Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 6
·125570
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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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高影响因子
FOOD CHEMISTRY
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2025
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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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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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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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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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JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Mingwei Zhao,Mingwei Gao,Caili Dai,Mingyong Du,Yifei Liu,Chenwei Zou,Jiaping Tao,Xinke Wang,Tao Wang
In this work, we report a simple class of photo-responsive system that consists of cationic surfactant , N -methyl- N -cetylpyrrolidinium bromide (C 16 MPB), and the photoresponsive organic derivative, trans - ortho -methoxycinnamic acid ( trans -OMCA). The system is studied by UV spectra, cryo -transmission electron microscopy, and rheological measurements. C 16 MPB and trans -OMCA in basic aqueous solution can self-assemble to form viscoelastic wormlike micelles . Upon exposure to UV light , OMCA undergoes a photoisomerization from trans to cis , which results in a change of the geometry of the C 16 MPB–OMCA complexes. The wormlike micelles can transform into spherical or rodlike micelles. We hope this study may enrich the understanding of photo-responsive wormlike micelles composed by cationic surfactants and photo-sensitive additives in water.
研究领域:
软物质物理
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胶体与界面科学
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光响应材料
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表面活性剂化学
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流变学
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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
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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高影响因子
Small
·
2022
·Vol. 18
·期 15
·2106581
·
IF 15.153
Zhaolin Gou,Huiqi Qu,Hanfang Liu,Yiru Ma,Lingbo Zong,Bin Li,Congxia Xie,Zhenjiang Li,Wei Li,Lei Wang
2D heterostructures provide a competitive platform to tailor electrical property through control of layer structure and constituents. However, despite the diverse integration of 2D materials and their application flexibility, tailoring synergistic interlayer interactions between 2D materials that form electronically coupled heterostructures remains a grand challenge. Here, the rational design and optimized synthesis of electronically coupled N-doped mesoporous defective carbon and nitrogen modified titanium carbide (Ti 3 C 2 ) in a 2D sandwiched heterostructure, is reported. First, a F127-polydopamine single-micelle-directed interfacial assembly strategy guarantees the construction of two surrounding mesoporous N-doped carbon monolayers assembled on both sides of Ti 3 C 2 nanosheets. Second, the followed ammonia post-treatment successfully introduces N elements into Ti 3 C 2 structure and more defective sites in N-doped mesoporous carbon. Finally, the oxygen reduction reaction (ORR) and theoretical calculation prove the synergistic coupled electronic effect between N-Ti 3 C 2 and defective N-doped carbon active sites in the 2D sandwiched heterostructure. Compared with the control 2D samples (0.87–0.88 V, 4.90–5.15 mA cm −2 ), the coupled 2D heterostructure possesses the best onset potential of 0.90 V and limited density current of 5.50 mA cm −2 . Meanwhile, this catalyst exhibits superior methanol tolerance and cyclic durability. This design philosophy opens up a new thought for tailoring synergistic interlayer interactions between 2D materials.
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高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2022
·Vol. 51
·期 7
·735-751
·
IF 2
Zhao Zhongqian,Chen Xiumin,Wu Jian,Wang Wenjing,He Bingyang,Yin Qi,Xu Peilin,Liu Li
Density functional theory was used to study the effect of N , N -diethylacetamide (DEAc) in the preparation of ferrous oxalate dihydrate. The calculation results indicated that DEAc molecules can affect the growth of ferrous oxalate dihydrate crystals by hydrogen bonding and van der Waals forces with \({\text{C}}_{2} {\text{O}}_{4}^{2 - }\) or H 2 O in ferrous oxalate dihydrate crystals. DEAc encases ferrous oxalate dihydrate crystals to inhibit crystal growth, and preferentially binds to both sides of \({\text{C}}_{2} {\text{O}}_{4}^{2 - }\) to control the axial growth of ferrous oxalate dihydrate crystals. The experimental program was conducted based on these theoretical calculation results. Rod-shaped particles with a particle size of 100 nm were obtained by adding DEAc during the preparation of ferrous oxalate dehydrate. Therefore, DEAc had a significant effect on the particle size of the ferrous oxalate dihydrate. The theoretical calculations were thus confirmed by the experimental results. And this work explains the growth mechanism of the ferrous oxalate dihydrate.
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BIOORGANIC CHEMISTRY
·
2022
·
IF 5.307
Han Xu,Ninghua Fu,Jie Zheng,Muhammad Sohail,Xing Zhang
Metal-organic frameworks (MOFs), as advanced enzyme immobilization platforms for improving biocatalysis and protein biophysics, are rarely investigated as solid supports in the enzymatic synthesis of carbohydrate and derivatives, which can be attributed to the complex biochemical reaction mechanisms and the adverse interactions between the high polarity of substrate sugars, glycoenzymes and traditional MOFs. Here, we introduced divalent metal ion Mn 2+ into MOF to prepare bimetallic MOF microreactor that encapsulated N -acetylhexosamine 1-Kinase (NahK), a critical anomeric kinase involved in the enzymatic synthesis of sugar nucleotide. The introduced Mn ions not only adjusted the microstructure of MOFs, but also participated in the enzymatic catalysis as cofactor, thus facilitated the N -acetylglucosamine/ N -acetylgalactosamine (GlcNAc/GalNAc) phosphorylation. The Mn-doped [email protected] organic material (MOM), integrated with high catalytic activity, high stability, and high recoverability, solved the issues of immobilization related to glucokinase activity. These features significantly improved the operability and reduced the processing cost, assuring industrial application prospects for sugar nucleotides synthesis.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Shuai Zhang,Xiaoyu Fan,Shuhan Jiang,Rentian Guan,Xiaodong Shao,Shuhao Wang,Qiaoli Yue
Trace moisture was firstly measured in methanol, ethanol and n-propanol at room temperature. The N, P-codoped carbon dots (CDs) were prepared by one pot solvothermal method, which displayed solvent-dependent fluorescence. The N, P-codoped CDs exhibited green fluorescence, with the quantum yields (QY) of 27.9%, 37.4%, 26.2% and 2.3% in methanol, ethanol, n-propanol and water, respectively. Based on the hydrogen bond interactions between the protic solvents and the N, P-codoped CDs, with the water content increased, the fluorescence intensity of N, P-codoped CDs gradually decreased in methanol, ethanol and n-propanol. The decrement in the fluorescence intensity is linearly related to the water content within the content range of 2% to 8%, 0.04% to 5% and 0.04% to 1.0%, with a limit of detection of 0.22%, 0.009% and 0.021% in methanol, ethanol and n-propanol, respectively. Therefore, the present system has a prospective value for the application in the determination of trace water in the relevant fields.
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高影响因子
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