MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Lijun Wang,Jing Cao,Zhenni Yu,Haixia Hu,Xiao Yang,Xianggui Chen
The newly established lower maximum residue limit (MRL) for thiamethoxam (TMX) necessitates the development of more sensitive detection methods. This study presents a novel colorimetric-fluorescence sensing platform to detect TMX through graphene quantum dot (GQD)-mediated regulation of Fe 3 O 4 @Cu@PLL nanozyme activity. The mechanism investigation revealed that GQDs effectively suppress the peroxidase-like activity of Fe 3 O 4 @Cu@PLL by reducing and scavenging hydroxyl radicals (•OH) generated during catalytic reactions, which constitutes the fundamental principle of the dual-mode detection strategy. The sensing system was constructed through the hybridization of aptamer-functionalized Fe 3 O 4 @Cu@PLL (Fe 3 O 4 @Cu@PLL/Apt) with complementary DNA strand-modified GQDs (CS-GQDs), forming Fe 3 O 4 @Cu@PLL/Apt-CS/GQDs complexes. Following magnetic separation, two distinct detection channels were established: (1) The supernatant showed negligible fluorescence due to CS-GQDs removal, while (2) the precipitates exhibited suppressed peroxidase-like activity owing to GQD-induced inhibition. However, TMX presence triggered the dissociation of CS-GQDs from the complexes through competitive binding with the aptamer. This resulted in two measurable signals: a fluorescence signal recovery at 450 nm in the supernatant containing CS-GQDs, and restored nanozyme activity in the Fe 3 O 4 @Cu@PLL/Apt+TMX precipitates that catalyzed H 2 O 2 -mediated oxidation of TMB to blue-colored oxTMB. The optimized system achieved detection limits of 8 ng/mL (colorimetric) and 6 ng/mL (fluorescence), demonstrating high sensitivity. Validation experiments using three spiked samples (tea, beans, and kumquats) showed satisfactory recoveries ranging from 94.59 % to 108.23 %, confirming the method's reliability for accurate, on-site TMX detection in food matrices.
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高影响因子
Food Bioscience
·
2025
·
IF 5.9
Xueer Lin,Jiahui Zou,Guancheng Zhu,Linfeng Pang,Yuqi Chen,Yanyan Huang
To effectively overcome the shortcomings of traditional chromatographic and enzymatic methods for detecting organophosphorus pesticides, Cu-MOFs with inherent peroxidase (POD)-like activity were constructed for direct colorimetric detection of omethoate (OMT). Benefiting from the mesoporous and benzene ring structure, Cu-MOFs demonstrated excellent OMT enrichment capability. OMT exhibited a pronounced inhibitory effect on the POD-like activity of Cu-MOFs whereas other pesticides showed negligible interference, demonstrating the specific identification of OMT by Cu-MOFs. Experimental data and theoretical calculations indicated that OMT effectively bond to Cu-MOFs through Cu 2+ coordination and ligand binding. Owning to its enrichment, identification and catalytic abilities, OMT detection was achieved and the limit of detection (LOD) was 16 μg L −1 . Furthermore, a smartphone-assisted portable detection was established with a LOD of 79 μg L −1 . Validation experiments of cabbage samples confirmed its’ reliability for practical applications. Our system integrated the enrichment, identification, and detection of OMT within a single system, improving both sensitivity and operational convenience.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2016
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IF 3.349
Yan He,Qinqin Liu,Fei Liu,Chensheng Huang,Changjun Peng,Qiang Yang,Hualin Wang,Jun Hu,Honglai Liu
A triazine and thiophene bifunctionalized task-specific porous organic polymer with N and S atoms (TSP-NS) was synthesized from a simple one-step Friedel-Crafts reaction. The resulting novel porous polymer was determined to be highly effective in removing Cu (II) from aqueous solution. The maximum adsorption capacity , q max , evaluated from the Langmuir model was 98.33 mg g −1 . Moreover, the combination of experimental FTIR results and the theoretical quantum calculation demonstrated that the N and S heteroatoms of the bifunctionalized TSP-NS could easily form coordination complexes with Cu (II), which were responsible for efficient adsorption. The generated TSP-NS could be regenerated effectively and recycled at least five times without significant loss of adsorption capacity. Therefore, the convenience and low cost of synthesis, as well as the excellent adsorption capacity and reusability , made bifunctionalized polymer TSP-NS an attractive adsorbent for removing toxic metal ions from aqueous solution.
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WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 87
·期 2
·492-507
·
IF 2.43
Jiang Yu,Liu Xinyu,Huang Shikai,Wu Huifang,Liu Haiyan,Liu Shenzhe,Xu Jiale,Wang Kun
In this study, magnetic biochar (Fe-BC) was synthesized from phoenix tree leaves and FeSO 4 ·7H 2 O by impregnation-pyrolysis method, and was used to activate H 2 O 2 to degrade Cu-EDTA. The effects of preparation parameters on the degradation of Cu-EDTA by Fe-BC/H 2 O 2 system were investigated by degradation experiments and characterization methods (SEM, BET, FTIR, XRD and XPS). The results showed that the magnetic biochar prepared under the pyrolysis temperature of 400 °C, pyrolysis time of 3 h and iron content of 3 wt% had the best catalytic activity. Within 120 min, the breaking efficiency of Cu-EDTA binding, precipitation efficiency of Cu 2+ and removal efficiency of TOC could reach 78.48, 71.65 and 46.54% at the conditions of adding 1.0 g/L magnetic biochar and 25 mM H 2 O 2 and the iron dissolution was only 0.32 mg/L. The characterization results and comparison experiments demonstrated that the catalytic effect of magnetic biochar not only depends on the transfer of electrons to H 2 O 2 by the loaded iron oxides, but also the active oxygen functional groups (OFGs) and persistent free radicals (PFRs) contained on the surface can transfer electrons to H 2 O 2 or even dissolved oxygen to produce an amount of hydroxyl radicals ( · OH) and superoxide anion radicals ( ). The use of phoenix tree leaves as the precursor of magnetic biochar provides a new method for the disposal of garden waste, which is in accord with the concept of green and sustainable development. In the degradation system, the magnetic biochar catalyst relies on the OFGs and PFRs of biochar and the metal components loaded to activate H 2 O 2 to generate reactive oxygen species to degrade organic pollutants.
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高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2016
·
IF 1.34
Ai-ling YANG,Shun-pin LI,Yu-jin WANG,Le-le WANG,Xi-chang BAO,Ren-qiang YANG
Cu 2 O@Cu 2 O core-shell nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Cu 2 O@Cu 2 O NPs were easily converted to Cu 2 O@Cu NPs with the help of polyvinylpyrrolidine (PVP) and excessive ascorbic acid (AA) in air at room temperature, which was an interesting phenomenon. The features of the two kinds of NPs were characterized by XRD, TEM and extinction spectra. Cu 2 O@Cu NPs with different shell thicknesses showed wide tunable optical properties for the localized surface plasmon (LSP) in metallic Cu. But Cu 2 O@Cu 2 O NPs did not indicate this feature. FTIR results reveal that Cu + ions on the surface of Cu 2 O shell coordinate with N and O atoms in PVP and are further reduced to metallic Cu by excessive AA and then form a nucleation site on the surface of Cu 2 O nanocrystalline. PVP binds onto different sites to proceed with the reduction utill all the Cu sources in Cu 2 O shell are completely assumed.
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高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 85
·期 7
·2038-2050
·
IF 2.43
Zhang Ming,Zhang Kuo,Zhou Runjuan,Wang Jinpeng
In this study, a new type of iron/copper bimetallic combined with hydroxylamine (HA) activated peroxymonosulfate (PMS) was constructed to treat organic pollutants. Selecting the azo dye acid orange 7 (AO7) as the representative of organic pollutants, the new system can achieve nearly 100% degradation of AO7 within 5 min. The Fe(III)/Cu(II)/HA/PMS system mainly generates SO 4 ·− to achieve the degradation of AO7 in acidic environment, while neutral and alkaline environments rely on · OH. The presence of hydroxylamine accelerates the cycle of Fe(III)/Fe(II) and Cu(II)/Cu(I) in the system, and enhances the degradation ability of the system for organic pollutants. The addition of trace Cu(II) (1 μM) enhances the ability of a single Fe(III)/HA/PMS system to degrade AO7 in neutral and alkaline environments without causing secondary copper pollution. The common inorganic anions Cl − and NO 3 − in water have almost no effect on the degradation of AO7 in the system. The constructed Fe(III)/Cu(II)/HA/PMS system is an efficient and clean organic pollutant wastewater treatment process, which has very promising application prospects. The effect of hydroxylamine on the activation of peroxymonosulfate in Fe(III)-Cu(II) bimetallic is reported for the first time. The Fe(III)/Cu(II)/hydroxylamine/peroxymonosulfate system can remove 100% of AO7 within 5 min. Hydroxylamine enables Fe(III), which cannot activate peroxymonosulfate, to activate peroxymonosulfate efficiently. A trace amount of Cu(II) can reduce Fe(III) to Fe(II).
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高影响因子
Nature Communications
·
2026
·
IF 18.1
Xu Yunyun,Wang Dashuai,Li Yuejiao,Qi Haifeng,Guo Zhuobin,Azam Tasmia,Das Pratteek,Wu Zhong-Shuai,Cheng Hui-Ming
All-solid-state Li–CO 2 batteries are limited by sluggish interfacial CO 2 redox kinetics and the incomplete decomposition of insulating Li 2 CO 3 at rigid solid-solid-gas interfaces. Here, we report an integrated cathode-electrolyte architecture in which copper atomic clusters and single atoms are co-anchored on freestanding N-doped carbon nanotubes and coupled with a succinonitrile/Li 1+x Al y Ge 2-y (PO 4 ) 3 -based solid-state electrolyte. The conformal ion-conducting phase and conductive nanotube scaffold provide coupled pathways for Li + , electrons and CO 2 at the cathode interface. Electronic coupling between the copper atomic clusters and single atoms induces charge transfer from the former to the latter (~0.457 e − ), rendering the Cu cluster sites partially cationic and facilitating the activation of carbonate intermediates. This dual-site configuration changes the discharge pathway and lowers the reaction energy of the rate-determining step to 2.412 eV. The assembled battery delivers a discharge capacity of 21356 mAh g −1 at 200 mA g −1 and operates for 260 cycles (>1000 h) at 500 mA g −1 with an energy efficiency of 78%. This work provides an interfacial design strategy for solid-state Li–CO 2 batteries by coupling continuous transport pathways with electronically regulated dual Cu active sites.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhanbo Wang,Depeng Gong,Zezhen Zhang,Shilong Gao,Chaocan Zhang
First reported liquid-phase synthesis of copper nanorods from a highly concentrated copper precursor under low-alkalinity and low structure-directing agent conditions. • A highly oxidation-resistant conductive ink was prepared by electroless plating and by using an organosilane-modified polyurethane as the continuous phase. • The resulting conductive ink enables stable performance in flexible electronics applications, including motion sensing, physiological monitoring, human-machine interfaces, wireless communication, and electromagnetic interference shielding. Functional conductive inks are foundational to flexible electronics and demand tight control over the oxidation resistance and conductivity of the metallic phase, together with the rheology, mechanical compliance and thermal stability of the continuous phase, to optimise printability and device performance. Morphology control of the conductive phase is also essential; however, scalable, low-cost and environmentally benign syntheses remain challenging. Here reporting a strategy that addresses these barriers. Polyether diamine (ED-2003) serves as a structure-directing agent under low-alkalinity, ice-bath conditions, enabling, for the first time, large-scale copper nanorod production from a high-concentration precursor system. A facile, contamination-free electroless silver-plating step forms Cu@Ag core-shell nanorods with excellent oxidative stability, while functional-group incorporation into the polymer backbone of the continuous phase concurrently improves flexibility, thermal robustness and nanorod dispersibility. The resulting ink delivers ultrahigh conductivity (386,093.33 S cm −1 at 19 wt% solids) and retains 383,192.56 S cm −1 after one year in air. It prints high-resolution, uniform conductive patterns on latex, (polyurethane) PU, cellulose and PET, and the printed films maintain nearly constant conductivity after 10,000 bending cycles, and printed traces are stretchable to 1000%. Collectively, these results highlight the broad applicability of the ink in flexible printed electronic products and establish a new paradigm for the scalable manufacture of high-performance, low-cost printed conductive inks for flexible electronics. Download: Download high-res image (270KB) Download: Download full-size image
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Nanoenergy Advances
·
2026
·Vol. 6
·期 3
·23
·
IF 4.2
Yuping Wu,Hu Fu,Bolin Li,Qinran Zhang,Zhirong Chen,Haichen Li,Hongming Zhou
Poly(ethylene oxide) (PEO)-based solid polymer electrolytes are regarded as highly promising solid electrolyte materials owing to their favorable chain flexibility. However, their practical application is hindered by low room-temperature ionic conductivity and poor mechanical properties. To address these issues, a metal–organic framework (Cu-MOF) with a 2D layered structure and 1D microchannels is introduced into PEO to form a composite solid electrolyte. The results reveal that Cu-MOF can suppress PEO crystallization through steric hindrance and coordination interactions, thereby increasing the fraction of the amorphous phase. Moreover, its unsaturated metal sites can attract TFSI−anions, promoting the dissociation of the sodium salt and enhancing sodium-ion transport. Theoretical calculations and molecular simulations further confirm the regulatory role of Cu-MOF in ion transport. Leveraging this mechanism, the Na3V2(PO4)3/C|PCM-8%|Na cell delivers exceptional electrochemical performance over a wide temperature range. At room temperature, the capacity exhibits virtually no decay after 200 cycles at 0.5 C, and outstanding rate capability is maintained even at a high rate of 4 C. At a temperature of 65 °C, a capacity retention of 91.4% is achieved after 200 cycles at 0.5 C. This study offers a highly promising strategy for the development of wide-temperature-range, high-performance solid-state sodium batteries.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Kaiqiang Yang,Junlei Liu,Wenyan Zhang,Wenying Li,Wei Xu
Flavonoids are important natural bioactive compounds with remarkable health benefits, requiring rapid and accurate detection for food nutrition assessment and quality control. However, it remains challenging to simultaneously discriminate multiple flavonoids in complex matrices. Taking inspiration from the tunable structures of MOF-based nanozymes and the ability of sensor arrays to simultaneously detect multiple substances, we herein propose an innovative four-channel colorimetric sensor array for flavonoid identification. Four copper-based MOF nanozymes (Cu-ImC 2 N, Cu-ImC 2 , Cu-ImCl 2 , Cu-ImPh) were synthesized with different imidazole derivatives as ligands, showing significant differences in their peroxidase-like activities. Exploiting their specific catalytic activity variations at pH 6.0 and 6.5, the two most active nanozymes (Cu-ImC 2 N and Cu-ImC 2 ) were strategically selected to construct the array. Upon processing the array data with linear discriminant analysis (LDA), the array achieved 100% accurate discrimination and quantitative detection of seven flavonoids, with limits of detection (LODs) ranging from 0.039 to 0.982 μM. Furthermore, comparisons of concentration-independent models built with multiple machine learning algorithms showed that the K-nearest neighbors (KNN) method outperformed LDA, effectively reducing interference from concentration variations. The sensor array was successfully applied to the analysis of commercial soy milk, reliably differentiating products from different brands and bean sources (e.g., soybean and mung bean). This strategy surpasses traditional single-analyte methods and holds substantial practical potential for the rapid on-site detection of complex food systems.
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2026
·
IF 5.9
Huaqiang Luo,Bingjie Sun,Guitao Tan,Bingtian Tu,Jing Tu
Core-shell-shell PPH nanospheres were designed for antibiotic-free wound therapy. • Cationic PHMB and released Cu 2+ cooperatively eliminate bacteria and biofilms. • PDA layer regulates pH-responsive Cu 2+ release with favorable hemocompatibility. • PPH promotes HUVEC migration in vitro and neovascularization in vivo . • Accelerated wound remodeling was achieved with enhanced collagen deposition. Bacterial infection and biofilm formation pose major obstacles to wound healing. To address these challenges, we designed a core-shell nanocomposite, Cu-PBG@PDA@PHMB (PPH), consisting of a copper-doped phosphate glass (Cu-PBG) core, a polydopamine (PDA) interlayer, and a polyhexamethylene biguanide (PHMB) outer shell. The PPH nanospheres exert a complementary antibacterial effect via contact-killing and ion release: the cationic PHMB shell disrupts bacterial membranes through electrostatic interaction, whereas the PDA layer mediates pH-responsive Cu 2+ release. This combined effect is primarily driven by substantial contact-induced membrane damage, and the presence of released Cu 2 ⁺ ions further enhances this membrane-disruptive action, ultimately leading to efficient bacterial killing. In vitro evaluations demonstrated that PPH exhibited notable antibacterial activity against Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ), markedly reduced mature biofilm biomass, and substantially disrupted biofilm integrity. Furthermore, the nanocomposite exhibited favorable biocompatibility and significantly promoted endothelial cell migration. In vivo experiments in a S. aureus -infected murine wound model demonstrated that PPH treatment was associated with accelerated wound closure, reduced bacterial burden, and improved angiogenesis and collagen deposition. This nanoplatform represents a promising therapeutic strategy for the clinical management of infected wounds.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Yifei Liu,Defa Liu,Ying Yu,Zumin Wang,Ruziev Umidjon Abdimajitovich,Donaev Sardor Burkhanovich,Semencha Alexander Vyacheslavovich,Lei Wang,Lingbo Zong,Bin Li,Xufang Qian
Fe-Cu dual-atom sites were prepared through pre-coordination and ultrafast Joule heating. • FeCu-N-MCS displays a large E 1/2 , low H 2 O 2 yield and excellent stability. • FeCu-N-MCS suppresses H 2 O 2 accumulation through hydrogen peroxide reduction reaction (HPRR). • Cooperative interaction of dual-atom sites reduces the energy barrier of OH* desorption for 4e⁻ ORR. • Zn-air batteries achieve ultrahigh power density and remarkable charge/discharge stability. The oxygen reduction reaction (ORR) governs the power output and cycling lifetime of metal-air batteries. Fe-N-C single-atom catalysts are among the most promising precious-metal-free ORR electrocatalysts, but their durability is often compromised by H 2 O 2 generated through the competing two-electron ORR pathway, which can trigger Fenton reactions and radical-induced catalyst degradation. Herein, Fe-Cu dual-atom sites anchored on microporous carbon spheres (FeCu-N-MCS) are constructed through a pre-coordination strategy followed by rapid Joule heating. Combined experimental results and density functional theory (DFT) calculations reveal that the electronic coupling between Fe and Cu sites lowers the energy barrier of the rate-determining step for the four-electron ORR pathway. More importantly, the Fe-Cu dual-site configuration enables spontaneous hydrogen peroxide reduction reaction (HPRR) at Fe sites and significantly facilitates OH* desorption during HPRR, thereby suppressing H 2 O 2 accumulation and alleviating Fenton-type oxidative degradation. Consequently, FeCu-N-MCS delivers outstanding ORR performance with a half-wave potential of 0.91 V, a low H 2 O 2 yield below 2.91%, and 91.05% current retention after 100 h. Aqueous Zn-air batteries (A-ZABs) assembled with FeCu-N-MCS achieve a peak power density of 223.73 mW cm −2 and stable cycling for over 1200 h. FeCu-N-MCS-based Quasi-solid-state ZABs (QSS-ZABs) further exhibit an open-circuit voltage (OCV) of 1.52 V and a power density of 246.85 mW cm −2 . This work establishes a dual-atom-site strategy for coupling high ORR activity with H 2 O 2 -resistant durability, offering mechanistic insight into the design of robust precious-metal-free electrocatalysts for advanced metal-air batteries. Download: Download high-res image (220KB) Download: Download full-size image Fe-Cu dual-atom sites were prepared through pre-coordination and Joule heating. The incorporation of Cu sites into Fe-N-MCS not only reduces the energy barrier of the rate-determining step (RDS) to accelerate the 4e⁻ ORR pathway, but also enables spontaneous hydrogen peroxide reduction reaction (HPRR) to suppress H 2 O 2 accumulation and Fenton corrosion. Consequently, the assembled Zn-air batteries achieve remarkable power density and ultra-long cycling stability.
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