MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 8
·1-12
·
IF 5.3
Huang Xiao-Qing,Wang Mao-Yu,Wang Xiao-Chen,Shi Xin,Li Rui-Wen,Wu Shuang,Li Ying
A surface-imprinted polymer SiO 2 @Eu(DBM) 3 phen/SMIP has been synthesized using enrofloxacin (ENFX) as the template molecule, methacrylic acid as the functional monomer, and the complex Eu(DBM)₃phen as a fluorescent moiety. The structure and the fluorescence sensing properties of SiO₂@Eu(DBM)₃phen/SMIP have been investigated in detail. The resulting material exhibited high selectivity, a low detection limit of 3.07 µM, and a linear working range from 20 to 100 µM for ENFX. The obtained fluorescence probe demonstrates good selectivity and sensitivity toward ENFX and has the potential for significant application in ENFX detection by simplifying procedures and reducing interference from impurities. In addition, the detection mechanism of the fluorescent probe was also discussed. The results indicate that it is feasible to use SiO 2 @Eu(DBM) 3 phen/SMIP for the detection of ENFX as well as its effective adsorption. This study explores the self-assembly of rare-earth complexes on silica via a surface imprinting technique, which provides a new solution for the subsequent development of the surface blotting technique. Graphical
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 8
·1-13
·
IF 5.3
Li Fang,Luo Mingming,Tan Yijun,Liu Ruowei,Xu Longping,Zhao Pei,Wu Zijian
A dual-mode electrochemical and fluorescent sensing platform for the highly sensitive detection of kanamycin (KANA) in milk was constructed, which leveraged the synergistic effects of carbon dots (CDs)-loaded metal–organic frameworks (CDs@Cu/Al-MOF) and Ti 3 C 2 , along with the competitive binding of complementary DNA (cDNA) strands to KANA-specific aptamers. Loading CDs onto Cu/Al-MOF effectively prevented the aggregation of CDs and shielded the fluorescent signals from environmental interference, significantly enhancing signal stability. When a glassy carbon electrode (GCE) functionalized with Ti 3 C 2 and aptamers was immersed in a solution of cDNA-functionalized CDs@Cu/Al-MOF, the aptamers hybridized with the cDNA, anchoring the CDs@Cu/Al-MOF onto the GCE surface. This resulted in enhanced electrochemical signals and weakened fluorescence intensity in the solution. Upon introduction of KANA, the aptamer preferentially bound to KANA and the cDNA/CDs@Cu/Al-MOF detached from the electrode, leading to a decrease in the electrochemical signal and an increase in the fluorescence signal. The developed dual-mode aptasensor enabled highly sensitive detection of KANA within a range of 100 fM-1 μM, with the limit of detection (LOD) as low as 0.5254 fM (electrochemical mode) and 0.4398 fM (fluorescence mode). The dual-mode aptasensor exhibited excellent selectivity, reproducibility, and promising performance in real milk sample analysis. Graphical
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MICROBIAL ECOLOGY
·
2025
·Vol. 88
·期 1
·1-16
·
IF 4
Su Jinzhu,Su YuPing,weng Yuxin,Ayub Gohar,She Chenxing,Xiao Yumei
Glyphosate-based herbicides are among the most widely used agricultural chemicals globally, and their widespread application presents risks to environmental health and aquatic ecosystems. Continuous glyphosate inputs disrupt phytoplankton communities, potentially triggering harmful algal blooms. This study examines the proliferation of microalgal species exposed to low glyphosate concentrations (0.05 mg/L) and various phosphorus sources, with a particular focus on C-P and C-O-P bond phosphonates, which have been insufficiently studied in previous research. We hypothesized that cyanobacteria might exhibit a competitive growth advantage over other algal species when exposed to C-P bond glyphosate, especially under phosphorus-limited conditions. In monoculture experiments, Microcystis aeruginosa and Peridinium umbonatum var. inaequale significantly increased their biomass when cultured with C-P bond phosphonates, whereas Scenedesmus bijuga failed to thrive under similar conditions. Peridinium umbonatum var. inaequale also displayed increased soluble protein content in response to glyphosate stress, indicating an adaptive stress response. In co-culture experiments, M. aeruginosa demonstrated greater tolerance to glyphosate than P. umbonatum var . inaequale , though biomass increases were not significantly correlated with soluble protein or APA. Sediment–water interface experiments revealed that glyphosate exposure significantly promoted cyanobacterial biomass, which was approximately five times greater than that of the inorganic phosphorus group. Notably, when cyanobacterial biomass exceeded 20% of the total, Cyanophyta replaced Chlorophyta as the dominant group, suggesting a potential competitive advantage under low-dose glyphosate exposure. These findings highlight that glyphosate may promote cyanobacterial dominance by altering phytoplankton community composition, potentially contributing to the increased frequency of harmful algal blooms in nutrient-limited aquatic environments.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Zhou Xiao-Xia,Yin Yi-Ting,Zhang Xiao-Yi,Li Shu-Sheng,Jiang Xu-Bao,Zhu Xiao-Li,Kong Xiang-Zheng
Fluorescent polyurea-carbon dots (PU-CD) were successfully achieved through a co-pyrolysis technique, combining polyurea (PU) with carboxyl-containing carbon dots (PCD) at a temperature of 220 °C. The PU was fabricated via a simple precipitation polymerization process using toluene diisocyanate in a water/acetone binary solvent system. PCD was generated by thermal treatment of poly(ethylene glycol) (PEG) at the same elevated temperature. To elucidate the structural characteristics of PU-CD, as well as its precursor components PU and PCD, a comprehensive suite of analytical techniques was employed, including transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), dynamic light scattering (DLS) and X-ray photoelectron spectroscopy (XPS). These analyses confirmed the formation of amide bonds resulting from the reaction between the terminal amines of PU and the carboxyl groups of PCD. An in-depth comparison of the fluorescence properties of PU-CD revealed marked enhancements in fluorescence intensity when contrasted with PU, PEG, and the individual PCD. The research explored the impact of various factors such as concentration, pH in aqueous solutions, and solvent type on the fluorescence emission of these materials, providing valuable insights into their emission mechanisms. It was particularly noteworthy that both PCD and PU-CD exhibited a confined-domain crosslink-enhanced emission effect. Utilizing the aqueous dispersion of PU-CD as a fluorescent probe, the detection of doxycycline (DOX), a long-acting, broad-spectrum, semi-synthetic tetracycline antibiotic, was achieved with a detection limit of 2.9×10 −7 mol/L. This study introduces a simple, green, and cost-effective fluorescent probe for the detection of DOX, which has significant potential for application in the realms of analytical chemistry and food safety monitoring in the future.
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Acta Metallurgica Sinica-English Letters
·
2025
·
IF 3.9
Sun Siyu,Zhu Shaoqiang,Zhang Xiang,Zhao Dongdong,Rong Xudong,He Chunnian,Zhao Naiqin
The rapid expansion of marine industries has created an urgent demand for advanced engineering materials with superior multifunctional performance. While Cu–Ni alloys demonstrate favorable stability and tribological characteristics, their practical applications are constrained by compromised thermal conductivity and insufficient mechanical strength due to the solid solution of a high amount of Ni in the Cu matrix. Cu–Ni matrix composites reinforced with hexagonal boron nitride (h-BN) have garnered significant attention due to their potential for tailored mechanical and thermal properties. However, challenges such as BN agglomerations in Cu–Ni matrix and poor interfacial bonding hinder their practical applications. To address these limitations, this study proposes an innovative fabrication strategy for boron nitride nanosheets (BNNSs) reinforced Cu–Ni composites by integrating the in situ synthesis of BNNSs on Cu powders via chemical vapor deposition with powder metallurgy. Benefited by the in situ strategy, BNNSs with high crystallinity distribute uniformly within the Cu matrix and have an intimate interfacial bonding without voids or other types of defects. Remarkably, the BNNSs/Cu-30%Ni composite achieves simultaneous enhancement in strength and ductility, exhibiting an ultimate tensile strength of 417 MPa and fracture elongation of 17.5%, representing 30% and 118% improvements over pure Cu–Ni alloys, respectively. This exceptional mechanical synergy originates from threefold strengthening mechanisms: grain refinement, mobile dislocation pinning, and efficient stress transfer via robust interfaces. The microstructural analysis confirms that homogenous distribution of BNNSs optimized stress distribution, mitigating strain localization in the composites. Fractographic examination demonstrates uniformly distributed dimples containing embedded BNNSs, indicative of effective crack bridging and deflection during failure. Furthermore, the composite possesses excellent corrosion resistance comparable to matrix alloys, while achieving 21.23% enhancement in thermal conductivity and 20% reduction in coefficient of friction. The scalable fabrication protocol successfully resolves longstanding challenges in BNNSs dispersion and interfacial bonding, offering a viable pathway for designing high-performance CMCs for marine applications.
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WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 10
·1-20
·
IF 3
Hu Wei,Zhang Jun
This study investigated the adsorption characteristics of Cr(VI) and methyl orange (MO) onto polyethyleneimine (PEI) cryogels. The morphology and physicochemical properties of this prepared adsorbent were characterized with various techniques. Its adsorption behaviors towards MO and Cr(VI) were systematically investigated. In single-component systems, PEI cryogels exhibited significant adsorption capacities for Cr(VI) (875 mg/g) and MO (1777 mg/g), respectively. In binary systems, the cryogels demonstrated a stronger affinity for Cr(VI) than for MO. Column adsorption studies in single-component systems explored the effects of bed height, flow rate, and inlet concentration using breakthrough curves, with the modified dose–response model proving effective in describing these curves. Moreover, repeated dynamic adsorption experiments highlighted that the cryogels exhibited exceptional reusability. Results from column adsorption in binary systems indicated that the presence of MO did not significantly affect the adsorption of Cr(VI), while the presence of Cr(VI) enhanced the affinity of the cryogels for MO adsorption. The adsorption mechanism of PEI cryogels towards Cr(VI) primarily involved electrostatic attraction and reduction, whereas for MO, it predominantly entailed electrostatic attraction and hydrogen bonding. These findings collectively emphasize the significant potential of PEI cryogels for treating dyeing wastewater.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 9
·1-16
·
IF 5.3
Meng Jingjing,Han Lu,Li Lu,Yin Xue-bo,Zheng Jing
Manganese dioxide (MnO 2 )-based heterogeneous catalysts have gained significant attention in nanozyme research due to their exceptional oxidase-mimicking capabilities. This work reports the rational design of MnO 2 functionalized magnetic carbon nanotubes (Fe 3 O 4 @C@MnO 2 ) through a multistep synthesis strategy. The magnetic N-doped hollow carbon substrate (Fe 3 O 4 @C) was first synthesized via controlled pyrolysis of FeOOH-coated polydopamine precursors. Subsequent interfacial redox reaction with KMnO 4 enabled the in situ deposition of ultrathin MnO 2 nanosheets on the nanotube substrate, forming a triple-component coaxial architecture. This hollow structure not only facilitates dense MnO 2 deposition but also maintains robust magnetic responsiveness. The obtained Fe 3 O 4 @C@MnO 2 exhibits remarkable enzyme-mimetic capability, catalyzing TMB chromogenic conversion with 0.92-fold enhanced catalytic performance relative to pristine MnO 2 . Systematic mechanistic studies reveal that tannic acid (TA) competitively inhibits ·OH radical generation via MnO 2 -TA complexation, while the carbon interlayer enhances electron transfer efficiency. Owing to the superior enzyme-mimetic performance of Fe 3 O 4 @C@MnO 2 and their inhibition effect by TA, a sensitive colorimetric biosensing assay was fabricated, achieving a TA detection limit of 0.029 μM with a 0.096–4.82 μM linear concentration range. This work exemplifies the synergy of structural engineering and component optimization in designing multifunctional nanozymes, showing potential applications in food quality monitoring, environmental analysis, and point-of-care diagnostics. Graphical
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 9
·1-15
·
IF 5.3
Xue Boyang,Li Qiang,Xing Yanjiao,Mu Hongkai,Yang Yongzhen,Chen Lin,Yu Shiping,Guo Rongrong
To overcome the dual challenges of suboptimal therapeutic outcomes and delayed detection in hepatocellular carcinoma (HCC), a nucleus-targeting theranostic nanoplatform based on gadolinium-functionalized carbon dots (GdCDs) is presented. GdCDs were synthesized via a one-step hydrothermal method utilizing neutral red and citric acid as carbon precursors and gadolinium chloride hexahydrate as the paramagnetic source, showing good fluorescence (FL) and magnetic resonance imaging (MRI) capabilities. After modified with a nuclear localization sequence (NLS), GdCDs were loaded with doxorubicin (DOX) to yield the integrated theranostic platform: Nucleus-targeting gadolinium-functionalized carbon dot drug delivery system (NT-GdCDs-DDS) for FL/MRI dual-modality imaging and nucleus-targeting drug delivery. NT-GdCDs-DDS exhibited optimal excitation/emission wavelengths at 497/596 nm, a high longitudinal relaxivity (r 1 ) of 23.11 mM −1 s −1 , and a DOX loading efficiency of 61.9%. Results of antitumor activity assays in vitro demonstrated the viability of HepG2 cells incubated with 400 μg/mL NT-GdCDs-DDS for 24 h was 8.12%, demonstrating strong antitumor activity. Furthermore, a significant tumor growth suppression in mice was observed by treated with NT-GdCDs-DDS over a 15-day period, showing superiority to free DOX. These findings establish NT-GdCDs-DDS as a potent theranostic nanoplatform for simultaneous HCC imaging and therapy. Graphical abstract
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Water Conservation Science and Engineering
·
2025
·Vol. 10
·期 3
·1-16
·
IF 1.9
Li Zhengjie,Fang Chunxia,Ma Xilong,Liu Yixian,Xie Juan,Li Pengfei,Zhang Zhikun,Zhao Xudong,Sun Hua,Han Jilong
Herein, a facile and rapid preparation method was developed to synthesize Ce-doped UiO-66-NH 2 through a one-pot solvothermal method. This approach simultaneously introduces functional groups onto organic ligands and incorporating a novel metal into metal clusters. The incorporation of Ce ions effectively enlarged the pore size and increased the pore volume, thereby facilitating the diffusion of specific adsorbate molecules into the inner adsorption sites provided by the –NH 2 groups. Due to the favorable pore structures and more exposed adsorption sites, the safranine T (ST) adsorption capacity of Ce-doped UiO-66-NH 2 was ten times higher than the pristine UiO-66-NH 2 and reached 1340 mg/g at optimal adsorption conditions, surpassing most of the reported porous adsorbents. The kinetic and isotherm fitting results showed that the pseudo-second-order and Langmuir models described the adsorption behaviors of ST best, indicating a homogeneous, endothermic, and spontaneous monolayer adsorption process. The adsorption mechanism showed that the hydrogen bonding interaction and pore filling effect are identified as the main mechanism whilst electrostatic attraction interaction further enhances the adsorption capacity at optimal pH. Therefore, Ce-doped UiO-66-NH 2 can serve as a promising adsorbent for the removal of cationic dyes from textile wastewater, and the developed facile and rapid method offers a viable strategy to construct novel MOF-based adsorbents.
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 9
·1-11
·
IF 2.4
Du Yuhao,Hu Dawei,Wang Zhen,Hu Anpeng,Han Wei,Pu Ning
The hydrotreating of residual oil is crucial for producing cleaner fuels, as catalyst deactivation due to metal deposits, particularly nickel (Ni) and vanadium (V), remains a significant challenge. Contrary to the conventional view that metal deposits invariably poison catalysts, our recent studies have observed an unexpected enhancement in the activity of commercial NiMo/Al 2 O 3 catalysts during industrial operation. This study systematically investigates the mechanism behind this counter-intuitive phenomenon, with a particular focus on the effects induced by nickel. X-ray photoelectron spectroscopy (XPS) analysis revealed that low-concentration of Ni deposits preferentially formed highly active NiMoS phases during the reaction process, thereby minimized the formation of NiS x , a typical poisoning species. This increases the number of reactive sulfur sites, boosting the hydrodesulfurization (HDS) activity for 4,6-dimethyldibenzothiophene (4,6-DMDBT), with the conversion rate rising from 17.1 to 73.3%. Similar promoting trends were also observed in conventional NiMo/Al 2 O 3 catalysts upon Ni deposition, demonstrating the generality of this effect. Our findings not only provide new insights into the dual role of Ni deposits in catalyst performance but also offer a promising strategy designing industrial metal-poisoning-resistant catalysts with significantly enhanced operational lifespan as well as catalytic performance.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 24
·1-13
·
IF 2.8
Rafiq Muhammad Nasir,Dai Zhonghua,Zheng Yuanyuan,Li Xujun,Liu Chenxi,Zhao Xin,Cong Yu,Gu Shuitao
The performance of lead-based ceramics in energy storage applications is often hindered by their low energy density and inadequate phase transition properties. The (Pb, La) (Zr, Sn, Ti)O 3 (PLZST) antiferroelectric ceramics have attracted much attention as energy storage materials. In this work, ceramics Pb 1−1.5 x La x (Zr 0.93 Sn 0.05 Ti 0.02 )O 3 at ( x = 0.015, 0.025, 0.035, and 0.045) were prepared using a solid-state method, and their dielectric and energy storage characteristics were studied. It was observed that integrating lanthanum significantly improved the perovskite structure, reducing grain size and boosting the polarization intensity. In this present study, a recoverable energy storage density ( W rec ) of 6.24 J/cm 3 was achieved under an electric field of 270 kV/cm. Moreover, these ceramics demonstrated an impressive discharge energy density ( W dis ), with 90% of the energy released within 1.29 μs. The outcomes show that PLZST is a highly effective material for advanced energy storage, pulse power applications, and paving the way for technological advancements.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 22
·1-12
·
IF 2.8
Liu Gang,Pu Zining,Xu Limeng,Yao Cheng,Zhang Changhai,Zhang Tiandong,Chi Qingguo
Conventional polymer film capacitors suffer from significant performance degradation at high temperatures due to increased conductivity loss. This study aims to enhance the high-temperature energy storage performance of polyetherimide (PEI) films by constructing a PZT/SiO 2 heterojunction composite dielectric structure. PEI films were prepared by solution casting and then modified by magnetron sputtering to deposit PZT and SiO 2 layers. At 150 °C, the composite films exhibited a high breakdown strength of 636.7 MV/m, a discharged energy density of 4.28 J/cm 3 , and a charge–discharge efficiency exceeding 90%. The PZT/SiO 2 heterojunction effectively inhibited charge injection, reducing leakage current and improving cyclic stability with minimal degradation after 50000 charge–discharge cycles. This scalable method offers a promising approach for developing high-performance polymer-based energy storage materials suitable for high-temperature applications.
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