SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Mu-Lan Yao,Si-Lu Wang,Si-Mian Liu,Xiao Wang,Ji-Jiang Wang,Xiang-Yang Hou
This study presents a novel method for simultaneous identification of Hg 2+ , In 3+ , and Zr 4+ ions in solution using a double-emission fluorescence MOFs composite (EY@MOF-1) as a probe. The new pure zinc-based metal-organic framework ({[Zn 3 (TPPO) 2 (1,4-IYI) 2 ]·3H 2 O} n , MOFs-1, Tri( p - carboxyphenyl) phosphorus oxide = H 3 TPPO,1-(4-imidazol-1-ylphenyl)-imidazole = 1,4-iyi, Eosin Y = EY) produces strong single emission fluorescence at 364 nm when excited at 320 nm. Utilizing its unique fluorescent properties, MOFs-1 can effectively identify Hg 2+ , In 3+ , and Zr 4+ ions in solution. However, the fluorescence quenching effect caused by the three ions is identical, making it impossible to accurately determine which metal is the identified ion. To address this issue, a post-modification synthesis strategy was used to construct EY doped dual-emission fluorescent material EY@MOF-1. As expected, EY@MOF-1 can effectively identify and differentiate Hg 2+ , In 3+ , and Zr 4+ ions in solution based on their different fluorescence quenching changes. The probe has a limit of detection of 0.18 μM (Zr4+), 0.20 μM (In3+), and 0.13 μM (Hg2+) within a certain concentration range. The mechanism of fluorescence recognition was investigated in depth. This double emission fluorescence probe, with its high sensitivity and selectivity, is the first of its kind and provides a simple and reliable method for effective identification of Hg 2+ , In 3+ , and Zr 4+ . It has potential applications in environmental monitoring and is a valuable tool for ion identification.
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高影响因子
TALANTA
·
2024
·
IF 5.6
Li Zhang,Xiaoya Bi,Hui Wang,Libo Li,Tianyan You
Ligand-protected gold nanoclusters (AuNCs) have become promising nanomaterials in fluorescence (FL) methods for mercury ions (Hg 2+ ) monitoring, but low FL efficiency hinders their widespread application. Herein, AuNCs/cerium-based metal-organic frameworks (AuNCs/Ce-MOFs) were prepared by loading 6-aza-2-thiothymine-protected AuNCs (ATT-AuNCs) with aggregation-induced emission (AIE) effect on the surface of Ce-MOFs by electrostatic attraction. This strategy improved the FL intensity of AuNCs through two aspects: (i) the AIE effect of ATT-AuNCs and (ii) the confinement effect of Ce-MOFs, which improved the restriction of intramolecular motion (RIM) of ATT-AuNCs. In addition, Ce-MOFs could adsorb and aggregate Hg 2+ during detection, which might increase the local concentration. Therefore, based on the high FL signal of AuNCs/Ce-MOFs and enriched Hg 2+ , sensitive detection of Hg 2+ could be achieved. More importantly, the strong specific recognition between AuNCs and Hg 2+ could guarantee selectivity. The developed FL sensor exhibited superior detection performances with a wide linear range of 0.2–500 ng mL −1 and a low detection limit of 0.067 ng mL −1 . Furthermore, the FL sensor used for sensitive and selective detection of Hg 2+ in real samples, and the results agreed well with the standard method. In summary, this work proposed an effective and generalized strategy for improving the FL efficiency of AuNCs, which would greatly facilitate their application in pollutant monitoring.
研究领域:
材料科学
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环境科学
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分析化学
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SENSORS AND ACTUATORS B-CHEMICAL
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2015
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IF 4.097
Zhengbo Chen,Tianhong Lou,Qian Wu,Kai Li,Lulu Tan,Jingyan Sun
In this contribution, we have developed a rapid method for the highly selective detection of mercury ions (Hg 2+ ) using citrate-stabilized triangular silver nanoplates (AgNPs). The colorimetric sensor strategy is based on the aggregation of Hg 2+ -coated AgNPs with the assistance of two amino groups of lysine, resulting in a color change of AgNP solution from blue to mauve or gray. The sensor enables the analysis of Hg 2+ with a minimum detectable concentration that corresponds to 50 nM. Meanwhile, the strategy offers excellent selectivity toward Hg 2+ against other cations. The validation of this method is carried out by analysis of Hg 2+ in tap water with satisfying recoveries over 91.35–106%.
研究领域:
分析化学
·
环境科学
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Liying Yu,Lingyu Zhang,Guojuan Ren,Shuang Li,Baoya Zhu,Fang Chai,Fengyu Qu,Chungang Wang,Zhongmin Su
In this article, we reported a dual emissive multicolorful fluorescent-nanoprobe which was composed of gold nanocluster (BSA-Au NCs) and carbon dots (CDs) with a certain proportion, i.e. Au NCs-CDs. The dual emissive Au NCs-CDs showed pink fluorescence under UV light, and the dual emission peaks at 625 nm and 444 nm were corresponded to the existence of Hg 2+ and Cr 6+ respectively. The fluorescence color transformed from pink to blue when in presence of Hg 2+ . The blue fluorescence emission of CDs selectively quenched by Cr 6+ , whereas the red fluorescence of BSA-Au NCs was stable against Cr 6+ , which can be treated as internal reference. The difference response of the two emissions to Hg 2+ and Cr 6+ resulted in a distinguished fluorescent color change, which can be noticed by the naked eyes clearly. When the Hg 2+ and Cr 6+ were exposed to the Au NCs-CDs simultaneously, the dual-emission of the Au NCs-CDs were all reduced and exhibited the complete quenching of the pink emission. The detection limits for Hg 2+ and Cr 6+ were 1.85 nM and 5.34 nM, respectively. Significantly, it was successfully applied to determine the existence of Hg 2+ and Cr 6+ in real samples, which offered the advantages of simplicity, environmentally friendly and cost saving efficiency.
研究领域:
分析化学
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纳米生物技术
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环境监测
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毒理学
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分子探针
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环境健康
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2025
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IF 3.7
Yiming Tang,Huicong Zhang,Fashe Li,Hua Wang
In this study, a high-efficiency seaweed-based porous biochar was synthesized via a combined pre-impregnation and template method for effective removal of Hg 2+ from aqueous solutions. The biochar was fabricated by pyrolyzing hydrochloric acid-impregnated seaweed biomass with ZnCl 2 as a template under nitrogen atmosphere. Key preparation parameters, including pyrolysis temperature (500–800 °C), heating rate (5–20 °C·min –1 ), holding time (60–210 min), and biomass–template mass ratio (0.5:1–5:1), were systematically optimized to enhance adsorption performance of biochar. Under optimal conditions (pyrolysis temperature: 600 °C, heating rate: 10 °C·min –1 , holding time: 150 min, biomass–template mass ratio: 3:1), the prepared biochar exhibited a remarkable adsorption efficiency of 87.12% for 200 mg·L –1 Hg 2+ aqueous solution, with an adsorption capacity of 87.12 mg·g –1 . Cl introduced via pre-impregnation and template method facilitated the formation of stable chloromercury complexes ( e.g ., HgCl 2 ). Oxygen-containing functional groups ( e.g ., –COOH) on the biochar surface promoted Hg 2+ adsorption through coordination bonding and electrostatic interactions. Notably, the ZnCl 2 templating method significantly enhanced the biochar’s specific surface area, creating abundant pore structure for Hg 2+ adsorption. The collaborative pre-impregnation and template strategy significantly simplifies the preparation and modification process of biochar. In addition, it provides a new method for chlorine enrichment and pore structure optimization of biochar, thus achieving breakthroughs in adsorption efficiency, capacity, and process simplification of Hg 2+ removal.
研究领域:
环境科学
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材料科学
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吸附技术
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污染控制
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 8
·1-11
·
IF 5.7
Zhang Ziyi,Liu Dan,Zhang Xiaoshuo,Luo Xueli,Lin Wanmei,Li Zhonghong,Huang Jihong
Novel methods for high-performance detection of Hg 2+ in seafood are critical for ensuring food safety and human health. Herein, Ag nanoparticles (Ag NPs) were successfully deposited on carbon microspheres (CMs) to form Ag NPs-CMs nanocomplex. The proposed Ag NPs-CMs could oxidize colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxidation state TMB (oxTMB) in the presence of hydrogen peroxide (H 2 O 2 ) and had a significant UV–vis absorption peak at 652 nm. The excellent peroxidase-like activity was attributed to the increased electrostatic attraction of CMs and the catalytic synergistic effect. After adding Hg 2+ , the catalytic activity of Ag NPs-CMs was specifically enhanced and the Michaelis–Menten constant ( K m ) decreased from 0.067 to 0.052 mmol/L due to the formation of Ag-Hg amalgam which produced more superoxide anions (O 2 •− ) and hydroxyl radicals (•OH). The linear response ranges for Hg 2+ were 2~833 nmol/L and 2.5~40 μmol/L, with the low detection limit of 1.10 nmol/L. This method was applied to detect Hg 2+ in seafood with satisfactory recoveries of 95.65~106.56%. A hydrogel kit was designed for portable detection of Hg 2+ , and the response range was 0.5~5 μmol/L. This work provides a reliable method for visual Hg 2+ detection in seafood as well as a feasible strategy for the design of high-performance nanozymes. Graphical
研究领域:
纳米技术
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环境监测
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食品安全
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生物传感器
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催化
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Jiang-Kuan Chen,Shu-Min Zhao,Jian Zhu,Jian-Jun Li,Jun-Wu Zhao
Herein, we propose a selective and simple colorimetric sensing approach for the determination of Hg 2+ ions based on bimetallic AuAg nanocages with partial hollow cavity and several pinholes on the wall, wherein the residual Ag atoms existing inside this AuAg nanocages can be directly etched by Hg 2+ and the generated Hg depositing on inner surface of nanocages induces the morphology transformation from hollow AuAg nanocages to closed nanoboxes which consists of an AuAg shell and Hg core. This morphology transformation of “nanocage-to-nanobox” not only extends the detection range of Hg 2+ , but also cleans the Hg 2+ in solutions by enriching it into the nanoboxes. With increasing Hg 2+ concentrations, the blue shift of localized surface plasmon resonance (LSPR) peak position with multicolor changing from light-blue to light-brown is great for colorimetric determination of Hg 2+ . Under optimal conditions, the colorimetric sensing shows a linear response to Hg 2+ ranging from 0.03 to 35 μM with a detection limit of 10 nM. Besides, interference study and real samples detection applying lake and tap water demonstrated that Hg 2+ can be specifically and practically detected by utilizing this method.
研究领域:
分析化学
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环境科学
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Dan Wang,Liudan Wei,Jiaxin Tan,Yiyu Yan,Min Wei,Tianyu Song,Sihang Li,Liu Zhao,Weibo Wu,Zhipeng Li,Qingyou Liu
At present, few genetically encoded fluorescent probes are currently available for the analysis of toxic heavy metal ions , and most have poor performance that cannot meet the requirements of sensitive and dynamic detection in living cells. In this study, we designed a single fluorescent protein-based probe sfGFP-MerBD, which can specifically response to Hg 2+ with high binding affinity and wide dynamic range. More importantly, the developing probe can timely and reversibly monitor changes of Hg 2+ concentration in living mammalian cells . The excellent performance of this probe is largely due to the recognition element of the probe, MerBD, which adopts an unusual planar trigonometric coordination configuration with Hg 2+ , and the coordination can cause enough conformational change to influence the fluorescence of skeleton protein sfGFP coupled with it. The small peptide MerBD was delicately designed based on the three-dimensional structure of metalloprotein MerR. This novel design strategy solves the challenging problems that there are few natural functional proteins in the process of constructing fluorescent probes for toxic metal ions and some functional proteins cannot be directly used as recognition elements. Based on the new strategy, more genetically encoded fluorescent probes of toxic heavy metal ions can be efficiently constructed and applied in the future.
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高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Xiao-Ying Liu,Zi-Lin Zhao,Ting-Ting Hao,Xing Li
Mercury is one of the most potentially toxic metals, which is much harmful to the human health. Therefore, It is great important to detect mercury ions . In this work, proposed was a simply visual and rapidly colorimetric strategy for detection of Hg 2+ based on gold nanoparticles (AuNPs) modified with sulfadiazine (SDZ) and characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray powder diffraction (XRD), UV–vis. The solution color from red to blue gray with increasing Hg 2+ concentration resulted from the aggregation of AuNPs with fine anti-interference. The limit of detection (LOD) is 1.0 μg·mL -1 by the naked eye, and 0.071 μg·mL -1 by UV–vis spectroscopy with the good linear relationship (R 2 = 0.994) indicating that AuNPs modified with sulfadiazine could be used for the quantitative determination of Hg 2+ . The selectivity of SDZ-AuNPs detection system for Hg 2+ is much more excellent compared with other interferents in cosmetics, which exhibit this sensor could be successfully applied to detect Hg 2+ in real samples.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Xiaorong Zhao,Qiulan Li,Hong Li,Yijie Wang,Feijian Xiao,Dezhi Yang,Qinghai Xia,Yaling Yang
In this work, cerium-doped carbon dots (Ce-CDs) both as a reducing agent and template hybrid gold nanoparticles (AuNPs) with weak oxidase-like (OXD) activity was synthesized for the detection of Hg 2+ and aflatoxin B 1 (AFB 1 ). The AuNPs can catalyze efficiently mercury ion (Hg 2+ ) reduction to the metallic (Hg 0 ) to form Au-Hg amalgam (Au@HgNPs). The obtained Au@HgNPs with strong OXD-like activity oxidize without Raman-active leucomalachite green (LMG) into the Raman-active malachite green (MG) and simultaneously as the SERS substrates by the formed Raman “hot spot” through MG-induced Au@HgNPs aggregation. While AFB 1 was introduced resulting in the SERS intensity decreasing due to Hg 2+ with AFB 1 via carbonyl group to inhibit the aggregation of Au@HgNPs. The work paves a new path for the design of a nanozyme-based SERS protocol for tracing Hg 2+ and AFB 1 residues in foodstuff analysis.
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高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Lin Yuan,Lei Jiang,Ze Liu,Yingying Xiang,Fei Song,Yujiao Tu
Tartrazine preferred in food and textile industries, but excessive consumption threats human health. Due to toxicity, non-biodegradability, and trace accumulation in the food chains, Hg 2+ has attracted people's attention. Thus, it is important to detect tartrazine and Hg 2+ with sensitivity way. Using VB 2 and citrate as precursors, yellow-green fluorescent carbon dots were prepared by hydrothermal method . The N-CDs were purified by dialysis, thin layer chromatography and chromatographic column. Excellent linear ranges of 0.25–5 μM and 5–50 μM of tartrazine were obtained with low detection limits 34.98 nM, while good linear ranges of 0.25–5 μM and 10–50 μM of Hg 2+ with low detection limits 29.64 nM, respectively. In addition, the quenching mechanisms of targets to the fluorescent of N-CDs were illuminated. Furthermore, the nanoprobe was efficiently applied to determine the content of tartrazine in carbonated drink, fruit jelly and sugar samples, and Hg 2+ in tap water, lake water, and river water samples. It showed great potential to detect tartrazine and Hg 2+ .
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 11
·6326
·
IF 6.208
Ting Sun,Xian Li,Xiaochuan Jin,Ziyi Wu,Xiachao Chen,Jieqiong Qiu
Graphene oxide is well known for its excellent fluorescence quenching ability. In this study, positively charged graphene oxide (pGO25000) was developed as a fluorescence quencher that is water-soluble and synthesized by grafting polyetherimide onto graphene oxide nanosheets by a carbodiimide reaction. Compared to graphene oxide, the fluorescence quenching ability of pGO25000 is significantly improved by the increase in the affinity between pGO25000 and the DNA strand, which is introduced by the additional electrostatic interaction. The FAM-labeled single-stranded DNA probe can be almost completely quenched at concentrations of pGO25000 as low as 0.1 μg/mL. A simple and novel FAM-labeled single-stranded DNA sensor was designed for Hg2+detection to take advantage of exonuclease I-triggered single-stranded DNA hydrolysis, and pGO25000 acted as a fluorescence quencher. The FAM-labeled single-stranded DNA probe is present as a hairpin structure by the formation of T–Hg2+–T when Hg2+is present, and no fluorescence is observed. It is digested by exonuclease I without Hg2+, and fluorescence is recovered. The fluorescence intensity of the proposed biosensor was positively correlated with the Hg2+concentration in the range of 0–250 nM (R2= 0.9955), with a seasonable limit of detection (3σ) cal. 3.93 nM. It was successfully applied to real samples of pond water for Hg2+detection, obtaining a recovery rate from 99.6% to 101.1%.Keywords:positively charged graphene oxide (pGO);exonuclease I;fluorescence quencher;hairpin structure;T–Hg2+–T
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