MICROCHEMICAL JOURNAL
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2023
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IF 4.8
Menghua Liu,Shuangying Li,Zhi Li,Yanhui Li,Yue Zhang,Jingwen Niu,Linchun Nie,Chunmao Chen,Qingxiang Zhou
Amoxicillin is one of the most important semi-synthetic penicillin broad-spectrum β-lactam antibiotics and has achieved many applications. There are few reports on its application for synthesizing carbon dots (CDs). Present work explored the possibility of amoxicillin converted into CDs with sodium carbonate used as the co-reactant employing facile hydrothermal method. The obtained CDs exhibited good selectivity and sensitivity to benzidine and could be explored as an effective fluorescence probe for monitoring benzidine. The fluorescence intensity of CDs was quenched based on the principle of static quenching due to the formation of a non-fluorescent complex between CD and benzidine. Within the range of 0.2–2 μM and 2–16 μM, CDs possessed good linear characteristics, high sensitivity, and a low detection limit of 0.08 μM. The results demonstrated that the fluorescence probe possessed the merits of simplicity, rapidity, low cost, short analytical time, high selectivity and sensitivity, and good stability. According to the verification results from the real water samples, the fluorescence probe had high reliability and feasibility, and could be employed for monitoring benzidine in waters.
研究领域:
分析化学
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环境监测
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纳米材料
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荧光传感
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药物化学
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 10
·1-11
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IF 5.3
Gu Yingqiu,Fang Puhao,Chen Yu,Xie Tianhua,Yang Guohai,Qu Lulu
A miniature multi-channel surface-enhanced Raman scattering (SERS) sensor based on polydimethylsiloxane (PDMS) is constructed to achieve rapid delivery of polluted water and specific identification of multiple components. Hg 2+ , organic pollutants, and sodium nitrite are successfully identified by the multi-channel SERS sensor using Cy5, cyclodextrin, and urea in the corresponding detection area. This multi-channel sensor exhibits excellent sensitivity and specificity, with detection limits of 3.2 × 10 −10 M for Hg 2+ , 1.0 × 10 −8 M for aniline, 6.9 × 10 −9 M for diphenylamine, 9.1 × 10 −8 M for PCB-77, and 7.5 × 10 −9 M for pyrene, and 5.0 × 10 −7 M for sodium nitrite. Compared with traditional analysis techniques, this method exhibited excellent recovery for the water pollutants ranging from 82.1 to 115.8%. The PDMS-based microchannel allows for simultaneous and rapid identification of multiple environmental pollutants, offering a portable detection method for emergency testing of environmental pollutants and routine determination of water pollutants. Graphical Abstract
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JOURNAL OF CHROMATOGRAPHY A
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2026
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IF 4
Le Zhang,Qianqian Wang,Lin Hao,Ying Zhao,Weihua Liu,Yaxin Liu,Zitian Li,Zhi Wang
A novel imidazole-functionalized COF (TPT-DB-COF) was constructed. • TPT-DB-COF showed good adsorption performance for neonicotinoid insecticides. • The adsorption mechanisms involve hydrogen bond, π-π interaction, and pore filling. • This method effectively detected neonicotinoid insecticides in four real samples. Developing an effective method for reliable monitoring of insecticide residues is desirable for public health. This study developed a rapid and sensitive method to determine neonicotinoid insecticides (NEONICs) in water, lemon beverage, wax gourd, and tomato samples. An imidazole-functionalized COF (TPT-DB-COF) featuring a spherical core-shell structure was developed and used as a solid-phase extraction (SPE) adsorbent. The TPT-DB-COF exhibited superior adsorption ability for NEONICs. The TPT-DB-COF-SPE/HPLC-DAD approach for trace analysis of NEONICs had low detection limits (0.02–0.03 ng mL −1 for water samples, 0.07–0.08 ng mL −1 for lemon beverage, 0.6–0.8 ng g −1 for wax gourd samples, and 0.9–1.3 ng g −1 for tomato samples), high trueness (method recoveries of 87.0% - 114%), and acceptable precision (relative standard deviations below 7.9%). Such good performance parameters pave the way for the application of TPT-DB-COF in the analysis of NEONICs. Download: Download high-res image (197KB) Download: Download full-size image
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JOURNAL OF MATERIALS SCIENCE
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2026
·Vol. 61
·期 34
·25244-25260
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IF 4.4
Xiong Yi,Zheng Zewei,Alam Mohammad Jahidul,Zhang Ke,Tang Yun,Repon Md. Reazuddin,Zhang Xiaoxiao,Chen Zimo,Zeng Wei,Mahmud Sakil
This study presents a novel synthesis and comprehensive characterization of nitrogen-doped carbon dots (CDs) derived from p-phenylenediamine (p-CDs), benzidine (b-CDs), and 1,5-diaminonaphthalene (n-CDs), highlighting their fluorescence properties for advanced sensing applications. By systematically varying the synthesis temperature (140–200 °C) and reaction time (12–24 h), we observed distinct precursor-dependent fluorescence responses. Increasing temperature induced a gradual redshift in p-CDs (438–450 nm) and n-CDs (397.8–403.8 nm), whereas b-CDs exhibited a pronounced blueshift (524–426 nm), reflecting differences in conjugation degree, carbonization behavior, and surface-state evolution. The CDs exhibit partially graphitized crystalline domains, with lattice spacings of 0.21–0.23 nm, and particle sizes ranging from 2.72 ± 1.63 nm (n-CDs) to 10.76 ± 4.15 nm (p-CDs). X-ray photoelectron spectroscopy (XPS) analysis reveals distinct nitrogen configurations (pyridine N, pyrrole N) and atomic compositions (e.g., 75.04% C1s in p-CDs), which critically influence their electronic structure. Solvent-dependent fluorescence studies revealed emission peaks spanning 404.8–620.0 nm. Dual-emission behavior was observed for p-CDs dispersed in benzene and chloroform, and for n-CDs dispersed in benzene, dimethylformamide (DMF), and acetonitrile, where strong π–π interactions and solvent-induced surface-state modulation generated secondary emission bands. Notably, acetonitrile enhances b-CDs’ fluorescence intensity by 1.5-fold, while ethanol maximizes n-CDs’ emission. These findings highlight the potential of the synthesized CDs as solvent-responsive fluorescence probes for environmental monitoring. Graphical abstract
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2026
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IF 10.5
Yan Sun,Yafei Qian,Ning An,Jingwei Huang,Houde She,Lei Wang,Qizhao Wang
The [3+3]-type TAPT-MCOF with enhanced surface area and favorable mass transport was constructed, accompanied by the [3+2] Dip-MCOF as counterpart. • The electron-deficient-rich design in TAPT-MCOF highly intensify local asymmetric charge distribution and facilitate photogenerated carrier separation. • TAPT-MCOF exhibits significant improvement in dual-photocatalysis, both of the production rate in H 2 O 2 synthesis and CO 2 conversion are higher than Dip-MCOF. Photocatalytic technology is an effective approach to address energy shortages and environmental problems. However, developing efficient and stable multifunctional photocatalysts remains a challenging task. In this study, two metal-covalent organic frameworks (MCOFs) were synthesized using a trinuclear copper cluster as the electron-rich node: TAPT-MCOF with a [3+3] configuration and Dip-MCOF with a [3+2] configuration. In the absence of sacrificial agent, TAPT-MCOF exhibits improved visible-light-driven photocatalytic performance in both hydrogen peroxide (H 2 O 2 ) synthesis and carbon dioxide (CO 2 ) reduction. The H 2 O 2 production rate is 261.8 μmol g -1 h -1 , about 2.4 times that of Dip-MCOF. The reaction rate for CO 2 reduction is also higher than that of Dip-MCOF. The enhanced behavior originates from two synergistic effects: (ⅰ) the specific surface area of TAPT-MCOF in the [3+3] configuration affords favored transport channels for efficient mass migration, including the reactants and products; and (ⅱ) the triazine group with electron-deficient property (EDP) and the trinuclear copper (Cu 3 Py) cluster with electron-rich property (ERP) in TAPT-MCOF create a highly intensified local asymmetric charge distribution, effectively promoting the photogenerated electron-hole separation. This finding provides guidance for designing efficient bifunctional photocatalysts by leveraging the dual structure regulation of porous frameworks. The [3+3] configuration and relatively electron-deficient triazine unit endow TAPT-MCOF with enhanced mass and charge transport, promoting its bifunctional photocatalytic performance for both H 2 O 2 synthesis and CO 2 reduction. Download: Download high-res image (293KB) Download: Download full-size image
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Rutong Zhang,Xiaolei Fu,Weiqiao Zhong,Rong Lei,Lu Li,Yuhuan Nie,Qibin Chen
High-performance enantioseparation membranes have the great practical value in racemic mixture separation, since conventional chiral membranes often encounter a severe permeability/enantioselectivity trade-off, which remarkably restricts their large-scale applications. This work aimed to fabricate the retarded transport membrane that has great potential to alleviate the trade-off using the chiral hyper-crosslinked polymer (CHCP) nanotube. Here, a series of CHCP-based membranes (CHCPMs) was prepared via vacuum-assisted filtration, in which the chiral recognition unit ( D -phenylalanine, D -Phe) was incorporated into the main skeleton of nanotubular HCPs via a co-crosslinking method. Results show that CHCPMs display a 2–4 orders of magnitude improvement in flux as compared to traditional enantioseparation membranes and an approximately 1 order of magnitude increase in flux relative to GO-based analogues ones, accompanied by the outstanding enantioselectivity; as the nanotube-based membranes, such amine-modified CHCPMs exhibit a ca. 37% and 23% improvement in enantioselectivity and flux, respectively, compared to the hydroxyl-modified CHCPM reported in our previous work under the same conditions. Moreover, CHCPMs follow a retarded transport mechanism, further supported by density functional theory calculation methods. The amine group introduced within the nanoconfinement space can activate the non-stereoselective interaction, which plays a critical role in enhancing enantioselectivity. Our findings highlight the demand for considering the more subtle molecular structure design and modification when optimizing a particular functional property of enantioseparation membranes
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ADVANCED FUNCTIONAL MATERIALS
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2026
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IF 19.9
Yun Shen,Shideng Yuan,Fuping Han,Jiaojiao Zhang,Dong Wang,Xin Liu,Peijun Zheng,Xiang Ma,Yiming Li,Zhining Wang
Elucidating the structure-performance relationship of polyamide (PA) nanofilms from monomer structure is essential for advancing organic solvent nanofiltration (OSN) membranes. However, most efforts focused on isolated molecular structure, lacking systematic structural control and rational guidance for the membrane fabrication. Herein, we employed a network-based design strategy by selecting aromatic amine monomers with different configurations and functionalities to construct PA nano-networks. Variations in monomer geometry and enhanced steric hindrance directed the topological growth of the polymer network and suppressed dense PA chain stacking, enhancing the porosity and solvent permeance of the membranes. Meanwhile, the membrane pore size can be further modulated to match the target solute by adjusting the monomer functionality. These insights established a cross-scale structure-performance relationship from monomer structure to network microstructure and ultimately to membrane performance. The optimized thin-film composite (TFC) membrane fabricated with a star-shaped trifunctional monomer (tris (4-aminophenyl) amine, TAPA) exhibited exceptional permselectivity, with a methanol permeance of 13.96 L m −2 h −1 bar −1 and photosensitizer rejection of 99.38%. The TFC-TAPA membrane achieved a 20-fold greater enrichment efficiency for photosensitizer than a commercial OSN membrane. This work provides molecular-level insights and guidance for the rational design of high-performance OSN membranes through monomer geometry and functionality control.
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FOOD CHEMISTRY
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2026
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IF 10.4
Ziyi Yin,Xiaoqing Wang,Qianqian Wang,Chun Wang,Yujie Ma,Mingming Xu,Qiuhua Wu
Phenolic endocrine disrupting compounds (PEDCs) are associated with significant health hazards, necessitating the development of highly sensitive analytical detection methodologies. This study reported a novel covalent organic framework (DT-COF) by strategically incorporating hydroxyl-rich building blocks into π-conjugated architectures. DT-COF demonstrated enhanced adsorption effect for PEDCs through the multiple hydrogen bond binding and multiple π-π interaction sites. By using DT-COF as a solid phase extraction adsorbent and integrating it with high performance liquid chromatography tandem the mass spectrometry, a robust analytical platform was provided to determine the trace PEDCs in green tea beverages, bottled water, and milk. Under optimized conditions, the method exhibited excellent analytical performance, including a low detection limit (0.018–0.219 ng mL −1 ), good recovery rates (86.3–109%), and outstanding reproducibility (RSDs ≤6.6%). This study achieves dual objectives: enabling sensitive detection of PEDCs contaminants while pioneering functional COF material development.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Jianyu Li,Wenbo Li,Qiong He,Ruiqing Luo,Chiyang He
Synthesis of moderate–sized uniform spherical covalent organic frameworks (COFs) within 10–50 μm is crucial for their applications in separation fields, while the spherical 2D COFs with such particle sizes has not been reported till now. Herein, a type of moderate–sized spherical 2D COF (TFB–BD COF) with uniform size within 10–50 μm was size–controllably synthesized via an ‘emulsion polymerization–crystallization’ strategy. The obtained TFB–BD COF showed monodisperse full–spherical morphology, good crystal structure and uniform controllable particle sizes. Moreover, another spherical 2D COF (TAPT–PDA COF) with particle size of 15 μm was also synthesized through a similar method for investigating the application potential of the spherical 2D COFs. As an application case, the spherical TAPT–PDA COF was used as the adsorbent for the disperse solid–phase extraction (d–SPE) of bisphenol F (BPF). The adsorbent showed good adsorption selectivity, high adsorption capacity, fast binding kinetics, good reusability (at least four cycles) and high enrichment factor (60 folds). By combining this d–SPE technique with high–performance liquid chromatography, a new analytical method was established for determination of trace BPF in water samples and an orange juice with recoveries of 94.8–101.6% and LOD of 0.56 ng/mL. The synthesis strategy proposed in this work opens a way for size–controllably synthesizing moderate–sized spherical 2D COFs, and the developed analytical method provides a viable path for detecting trace BPF in water samples and beverages.
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Food Chemistry-X
·
2026
·
IF 9.2
Yaonan Liu,Yue Yang,Jing Zhang,Zhenxia Du,Yan Tang,Luhong Wen
Establishing a convenient and sensitive method for the enrichment and analysis of benzoylurea insecticides (BUs) in fruits and vegetables is essential for food safety monitoring. To this end, a novel fluorine-rich magnetic covalent organic framework (Fe 3 O 4 @COF-F) was designed and synthesized as an adsorbent in magnetic dispersion solid phase extraction (MDSPE), enabling efficient capture of BUs through synergistic interactions. This material exhibited rapid adsorption (4 min) and high adsorption capacities (150.1–163.1 mg g −1 ). By coupling Fe 3 O 4 @COF-F-based MDSPE with pulsed direct current electrospray ionization (PDESI), an ambient mass spectrometry (AMS), a rapid approach was established for the determination of BUs in cucumbers, cabbages, and apples. The proposed MDSPE-PDESI-MS approach demonstrated good linearity ( r > 0.995), low limits of detection (LODs) of 0.16–0.30 ng g −1 , and satisfactory spiked recoveries (80.56–93.98%). This method shows great potential for high-throughput and sensitive analysis of BUs in complex food matrices.
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JOURNAL OF CHROMATOGRAPHY A
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2026
·
IF 4
Yue Yang,Yan Tang,Jing Zhang,Fei He,La Chen,Huanhuan Hong,Luhong Wen
An AFA-TD-DBDI-MS platform was constructed and optimized for THs analysis. • Hydroxyl-functionalized COF-coated stir bars showed high adsorption capacity. • SBSE-AFA-TD-DBDI-MS enabled THs detection with LODs of 0.0061–0.0312 ng/mL. • The developed method was promising for THs detection in complex matrices. Triazine herbicides are widely used in agricultural production. However, their environmental persistence and mobility pose potential threats to ecological safety and human health. Herein, a novel analytical method integrating stir bar sorptive extraction (SBSE) with airflow-assisted thermal desorption dielectric barrier discharge ionization mass spectrometry (AFA-TD-DBDI-MS), an ambient ionization mass spectrometry (AMS), was developed for the sensitive determination of triazine herbicides. A hydroxyl-functionalized covalent organic framework (COF-HF) was synthesized and used to fabricate COF-HF-coated stir bars via physical adhesion. The as-prepared stir bars exhibited outstanding extraction performance toward triazine herbicides, and the underlying adsorption mechanism was systematically investigated. The established COF-HF-based SBSE-AFA-TD-DBDI-MS method demonstrated good linearity (R² ≥ 0.9957), satisfactory recoveries (91.31%–98.81%), good repeatability (RSD ≤ 8.49%), and low limits of detection (0.0061–0.0312 ng/mL). This study provides a rapid and efficient strategy for monitoring trace triazine pollutants in environmental water and serum matrices. Download: Download high-res image (293KB) Download: Download full-size image
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Min Li,Juan Li,Tingyan Ye,Shuangjiang Li,Wenjun Zhang,Yutong Zhang,Yunfei Zhi,Pingyan Wang,Donghui Liu,Tianding Hu,Shaoyun Shan,Na Li,Yi Liu
The utilization of CO 2 as a sustainable carbon feedstock is an attractive strategy toward carbon neutrality, while the development of efficient heterogeneous catalysts under mild and co-catalyst-free conditions remains challenging. Herein, three porous organic polymer catalysts (PLZ, PLY, and PL-YZ) were synthesized through a one-step bidirectional polymerization strategy to systematically investigate the individual and synergistic roles of hydrogen-bond donor site (HBDs), Lewis basic N sites, and nucleophilic Cl − sites in CO 2 cycloaddition. Among them, PL-YZ exhibited the highest catalytic activity, affording chloropropylene carbonate in 93.1% yield with nearly 100% selectivity under optimized mild conditions (80 °C, 0.5 MPa CO 2 , 8 h) without any co-catalyst. In addition, PL-YZ maintained over 86% yield after five consecutive cycles and displayed broad substrate applicability toward various terminal epoxides. Kinetic analysis, in situ FT-IR spectroscopy, and DFT calculations consistently revealed that the cooperative interactions among HBD sites, Lewis basic N sites, and nucleophilic Cl − sites promote epoxide activation and ring-opening, facilitate CO 2 insertion, and accelerate cyclic carbonate formation. This study demonstrates the high product yields, selectivity, and recyclability of multifunctional porous polymer catalysts under mild conditions and establishes a practical design principle for integrating complementary active sites toward sustainable CO 2 conversion.
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