JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Ke Chen,Xin Guo,Linhan Ni,Junwen Qi,Jiansheng Li
Rational design and construction of fillers and polymers are crucial for the development of high-performance mixed matrix membranes (MMMs). In this work, amino-functionalized metal-organic frameworks KAUST-7 (KAUST-7-NH 2 ) with square-shaped sheet morphology were utilized as fillers to fabricate MMMs by physical blending with the polymer of intrinsic microporosity (PIM-1). The square-shaped KAUST-7-NH 2 sheets, prepared via in situ replacement of 2-aminopyrazine into the KAUST-7 framework, exhibited superior separation performance compared to the mono-ligand KAUST-7. Benefiting from the strong CO 2 affinity, high porosity and optimal pore sizes of KAUST-7-NH 2 , the outstanding CO 2 /CH 4 separation performance of the composite membrane was observed. The integration of square-shaped KAUST-7-NH 2 sheets provides a 2.5-fold improvement in CO 2 /CH 4 selectivity together with acceptable gas permeability as compared to the original PIM-1 membrane. Furthermore, a 100-h continuous permeation test validated the stability of the fabricated MMMs. Remarkably, the resulting MMM retained 92% of their initial CO 2 permeability after 150 days (drop of only 249 Barrer), indicating that the reduction in CO 2 permeability was approximately 10-fold lower than that of the pristine PIM-1 membrane. The prepared MMMs exhibit enhanced CO 2 /CH 4 selectivity and long-term stability, making it a highly promising candidate for practical application.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Membranes
·
2022
·Vol. 12
·期 8
·786
·
IF 4.562
Xingqian Wang,Yuping Zhang,Xinwei Chen,Yifei Wang,Mingliang He,Yongjiang Shan,Yuqin Li,Fei Zhang,Xiangshu Chen,Hidetoshi Kita
Fillers play a critical role in the performance of mixed matrix membranes (MMMs). Microporous metal azolate frameworks (MAFs) are a subclass material of metal–organic frameworks (MOFs). Due to the uncoordinated nitrogen of the organic ligands, MAF-7 (SOD-[Zn(mtz)2], Hmtz = 3-methyl-1,2,4-triazole, window: d = 0.34 nm) shows excellent CO2adsorption performance. In this work, Pebax 1657/MAF-7 MMMs were prepared by a sample solution casting method with MAF-7 particles as fillers for the first time. By means of X-ray diffraction (XRD), scanning electron microscope (SEM), infrared radiation (IR), and thermogravimetry (TG), the compositional and structural properties of the mixed matrix membrane with different filler content were analyzed. The results show that the compatibility of MAF-7 and Pebax is good with a filler content of 5 wt.%. The pure gas testing showed that mixed matrix membrane has a high ideal CO2/N2selectivity of 124.84 together with a better CO2permeability of 76.15 Barrer with the optimized filler content of 5 wt.%. The obtained membrane showed 323.04% enhancement in selectivity of CO2/N2and 27.74% increase in the permeability of CO2compared to the pristine membrane at 25 °C and 3 bar. The excellent separation performance may be due to the ligands that can afford a Lewis base active site for CO2binding with the uniform dispersion of MAF-7 particles in Pebax and the favorable interface compatibility. The obtained membrane overcomes the Robeson’s upper bound in 2008 for CO2/N2separation. This work provides a new strategy by utilizing MAFs as fillers with triazole ligand to enhance the gas separation performance of mixed matrix membranes.
研究领域:
材料科学
·
气体分离
·
膜技术
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DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Jie Liu,Kai Sun,Rui Zhu,Xun Wang,Michael Gatheru Waigi,Shunyao Li
Bisphenol A (BPA) is a ubiquitous endocrine disruptor that poses adverse human health risks. Herein, biotransformation kinetics, products, and mechanisms of BPA undergoing a laccase-producing Trametes hirsuta La-7 metabolism were for the first time reported. Strain La-7 could completely biotransform ≤0.5 mmol·L −1 BPA within 6 d in vivo . Notably, its extracellular crude laccase solution (ECLS) and intracellular homogenized mycelium (HM) only required 6 h to convert 85.71% and 84.24% of 0.5 mmol·L −1 BPA in vitro , respectively. The removal of BPA was noticeably hampered by adding a cytochrome P-450 inhibitor (piperonyl butoxide) in HM, disclosing that cytochrome P-450 monooxygenase participated in BPA oxidation and metabolism. BPA intermediates were elaborately identified by high-resolution mass spectrometry (HRMS) combined with 13 C stable isotope ratios (BPA: 13 C 12 -BPA = 0.25: 0.25, molar concentration). Based on the accurate molecular mass, isotope labeling difference, and relative intensity ratio of product peaks, 6 versatile metabolic mechanisms of BPA, including polymerization, hydroxylation, dehydration, bond cleavage, dehydrogenation , and carboxylation in vivo and in vitro , were confirmed. Germination index values revealed that inoculating strain La-7 in a BPA-contaminated medium presented no phytotoxicity to the germinated radish ( Raphanus sativus L.) seeds. In vivo , Mg 2+ , Fe 2+ , Fe 3+ , and Mn 2+ were conducive to BPA removal, but Cd 2+ and Hg 2+ significantly obstructed BPA elimination. Additionally, strain La-7 also exhibited high-efficiency metabolic ability toward estrone (E1), 17 β -estradiol (E2), and 17 α -ethinylestradiol (EE2), with more than 96.13%, 96.65%, and 100% of E1, E2, and EE2 having been converted, respectively. Our findings provide an environmentally powerful laccase-producing fungus to decontaminate endocrine disruptor-contaminated water matrices by radical polymerization and oxidative decomposition.
研究领域:
环境科学
·
微生物学
·
毒理学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2025
·Vol. 18
·期 1
·151
·
IF 3.2
Jiaxing Cai,Yunye Cao,Bingfei Yang,Jiajie Li,Michael Hitch
This study presents a novel Fe3O4/C composite material synthesized from red mud through a process of magnetic roasting and separation. The research explores the impact of Fe3O4/C dosages, sodium persulfate (PS) concentrations, and initial solution pH on the chemical oxygen demand (COD) removal efficiency using Acid Orange 7 as a model pollutant. Optimal conditions were identified as 3 g/L Fe3O4/C, 20 mM PS, and an initial pH of 2, achieving a 94.11% COD removal efficiency within 30 min. X-ray diffraction and photoelectron spectroscopy analyses confirmed that the magnetization roasting process effectively transformed red mud’s ferric oxide (Fe2O3) into magnetite (Fe3O4). Concurrently, Fe3O4interacted with residual carbon to form the Fe3O4/C composite. This composite demonstrated superior catalytic performance, along with excellent recyclability and reusability.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
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2021
·
IF 3.599
Cheng Zhang,Xihao Pan,Hanyu Deng,Siyao Cheng,Aming Xie,Wei Dong
The frequent use of explosives puts enormous pressure on the environment and poses a potential threat to human health. Fluorescent probes , which can detect explosives quickly and accurately, have attracted increasing attention of researchers, but there are few reports about the detection of various novel explosives. In this work, a novel probe CST was synthesized through Cholesterol succinate and tetraphenylethylene derivative. Fluorescence spectra showed that CST had a typical aggregation-induced emission (AIE) effect in THF/H 2 O solution, and explosive FOX-7 could effectively quench this fluorescence without being affected by other explosives or ions, with the quenching constant of 0.799 × 10 5 M −1 . The filter paper and cotton rods prepared with the probe could detect FOX-7 specifically, which also provided the possibility for practical application on the battlefield.
研究领域:
化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2023
·
IF 4.3
Shijie Wei,Hongcen Zheng,Jia-Jia Zhao,Shouyun Yu,Bingdang Wu,Guoyang Zhang,Shujuan Zhang
Self-sensitized degradation is a typical fate of azo dyes in aquatic systems but its kinetics is far too slow to meet the requirement for a thorough decolorization. Small diketones were found being able to enhance the degradation of dyes under UV irradiation and the introduction of an electron-denoting group at the α -position of the simplest β -diketone (acetylacetone, AA) had a further enhancement effect on the degradation. However, it is unclear whether such enhancement effects exist in the solar-irradiated systems. To clarify this question, the effects of three AA derivatives were investigated with Acid Orange 7 (AO7) as a representative azo dye. Compared with the AA derivatives with a methyl or an ethyl group at the central carbon (AA-CH 3 and AA-CH 2 CH 3 ), 3,5-diacetylheptane-2,6-dione (AA-CH 2 -AA, which is a condensed combination of AA and AA-CH 3 ) showed a >2-fold stronger enhancement effect. The nonstoichiometric enhancement effect of AA-CH 2 -AA on AO7 photodegradation disclosed a novel pathway for dye degradation: AA-CH 2 -AA could enhance the degradation of AO7 by reacting with the photo-sensitized 1 O 2 , whereas AA led to an inhibitory effect on the self-sensitized degradation of AO7 by quenching the excited state of the azo dye. These results demonstrate that small diketones could be designed to regulate the photodegradation of azo dyes in multiple pathways.
研究领域:
环境化学
·
光化学
·
水处理
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产品关联
DOI
高影响因子
Symmetry-Basel
·
2025
·Vol. 17
·期 2
·224
·
IF 2.2
Yaohui Xu,Yong Li,Liangjuan Gao,Zhao Ding
CeO2has a potential application in the purification of organic dye wastewater because of the abundant oxygen vacancy (VO) defects in its crystals. In this study, a cubic CeO2microsphere with layered interleaved symmetrical 3D flower-like morphology was synthesized, and its adsorption capacity for acid orange 7 (AO7) was further enhanced by Y doping. The impact of varying amounts of Y ions on the phase composition, lattice parameters, and morphology of the product was investigated, revealing that 4 mol.% was determined as the doping level limit of Y ions in CeO2crystals. XPS, Raman, and H2−TPR techniques were employed to compare surface species changes before and after 4 mol.% Y doping in the CeO2crystals, including O−Ce(III), O−Ce(IV), O−Y(III), and VOcorrelation, yielding a rough quantitative assessment of these species. The 4 mol.% Y-doped CeO2(2.0 g/L) demonstrated the highest removal rate for 20 mg/L of AO7 dye within just 20 min to reach adsorption–desorption equilibrium, half the time required by undoped CeO2, achieving an impressive adsorption rate of 94.6%, compared to only 69.5% for undoped CeO2at 20 min. The adsorption capacity of undoped CeO2was enhanced by 19.05% through the doping of 4 mol.% Y, achieving a value of 16.56 mg/L. The feasibility of enhancing the adsorption capacity of CeO2by Y doping provides a reference for the application of CeO2and other metal oxides.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Ke Chen,Linhan Ni,Hao Zhang,Chengming Xiao,Li Li,Xin Guo,Junwen Qi,Chaohai Wang,Xiuyun Sun,Jiansheng Li
Rational design of fillers and polymers is of great importance to fabricate mixed matrix membranes (MMMs) with high performance. In this work, fluorinated metal-organic frameworks (KAUST-7 (also referred as NbOFFIVE-1-Ni)) were adopted as nanofillers to prepare MMMs through physically blending into the polymer of intrinsic microporosity (PIM-1). Benefiting from the features of porous KAUST-7, including well CO 2 affinity, distinctive pore characteristics (size, shape, and functionality) and strong intermolecular interactions with PIM-1, the achieved MMMs demonstrated increased CO 2 /CH 4 separation performance and improved anti-physical aging property. Specifically, with the assistance of KAUST-7, the CO 2 permeability and CO 2 /CH 4 (30:70 vol%) selectivity of the optimized MMMs increased up to 5928 Barrer and 23.5, corresponding to improvements of 50% of and 88% of the permeability and selectivity compared with the pristine membranes, respectively. Importantly, 100-h continuous separation test results confirmed the satisfying long-term stability of the prepared MMMs. Notably, the MMMs maintained 91% of the initial CO 2 permeability after 150 days (decreased only 539 Barrer), implying that the CO 2 permeability decrement is about 5-fold lower than that of the control PIM-1 membrane. These results suggest that the fabricated MMMs are promising candidates for CO 2 separation in practical applications.
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
RSC Advances
·
2015
·Vol. 5
·期 121
·99935-99943
·
IF 3.84
Huanxuan Li,Jinquan Wan,Yongwen Ma,Yan Wang,Zeyu Guan
The impacts of common anions and organic matter, initial pH and PS dosage on the oxidation of acid orange 7 (AO7) by persulfate (PS) activated with zero-valent iron (ZVI) were investigated. The present findings revealed that maximum AO7 decolorization occurred at pH 3.0, and increasing the system pH resulted in a greater decrease in AO7 decolorization rates. AO7 decolorization efficiency was 100% at 120 min when the molar ratio of PS : AO7 was 5 : 1. Interestingly, ClO4−, CH3COO− and humic acid (HA) were found to accelerate AO7 decolorization rates while other anions retarded AO7 decolorization in the following sequence: NO2− > H2PO4− > HPO42− > EDTA > SO42− > CO32− > HCO3− > NO3− > Cl−. ClO4−, CH3COO− and HA with 50 mM, 10 mM and 1.0 mg L−1, respectively were found to be the optimal concentrations for AO7 decolorization. The removal efficiencies of AO7 were decreased by 90.3%, 51.5%, 58.7% and 38.2%, respectively over 120 min in addition of NO2− (50 mM), H2PO4− (50 mM), HPO42− (50 mM) and EDTA (50 mM). The other anions including SO42−, CO32−, HCO3−, NO3− and Cl− led to a decrease change of less than 20%. The mechanisms for the influence were complexation reactions with Fe2+ generated from ZVI, consuming of sulfate radicals (SO4−˙) by scavenging reactions, and oxidation reactions involving inorganic ions. The reason for the acceleration by CH3COO− and HA was probably through acting as an electron ‘shuttle’ and facilitating electron transfer from the ZVI surface to PS and resulted in more Fe2+ and SO4−˙. However, the acceleration caused by ClO4− was presumably ascribed to the oxidizing of ZVI directly by ClO4− to produce more Fe2+.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
Frontiers in Nutrition
·
2021
·
IF 6.576
Wei Wei,Fan Xiao-Man,Jia Shao-Hui,Zhang Xi-Ping,Zhang Zhao,Zhang Xue-Jun,Zhang Jiu-Xun,Zhang Ye-Wang
Sea cucumbers are one of many marine echinoderm animals that contain valuable nutrients and medicinal compounds. The bioactive substances in sea cucumbers make them have promising biological and pharmacological properties, including antioxidant, anti-bacterial, and anti-tumor effects. In this study, sea cucumber intestinal peptide (SCIP) is a small molecular oligopeptide (<1,000 Da) extracted from sea cucumber intestines hydrolyzed by alkaline protease. The analysis of amino acid composition showed that hydrophobic amino acids and branched-chain amino acids were rich in SCIP. Nowadays, although increasing studies have revealed the biological functions of the sea cucumber active substances, there are few studies on the function of SCIP. Furthermore, due to the anti-cancer activity being an essential characteristic of sea cucumber active substances, we also investigated the anti-cancer potential and the underlying mechanism of SCIP in vivo and in vitro. The results indicate that SCIP inhibits the growth of MCF-7 tumor cells in zebrafish and increases the apoptosis of human breast cancer MCF-7 cells. Further mechanism studies confirm that SCIP promotes the expression of apoptosis-related proteins and thus promotes the breast cancer cells (MCF-7) apoptosis via inhibition of PI3K/AKT signal transduction pathway.
研究领域:
海洋生物学
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药理学
·
肿瘤学
·
细胞生物学
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DOI
PubMed
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2015
·Vol. 30
·期 5
·1098-1102
·
IF 0.399
Zhou Yong,Liu Fude,Wu Haiyan,Duan Lijie,Qu Boyang
One conjugated polymer consisting of carbazole and 3-hexylthiophene moiety, poly (N-Hexyl-2,7-di(2-(4-hexylthiophene)carbazole) (PNDC), has been synthesized by ferric chloride oxidative polymerization. The monomer N-Hexyl-2,7-di(2-(4-hexylthiophene)carbazole was synthesized and characterized by IR, 1 H-NMR, 13 C-NMR and MS. UV-vis absorption spectrum, fluorescence spectrum, photoluminescence spectrum and electrochemical properties of the polymer were investigated. Polymer PNDC shows maximum peak appearing at 394 nm in UV-vis absorption spectrum, strongest fluorescence-emission at 482 nm in fluorescence spectrum and maximum emission peak at 492 nm in photoluminescence spectrum. The band-gap ( E
g ), HOMO energy ( E
HOMO ), and LUMO energy ( E
LUMO ) of the polymer were obtained as 2.58, -5.32, and -2.74 eV, respectively.
研究领域:
材料科学
·
有机化学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2023
·
IF 4.6
Jiang-Tao Xue,Zhi-Neng You,Bing-Yi Yang,Zheng-Yu Huang,Jiang Pan,Chun-Xiu Li,Jian-He Xu
7-Oxo-lithocholic acid (7-oxo-LCA) is a key precursor for the enzymatic synthesis of the therapeutic bile acid ursodeoxycholic acid (UDCA). Chenodeoxycholic acid (CDCA) can be readily converted to 7-oxo-LCA by the 7α-hydroxysteroid dehydrogenase (7α-HSDH). However, the poor substrate tolerance of the current 7α-HSDH limits their practical applications. In this study, a new and natively NAD(+)-dependent Sm 7α-HSDH from Shewanella morhuae was identified, which exhibited a better substrate tolerance compared with other 7α-HSDHs. The purified Sm 7α-HSDH showed a high oxidative activity of 281 U mg −1 protein toward CDCA, with a catalytic efficiency ( k cat /K m ) of 7.47 × 10 3 mM −1 s −1 . In a preparative biotransformation (100 mL scale), 200 mM (∼80 g L −1 ) CDCA was almost completely oxidized to 7-oxo-LCA in 1 h, with a 78% isolated yield and a space-time yield (STY) of up to 1418 g L −1 d −1 , which is so far the highest productivity for biosynthesis of 7-oxo-LCA from CDCA. These results demonstrate the great potential of Sm 7α-HSDH as a promising biocatalyst for UDCA synthesis.
研究领域:
生物化学
·
医药化学
·
酶工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）