JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Jiaqi Xu,Yuanke Zhang,Xiaoguang Zhu,Guixia Ling,Peng Zhang
Heavy metal pollution poses a major threat to human health, and developing a user-deliverable heavy metal detection strategy remains a major challenge. In this work, two-mode Hg 2+ sensing platforms based on the tunable cobalt metal-organic framework (Co-MOF) active site strategy are constructed, including a colorimetric, and an electrochemical assay using a personal glucose meter (PGM) as the terminal device. Specifically, thymine (T), a single, adaptable nucleotide, is chosen to replace typical T-rich DNA aptamers. The catalytic sites of Co-MOF are tuned competitively by the specific binding of T-Hg 2+ -T, and different signal output platforms are developed based on the different enzyme-like activities of Co-MOF. DFT calculations are utilized to analyze the interaction mechanism between T and Co-MOF with defect structure. Notably, the two-mode sensing platforms exhibit outstanding detection performance, with LOD values as low as 0.5 nM (colorimetric) and 3.69 nM (PGM), respectively, superior to recently reported nanozyme-based Hg 2+ sensors. In real samples of tap water and lake water, this approach demonstrates an effective recovery rate and outstanding selectivity . Surprisingly, the method is potentially versatile and, by exchanging out T-Hg 2+ -T, can also detect Ag + . This simple, portable, and user-friendly Hg 2+ detection approach shows plenty of promise for application in the future.
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INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2023
·
IF 2.6
Xianjiao Meng,Zhichun Li,Wenbing Ma
In this study, we have successfully synthesised a novel fluorescent chemosensor TM using rhodamine as the fluorophore and 8-hydroxyquinoline as recognition group through traditional Schiff base preparation methods. The chemical structure of sensor TM was characterised by 1H NMR, 13C NMR and ESI-MS. Sensor TM showed obvious fluorescence enhancement response to Hg2+ ion. The detection limit was 0.05 μM, and the solution colour changed from colourless to pink, making it a promising probe for effective naked-eye detection of Hg2+. The results of Job curve indicated that sensor TM and Hg2+ ion coordinated with each other with a binding stoichiometry of 1:1, and the pH test results showed that sensor TM was only suitable for acidic and neutral conditions.
研究领域:
分析化学
·
环境科学
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 14
·6916-6923
·
IF 3.3
Yanru Huang,Ying Li,Yang Li,Keli Zhong,Lijun Tang
Mercury ion (Hg2+) contamination is very hazardous and harmful to the natural environment and human health. The development of small molecule fluorescent probes for the rapid detection of Hg2+ is of great significance. In the present work, an “AIE + ESIPT” mechanism-based benzothiazole derived fluorescent probe was applied to Hg2+ detection and displayed excellent selectivity, good anti-interference ability, low detection limit (2.85 × 10−9 M), and a large Stokes shift (170 nm) in the DMF/H2O mixture solution with fw = 60% H2O volume fraction. The fluorescence response mechanism, involving the desulfurization reaction of O-(2-(benzo[d]thiazol-2-yl)-6-formyl-4-methylphenyl)dimethylcarbamothioate (probe L) with Hg2+ to release the “AIE + ESIPT” fluorophore, was well established based on the UV-vis, 1H NMR, and HRMS spectral analyses. The practical application evaluation indicates that probe L could be used to precisely determine Hg2+ in live cell imaging, natural water, and seafood samples.
研究领域:
分析化学
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环境科学
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生物医学
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2025
·
IF 6.2
Changsheng Zhang,Shuang Liang,Haijun Liu,Yuxuan Hu,Xinzhong Zhang,Fengjian Luo,Zhengyun Lou,Li Zhou,Mei Yang
Mercury (Hg2+) and thiophanate-methyl (TM) are recognized as widespread pollutants in the environment and food. Here, a novel ratiometric fluorescent sensor has been developed for the detection of Hg2+ and TM using nitrogen-doped carbon dots (N-CDs) and Rhodamine B (RhB). In the presence of Hg2+, the fluorescence quenching of N-CDs was caused by photoinduced electron transfer, while the fluorescence recovery was triggered by the competitive binding of TM and N-CDs to Hg2+. However, the RhB fluorescence in the system was unaffected by Hg2+ and acted as a reference for internal calibration. Under optimized conditions, the sensor displayed a favorable linear dependence on Hg2+ and TM within the concentration ranges of 0.50–50 μM and 0.50–3.0 mg/L, with detection limits of 0.15 μM and 0.017 mg/L, respectively. And the sensor exhibited remarkable selectivity, with insignificant interference from coexisting metal ions or pesticides. This work presents a novel dual-functional ratiometric sensor for cascade detection of Hg2+ and TM in diverse environments, such as water, cucumber, and rice, highlighting its potential in practical applications.
研究领域:
环境化学
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分析化学
·
传感技术
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食品安全
·
纳米材料
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LUMINESCENCE
·
2021
·Vol. 37
·期 2
·220-229
·
IF 2.464
Yalei Liu,Luyao Su,Sui Wang,Zhiyong Guo,Yufang Hu
In this paper, based on the fluorescence of carbon quantum dots (CQDs) quenched by mercury ions (Hg 2+ ) and the nonresponse of Hg 2+ to rhodamine B fluorescence, a dual emission ratio fluorescence sensor was constructed to realize the quantitative detection of Hg 2+ . Under excitation at 365 nm, the fluorescence spectrum showed double emission peaks at 437 nm and 590 nm, corresponding to the fluorescence emissions of CQDs and rhodamine B, respectively. This method quantitatively detected Hg 2+ based on the linear relationship between the ratio of the intensities of the two emission peaks F 437 /F 590 and the concentration of Hg 2+ . The detection range was 10–70 nM, and the limit of detection (S/N = 3) was 3.3 nM. In addition, this method could also realize the qualitative and semiquantitative detection of Hg 2+ according to the fluorescence colour change of the probe under ultraviolet light. After various evaluations, the method could be successfully applied to the quantitative and visual detection of Hg 2+ in tap water, and demonstrated excellent selectivity, anti-interference performance, and repeatability of the method.
研究领域:
分析化学
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环境科学
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材料科学
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MICROCHEMICAL JOURNAL
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2026
·
IF 5.2
Yu-Zhen Wang,Xiao-Yue Kang,Ning-Na Shi,Mao-Zhong Tian,Qi-Liang Pan,Yun-Feng Bai,Langxing Chen
A Fe-MOFs/rGO/Au ternary composite to construct a competitive electrochemical immunosensor for Hg 2+ . • The porous conductive hybrid accelerates mass transfer and provides abundant antibody binding sites. • The established immunosensor exhibits two linear range of 0.05–200 and 250–2500 nM of Hg 2+ . • The established immunosensor displays the specific selectivity and a low LOD of 0.075 nM. • The sensing platform shows the promising potential for environmental heavy metal monitoring. The development of ultrasensitive Hg 2+ detection in water environments is crucial owing to its severe toxicity to ecosystems and human health. In this work, a label-free competitive electrochemical immunosensor was fabricated for the detection of mercury ions (Hg 2+ ) based on a ternary iron-based metal organic framework/reduced graphene oxide/gold nanoparticles (Fe-MOFs/rGO/AuNPs) nanocomposite. The Fe-MOFs/rGO hybrid composite was synthesized via a hydrothermal strategy, which significantly enhanced the conductivity and effective surface area of the electrode interface. Furthermore, L-cysteine-mediated AuNPs were covalently conjugated to the Fe-MOFs/rGO matrix, which not only offered a stable substrate for the immobilization of anti-Hg 2+ antibodies but also accelerated interfacial electron transport. By monitoring the current response through differential pulse voltammetry (DPV), the immunosensor exhibited the two linear ranges of 0.05–200 nM and 250–2500 nM toward Hg 2+ , accompanied by an ultralow detection limit (LOD) of 0.075 nM. Benefiting from the synergistic effect of the ternary nanocomposite as well as the outstanding specificity of antibody-antigen immunorecognition, the developed immunosensor meets the requirement for the safety monitoring Hg 2+ in complex environmental water samples. Download: Download high-res image (152KB) Download: Download full-size image
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Yingbo Zhao,Fanrui Zhou,Kun Liang,Chunhua Wu,Xiaoping Rao,Qian Chen
In this study, a novel imine bond-based covalent triazine framework (CTF) with triazine groups as its backbone, designated as SWFU-CTFs-101 CTFs, was synthesized and utilized for the adsorption of Hg 2+ in an aqueous solution. The quasi-secondary kinetic model and Langmuir model indicate that the capture of Hg 2+ by the SWFU-CTFs-101 is a chemisorption process in a monomolecular layer. The maximum adsorption capacity of the material was determined to be 148.33 mg/g at a solid-liquid ratio of 1 mg/mL, an initial concentration of Hg 2+ of 400 mg/L, a pH of 6.0 and a temperature of 25°C. The adsorption mechanism of SWFU-CTFs-101 was elucidated by integrating experimental results, spectroscopic properties (SEM and XPS, etc.), and density functional theory (DFT) calculations. Notably, the adsorption capacity of SWFU-CTFs-101 in water remained largely stable after four cycles of recycling, indicating its promising potential for future practical applications.
研究领域:
材料科学
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环境科学
·
化学工程
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Hao Wang,Hongyan Zhao,Guangqiang Liu,Cuixia Bi,Zhuo Zhang,Sujuan Feng,Shoubao Zhang,Shengjun Liu,Xiaolong Yin,Xiwen Zhang
A three-dimensional multi-pocket semi-funnel composite anodized aluminum template (AAO) substrate modified with silver nanoparticles (AgNPs@MPSF-AAO) was successfully constructed via two-step anodic oxidation, pore-expanding treatment, magnetron sputtering, and annealing. Using 4-aminophenylthiophenol (4-ATP) as the probe molecule, the substrate with the best SERS performance was prepared with 100-s sputtering followed by 3-h annealing, the detection limit was as low as 10 −14 mol/L, the logarithm of the concentration showed a good linear relationship with the Raman signal, and the enhancement factor was as high as 6.16 × 10 7 , with a relative standard deviation (RSD) of 7.3 %, showing excellent sensitivity and uniformity. The substrate achieved indirect detection of Hg 2+ through the specific reaction of Hg 2+ with the thiol group of 4-ATP, with low detection limit of 10 −9 mol/L. Moreover, the detection of pesticides (e.g., carbaryl and thiram) verified its practical application potential, offering an efficient solution for the rapid detection of trace harmful substances in industrial wastewater and environmental pollutants.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2013
·Vol. 51
·期 21
·4592-4600
·
IF 3.543
Yun Yu,Xinjian Cheng,Huijuan Zhang,Shengli Hu,Xianghong Li,Aiqing Zhang
Detection and the simultaneous removal of mercury ions are of vital importance. In this study, fluorescent monomers, small molecular sensors, were first synthesized using 4-bromo-naphthalic anhydride as precursor. These double bond bearing sensors were then grafted to polystyrene (PS) microspheres through dispersion polymerization. The sensors still retained their detecting ability when they were anchored on the surfaces of PS microspheres. Upon the addition of Hg 2+ ions to the PS microspheres, both the color and the fluorescence intensity changed, which could be employed to detect Hg 2+ ions. The absorption capacity of the two kinds of PS microspheres reached 0.557 mg g −1 and 0.628 mg g −1 respectively. The PS microspheres still remain their fluorescence and absorption even used for five times. These polymeric highly sensitive chemosensors may see their applications in purification of polluted environments. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013 , 51 , 4592–4600
研究领域:
化学
·
环境科学
·
材料科学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Ting Liu,Wenqi Wang,Dan Jian,Jiahao Li,He Ding,Dingrong Yi,Fei Liu,Shouyu Wang
In order to detect Hg 2+ in remote and on-site mode, we design a smartphone based optical fiber fluorescence sensor (SOFFS), which is composed of a semiconductor laser for fluorescence signal excitation, a quantum dot modified fiber probe for Hg 2+ sensing, a smartphone with a filter for fluorescence signal collection, and a fiber coupler for connecting fiber probe, laser and smartphone. With the evanescent wave on the optimized combination tapered fiber probe surface, SOFFS has an ultra-low detection limit of 1 nM and a wide detection range between 1 nM to 1000 nM. Besides, it is handheld with a small size of 79×57×154 mm 3 and inner power supply, and the combination tapered fiber probe can be easily replaced, supporting the remote and on-site applications. Additionally, a smartphone application is designed for automatically quantifying the fluorescence signals for accurate and rapid Hg 2+ detection. Since SOFFS is compact and cost-effective, moreover, it can measure Hg 2+ in fast speed, excellent selectivity, high accuracy and sensitivity, it is a potential tool for remote and on-site applications.
研究领域:
分析化学
·
环境监测
·
生物传感
·
光学传感器
·
微量金属检测
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Xuemei Hu,Siying Che,Haiyan Fu,Yuanbin She
Colorimetric detection of trace Hg 2+ relies primarily on enzymes -catalyzed 3,3’,5,5’-tetramethylbenzidine (TMB) reactions, with two inherent drawbacks: substrate solubilization dependence on organic solvents and enzymes-associated limitations. By virtue of unique structural tunability and ionic properties, ionic liquids (ILs) dual-substitute enzymes and organic solvents, breaking through traditional bottlenecks via electrostatic assistance. Specifically, ILs enhance TMB water solubility efficiently through π-π interaction/charge-assisted hydrogen bond (CAHB) synergy, thus obviating organic solvents; meanwhile, CAHB and electrostatic interactions accelerate TMB-Hg 2+ redox reactions, eliminating exogenous H 2 O 2 and enzymes s and cutting response equilibrium time by ~35 min. Experiments confirmed that vs. CAHB-free blank systems shows a 2.2-fold increase in absorbance. Moreover, the system exhibits robust anti-interference, maintaining high sensitivity and stability across the pH range of 4.0–6.0. The paper-based ILs sensor allows naked-eye, on-site detection of trace Hg 2+ efficiently.
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BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Zongbing Li,Xiangmin Miao,Ke Xing,Xue Peng,Aihua Zhu,Liansheng Ling
A novel electrochemical biosensor for Hg 2+ detection was reported by using DNA-based hybridization chain reaction (HCR) coupled with positively charged [email protected] core-shell nanoparticles ((+) [email protected] CSNPs) amplification. To construct the sensor, capture probe (CP ) was firstly immobilized onto the surface of glass carbon electrode (GCE). In the presence of Hg 2+ , the sandwiched complex can be formed between the immobilized CP on the electrode surface and the detection probe (DP) modified on the gold nanoparticles (AuNPs) based on T-Hg 2+ -T coordination chemistry. The carried DP then opened two ferrocene (Fc) modified hairpin DNA (H 1 and H 2 ) in sequence and propagated the happen of HCR to form a nicked double-helix. Numerous Fc molecules were formed on the neighboring probe and produced an obvious electrochemical signal. Moreover, (+) [email protected] CSNPs were assembly onto such dsDNA polymers as electrochemical signal enhancer. Under optimal conditions, such sensor presents good electrochemical responses for Hg 2+ detection with a detection limit of 3.6 pM. Importantly, the methodology has high selectivity for Hg 2+ detection.
研究领域:
生物传感
·
环境科学
·
分析化学
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