ANALYTICA CHIMICA ACTA
·
2012
·
IF 4.555
Jiying Pei,Hui Zhu,Xiaolei Wang,Hanchang Zhang,Xiurong Yang
High-quality cysteamine-coated CdTe quantum dots (CA-CdTe QDs) were successfully synthesized in aqueous phase by a facile one-pot method. Through hydroxylamine hydrochloride-promoted kinetic growth strategy, water-soluble CA-CdTe QDs could be obtained conveniently in a conical flask by a stepwise addition of raw materials. The photoluminescence quantum yield (PL QY) of the obtained QDs reached 9.2% at the emission peak of 520 nm. The optical property and the morphology of the QDs were characterized by UV–vis absorption spectra, photoluminescence spectra (PL) and transmission electron microscopy (TEM) respectively. Furthermore, the fluorescence of the resultant QDs was quenched by copper (II) (Cu 2+ ) and mercury (II) (Hg 2+ ) meanwhile. It is worthy of note that to separately detect Hg 2+ , cyanide ion could be used to eliminate the interference of Cu 2+ . Under the optimal conditions, the response was linearly proportional to the logarithm of Hg 2+ concentration over the range of 0.08–3.33 μM with a limit of detection (LOD) of 0.07 μM.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2022
·
IF 7.129
Dandan Kong,Xinyue Li,Yang Tang,Ming Sui,Jinping Li,Yonggui Ma,Gaofeng Wang,Wei Gu,Xuegang Guo,Meihua Yang
Environmental pollution and medicine safety have aroused increasing public concerns due to human health. Amongst various contaminants, mercury is of special attention owing to their environmental persistence and biogeochemical recycling and ecological risks. Herein, a simple and highly parallel electrochemical biosensor for Hg determination was designed and investigated. The proposed biosensor was prepared and compared between (1) DTT/MB-DNA/Au with configuration occupation approach and (2) MCH/MB-DNA/Au with passivation approach. According to the combined results of scanning electrochemical microscope (SECM) and Randles-Sevcik equation, the DTT modified electrode exhibited high uniformity on DNA distribution and superb stability on electron transfer in Hg 2+ detection. Evidentially, the response value of proposed DTT/MB-DNA/Au was increased from 57.518% to 97.607%, while RSD% between duplicate runs had dropped from 22.658% to 0.223% (n = 3). Moreover, the increased proportion of effective working area was 467.380% compared with general sensors. Besides, DTT concentration, DNA concentration as well as assembly time were optimized, utilizing electrochemical impedance spectroscopy (EIS), Cyclic Voltammetry (CV) and Square Wave Anode Stripping Voltammetry (SWASV). This optimized biosensor exhibited an excellent selectivity toward Hg 2+ over Cu 2+ , As 2+ , Cd 2+ , Pb 2+ , Cr 3+ , Ni 2+ and Zn 2+ etc., and the stability of DTT/MB-DNA/Au were at least two times better even after 3 days under room temperature. Also, a linear relation was observed between the peak current and Hg 2+ concentrations in a range from 0.25 nM to 2.00 μM with a detection limit of 53.00 pM under optimal conditions. Finally, DTT/MB-DNA/Au was applied for plants and medical products analysis. In all, this optimized DTT/MB-DNA/Au with advantages of high repeatability and sensitivity would provide a new insight into the design and application of biosensor for reliable sensing in safeguarding plant protection and medicinal safety.
研究领域:
环境科学
·
生物传感技术
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2017
·
IF 3.034
Jingrong Zhou,Yunfei Tian,Xi Wu,Xiandeng Hou
Photochemical vapor generation (PCVG) is a green and effective sampling technology for analytical atomic spectrometry , and in recent years it has been received continuous attention. In this work, visible light photochemical vapor generation was achieved with metal-free g-C 3 N 4 /CQDs (carbon nitride/carbon quantum dots) composites as a photocatalyst, and used for selective and ultrasensitive detection of total mercury by inductively coupled plasma mass spectrometry (ICP-MS). The limit of detection can be as low as 8 ng L − 1 , making it one of the most sensitive methods for mercury determination . The visible light photochemical vapor generation can also be coupled to other analytical atomic spectrometric techniques.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xing Chen,Ji-Xing Zhao,Jia-Wei Wang,Yao Liu,Lian-Chao Wang,Rohan Weerasooriya,Yu-Cheng Wu
Development of robust methods for rapid detection of heavy metal ions and associated chemical species in water is challenging. Different mercury species are ubiquitous in the environment; they bio-amplify and undergo methylation into organo-Hg species. We developed a new electrochemical method for rapid screening of free Hg 2+ in water by square wave anodic stripping voltammetry (SWASV) on a metal-organic framework (MOF) platform using ZIF-67 as starting substrate. Bimetallic MOF structures were fabricated by doping iron, manganese or nickel ions into ZIF-67 using a facile NaOH treatment. The GCE was modified with Ni, Mn, or Fe doped ZIF-67 nanocomposites to enhance performance for Hg 2+ detection. When compared to pure ZIF-67/GCE, the Hg 2+ detection sensitivity by the metal ions-doped ZIF-67/GCE was increased by 260%. The detection limit was improved by 60%. The Fe doping on ZIF-67 (Fe x Co y ) significantly improves electroanalytical performance due to the formation of iron oxide on ZIF-67. The GCE modified with Fe 1 Co 1 nanocomposite showed the best performance for electrochemical detection of Hg 2+ . Besides, the cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS) data also confirmed that Fe doping of the ZIF-67 enhanced the electron transfer rate at the solid-liquid interface. Hg 2+ detection and quantification at this new chemically modified sensing electrode were not interfered by Cd 2+ , Pb 2+ , and Cu 2+ . The Fe 1 Co 1 modified GCE is stable when used repeatedly for ten cycles. The spike recovery of 0.3 to 1.00 µM Hg 2+ with Fe 1 Co 1 modified GCE was always above 99.0%. The chemically modified sensor with Fe 1 Co 1 holds a promise in monitoring Hg 2+ at trace concentrations.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL SCIENCES
·
2015
·Vol. 31
·期 2
·113-118
·
IF 1.394
Guoyan LIU,Huipeng REN,Yuyu GUAN,Ronghua DAI,Chunyan CHAI
A fast and simple mercury detection kit was developed based on melamine-functionalized gold nanoparticles (GNPs). The detection kit contained reagent 1 (GNPs), reagent 2 (melanine), a reaction cuvette with four separated cells, a colorimetric card and a plastic pipette. The GNPs were prepared by a citrate reduction of HAuCl4. A proper amount of melamine was applied to functionalize the GNPs. The complex reaction took place in the present of Hg2+ in the test samples, leading to the combination of Hg2+ with the C=N group of melamine located on the surface of the GNPs. This reaction resulted in damage to the stability of colloid gold, and the aggregation of GNPs occurred. Different color changes (from claret-red to lilac, purple and plum) were displayed with different concentrations of Hg2+ in the test samples. It was very easy and convenient to determine the amount of mercury ion by the naked eye. The advantages of this methodology are listed as follows: a short detecting time (within 10 min), a high specificity (no significant interference was indicated upon adding a certain amount of Cu2+, Pb2+, Zn2+, Mg2+, Cd2+ and Fe2+), high sensitivity with a detection limit of 0.01 mg L−1 , easy operation and practical on-site use.
研究领域:
环境科学
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL SCIENCES
·
2011
·Vol. 27
·期 12
·1237-1237
·
IF 1.465
Xiangheng NIU,Hongli ZHAO,Minbo LAN
Integrating the advantages of screen printing technology with the encouraging electroanalytical characteristic of metallic bismuth, we developed an ultrasensitive and disposable screen-printed bismuth electrode (SPBE) modified with multi-walled carbon nanotubes (MWCNTs) for electrochemical stripping measurements. Metallic bismuth powders and MWCNTs were homogeneously mixed with graphite-carbon ink to mass-prepare screen-printed bismuth electrode doped with multi-walled carbon nanotubes (SPBE/MWCNT). The electroanalytical performance of the prepared SPBE/MWCNT was intensively evaluated by measuring trace Hg(II) with square-wave anodic stripping voltammetry (SWASV). The results indicated that the SPBE modified with 2 wt% MWCNTs could offer a more sensitive response to trace Hg(II) than the bare SPBE. The stripping current obtained at SPBE/MWCNT was linear with Hg(II) concentration in the range from 0.2 to 40 μg/L (R2 = 0.9976), with a detection limit of 0.09 μg/L (S/N = 3) under 180 s accumulation. The proposed “mercury-free” electrode, with extremely simple preparation and ultrahigh sensitivity, holds wide application prospects in both environmental and industrial monitoring.
研究领域:
分析化学
·
环境监测
·
电化学传感器
·
材料科学
·
工业检测
✓ 已验证
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Ming Li,Panpan Zhang,Jianwei Mao,Jianfeng Li,Dongqing Wang,Bo Xu,Jin Zhou,Jinghong Zhang,Qianyong Cao,Yuling Zhang,Huining Xiao
The nitrogen and boron co-doped carbon dots (N, B-CDs), synthesized via a hydrothermal method, were specifically designed for the detection of mercury and subsequently encapsulated within a three-dimensional (3D) porous aerogel matrix. The resulting aerogels displayed an exceptional adsorptive capacity for heavy metals, achieving a maximum adsorption capacity of 319.49 mg/g for Hg (II) and 263.16 mg/g for Cd (II). Notably, the aerogel provided a rapid response to Hg (II) at extremely low concentrations of 3.5 μM within a mere 15 min. Furthermore, the study highlighted the aerogel's sustainability by assessing its potential for regeneration and subsequent resource utilization. Remarkably, after five cycles of regeneration, the aerogel maintained up to 75 % of its original adsorption capacity. Additionally, the Cd (II)-adsorbing adsorbent was repurposed through sulfurization treatment for the catalytic degradation of methylene blue (MB), achieving a high degradation efficiency of 95 %. This integrated approach not only provides an effective strategy for managing heavy metal contamination in wastewater but also contributes to the goal of resource recovery and sustainable material use.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ming Li,Siqi Zhang,Panpan Zhang,Kexin Qin,Bo Xu,Jin Zhou,Chungang Yuan,Qianyong Cao,Huining Xiao
A new cellulose-based material as adsorbent was prepared for Hg (II) detection and removal from aqueous solution. Rhodamine moiety was conjugated with cellulose as an efficient sensor, enabling the material to exhibit excellent optical signals on the contact with Hg (II). Fourier transform infrared spectra, elemental analysis, thermogravimetry, differential thermal analysis, scanning electron microscope analysis, Brunauer-Emmett-Teller surface area, pore volume and pore size were employed to verify the modification of cellulose. A 7-fold enhancement of fluorescence intensity afforded the adsorbent “off–on” fluorimetric response exclusively towards Hg (II) without the interference of more than ten other kinds of metal ions. The detection limit reached as low as 9.18 × 10 -7 M. Besides, the adsorbent also showed an obvious color change during the adsorption to realize “naked-eye” recognition with Hg (II) in the range of 1–400 ppm. Thus, a colorimetric card was prepared to evaluate the concentration of Hg (II) in a convenient and rapid manner. In addition, the adsorption properties of the material including the effect of initial concentration, pH, and contact time were systematically investigated by batch adsorptions. The adsorption process was found to fit well with Langmuir adsorption model and pseudo-second-order kinetics. The mercury triggered spirolactam ring-opening reaction was responsible for the sensitive and selective fluormetric sensing and confirmed by the Job’s plot (1:1 binding stoichiometry) and X-ray photoelectron spectroscopy. Furthermore, density functional theory studies also indicated the energetically favorable Hg (II) induced ring-opening process. The highly sensitive and selective performance in tap water further demonstrated the tremendous potential of as-prepared adsorbent for practical application.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yang Mei,Chenxi Li,Si Yang,Wenliang Chen,Rong Liu,Kexin Xu
Since mercury is one of the most toxic heavy metals in water, its detection is critical for environmental protection. Various biosensors based on T-Hg 2+ -T sensing strategies have been developed; however, their mechanisms are highly dependent on the buffer conditions and are not suitable for the rapid high-throughput analysis of many complex water samples. In this work, a self-assembled biosensor for the high-throughput detection of Hg 2+ based on a cleavable PS-RNA-modified probe and homogeneous photochemical chemiluminescence assay was developed. In the presence of Hg 2+ , the probe was cleaved, and the singlet oxygen channel was destroyed, which decreased the fluorescence signal. This biosensor is highly selective for Hg 2+ , with a limit of detection of 1.4 nM (S/N = 3) in a linear range of 5 nM - 5 μM (R 2 = 0.991). The recoveries of standard addition methods in different water samples indicate that this feasible, simple method is a promising tool to monitor mercury ions in environmental applications.
研究领域:
环境科学
·
分析化学
·
生物技术
✓ 已验证
DOI
高影响因子
JOURNAL OF BIOSCIENCE AND BIOENGINEERING
·
2019
·
IF 2.032
Dan Wang,Yanan Zheng,Xiaosu Fan,Lina Xu,Ting Pang,Ting Liu,Legui Liang,Shan Huang,Qi Xiao
Mercury pollution has always been a huge threat to human health due to its significant toxicity. Thus, it's the continuing goal to obtain new mercury detection techniques that are cost-effective, operational stable, performance efficient, and applicable to the environmental and biological milieus. In this research, the soluble pigment pyocyanin with anti-bacterial and anti-fungal activities, the biosynthesis pathway of which was engineered under the regulation of Hg 2+ -dependent transcriptional activator MerR, was firstly used as the visual detection signal in the whole-cell biosensor. The engineered biosensor displayed optical sensing window and a good linearity for Hg 2+ in the range of 25–1000 nM, and the detection limit could reach as low as 10 nM. It permitted on-site detection of bioavailable Hg 2+ with extraordinary selectivity and could resist the interferences of extra metal ions. What's more, the developed biosensor performed function well in a wide pH range (pH 4–10) as well as the environmental water. By fully imitating and utilizing the biosystems from nature, the engineered colorimetric biosensor has great economic and performance advantages over most chemosensors as well as whole-cell biosensors in the practical application of detecting Hg 2+ in the contaminated aquatic systems.
研究领域:
环境科学
·
微生物学
·
生物技术
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 41
·9856-9863
·
IF 5.066
Jun Yao,Xin Gou
In this paper, we report a green, ultrafast and facile aqueous preparation of highly luminescent core–shell CdTe/CdS with significant stability under atmospheric pressure. The surface topography, size, physical shape as well as crystalline structures were studied fully and in depth by adopting a variety of analytical methods such as transmission electron microscopy (TEM) and X-ray diffraction (XRD). The possible mechanism involved in the core growth was proposed and the relevant processes were conjectured too. In this study, we presented a convenient label-free fluorescence nanosensor for the rapid determination of trace mercury, which exhibited many advantages, such as a high sensitivity, excellent selectivity, a rapid response time, a wide linear range and a low limit of detection (LOD). The LOD is down to 1.7 × 10−9 mol L−1, which is lower than that of most other detection methods for mercury.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Xu-Qin Ran,Hai-Long Qian,Xiu-Ping Yan
Grafting specific recognition moieties onto solid-state nanofluidic channels is a promising way for selective and sensitive sensing of analytes. However, the time-consuming interaction between recognition moieties and analytes is the main hindrance to the application of nanofluidic channel-based sensors in rapid detection. Here, we show the integration of ordered two-dimensional covalent organic frameworks (2D COFs) to solid-state nanofluidic channels to achieve rapid, selective, and sensitive detection of contaminants. As a proof of concept, a thiourea-linked 2D COF (JNU-3) as the recognition unit is covalently bonded on the stable artificial anodic aluminum oxide nanochannels (AAO) to fabricate a JNU-3@AAO-based nanofluidic sensor. The rapid and selective interaction of Hg(II) with the highly ordered channels of JNU-3 allows the JNU-3@AAO-based nanofluidic sensor to realize ultrafast and precise determination of Hg(II) (90 s) with a low limit of detection (3.28 fg mL–1), wide linear range (0.01–100 pg mL–1), and good precision (relative standard deviation of 3.8% for 11 replicate determination of 10 pg mL–1). The developed method was successfully applied to the determination of mercury in a certified reference material A072301c (rice powder), real water, and rice samples with recoveries of 90.4–99.8%. This work reveals the great potential of 2D COFs-modified solid-state nanofluidic channels as a sensor for the rapid and precise detection of contaminants in complicated samples.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）