COLLOID AND POLYMER SCIENCE
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2021
·Vol. 299
·期 9
·1459-1468
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IF 1.931
Guan Peiwen,Ren Cong,Shan Houchao,Cai Di,Zhao Peimian,Ma Dongze,Qin Peiyong,Li Shufeng,Si Zhihao
To meet the increasing requirements toward biobutanol, pervaporation membrane with high separation performance needs to be developed. In this work, a hydrophobic MAF-6 (RHO-[Zn(eim) 2 ]) was synthesized and its adsorption properties for 1-butanol was systematically studied, which are supposed to benefit the separation performance of polydimethylsiloxane (PDMS) membrane. The hydrophobic MAF-6 particles were therefore doped into PDMS to fabricate mixed matrix membrane. The morphology, chemical structure, and other properties of particles and hybrid membrane were fully studied by SEM, PXRD, FT-IR, TGA, and BET. Results demonstrate that the hydrophobicity of PDMS membrane is improved with the water contact angle increasing from 112.7° to 118.1° after being doped with MAF-6, as well as enhanced adsorption ability toward 1-butanol. More importantly, when doping MAF-6 into PDMS layer, the enhancements of 23.30% and 41.93% are separately observed in the separation factor and total flux to separate 1.5 wt% 1-butanol solution, compared with the PDMS membrane. In addition, the heat energy consumption of pervaporation process is decreased from 4.27 to 3.71 kJ g −1 via the doping of MAF-6. Overall, this work confirms that the hydrophobic particle such as MAF-6 is not only conductive to enhance the separation performance of PDMS membrane but also helpful to decrease the energy consumption.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Jialin Yang,Jierui Wang,Qi Zhang,He Zhu,Shiping Zhu
The synthesis of monolithic MOF aerogel is a critical step in applying MOFs to many practical applications. MAF-6 (RHO-[Zn(eim) 2 ], Heim = 2-ethylimidazole) is a type of MOF materials with large cavities and apertures. However, it has been much less studied due to the difficulty in obtaining it via conventional synthesis protocols. Herein, a nearly pure MAF-6 monolith with macro/meso/microporous pore structure is synthesized in situ by emulsion template method, which exhibits hierarchical structure with high porosity (∼80 %), large specific surface area (up to 1135 m 2 /g), and excellent mechanical properties. In addition, the monoliths demonstrate excellent capability and stability to separate methanol/ethanol mixtures and high catalytic performance in the Knoevenagel reaction. This work provides an effective approach to prepare MAF-6 monoliths for potential application in catalysis, adsorption, separation, etc.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Rehan Khan,Ihtisham Ul Haq,Heng Mao,Ao-Shuai Zhang,Li-Hao Xu,Hong-Gang Zhen,Zhi-Ping Zhao
Phenol is highly toxic and carcinogenic even at low concentrations. This study focused on preparing high-performance mixed matrix membranes (MMMs) for the pervaporation separation of phenol from its aqueous solution. A highly-efficient zeolitic metal azolate framework, RHO-[Zn(Heim) 2 ] (MAF-6, Heim = 2-ethylimidazole) was incorporated into the polyether block amide (PEBA-2533) supported on the polyvinylidene fluoride (PVDF) ultrafiltration membrane. The MAF-6 was chosen as the filler due to its inherent hydrophobic surfaces and aperture size (7.6 Å), which is larger than the molecular kinetic diameter of phenol (6.6 Å). Effects of the casting solution concentration, active layer thickness, MAF-6 loading, operating temperature, and phenol concentration were systematically investigated. With the increase of the MAF-6 loading ratio X from 0 to 7, the phenol flux of the membrane was gradually enhanced, but the water flux was reduced. For 1000 ppm phenol aqueous solution at 80 °C, MAF-6–7@MMM displayed the optimal separation factor of 25.9 with a phenol flux of 89.2 g∙m −2 ∙h −1 . The pervaporation separation index (PSI) of the MAF-6–7@MMM was 1317.7 kg∙µm∙m −2 ∙h −1 at 80 °C, which was much higher than the PEBA/PVDF membrane (787 kg∙µm∙m −2 ∙h −1 ). Impressively, an increasing feed temperature enhanced the phenol flux more prominently than water, owing to the hydrophobicity and porosity of MAF-6. Consequently, the resultant MAF-6-X@MMMs broke the trade-off limitation between phenol permeability and selectivity. The as-prepared membrane also exhibited exceptional long-term stability, suggesting its prospect of industrial application.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 21
·3842-3849
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IF 3.849
Chunping Gao,Qi Shi,Jinxiang Dong
The performance of two hydrophobic zeolitic imidazolate frameworks, MAF-6 and TIF-1 Zn, in adsorptive separation of 1-butanol from acetone–butanol–ethanol model fermentation broth was studied and compared to the data reported for ZIF-8. It was found that, in single-component systems, the adsorption capacities of ZIF-8 and MAF-6 were larger than that of TIF-1 Zn, mainly because of their larger pore volume; however, the time necessary to reach equilibrium was shorter when TIF-1 Zn with a larger pore aperture was used. In breakthrough experiments, it was shown that the adsorptive separation mechanism on ZIF-8 and MAF-6 was based on combined thermodynamics and kinetic effects; on TIF-1 Zn, thermodynamic adsorption took place.
研究领域:
生物工程
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化学工程
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Xiaoyue Li,Penghui Li,Yingjie Li,Haitang Liu,Zongzheng Yang,Yanyan Chen,Xiaoyuan Liao
In situ generation of H 2 O 2 by photocatalyst with sterilization is an environmentally friendly method. In this work, we prepared three kinds of Zn-based ZIFs materials, i.e., MAF-6, ZIF-11 and ZIF-71, and systematically investigated their application in the area of photocatalytic H 2 O 2 production, and antibacterial efficiency. It is found that MAF-6 had the best ability of generate H 2 O 2 (1005 μmol h -1 g -1 ), 1.6 times more than ZIF-11, while ZIF-71 produced almost no H 2 O 2 . The sterilization rate of MAF-6 against Staphylococcus aureus and Escherichia coli can reach 97% and 91% in 3 h, respectively. It is worth noting that the more photo-generated reactive oxygen species (∙OH and ∙O 2 - ) are produced, the better sterilization effect . This work provides new material and insights into photocatalytic sterilization by in situ H 2 O 2 generation.
研究领域:
环境科学
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材料科学
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微生物学
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DOI
高影响因子
DESALINATION
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2025
·
IF 9.8
Xue-Ting Zhai,Xiao-Wei Wu,Fangang Meng,Yuanyuan Zhang,Yu-Xi Huang
The nanofiltration (NF) is a promising dye/salt separation technology for dye-containing wastewater reclamation. However, the membrane permeability and selectivity trade-off is still a critical issue for the conventional thin-film composite (TFC) membranes. This study investigates the fabrication and application of MAF-6-based NF membranes for efficient dye/salt separation. MAF-6 nanoparticles were synthesized using a rapid solution mixing method and incorporated into the polyamide (PA) layer of TFC membranes. The resulting thin-film nanocomposite (TFN) membranes were analyzed for their surface morphology, physicochemical properties, and separation performance. The introduction of MAF-6 nanoparticles significantly enhanced the permeability of the membranes while maintaining high selective rejection rates for dyes over salts. Specifically, membranes with 0.1 and 0.2 wt% MAF-6 loading exhibited superior permeability and separation efficiency. The enhanced performance was attributed to reduced cross-linking degree, improved hydrophilicity, and increased surface roughness of the PA layer. Long-term stability tests over 100 h demonstrated the robustness of the MAF-6 incorporated membranes. Additionally, the study elucidated the role of MAF-6 in the interfacial polymerization process, showing that it impedes monomer diffusion and influences the surface morphology of the PA layer. These findings highlight the potential of MAF-6 in tailoring membrane properties for advanced separation applications, particularly in the treatment of complex dye wastewater.
研究领域:
环境工程
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材料科学
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膜技术
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化学工程
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水处理
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Yuanhang Jin,Yu Xie,Haipeng Zhu,Jiangpu Nan,Fenjuan Xiangli,Gongping Liu,Wanqin Jin
Separation of azeotropic mixtures is a typical energy-intensive process in chemical industry, in which pervaporation membrane process shows great potential in energy efficiency. However, the performance of commercial membranes such as polydimethylsiloxane (PDMS) is unattractive for practical application. Henein, for the first time, we employed microporous MAF-6 as a new filler incorporating into PDMS membrane for pervaporation separation of DMC/methanol azeotropic mixture. The resulting MAF-6/PDMS mixed-matrix membrane with the optimal filler size of 300 nm and filler loading of 12 wt% exhibited highly DMC permeability (651–811.5 Barrer) and selectivity (10.1–10.4) during 31 days continuous separation process, which fairly exceeds the state-of-the-arts membrane performance. A pervaporation-distillation coupled process was further proposed for the purification of DMC/methanol mixtures, showing 55.7 % of energy-saving compared with conventional distillation process.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2019
·Vol. 28
·期 3
·1668-1677
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IF 1.476
Yuan Min,Zhao Yu,Niu Wenxing,Shi Qi,Xu Hong,Zheng Bin,Dong Jinxiang
In this study, three different zeolitic imidazolate framework (ZIF) materials of ZIF-8, ZIF-71, and MAF-6 were synthesized, and their tribological properties as base grease were evaluated. We demonstrate that the tribological properties of ZIFs are correlated with the framework density/pore volume and the substituted groups. Under 200 N, MAF-6 has the lowest wear volume value and ZIF-71 exhibits the lowest friction coefficient. As the load increased, MAF-6 maintained the best and most stable tribological performances among the three ZIFs additives; however, the properties of ZIF-71 worsened. Thus, MAF-6 exhibits the lowest density and largest solvent-accessible volume (SAV) and has the lowest elastic stiffness; it easily slides and adheres onto the wear surface, forming a tribofilm that reduces friction and prevents severe wear. ZIF-71 with chlorinated groups may enhance the tribological performance; as the load rises, its dense and stiff structure has an adverse effect. These results are expected to be helpful for designing future ZIFs with excellent lubrication properties.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
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