CARBON
·
2026
·
IF 12.7
Wenxuan Du,Dong Wei,Yuelei Gu,Yufeng Liu,Shaotong Liang,Minghan Li,Xing Lin,Chengzhen Sun
Pervaporation (PV) demonstrates immense potential in seawater desalination due to its high salt rejection rate and energy efficiency, even for high-salinity desalination. Graphene oxide (GO) membranes are regarded as a highly promising class of membranes for pervaporation, but currently hindered by their tendency to swell in aqueous environments and the high vacuum degrees typically required, which compromise stability and increase energy consumption. In this study, a composite membrane fabrication strategy was developed by crosslinking GO with thiourea (TU) and modifying it with graphitic carbon nitride (g-C 3 N 4 ). The TU cross-linking is designed to rigidify the laminar structure and restrict swelling under high-salinity conditions, while the porous g-C 3 N 4 nanosheets serve as spacers to potentially introduce favorable water transport pathways, thereby reducing transport tortuosity and lowering the apparent critical vacuum degree and energy consumption for salt-water treatment. Under optimal operating conditions (temperature: 70 °C, flow rate: 75 mL min −1 , vacuum: 96 kPa), the GO–TU–g-C 3 N 4 membrane achieved a water flux of 49.18 L m −2 h −1 and an ion rejection rate of 99.95% for 3.5 wt% NaCl solution. Even under high-salinity conditions, it exhibits superior performance in terms of quantitative metrics. Under 20 wt% salinity, the GO–TU–g-C 3 N 4 membrane achieved a water flux of 25.04 L m −2 h −1 and an ion rejection rate of 99.97%. The developed GO-TU-g-C 3 N 4 membrane demonstrates superior pervaporation performance, showing competitive water flux and ion rejection compared with representative state-of-the-art membranes reported in the literature. This work offers a robust and energy-efficient approach for low-vacuum pervaporation desalination of both seawater and highly concentrated brines. Download: Download high-res image (303KB) Download: Download full-size image
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高影响因子
Foods
·
2022
·Vol. 11
·期 17
·2598
·
IF 5.561
Xiaoqin Wang,Wentao Guo,Baoguo Sun,Hehe Li,Fuping Zheng,Jinchen Li,Nan Meng
As a deep-processed product of peach, the aroma characteristics of peach spirit have not been systematically studied, and there has been no research on improving the aroma quality through process improvement. Pervaporation technology was used for the first time in the production of peach spirit instead of distillation, and its critical aroma compounds were analyzed compared with distilled peach spirit. Compared to the distilled peach spirit, pervaporation produced peach spirit presented stronger fruity, honey, and acidic aromas, and lighter cooked-apple aroma. Sixty-two and 65 aroma-active regions were identified in the distilled and pervaporation produced peach spirits, and 40 and 43 of them were quantified. The concentrations of esters, lactones, and acids were significantly higher in the pervaporation produced peach spirit than those in the distilled peach spirit, while terpenoids showed opposite tendency. Both of the overall aromas of distilled and pervaporation produced peach spirits were reconstituted successfully by the compounds with OAV ≥ 1. The omission tests identified 10 and 18 compounds as important aroma compounds for distilled and pervaporation-produced peach spirits, respectively. The differences in the key aroma compounds between the two types of peach spirits explained the differences in the aroma profiles.Keywords:peach spirit;distillation;pervaporation;aroma;sensomics approach
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Heng Mao,Shen-Hui Li,Ao-Shuai Zhang,Li-Hao Xu,Heng-Xing Lu,Jing Lv,Zhi-Ping Zhao
Furfural is a typical biomass-derived platform chemical. Conventional processes for furfural production are uneconomical and energy-intensive because only about 3–6 wt% of furfural in the hydrolysate needs to be separated. In this study, a series of mixed matrix membranes (MMMs) were prepared by incorporating MIL-53(Al) particles (MAPs) into poly (ether-block-amide) (PEBA 2533) matrix for pervaporation separation of furfural from aqueous solutions. The MAPs with anisotropic morphology and tunable particle size were precisely synthesized by a high-efficiency solvent-controlled microwave synthetic strategy. Effects of MAPs on the microstructures, physicochemical properties of MAPs/PEBA MMMs were investigated in detail through SEM, EDS, XRD, FTIR, TGA, N 2 adsorption and contact angle measurements. The experimental results suggested that compared with the PEBA control membrane, the addition of MAPs notably reduced the permeation energy barrier for furfural, but not for water. The coin-like MAPs-16.7 filled MMMs presented the optimal separation performance, which exceeded other furfural-permselective membranes. Impressively, a high total flux of 3800 g∙m −2 ∙h −1 and an adequate furfural/water separation factor of 50.2 was achieved in PV separation of 1 wt% furfural aqueous solution at 80 °C, which could substantially reduce capital investment and equipment footprint. Furthermore, a continuous testing was operated for 200 h in ternary furfural/acetic acid/water simulated hydrolysate, highlighting the long-term membrane stability in realistic applications. High performance and long-term stability made MAPs/PEBA MMMs potential candidates for industrial furfural production.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Jia Peng,Hongdan Wu,Rongxue Li,Xianyuan Fan,Zhihui Zhou,Ke Zhang
1,2-bis(triethoxysilyl)methane (BTESM) is a bridged-type organoalkoxysilane, which was utilized for organic–inorganic membranes preparation via a sol–gel method to achieve high permselectivity, thus are promising for dehydration and purification of organic solvents. However, the particle size of the derived sol is crucial for membrane preparation during sol–gel processing, significantly influencing the membrane’s performance. Herein, we reported a novel strategy of controlling the sol particle size by adjusting the pH during the preparation process. BTESM-derived membranes were prepared by BTESM-H + sol and BTESM-swing sol, which were subsequently employed for the dehydration of isopropanol (IPA) through pervaporation (PV). Compared with the BTESM-H + sol, the particle size of the BTESM-swing sol prepared by the pH-swing method was increased from 1.3 nm to 32.7 nm. The larger particle size could hinder the permeation into the intermediate layer. Meanwhile, the dense arrangement of silica particles could efficiently retain IPA molecules, thereby substantially enhancing the rejection rate of IPA. The average particle size of the BTESM-swing sol was 18.7 nm at an acid-base ratio of 1.2 and acid-silicon ratio of 0.55, resulting a permeate flux of 1.04 kg·m −2 ·h −1 and separation factor of 521, while IPA rejection rate was 97.84 %. This work has shown that adjusting the pH during the process is a useful strategy of controlling the sol size for the preparation of organic–inorganic membranes. Hence, the control of sol particle size to achieve a high-performing membrane layer offers a novel approach to producing diverse membrane materials.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yun Xiong,Niyan Deng,Xiaoyu Wu,Quan Zhang,Shengpeng Liu,Guofeng Sun
The incorporation of attainable amine functionality in zeolitic imidazolate framework-8 (ZIF-8) is utilized to enhance the pervaporation performance for ethanol/ water separation applications. Using 2-aminobenzimidazole, a ligand with NH 2 -functionalized group, displacement of the ZIF-8 original ligand during de novo synthesis while preserving the ZIF-8 initial structure, which produces a novel mixed- linker ZIF material (ZIF-8-NH 2 ) with smaller nanocrystal size, controllable pore size, and enhanced hydrophilicity. A series of different mixed matrix membranes (MMMs) were fabricated by incorporating ZIF-8-NH 2 into poly(vinyl alcohol) (PVA) matrix. Various characterization techniques, such as FTIR, 1 H NMR, XRD, SEM, TGA, and Contact angle etc. were employed to demonstrate the properties of prepared ZIF nanoparticles and the MMMs. The results indicated that ZIF-8-NH 2 and the MMMs were perfectly fabricated, which were attributed to better dispersion and compatibility between them. In particular, 7-ZIF-8-NH 2 /PVA MMM exhibited a comparable total flux of 142 g/m 2 ·h and water/ethanol separation factor of 925, which were increased by 73 and 524%, on the basis of the pristine PVA membrane. In addition, different nanofillers, APTES crosslinking, ZIF-8-NH 2 loading, operating temperature, feed concentration, and membrane stability were evaluated in detail. This study might provide a promising prospect for designing MOF-based MMMs with the introduction of various functional groups.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Rehan Khan,Wei-Min Liu,Ihtisham Ul Haq,Hong-Gang Zhen,Heng Mao,Zhi-Ping Zhao
Pyridine is generally found in the effluents from the synthesis of paints, rubber chemicals, vitamins, and pesticides. This study focused on improving the pervaporation (PV) performance of polyether block-amide (PEBA-2533) membranes cast on polyvinylidene fluoride (PVDF) substrate, by incorporating the MIL-53 (Al) particles to prepare mixed matrix membranes (MMMs) for pyridine separation from the aqueous solution. MIL-53 (Al) has a larger aperture size (8.5 Å) than the molecular size of the pyridine (6.0 Å), which could allow pyridine molecules to efficiently pass through its channels. The coadjacent MIL-53 particles created relatively continuous permeation pathways for the penetrants in the MMMs, which substantially enhanced the separation performance. Impressively, the resultant MMMs displayed superior pyridine separation performance at complex conditions. At 65 °C and 0.5 wt% pyridine aqueous solution, the separation factor and pyridine flux of PEBA/PVDF membrane were 17.3 and 143.5 g m −2 h −1 , which were improved using MIL-53@PEBA/PVDF MMMs to 48.1 and 226.9 g m −2 h −1 , respectively. Owing to the enhanced pyridine affinity, hydrophobic property, and thermal robustness, the resultant MMMs overcame the inherent trade-off between selectivity and permeability, and also displayed the promising long-term stability. These findings may provide valuable insights for developing novel MMMs with superior separation performance.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 18
·4465
·
IF 4.2
Yun Xiong,Yifan Shu,Niyan Deng,Xiaogang Luo,Shengpeng Liu,Xiaoyu Wu
This study investigated the enhancement in bioethanol recovery from mixed matrix membranes (MMMs) by functionalizing zeolite framework-8 (ZIF-8) with imidazolate. This study focused on the separation of ethanol from low-concentration ethanol/water mixtures (typical post-fermentation concentrations of 5–10 wt%). Specifically, ZIF-8 was modified by the shell–ligand exchange reaction (SLER) with 5,6-dimethylbenzimidazole (DMBIM), resulting in ZIF-8-DMBIM particles with improved hydrophobicity, organophilicity, larger size, and adjustable pore size. These particles were incorporated into a PEBAX 2533 matrix to produce ZIF-8-DMBIM/PEBAX MMMs using a dilution blending method. The resulting membranes showed significant performance enhancement: 8 wt% ZIF-8-DMBIM loading achieved a total flux of 308 g/m2·h and a separation factor of 16.03, which was a 36.8% increase in flux and 176.4% increase in separation factor compared with the original PEBAX membrane. In addition, performance remained stable during a 130 h cycling test. These improvements are attributed to the enhanced compatibility and dispersion of ZIF-8-DMBIM in the PEBAX matrix. In conclusion, the evaluation of nanofiller content, feed concentration, operating temperature, and membrane stability confirmed that ZIF-8-DMBIM/PEBAX MMM is ideal for ethanol recovery in primary bioethanol concentration processes.
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高影响因子
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