FUEL
·
2025
·
IF 7.5
Xiaowei Wu,Yuqin Li,Zhengquan Yang,Mingyu Peng,Tian Gui,Xiangshu Chen,Hidetoshi Kita
A beta zeolite membrane reactor was first applied to improve conversion on the esterification of oleic acid and n-butanol at low temperature by rapidly removing the by-product water. In the pervaporation (PV)-esterification at low temperature of 353 K, the final conversion of oleic acid was significantly improved to 99.2 % in a short reaction time of 4 h. Even at an incredibly low esterification temperature of 333 K, the conversion of oleic acid reached 95.7 % in 4 h. Besides, the beta zeolite membrane reactor exhibited good hydrothermal and acid stabilities with a high oleic acid conversion (maintained above 99 %) after 5 reaction cycles. Through XRD and SEM characterization, it was found that the membrane kept complete crystal structure. Process intensification through a beta zeolite membrane reactor aided by PV was successfully used to enhance the esterification at low temperature in a short time, which was a promising coupling technology.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Yahui Xuan,Xiaofang Feng,Shuning Liu,Xiaobo Liu
The difficulty of recycling and the finite photocatalytic performance of primitive nano-photocatalysts restrict their application in wastewater purification. In this study, a multifunctional membrane with efficient synergistic adsorption and degradation performance was constructed. The nano-photocatalyst layered bimetallic oxide (LDO) was combined with the matrix membrane polyarylether nitrile (PEN) by delayed phase transition technology. The introduced 2-Methylimidazole (2-MeIm) provided a virtual electron transfer pathway between PEN and LDO and enhanced the photocatalytic performance. The results suggested that PEN/LDO/2-MeIm has outstanding removal performance to organic dyes methylene blue (MB). After three consecutive cycles, the reacted membrane can be readily recovered from the system. The MB removal rate remained high at 89.38%, suggesting that the functional membrane is eligible for recycling and reuse. Finally, based on liquid chromatography-mass spectrometry (LC-MS) analysis and density functional theory (DFT) calculations, the mechanism and pathway of MB photodegradation by the PEN/LDO/2-MeIm system were proposed. Therefore, constructing PEN/LDO/2-MeIm membranes in this study may offer a novel perspective on creating eco-friendly and functional PEN-based membranes for practical use in wastewater purification.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Junbin Liao,Qishun Zhang,Yu Xu,Shiyu Zhou,Yifan Xu,Wenlong Ding,Zhiqiang Wu,Haoyu Liu,Yanqing Xu,Huimin Ruan,Jiangnan Shen
The ion separation performance of polymer membrane can be significantly enhanced by constructing suitable and stable ion channels within the dense matrix. In this work, we fabricated four anion exchange membranes (AEMs) based on a type of distorted poly(aryl ether sulfone) bearing dual-side-chains and explored the influence of these dual-side-chains by tuning the ratio of the two on the separation performance of Cl−/F− and Cl−/SO42−. Small-angle X-ray scattering analysis indicated that the as-prepared AEMs in wet state possessed sub-nanometer ion channels with a size of 0.334 nm, which resulted from the synergetic modification of the distorted main chains and dual-side-chains. In addition, the stability of the ion channels could be verified by a very low swelling ratio of 5.3%. The AEM with the smallest ion channel demonstrated superior perm-selectivity (Cl−/SO42−) of 52.21 during the electrodialysis (ED) process, compared to other AEMs, such as ACS AEM, which showed a selectivity of 18.63. In addition, the optimum AEM (PPH-sIm10−X-5NX) also exhibited selectivity for Cl−/F− due to its dense structure and hydrophobic side chains. By using free volume and electrostatics-driven simulations, it was inferred that the ion-blocking effect of the dense membrane structure on the transport of larger ions was effective. As a result, this dual-side-chain polymer with a distorted backbone is conducive to constructing stable sub-nanometer ion channels in AEMs for mono-/bi-valent anion resource recovery.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Min An,Chengxiang Wang,Qing Liu,Mengya Wang,Zhirong Yang,Wenpeng Li,Guoli Zhou,Jingtao Wang,Jinli Zhang
Combining the advantages of high efficiency, low-pressure drop, and large throughput, the pore array-enhanced tube-in-tube microchannel (PA-TMC) is a promising microreactor for industrial applications. However, most of the mass transfer takes place in the upstream pore region, while the contribution of the downstream annulus is limited. In this work, helical wires were introduced into the annulus by adhering to the outer surface of the inner tube. Mixing behavior and mass transfer of liquid–liquid two-phase flow in PA-TMC with different helical wires have been systematically studied by a combination of experiments and volume of fluid (VOF) method. The introduction of helical wires improves the overall volumetric mass transfer coefficient K L a by up to 133% and the mass transfer efficiency E by up to 117%. The simulation results show that the helical wire brings extra phase mixing regions and increases the specific interface area, while accelerating the fluid flow and expanding the area of enhanced turbulent dissipation rate. Influences of helical wires in various configurations are compared by the comprehensive index I concerning the pressure drop and mass transfer performance simultaneously and a new correlation between K L a and specific energy consumption ϕ is proposed. This research deepens the understanding of the mixing behavior and mass transfer in the PA-TMCs and provides practical experience for the process intensification of microchannel reactors.
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JOURNAL OF MEMBRANE SCIENCE
·
2017
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IF 6.035
Kuibo Zhang,Shoutao Gong,Baolin Zhao,Yanxiang Liu,Naeem Akhtar Qaisrani,Lingdong Li,Fengxiang Zhang,Gaohong He
Inadequate hydroxide conductivity of anion exchange membrane (AEM) is one of the obstacles restricting practical application of anion exchange membrane fuel cell. In this work, we report the design, fabrication and properties of AEMs based on bent-twisted non-coplanar block copolymer . The bent-twisted polymer backbone creates high free volume size so that hydroxide ion transport is facilitated. The free-volume effect can also facilitate microphase separation due to enhanced chain segment motion. With the free-volume holes working synergistically with microphase-separation enabled ion channels, the membrane showed a high conductivity (35 mS cm −1 at room temperature) at a relatively low ion exchange capacity (IEC, 1.25 meq g −1 ); it also exhibited a good dimension stability, the swelling ratio being 4.7% at room temperature and kept virtually unchanged with temperature because of relatively low IEC. A H 2 /O 2 fuel cell employing the fabricated AEM yielded a high power density (262 mW cm −2 at 50 °C). Our work opens up a new route to fabrication of highly conductive AEM with relatively low IEC.
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POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 5
·598-605
·
IF 2.352
Yongmei Tang,Lan Li,Kai Ma,Guofei Chen,Wei Wang,Xingzhong Fang
Two series of cardo polyimides were prepared from 1,4-bis(4-fluorophthalimide)cyclohexane with different trans / cis ratios and phenolphthalein/ o -cresolphthalein via aromatic nucleophilic substitution reaction. The inherent viscosities of the synthesized polymers were found to be 0.55–0.66 dL g −1 in N , N ′-dimethylacetamide. The cardo polyimides showed excellent solubility in organic solvents, high glass transition temperatures ( T g ) of 275–312 °C and moderate thermal stability with 5% weight loss temperatures ( T d5% ) of 415–441 °C in nitrogen and 370–436 °C in air. The polyimide films exhibited high optical transparency with cut-off wavelengths of 350–355 nm and moderate mechanical properties. The different properties of the polymers caused by trans and cis configurations of 1,4-diaminocyclohexane were also investigated. It was found that with an increasing content of trans configuration of 1,4-diaminocyclohexane in the polyimide backbone, T g of the polyimides increased as well as T d5% , while the solubility gradually decreased. The polyimide films had good optical transparency regardless of trans / cis configuration. © 2018 Society of Chemical Industry
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Journal of Coatings Technology and Research
·
2024
·
IF 2.3
Wang Peizhuang,Zhang Li,Hu Zhiqing,Shang Jiaqi,Zhou Jiang
Chitin nanofibers (ChNFs) with different numbers of carboxyls (i.e., with different degree of substitute, DS) were prepared by adjusting the amount of maleic anhydride used in the acylation treatment prior to mechanical nanofibrillation with ultrasound. Transparent coatings were fabricated by using the obtained ChNFs through casting method and modified via vapor deposition by using 1 H , 1 H , 2 H , 2 H -perfluorodecyltrichlorosilane (PFDTS). Hydro-oleophobicity and anti-fingerprint capacity of the ChNF coatings were studied. It was found that the ChNF coatings with more carboxyls possessed stronger hydro-oleophobicity as well as anti-fingerprint capacity after the modification of PFDTS deposition. Analysis of X-ray photoelectron spectroscopy suggested that more PFDTS molecules were grafted onto the ChNF coating surface when the ChNFs had more carboxyls (with higher DS). It is the number of carboxyls rather than hydroxyls on ChNF coating surface that determines hydro-oleophobicity and anti-fingerprint capacity of the ChNF coating surface after the modification of the PFDTS deposition. Graphical abstract
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2025
·Vol. 26
·期 3
·1236
·
IF 4.9
Zhiguo Zhang,Buyu Liu,Wei Liu,Xingquan Liu,Chengcheng Zhang,Weiwei Hu,Weicheng Wu
Different dietary fibers have distinct structures, leading to significant variations in their laxative effects. To explore how these structural differences impact constipation intervention, a 14-day study was conducted on loperamide-induced constipated mice using five dietary fibers: soluble dietary fiber from steamed sweet potato (SDF-S), oat β-glucan (OB), polydextrose (PD), arabinogalactan (AG), and inulin (IN). The results showed that four fibers, excluding PD, significantly improved gastrointestinal (GI) transit rate (p< 0.05), although PD had the highest fecal moisture, it was significantly different from the lowest IN (p< 0.05). AG and IN resulted in higher 6 h fecal weights compared to other fibers. SDF-S and OB were more effective in modulating serum levels of gastrointestinal hormones. The different monosaccharide compositions and glycosidic bonds of these fibers led to distinct changes in gut microbiota composition and SCFA profiles. Galactose and arabinose in AG were linked to increased abundance ofLachnospiraceae_UCG-006,Bacteroides, andOdoribacter, promoting butyrate fermentation, which is positively correlated with GI transit rate. Glucose in SDF-S, OB, and PD favored acetate fermentation positively correlated with fecal moisture. Fructose in IN encouraged the proliferation ofMuribaculaceae_unclassifiedandRuminococcus, associated with butyrate fermentation and increased 6 h stool weight, respectively. The β-glycosidic bonds in OB may lead to high butyrate production through the selective proliferation ofLachnospiraceae_unclassified. Minor components like fucose, rhamnose, and ribose were positively correlated with the abundance ofOscillospiraceae_unclassified,Anaerotignum, andLachnospiraceae_unclassified. In conclusion, the unique monosaccharide compositions and glycosidic bond differences in dietary fibers selectively promote the proliferation of fiber-degrading and butyrate-producing bacteria, resulting in varied effects on constipation relief.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Zhengping Ding,Jing Li,Yanqing Huang,Huahui Lin,Peng Wei,Jianbin Li,Xiangqun Zhuge,Zhenzhong Yang,Ke Qu,Yurong Ren
The burgeoning use of lithium-ion batteries (LIBs) creates a growing challenge: spent battery management. Traditional hydrometallurgical recycling with coprecipitation generates massive Na2SO4 wastewater, posing a significant environmental burden. This work presents a novel, closed-loop recycling method for LIB cathode materials that merges electrolysis and hydrometallurgy. Using Na2SO4 electrolysis, we produced high-purity sulfuric acid and sodium hydroxide solutions, which served as the key reagents for leaching and resynthesizing waste cathodes. Optimized leaching conditions ensure near-complete recovery of valuable metals. Li2CO3 and a precursor (Ni0.8Co0.1Mn0.1(OH)2) are subsequently precipitated and regenerated into a new LiNi0.8Co0.1Mn0.1O2 cathode material, which demonstrates excellent electrochemical performance. The spent Na2SO4 solution undergoes a simple treatment before re-electrolysis, achieving a closed-loop system with minimal waste generation and reduced reliance on external reagents. Moreover, the acid-leaching carbon residue is repurposed as a bifunctional carbon-based catalyst for hydrogen peroxide production. This innovative approach offers both economic and environmental benefits, paving the way for sustainable LIBs recycling and a circular economy for battery materials.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Chenxi Han,Youquan Li,Yibing Chen,Jin Zhang,Zijun Zhang,Yuqiu Ke,Jun Xiong,Linghui Yu,Ming Li
Interfacial solar desalination generation (ISDG) presents a promising solution for obtaining freshwater from seawater. However, developing solar evaporators with robust salt resistance using simple methods to ensure consistent desalination performance remains a major challenge. In this study, we engineered a solar evaporator (CuS-PDA-PVAF) by modifying polyvinyl alcohol foam (PVAF) with polydopamine (PDA) and CuS using a straightforward solution immersion method. The incorporation of PDA and CuS enhances the sunlight absorption capability of PVAF to approximately 98 %, resulting in an evaporation rate of 1.44 kg m –2 h –1 under 1-solar intensity. The CuS-PDA-PVAF solar evaporator leverages the macroporous structure and excellent hydrophilicity, enabling it to withstand 15 wt% saltwater while maintaining a steady evaporation rate of about 1.17 kg m –2 h –1 . Outdoor tests confirm that a 1 m 2 CuS-PDA-PVAF can generate approximately 5.6 kg of freshwater daily. This solar evaporator, designed simply and resistant to salt, possesses substantial potential for alleviating freshwater scarcity.
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POLYMER COMPOSITES
·
2025
·
IF 4.7
Jiaoli Hu,Dong Li,Yanjin Dang,Fan Zhang,Huifang Chen,Minglei Wang,Anqi Ju
The increasing demand for carbon fiber/polyether-ether-ketone (CF/PEEK) composites in marine and aerospace engineering is driven by their potential for weight reduction and enhanced structural flexibility. However, the inherent weak interface poses a challenge, leading to stress concentration and structural failures. Herein, aqueous PEKC-COOH sizing agent on CF as a soft unit (SCF) and hydroxyapatite (HA) nanomaterial as a rigid unit establish a regulable active interface structure, synergistically enhancing the interface adhesion through mechanical interlocking and chemical bonding of the CF/PEEK composites. Under external loading, the PEKC-COOH sizing agent allows for uncurling of molecular chains at the interface, promoting slip of HA nanomaterials and dissipating a significant amount of energy during fracture progression. The SCF-HA/PEEK composites exhibited significant enhancements in interlaminar shear strength and flexural strength, with an increase of 65.1% and 49.8%, respectively, compared with the pristine composites. Meanwhile, the salt-spray resistance of the composites has been significantly improved. Following a 72-h salt spray test, the ILSS retention ratios of modified SCF-GB/PEEK composites were determined to be 91.7%. Remarkably, the use of cationic, non-ionic, and zwitterionic surfactants reduced the growth time of HA on the fiber surface in simulated body fluids to 15 min compared to several days using conventional methods. This study not only improves production efficiency and reduces manufacturing costs but also provides a research foundation for industrial manufacturing. Furthermore, the novel interface structure design broadens the applicability of CF/PEEK composites in hygrothermal and salt-spray environments. Highlights Regulable interface was formed by in situ growth of HA on fiber sizing agent. HA nanomaterial growth time in SBF was reduced from several days to 15 min. Modified composites increase ILSS by 65.1% and flexural strength by 49.8%. Modified composites maintain 91.7% ILSS after a 72-h salt-spray resistance test.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Xinyue Yao,Yan Xu,Dahua Zhu,Zijun Zhang,Chengqi Feng,Jin Zhu,Chao Fang
A bio-based high-grafting-rate compatibilizer, itaconic anhydride grafted polypropylene (ITA-g-PP), was successfully prepared using 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (L101) as the initiator and assisting by the radical trapping agent α-methyl styrene (AMS). Itaconic anhydride (ITA) was synthetically grafted onto polypropylene (PP) through a dynamic reactive extrusion. The influences of variant contents of ITA and L101 on the grafting reaction were systematically investigated using infrared spectroscopy (IR), acid-base titration, melt flow index, contact angle, differential scanning calorimetry (DSC), mechanical properties and rheological testing methods. The mechanical performances and microstructure of the wheat fiber (WF) enhanced PP composites were investigated. In addition, a series of comparisons were made between ITA-g-PP and self-made maleic anhydride grafted polypropylene (MAH-g-PP) under the same conditions. The results show that the highest grafting rate of ITA-g-PP reached 1.45 %, greatly improving the hydrophilicity of PP. Under the same conditions, ITA-g-PP grafting rate can reach 1.2 %, and self-made MAH-g-PP grafted rate was only 0.75 %. The prepared ITA-g-PP can significantly enhance the adhesion of interfacial between WF and PP compared with traditional MAH grafted PP, thereby improving impact and tensile properties. Among them, adding ITA-g-PP to WF/PP composites can increase the impact strength by up to 29 %, while adding MAH-g-PP can only increase it by 17 % in WF/PP composites.
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