity) of superhydrophobic lotus leaves with the pervaporation process and optimized the separation performance. First, we prepared lotus leaf powder/PDMS mixed matrix membranes (MMMs) to exploit the intrinsic properties of lotus leaf’s material. In addition, polydivinylbenzene (PDVB)-coated PDMS composite membranes were fabricated to mimic and make use of the properties coming from the lotus leaf’s hierarchical structure. The morphology, surface chemistry, and pervaporation performance were systematically investigated for all the membranes. And results showed that MMMs at 1.5 wt% lotus powder loading displayed the ideal dispersion condition and increased the total flux of pervaporation process by 22% (750 g∙m −2 ∙h −1 , 6 wt%, 37 °C). For the PDVB-coated PDMS membrane, the hierarchical roughness was successfully established on the PDMS surface, which resulted in a super-hydrophobic surface with water contact angle higher than 150°. As PDVB also has preferential adsorption for ethanol, the PDVB-coated PDMS membrane showed a higher ethanol recovery performance with the separation factor and total flux increased by 13% and 30%, respectively. Therefore, it was demonstrated that PDVB coating is an effective method to fabricate superhydrophobic membranes and both the two lotus-inspired strategies are feasible in optimizing pervaporation performance for ethanol recovery.
研究领域:
材料科学
·
化学工程
·
生物能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Sihan Tang,Zhiyue Dong,Xiangwei Zhu,Qiang Zhao
Advanced membranes for pervaporation dehydration of acidic mixtures are demanded since the membrane swelling and stability in acidic feed differ from that in neutral feed. Herein we exploited poly(ionic liquid) complex (PILC) membranes featuring high dehydration performance in acidic conditions versus feed temperature and operation time. A poly(ionic liquid), i.e., poly[1-cyanomethyl-3-vinylimidazolium bromide] (PCMVImBr), was synthesized and complexed with sodium carboxymethyl cellulose (CMCNa) to prepare membranes. Chemical structures , compositions, microstructures and surface properties of PCMVIm-CMCNa PILC membranes were characterized by Fourier-transform infrared spectroscopy, element analysis , scanning electron microscopy, atomic force microscopy and water contact angle. The PILC membranes were efficient in dehydrating 10 wt% acidic water-isopropanol mixtures. Water in permeate for PILC membranes was maintained 99.5 ± 0.3 wt% (feed pH: 7–1, feed temperature: 70 °C), in stark contrast to the pristine CMCNa membrane whose separation factor declined significantly from 1791 to 91.
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
·
2022
·
IF 10.53
Mingqian Wang,Xue Cheng,Guanjin Jiang,Jiangyu Xie,Weibin Cai,Jiding Li,Yujun Wang
Polyvinyl alcohol (PVA) has been widely used in pervaporation dehydration due to its low price and good stability. However, the inherent “trade-off” effect of polymer membrane makes the pervaporation performance relatively limited. In this work, the rough and super-hydrophilic surface were constructed by biomimetic modification of silica (SiO 2 ) coating on the PVA membrane, which achieved simultaneous growth of total flux and separation factor compared with the control, and overcame the “trade-off” effect. The morphology, structure and hydrophilicity of membranes were characterized. Results demonstrated that PVA/polydopamine (PDA)/SiO 2 composite membranes had strong hydrophilicity and high surface roughness . In addition, the effects of SiO 2 loading amount, operating temperature, feed ethanol concentration and long-term stability on the ethanol dehydration performance were investigated. For the PVA/PDA/SiO 2 -6 composite membrane, total flux was 1388 g m −2 h −1 , and the separation factor was 150(69 °C,90 wt% ethanol concentration), which was 1.8 times and 1.4 times that of the pristine PVA membrane, respectively.
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
危险品化学品经营许可证（带存储）