RSC Advances
·
2014
·Vol. 4
·期 70
·37342-37348
·
IF 3.708
Juying Hou,Jianliang Li,Jianchao Sun,Shiyun Ai,Minglin Wang
In this paper, hair, which is composed of 99% keratin and 1% other elements, is chosen as a carbon source for nitrogen-doped carbon nanomaterials. By hydrothermal treatment of hair in water without any additives, such as salts, acids, or bases, carbon nanospheres with a photoluminescent quantum yield of 24.8% have been prepared. When the excitation wavelength changes from 300 to 480 nm, the photoluminescent peak shifts from 422 (violet) to 520 nm (green). Fourier transform infrared and X-ray photoelectron spectroscopy spectra analysis shows the carbon nanospheres are functionalized with hydroxyl, amino, carbonyl, and carboxylic acid groups. The carbon nanospheres have been further used as a novel probe for label-free detection of Hg2+ ions. The method possesses high sensitivity and selectivity. The linear range for Hg2+ ions is 10 to 100 nM. Meanwhile, the detection can be easily accomplished with a one-step rapid operation. This sensing system has been successfully used for the analysis of river water samples.
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Meiling Wang,Guowen Meng,Qing Huang
A prototype of environmentally friendly and low-cost fluorescence sensor, consisting of spinach-extracted chlorophyll- a modified alkali-treated peanut shell (denoted as chlorophyll- a @peanut shell), is achieved and used for trace detection of Hg 2+ in aqueous solutions through fluorescence quenching method. The chlorophyll- a @peanut shell exhibits a linear dynamic detection range from 0 to 19 × 10 −8 M for Hg 2+ with a detection lower limit of 8.5 × 10 −9 M. The feasibility of sensitive and selective detection of Hg 2+ using the chlorophyll- a @peanut shell is also demonstrated in the test of Hg 2+ in synthetic polluted lake waters, showing excellent anti-interference ability to common impurities like silt and alga. Further experiments demonstrate that the improved sensing property of the chlorophyll- a @peanut shell for Hg 2+ than that of chlorophyll- a in solution is ascribed to the selective Hg 2+ adsorption of the alkali-treated peanut shell, which might also be used for the remediation of Hg 2+ in polluted waters. The design concept using non-toxic plants may open a new door to the environmentally friendly and low-cost materials for detection and remediation of environmental pollutants .
研究领域:
环境科学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2022
·
IF 5.895
Chang Liu,Yuye Li,Ting Chen,Shuyun Meng,Dong Liu,Daming Dong,Tianyan You
Efficient preconcentration is critical for sensitive and selective electrochemical detection of metal ions, but rapid specific enrichment with depressed absorption of interfering ions at the electrode is challenging. Here, we proposed an electric field-induced specific preconcentration to boost the analytical performance of DNA-based electrochemical sensors for Hg2+ detection. As for such preconcentration, a positive external electric field was first used to enrich Hg2+ at an electrode assembled with T-rich DNA, thus boosting T–Hg2+–T recognitions. The following applied inverse electric field strips the nonspecifically absorbed Hg2+ and other interfering ions, thus depressing matrix interferences via self-cleaning. Based on this principle, we designed a portable device to realize programmable control of electric fields; a T–Hg2+–T recognition-based electrochemical sensor was thus fabricated as a model platform to assess the feasibility of electric field-induced preconcentration. The experimental results revealed that such a strategy decreased the time of T–Hg2+–T-based recognition from 60 to 20 min and led to detection with better reproducibility by depressing the influence of free Hg2+ as well as interfering ions. This strategy offered Hg2+ detection limits of 0.01 pM─three-fold better than that without preconcentration─within 22 min. The proposed preconcentration strategy offers a new way to enhance the analytical performance of sensing at the solid–liquid interface.
研究领域:
分析化学
·
环境科学
·
生物传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2021
·
IF 6.057
Selvaraj Muthusamy,Long Zhao,Kanagaraj Rajalakshmi,Dongwei Zhu,Shengjun Wang,John Mack,Kang-Bong Lee,Long Zhang,Weihua Zhu
This work describes (Z)-N-((Z)-2-(1,3,3-trimethylindolin-2ylidene)ethylidene)quinoline-8-amine (LYSO-QF), a high-performing and biocompatible dye comprised of quinoline and Fisher aldehyde moieties linked via an imine vinyl backbone with lysosome targeting ability that can be used to quantitatively detect the mercury ion (Hg 2+ ) in biosystems and the natural environment. This is achieved by forming three different tetrameric, trimeric and dimeric complexes between Hg 2+ and LYSO-QF with the limit of detection (LOD) of 11 nm. The complexes formed were analyzed with the aid of time-dependent density functional theory (TD-DFT) calculations. The concentration dependence of the Hg 2+ complex fluorescence emission changes from grey-green to jade green and then to red as the different types of complex are formed. The favorable sensor properties of the LYSO-QF probe are demonstrated by monitoring different Hg 2+ concentrations in buffer solutions, HeLa cells, zebrafish model samples and several different types of water sample. Experiments with Whatman paper strips demonstrate that the cost-effective LYSO-QF also has considerable potential for use in on-site Hg 2+ detection with the naked eye.
研究领域:
生物化学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2014
·
IF 0.7
Yue XU,Chun-Jing TANG,Hong HUANG,Chao-Qun SUN,Ya-Kun ZHANG,Qun-Feng YE,Ai-Jun WANG
Fluorescent carbon quantum dots (CQDs) were synthesized by one-step hydrothermal treatment with apple juice as raw material. The result indicated that the fluorescence could be quenched by Hg 2+ with high specificity. Based on this phenomenon, a selective and sensitive sensor was constructed for the detection of Hg 2+ in phosphate solutions (pH 7.0). The fluorescence intensity showed linear responses with Hg 2+ concentration ranging from 5.0 to 100.0 nM and 1.0 to 50.0 μM, with the detection limit of 2.3 nM ( S / N = 3). The as-fabricated sensor was further extended for the determination of Hg 2+ in real water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Ruyan Xie,Yaoyao Qu,Mingyu Tang,Jingqiang Zhao,Sophie Chua,Tingting Li,Fang Zhang,Andrew E. H. Wheatley,Fang Chai
The dual functional detection and removal of heavy ion metals by carbon dots has become an urgent matter of concern. Here, a unique fluorescent carbon dot-magnetic nanocomposite (Fe 3 O 4 /CDs) was prepared by hydrothermal methods for sensitive detection of Hg 2+ . The Fe 3 O 4 /CDs serve as fluorescent probes with higher selectivity and sensitivity for Hg 2+ , with the lowest detectable limit of 0.3 nM. Hg 2+ statically quenched the blue emission of Fe 3 O 4 /CDs, which can be restored in the presence of saturated EDTA solution. The utilization of Fe 3 O 4 /CDs was fulfilled by recovering their emission conveniently. The recovery of Hg 2+ in Chagan Lake water, tap water and drinks was calculated at 96.5 ~ 108.8%, which demonstrates the feasibility of the Fe 3 O 4 /CDs sensing system in natural samples. Notably, the Fe 3 O 4 /CDs can drive the effective removal of Hg 2+ from samples, which is of outstanding significance as a promising probe in environmental monitoring.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Juan Wu,Wei Jiang,Aipeng Deng,Yewen Shen,Wei Jiang,Renbing Tian
In this work, a high-performance probe for Hg 2+ detection has been successfully synthesized based on Rhodamine B isothiocyanate (RBI) and thioglycolic acid (TA) co-modified Fe 3 O 4 @Au nanocomposites. The probe has many favorable properties, including suitable size and magnetic response (46.28 emu/g). Importantly, the fluorescence changes of the probe are remarkably specific for Hg 2+ in the presence of other competitive cations, and the limit of detection (LOD) for Hg 2+ in aqueous solutions is lower (3.03 nM) than the value of the World Health Organization (30 nM), which meet the selective and sensitive requirements for practical application. Interestingly, due to the magnetic responsive performance of Fe 3 O 4 , the probe can be recycled by a magnet and reused by addition of free RBI into Fe 3 O 4 @Au solutions that were already used for Hg 2+ detection. Furthermore, the experiments of probe for monitoring Hg 2+ inside human umbilical vein endothelial (HUVEC) cells reveal that the probe has biocompatibility and low cytotoxicity, and can effectively detect Hg 2+ in a short time. All the results presented in this study show that the proposed probe has significant potential for Hg 2+ detection in environmental and biological samples.
研究领域:
分析化学
·
生物医学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 11
·900
·
IF 3.504
Longshi Rao,Yong Tang,Hanguang Lu,Shudong Yu,Xinrui Ding,Ke Xu,Zongtao Li,Jin Z. Zhang
We developed a microreactor with porous copper fibers for synthesizing nitrogen-doped carbon dots (N-CDs) with a high stability and photoluminescence (PL) quantum yield (QY). By optimizing synthesis conditions, including the reaction temperature, flow rate, ethylenediamine dosage, and porosity of copper fibers, the N-CDs with a high PL QY of 73% were achieved. The PL QY of N-CDs was two times higher with copper fibers than without. The interrelations between the copper fibers with different porosities and the N-CDs were investigated using X-ray photoelectron spectroscopy (XPS) and Fourier Transform infrared spectroscopy (FTIR). The results demonstrate that the elemental contents and surface functional groups of N-CDs are significantly influenced by the porosity of copper fibers. The N-CDs can be used to effectively and selectively detect Hg2+ions with a good linear response in the 0~50 μM Hg2+ions concentration range, and the lowest limit of detection (LOD) is 2.54 nM, suggesting that the N-CDs have great potential for applications in the fields of environmental and hazard detection. Further studies reveal that the differentdorbital energy levels of Hg2+compared to those of other metal ions can affect the efficiency of electron transfer and thereby result in their different response in fluorescence quenching towards N-CDs.Keywords:microreactor;carbon dots;porous copper fibers;Hg2+detection
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Ning Wu,Hao Guo,Mingyue Wang,Liping Peng,Yuan Chen,Bingqing Liu,Zhilan Pan,Yinsheng Liu,Wu Yang
Ratio fluorescence has attracted much attention because of its self-calibration properties. However, it is difficult to obtain suitable fluorescent materials with well-resolved signals simultaneously under one excitation. In this work, we report a different strategy, using MIL-68(In)-NH 2 as both the fluorescence element and the scattered light unit, and coupling the fluorescence and the scattered light to construct the fluorescence and scattered light ratio system. Based on the optical properties and the second-order scattering (SOS) of the material nanoparticles , the synthesized MIL-68(In)-NH 2 can be used to realize the ratio detection of Hg 2+ . Because the scattering intensity of small particle MIL-68(In)-NH 2 is weak, SOS is not obvious. When Hg 2+ is introduced the coordination reaction between the amino nitrogen atoms of MIL-68(In)-NH 2 and Hg 2+ make the particles larger, resulting in the decrease of fluorescence and the enhancement of SOS. As a result, a novel Hg 2+ ratiometric detection method is developed by using the dual signal responses of the fluorescence and scattering. Under the optimal conditions (pH = 6, reaction time 5 min, room temperature , and the maximum excitation wavelength 365 nm), the linear range of the method is 0–100 μM, and the detection limit is 5.8 nM (Ksv = 9.89 × 10 9 M −1 ). In addition, the probe is successfully used to evaluate Hg 2+ in actual water samples. Compared with the traditional method of recording only the fluorescence signal, the proposed fluorescence-scattering method provides a new strategy for the design of ratiometric sensors.
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Sujing Wang,Xin Li,Jiaqing Xie,Bingying Jiang,Ruo Yuan,Yun Xiang
Hg 2+ ions are highly toxic and bioaccumulative pollutant that can lead to adverse toxicological effects on environment and human health, and the establishment of simple and sensitive methods for the detection of trace Hg 2+ ions is thus of great significance. On the basis of a new metal ion-triggered and DNA-fueled molecular machine strategy, we have established a sensitive and convenient approach for detecting Hg 2+ in different water samples without involving in any enzymes or nanomaterials for signal enhancement. The target Hg 2+ ions associate with the DNA complex probes through the formation of specific thymine-Hg 2+ -thymine (T-Hg 2+ -T) mismatched base pairing, which results in the release of the fluorescently quenched ssDNA from the complex probes to expose the pre-blocked toeholds. Subsequently, the fuel DNA further binds to the toeholds and triggers the operation of the molecular machine via strand displacement reactions to recycle the target ions, leading to the release of many fluorescently quenched ssDNAs for amplified monitoring of Hg 2+ within the dynamic range of 0.1–100 nM with a detection limit of 65 pM. Besides, with specific T-Hg 2+ -T coordination, the established approach shows high selectivity to the target ions and can be employed to detect Hg 2+ in tap and river water samples.
研究领域:
生物化学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Rongzhen Ma,Lin Chang,Long D. Nghiem,Yuan Liu,Qilin Wang,Qianbin Zhao,Qingju Hao,Yimeng Gao,Hong Liu,Lei Zheng
Carbon dots have emerged as highly efficient and versatile fluorescent probes for detecting and quantifying Hg2+. This study reports a method to prepare nitrogen-doped carbon dots (N-CDs) via ligand-to-metal charge transfer fluorescent quenching for Hg2+ detection. Besides the excitation-independent emission feature, the synthesized N-CDs demonstrate a high selectivity of Hg2+ over 23 potentially interfering environmental ions. The structures of 2-hydroxy-N,N-dimethylbenzamide and amide functional groups are identified as the determinants of the relatively high quantum yield (53.33%). N-CDs also exhibit a linear relationship with Hg2+ concentration in the range of 0.007–120 μM, with a limit of detection of 7.1 nM. The produced N-CDs can be employed in a customized microfluidic real-time monitoring platform, demonstrating the robustness in receiving efficient fluorescence signals with a satisfactory limit of detection. The acceptable accuracy and recovery of Hg2+ detection in tap water and river water highlight the potential practical applications of the synthesized N-CDs. Results in this study can facilitate the development of a portable device for early warning of water pollution.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 15
·6103-6108
·
IF 1.821
Yuling Hu,Dongmei Wang,Gongke Li
Inspired by the bioadhesive and redox properties of the 3,4-dihydroxy-phenylalanine (DOPA) contained in marine mussels, a facile, rapid and economic colorimetric strategy for Hg2+ detection was developed. The abundant catechol chains on the surface of Ag@DOPA can reduce Hg2+ to Hg0 and form a Ag@DOPA@Hg nanostructure with the deposition of Hg0. The nanostructures of Ag@DOPA and Ag@DOPA@Hg were confirmed by X-ray photoelectron spectroscopy, transmission electron microscopy, elemental mapping and Fourier transform infrared spectroscopy. The formation of the Ag@DOPA@Hg nanostructure causes a change in the color of the Ag@DOPA colloids from golden yellow to purple blue, making it directly possible to detect Hg2+ using a colorimetric strategy within 5 minutes. With increasing concentrations of Hg2+ from 10 nM to 4 μM, the surface plasmon resonance absorbance peak of the Ag@DOPA colloids decreased in intensity and exhibited a good linear relationship with the Hg2+ concentration. The limit of detection was determined as 5 nM. Furthermore, this response was found to be highly selective for Hg2+ as the absorption spectrum was not affected by other metal ions such as Pb2+, Cr3+, Cu2+, Al3+, Ni2+, Co2+, etc. The excellent stability, selectivity and sensitivity of this strategy offer analytical practicability for Hg2+ detection in real water samples with recoveries in the range of 104–105% and cosmetic samples with recoveries in the range of 85–103%.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）