JOURNAL OF MEMBRANE SCIENCE
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2011
·
IF 3.673
Xiao-Lin Li,Li-Ping Zhu,You-Yi Xu,Zhuan Yi,Bao-Ku Zhu
A novel method for the preparation of hydrophilic and positively charged nanofiltration (NF) membranes was developed. An active top-layer with NF characteristic was composited onto polysulfone (PSf) ultrafiltration substrate by UV-induced graft polymerization of N , N -dimethylaminoethyl methacrylate (DMAEMA) followed by quaternization cross-linking with p -xylylene dichloride (XDC). Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and atomic force microscopy were employed to monitor membrane surface chemical and morphological changes after poly(DMAEMA) grafting and quaternization cross-linking. The influences of UV irradiation time, monomer DMAEMA concentration, the cross-linker XDC concentration on the separation and permeation properties of membrane were investigated. The surface hydrophilicity of the composite membranes was evaluated by contact angle measurement. It was found that membrane hydrophilicity was obviously enhanced after UV-induced grafting and quaternization cross-linking. As the UV irradiation time and DMAEMA monomer concentration were increased, salts rejection of the composite membranes increased while water permeability decreased. Under the optimized preparing conditions, water flux and MgCl 2 rejection (1.0 g/L) of the composite membranes reached 60.3 L/(m 2 h MPa) and 93.2%, respectively. The membrane surface charge property was measured via a streaming potential method. It was found that, at pH from 4.5 to 9, the composite membranes showed positive zeta potentials. The rejections of the composite membranes to different salts followed the order Na 2 SO 4 < NaCl < MgSO 4 < MgCl 2 < CaCl 2 . Moreover, the composite NF membranes showed a good stability in water-phase filtration process.
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高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 21
·5663-5672
·
IF 7.779
Qixuan Qin,Asu Li,Yizhuo Fan,Xindong Zhang
In this work, Au nanoparticle-loaded ZnO/ZnFe2O4 (Au-ZnO/ZnFe2O4) microspheres were prepared using a combination of a two-step hydrothermal process and a co-precipitation method. The SEM and TEM analyses showed that the synthesized Au-ZnO/ZnFe2O4 samples were microspheres with a yolk–shell structure assembled from nanosheets. Gas-sensitive performance tests indicated that Au-ZnO/ZnFe2O4 showed the highest response to 100 ppm acetone (18.18), higher than those of ZnFe2O4 (8.4) and ZnO/ZnFe2O4 (11.6). In addition, the optimum operating temperature of Au-ZnO/ZnFe2O4 decreased from 279 to 206 °C compared to ZnFe2O4 and ZnO/ZnFe2O4. In addition, Au-ZnO/ZnFe2O4 yolk–shell microspheres exhibited fast response and recovery times (4 and 23 s, respectively). The sensor has a lower limit of acetone detection (0.7 ppm) at 85% RH and is able to effectively differentiate diabetic patients from healthy subjects by detecting acetone in their exhaled breath. The enhanced response of Au-ZnO/ZnFe2O4-based sensor is attributed not only to its high specific surface area but also to the synergistic effect of the n–n heterojunction structure of ZnO-ZnFe2O4 and the catalysis of Au nanoparticles.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·
IF 2.8
Boyun Gao,Huijiang Huang,Mooeez Ur Rehman,Bin Ren,Yuruo Liu,Weipeng Fan,Pengfei Li,Lizhi Zhang,Yan Xu,Yujun Zhao
BACKGROUND The synthesis of fatty amines via fatty alcohol amination offers a promising avenue for environmentally friendly production, particularly when compared with the methods employing hydrocyanic acid which often involve significant emissions. RESULT This study explores the synthesis of n-hexylamine through one-step amination of n-hexanol utilizing a series of Ru-doped Ni catalysts supported over γ-Al 2 O 3 , achieving 61% n-hexanol yield, 35% dihylamine yield and 3.5% trihylamine yield at the n-hexanol conversion of 99%. CONCLUSION The characterization results of the catalysts revealed a significant interaction between ruthenium and nickel in the bimetallic catalysts, leading to the enhanced reducibility of Ni species and improved metal dispersion. Moreover, ruthenium species were found to play an important role in the dissociation of NH 3 into NH x (x = 1, 2), thereby significantly improving the dehydrogenation process of n-hexanol at Ni sites. The synergistic effect between the two kinds of metal sites emerges as crucial factor for the boosted alcohols amination process. © 2024 Society of Chemical Industry (SCI).
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 6
·125570
·
IF 7.5
Yan Zhang,Guannan Ren,Hongfen Zuo,Mingjia Liao,Ningrui Zhang,Zhou Xu,Genghao Gong
An interlayer regulates organosilica deposition on porous polymer supports. • A 150 nm organosilica layer was obtained after two spray cycles. • The membrane achieved a flux of about 1.0 kg m⁻² h⁻¹ for DMF dehydration. • The membrane maintained relatively stable performance over 50 h. Pervaporation dehydration of N,N-dimethylformamide (DMF) is challenging because low-viscosity organosilica sols can penetrate porous polymer supports during selective-layer deposition. In this work, a polyarylate (PAR) interlayer was introduced onto a porous poly(ether ether ketone) (PEEK) support by interfacial polymerization to regulate the deposition of a bis(triethoxysilyl)ethane (BTESE)-derived organosilica layer by ultrasonic spray coating. Cross-sectional SEM observations showed that the PAR interlayer reduced BTESE-sol penetration into the porous PEEK support and facilitated the formation of a relatively thin BTESE-derived layer. The selected membrane prepared with two spray-coating cycles exhibited a BTESE-layer thickness of approximately 150 nm. For a 90 wt% DMF/water feed at 50°C, the membrane achieved a total permeation flux of approximately 1.0 kg m⁻² h⁻¹ with a separation factor of 3–4. During 50 h of continuous operation, the permeation flux decreased initially and subsequently remained relatively stable, while the separation performance showed no pronounced deterioration under the tested conditions. Additional pervaporation experiments with NMP/water and DMAc/water mixtures showed different permeation and separation behaviors. Overall, the results indicate that the PAR interlayer can regulate BTESE-sol deposition on the porous PEEK support and facilitate the fabrication of a thin organosilica composite membrane for pervaporation dehydration under the investigated conditions. Download: Download high-res image (287KB) Download: Download full-size image
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CRYSTENGCOMM
·
2013
·Vol. 15
·期 32
·6368-6373
·
IF 3.879
Shuling Xu,Lei Wang,Haibo Li,Qiaoli Yue,Rui Li,Jifeng Liu,Xiaohong Gu,Shuqiu Zhang
Novel three-dimensional Ag nanoflowers (3DAN) were successfully synthesized through a facile Cu2+ mediated solution method using N,N-dimethylformamide (DMF), which serves as both a reducing agent and a solvent at room temperature. It was found that the introduction of a trace amount of Cu2+ could greatly slow the rate of the Ag+ reaction and thus this process effectively reduced the growth speed of Ag nanoparticles allowing 3DAN to be formed. The mechanism underlying the self-assembly process and shape evolution of 3DAN were systematically investigated by varying reaction time. X-Ray powder diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) were used to characterize the structure and morphology of the obtained products. X-Ray photoelectron spectroscopy (XPS) was used to assess the chemical state and surface composition of the 3DAN. UV-vis absorption spectra of the products collected from the reaction solution at various stages were taken to study their optical properties. In the measurement of surface-enhanced Raman scattering using rhodamine 6G (R6G) as the probe, the 3DAN exhibited a significant enhancement factor, indicating their potential applications in biosensing and nanodevices.
研究领域:
纳米医学
·
生物传感
·
材料科学
·
胶体化学
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分子影像学
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Zhuoning Cao,Chengqiang Li,Hong Jiang,Francesco Secundo,Xiangzhao Mao
β- N -acetylhexosaminidases garnered attention in the enzymatic synthesis of lacto- N -triose II (LNT2) as the backbone precursor of human milk oligosaccharides (HMOs). In this study, β- N -acetylglucosaminidases Hex(Sv)-2557 from Streptomyces violascens ATCC 27968 was engineered based on a stabilizing intermediate strategy to improve its transglycosylation activity for LNT2 synthesis. A mutant Hex(Sv)-2557(D297K) with a transglycosylation activity of 38.4 U/mg with p NP-GlcNAc −1.9-fold higher than that of Hex(Sv)-2557– was obtained and characterized. Instead, the hydrolase activity of the mutant was 73 % lower compared to the wild-type enzyme. Importantly, the mutant can use N -acetyl chitobiose (GlcNAc 2 ) as the donor for LNT2 synthesis. The LNT2 yield of 14.85 % was obtained when the synthetic reaction, catalyzed by the mutant Hex(Sv)-2557(D297K), started from whey powder and GlcNAc 2 -prepared from chitin by chitinase ChiA and ChiB. This study has altered the donor for the action by directed modification and promoting the high-value utilization of whey powder and chitin.
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DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN TOXICOLOGY
·
2026
·
IF 4.1
Naijie Wei,Xiaowen Yan,Mingyue Yu,Rong Li,Zhixin Xiao,Shi Chen,Limin Yang,Qiuquan Wang,Qian Liu,Guibin Jiang
N-(1,3-Dimethylbutyl)-N’-phenyl-p-phenylenediamine Quinone (6PPDQ) not only causes acute mortality in salmon but also induces toxicities in other living organisms. The electrophilic quinone moiety in the 6PPDQ molecular structure can participate in binding to the cysteine residues that ubiquitously exist in protein nucleophiles, which are responsible for its toxicities. Out of the 82 6PPDQ-bonded proteins found in the human model cell line A549 on the sulfhydryl-reactive proteomics platform, which enables the precise identification of covalent binding protein targets of a pollutant, we discovered three 6PPDQ-bonded mitochondrial proteins─NDUS6, COX5B, and ATP5PB─that are involved in mitochondrial dysfunction for the first time. They impede the function of mitochondria, as witnessed by the decreased enzymatic activities of mitochondrial respiratory chain Complexes I (27.63%) and IV (23.11%), the decreased cellular ATP content (19.94%), and the reduced mitochondrial membrane potential (3.2-fold), as well as the elevated mitochondrial ROS level (2.2-fold) under the environmentally relevant 8.9 μg/L 6PPDQ exposure compared to the controls. Our findings provide experimental evidence for elucidating 6PPDQ’s toxicities at the molecular level, and the knowledge learned will enhance the public’s awareness of the adverse impacts of environmental pollution on health.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xiaoyan Zheng,Hanwen Yan,Junyang Liu,Jie Li,Junping Zhang,Songsong Chen,Hongnan Chen,Gang Wang,Chunshan Li
Two types of N -methylation and N -formylation during MAL synthesis was revealed. • Comprehensive thermodynamic and kinetic studies were systematically conducted. • The formate species was identified as the key intermediates for these reactions. • Reaction networks for N -methylation and N -formylation were proposed. Synthesis of methacrolein (MAL) from propionaldehyde and formaldehyde (FA) via mild Mannich reaction catalyzed by sec-amine is a crucial step for methyl methacrylate (MMA) production. However, the undesired N -methylation and N -formylation of catalytically active sec -amine centers by FA leads to catalyst consumption. In this work, comprehensive thermodynamic and kinetic investigations were conducted for these two types of crucial side reactions on the basis of reaction networks understanding. It was identified by in situ ATR FTIR that the generated formic acid/formate species are responsible for the formation of N -methyldiethanolamine and N, N -bis (2-hydroxyethyl) formamide byproducts. Thermodynamic analyses confirmed required parameters and demonstrated that these reactions are both exothermic and product-favored under standard condition, with N -methylation exhibiting much stronger driving force than N -formylation. Kinetic assessments further revealed reaction rate constants, reaction orders and activation energies, with deviation within 5%, and lower reaction barrier of N -formylation than N -methylation. These findings suggest practical strategies for reaction process optimization and catalyst stability improvement.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xiaohong Shang,Qingmei Xing,Xinxin Ji,Fenghe Duan,Chuanpan Guo,Qiaojuan Jia,Shuai Zhang,Bin Hu,Zhihong Zhang
Herein, a robust photoelectrochemical (PEC) immunosensor was constructed based on an n-n heterojunction between a copper-porphyrin-based metal organic framework and Bi 2 S 3 (Bi 2 S 3 @Cu-TPyP) for efficient detection of gentamicin (GEN). The integration of Cu-TPyP features (enhanced electron transfer capability, improved photoabsorption performance, large specific surface area, and high antibody bioaffinity) with Bi 2 S 3 characteristics (narrow bandgap and visible light absorption capacity) established an efficient interfacial architecture. Enhanced separation of photogenerated electron-hole pairs and improved photoelectric conversion efficiency in the Bi 2 S 3 @Cu-TPyP heterojunction contributed to the amplified photocurrent. The immunosensor exhibited an ultralow detection limit of 0.041 fg mL −1 (1.0 fg mL −1 –1.0 ng mL −1 linear range) with high selectivity and validated applicability in analyzing GEN across diverse food matrices. This study establishes a PEC biosensing paradigm enabling ultrasensitive and rapid antibiotic monitoring in food products due to the synergistic signal amplification mechanisms without compromising specificity.
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高影响因子
Materials
·
2025
·Vol. 18
·期 20
·4705
·
IF 3.2
Weijie Hua,Huixin Yuan,Songhua Huang
This research successfully synthesized a novel n-n heterojunction Bi2O2CO3/AgVO3nanocomposite photocatalyst via the in situ chemical deposition process. Characterization results strongly confirmed the formation of a tight heterojunction at the Bi2O2CO3/AgVO3interface. The nanocomposite exhibited characteristic XRD peaks and FT-IR vibrational modes of both Bi2O2CO3and AgVO3simultaneously. Electron microscopy images revealed AgVO3nanorods tightly and uniformly loaded onto the surface of Bi2O2CO3nanosheets. Compared to the single-component Bi2O2CO3, the composite photocatalyst exhibited a red shift in its optical absorption edge to the visible region (515 nm) and a decrease in bandgap energy to 2.382 eV. Photoluminescence (PL) spectra demonstrated the lowest fluorescence intensity for the nanocomposite, indicating that the recombination of photogenerated electron–hole pairs was suppressed. After 90 min of visible-light irradiation, the degradation efficiency of Bi2O2CO3/AgVO3toward methylene blue (MB) reached up to 99.55%, with photodegradation rates 2.51 and 2.79 times higher than those of Bi2O2CO3and AgVO3, respectively. Furthermore, the nanocomposite exhibited excellent cycling stability and reusability. MB degradation was gradually enhanced with increasing the photocatalyst dosage and decreasing initial MB concentration. Radical trapping experiments and absorption spectroscopy of the MB solution revealed that reactive species h+and ·O2−could destroy and decompose the chromophore groups of MB molecules effectively. The possible mechanism for enhancing photocatalytic performance was suggested, elucidating the crucial roles of charge carrier transfer and active species generation.
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PubMed
高影响因子
Journal of Environmental Sciences
·
2026
·
IF 6.3
Qi Chen,Lingjun Bu,Yangtao Wu,Shumin Zhu,Yuwei Wu,Shiqing Zhou
This study systematically investigates the behaviors and mechanisms of N,N- dichloramine decomposition in new iron pipes (NIP) and corroded iron pipes (CIP). The half-life of N,N -dichloramine in the CIP is orders of magnitude shorter than in the NIP (0.46 min vs. 35.5 h), accompanied by substantial formation of ammonia (0.27 mg/L as NH 3 -N). We demonstrate that the Fe 2+ - N,N- dichloramine complex formed in CIP is a critical factor in catalyzing the decay of N,N -dichloramine and promoting ammonia formation. Density functional calculations confirm that the coordination bond formed between Fe 2+ and N,N -dichloramine effectively lowers the energy barrier for N,N -dichloramine decomposition via the nitrile pathway, thereby promoting ammonia formation. Furthermore, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) provides molecular-level evidence for the Fe 2+ - N,N -dichloramine complex-catalyzed deamination of CHNO compounds to CHO species. These findings suggest that metal-induced decomposition of organic chloramines could trigger unforeseen ammonia release, underscoring the need to account for disinfection strategies in iron-based DWDS.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Qi Chen,Jun Li,Wenhui Fu,Yaohua Yang,Wenqing Zhu,Jianhua Zhang
The development of ultrasensitive and down to ppb-level gas sensors for the accurate detection of volatile organic compounds (VOCs) in environmental monitoring is still a bottleneck that urgently needed to be overcome. Here, we report a high-performance N,N -dimethylformamide (DMF) gas sensor based on electrospun InYbO nanofibers field-effect transistor (FET). Owing to the high surface area of nanofibers, the gas sensor exhibits a remarkably high sensitivity of 89–2000 ppb DMF, fast response/recovery time (36/67 s), exceedingly low detection limit of 5 ppb and outstanding selectivity towards DMF against other typical gases as well as excellent stability and reliability. In particular, the developed gas sensor can obtain low theoretical limit of detection (LOD) of 1.18 ppb. Moreover, a possible sensing enhanced mechanism is also proposed and verified utilizing the capacitance-voltage ( C–V ) analysis. This work opens a new route for the electrospun nanofibers FETs as a promising sensing platform to realize high-performance and ultralow-concentration detection gas sensors.
研究领域:
材料科学
·
环境监测
·
传感器技术
·
纳米材料
·
分析化学
·
半导体器件
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高影响因子
危险品化学品经营许可证（带存储）