Journal of Materials Chemistry B
·
2016
·Vol. 4
·期 47
·7549-7559
·
IF 4.872
Bao-xing Shen,Ying Qian
A novel triphenylamine-BODIPY based Schiff base fluorescent probe (TPA-BODIPY-OH) with an emission in the near-infrared (NIR) region was designed and prepared by click reaction. TPA-BODIPY-OH showed three emission bands at 510 nm, 598 nm and 670 nm, and can detect Fe3+ and Hg2+ ions with remarkable fluorescence enhancement in THF/H2O (v/v, 1 : 1, buffered with 10 mM HEPES pH = 7.4) based on the hydrolysis reaction of the –CN bond, and naked eye detection was realized with an obvious color change. The stoichiometry between the probe and ions was deduced from a Job's plot, which is 1 : 3 for TPA-BODIPY-OH/Fe3+ and 1 : 2 for TPA-BODIPY-OH/Hg2+, respectively. The dissociation constant value was found to be 1.35 × 10−16 M for TPA-BODIPY-OH/Fe3+ and 2.06 × 10−11 M for TPA-BODIPY-OH/Hg2+. The low detection limit was calculated from the titration results with the values of 5.15 × 10−7 M for TPA-BODIPY-OH/Fe3+ and 6.81 × 10−7 M for TPA-BODIPY-OH/Hg2+, respectively. In order to investigate the biological applications of TPA-BODIPY-OH, a living cell imaging experiment was carried out. The results demonstrate that TPA-BODIPY-OH can be successfully applied as a bioimaging agent in living cells. In addition, amino-group-functionalized silica fluorescent nanoparticles (FNPs) encapsulating the TPA-BODIPY-OH dyes were prepared and characterized by transmission electron microscopy. TPA-BODIPY-OH/SiO2 nanoparticles exhibit good dispersibility, and the quantum yield of FNPs at 657 nm was 42.3%.
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高影响因子
DYES AND PIGMENTS
·
2013
·
IF 3.532
Zhengping Dong,Xin Tian,Yuanzhe Chen,Jingran Hou,Yueping Guo,Jian Sun,Jiantai Ma
A novel and simple fluorescent chemosensor based on rhodamine (R-2) is designed and synthesized to detect Hg 2+ . Probe R-2 exhibits high selectivity and sensitivity for sensing Hg 2+ with a detection limit at 10 −8 M level, and displays a significant color change from colorless to pink color in the presence of Hg 2+ . About a 400-fold increase in fluorescence emission intensity is observed upon binding excess Hg 2+ in 50% H 2 O/CH 3 CN HEPES buffer at pH 7.00. The titration results show a 1:1 complex formation between R-2 and Hg 2+ . The reversibility of chemosensor R-2 is verified through its spectral response toward Hg 2+ and I − titration experiments. Using Hg 2+ and I − as chemical inputs and the fluorescence intensity signal as outputs, R-2 can be utilized as an INHIBIT logic gate at molecular level.
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JOURNAL OF LUMINESCENCE
·
2013
·
IF 2.144
Huilin Tao,Xiufen Liao,Mingze Xu,Shuhuai Li,Fuxin Zhong,Zhongsheng Yi
The fluorescence resonance energy transfer between fluorescent brightener (FB, donor) and CdTe quantum dots (CdTe QDs, acceptor) was studied and a new method for detecting Hg 2+ ions in water samples was accordingly developed in this paper. It was found that the effective energy transfer occurred from FB to CdTe QDs in Tris–HCl buffer solution at pH=8.2, in which the QDs' fluorescence intensity increased greatly. Then the fluorescence quenching occurred as Hg 2+ interacted with CdTe. Under the optimized conditions, there was a linear relationship between the fluorescence quenching intensity and the concentration of Hg 2+ . Hg 2+ could be determined in the concentration range of 8.0×10 −9 –8.0×10 −7 g L −1 with a detection limit of 6.6×10 −10 g L −1 ( S / N =3). The method was applied to the determination of Hg 2+ in water samples via the standard addition method, and the recovery rate obtained was 97.3–105.5%.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiao He,Yuxiang Huang,Jinlei Xu,Fang Zeng,Xinjian Cheng
Dendritic fibrous nano-silica (DFNS) possesses unique porous structure, making it an outstanding candidate for heavy metal adsorption and separation. It is interesting to introduce natural polymer (chitosan) into DFNS and produce natural materials-based porous DFNS. Initially, in this work, DFNS underwent modification to enlarge size and enrich with -C≡C bonds. And then, NH2-naphthalimide fluorophore was click-reacted with the modified DFNS, forming fluorescent DFNS (FL-DFNS). Eventually, chitosan was integrated into FL-DFNS using diacyl chloride, generating the organic–inorganic fluorescent composite micro-beads (FL-DFNS@CS-3). FL-DFNS acts as a “turn on” sensor for Hg 2+ /Hg + ions, showing up to 5 times fluorescence increase. Also, it exhibited effective mercury adsorption. Due to its porous structure, it demonstrated good performance in adsorbing and separating Hg 2+ /Hg + ions, achieving removal ratios of 98.8 % and 96.1 %, and adsorption capacities of 196.2 mg/g and 180.4 mg/g, respectively. It reached effective adsorption equilibrium within 15 min and was reusable up to seven times. Overall, this work confirms the practical applicability of FL-DFNS and FL-DFNS@CS micro-beads for identifying and removing Hg 2+ /Hg + ions. Further exploration is worthy to explore its potential in environmental science and engineering.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Jialing Zhou,Hui Huang,Qian Wang,Zhirui Li,Shunji Chen,Jun Yu,Yuan Zhong,Jing Chen,Huolin Huang
Owing to the separation of field-effect transistor (FET) devices from sensing environments, extended-gate FET (EGFET) biosensor features high stability and low cost. Herein, a highly sensitive EGFET biosensor based on a GaN micropillar array and polycrystalline layer (GMP) was fabricated, which was prepared by using simple one-step low-temperature MOCVD growth. In order to improve the sensitivity and detection limit of EGFET biosensor, the surface area and the electrical conductivity of extended-gate electrode can be increased by the micropillar array and the polycrystalline layer, respectively. The designed GMP-EGFET biosensor was modified with l-cysteine and applied for Hg2+ detection with a low limit of detection (LOD) of 1 ng/L, a high sensitivity of −16.3 mV/lg(μg/L) and a wide linear range (1 ng/L-24.5 μg/L). In addition, the detection of Hg2+ in human urine was realized with an LOD of 10 ng/L, which was more than 30 times lower than that of reported sensors. To our knowledge, it is the first time that GMP was used as extended-gate of EGFET biosensor.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2024
·Vol. 26
·期 5
·1-14
·
IF 2.1
Liu Zhe-Nan,Liu Lv-Cheng,Xue Jin-Peng,Li Shi-Gang,Li Xing
In this work, we employed L-methionine (L-M) as the functionalized reagent of AuNPs for the colorimetric and UV–vis dual-mode detection of As 3+ , Cd 2+ , and Hg 2+ ions with excellent selectivity and anti-interference. After adding the target ions, the functionalized AuNPs can be cross-linked together due to the As 3+ /Cd 2+ /Hg 2+ ions reacting with amino N, carbonyl or hydroxyl O of L-methionine to form the coordination bonds, resulting in the aggregation of functionalized AuNPs and cause the different red-shifts of the SPR absorption peak and color changes of functionalized AuNPs solutions. The LODs of the colorimetric sensor are 10 ppb/13 ppb/4 ppb by naked eyes and 2.35 ppb/1.68 ppb/0.32 ppb by UV–vis spectroscopy with good linear relationships between the absorbance ratios (A 633nm /A 519nm , A 645nm /A 519nm and A 665nm /A 519nm ) and As 3+ , Cd 2+ and Hg 2+ concentrations, which can be successfully applied to sense and detect As 3+ /Cd 2+ /Hg 2+ pollutants in tap water, pond water, well water, and other domestic water sources. Graphical Abstract
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Zhu Yu,Zaiwen Tian,Zhengqian Li,Zaoli Luo,Yan Li,Yi Li,Jun Ren
In this paper, a thioacetal chemosensor 1 incorporating simultaneously a carbazole moiety and an azobenzene moiety was synthesized. Among other metal ions , Hg 2+ proved to be able to selectively induce both color and fluorescence changes of 1 . The mechanism of Hg 2+ -promoted cleavage of thioacetal was confirmed by 1 H NMR experiments. Upon the addition of Hg 2+ into the yellow CH 3 CN/H 2 O solution of 1 , the resultant azobenzene-containing thioglycolamide was precipitated from the solution as a mercuric salt, leading to a colorless solution. Therefore, a novel color change pattern was developed.
研究领域:
分析化学
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环境科学
·
材料科学
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JOURNAL OF FLUORESCENCE
·
2022
·Vol. 32
·期 5
·1921-1930
·
IF 2.525
Gao Xiaoxiao,Zhang Yan,Fu Zheng,Cui Fengling
In this paper, the carbon dots (CDs) with strong blue fluorescence were synthesized through hydrothermal method, which using folic acid, ammonium citrate and ethylenediamine as precursors. The prepared CDs with a high absolute quantum yield of 81.94% and showed excellent stability in high concentration salt solution and different pH conditions. With the addition of Hg 2+ , the signal of CDs was selectively quenched. At the same time, the CDs-Hg 2+ system could be recovered after the introduction of biothiols. Moreover, the fluorescence of CDs showed a good linear relationship with Hg 2+ (1–15 µM), and the detection limit as low as 0.08 µM. In addition, the prepared CDs with low toxicity could be used to detect Hg 2+ in living cells and actual water samples.
研究领域:
分析化学
·
环境科学
·
生物医学
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高影响因子
OPTIK
·
2018
·
IF 1.191
Zongguang Xu,Chen Zhang,Xudong Zheng,Zhongyu Li,Song Xu
A highly sensitive and selective optical probe , 2,5-bis[2-(benzylthio)aniline]-croconaine ( BAC ) for sensing of Hg 2+ was synthesized. The BAC can efficaciously recognize Hg 2+ with the existence of competing cations (Ba 2+ , Fe 3+ , Na + , Ca 2+ , Co 2+ , K + , Mg 2+ , Ni 2+ , Cu 2+ , Pb 2+ , Al 3+ , Pb 2+ , Cr 3+ , Cd 2+ , Ag + ) in DMSO . The binding constant (Ka) of BAC -Hg 2+ was calculated to be about 1.6 × 10 5 M −1 . Simultaneously, the chelating mode of BAC -Hg 2+ was confirmed by Job’s plot, FT-IR and 1 H NMR. “Naked eye” detection has been performed, indicating the potential application of BAC on conveniently, selectively and fast detection of Hg 2+ . Moreover, Hg 2+ and EDTA could be employed as inputs and the fluorescence emission intensity which was 480 nm as output so that a molecular logic gate could be realized.
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REACTIVE & FUNCTIONAL POLYMERS
·
2013
·Vol. 73
·期 11
·1553-1558
·
IF 2.505
Bo Yang,Wenhui Wu
A cellulose-based paper chemodosimeter was designed and prepared by reactions of Rhodamine B with natural cellulose paper. Its sensing property to Hg 2+ was investigated by fluorescence spectroscopies . While the Hg 2+ -indicating paper was immersed into the Hg 2+ solution, the ring of the rhodamine spirolactam opened and the thiosemicarbazide moiety would undergo an irreversible desulfurization reaction to form its corresponding oxadiazole structure, a colorful and fluorescent product. The color change can be discerned by a naked eye under the irradiation of 365 nm UV light . The Hg 2+ -indicating paper displayed excellent selective toward Hg 2+ over other commonly metal ions and the sensitive detection of Hg 2+ was not interfered by other heavy metal ions. The results suggested that the Hg 2+ -indicating paper would serve as a practical fluorescent chemodosimeter for rapid and convenience detection of Hg 2+ .
研究领域:
分析化学
·
环境监测
·
材料科学
·
生物传感
·
重金属检测
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Hailong Li,Weilin Zhang,Jun Wang,Zequn Yang,Liqing Li,Kaimin Shih
Simultaneous nitrogen monoxide (NO) reduction and elemental mercury (Hg 0 ) oxidation in the presence of ammonia (NH 3 ) was for the first time studied on a copper oxide/titanium dioxide (CuO/TiO 2 ) catalyst at low flue gas temperatures. More than 80% NO reduction and 90% Hg 0 oxidation were concurrently achieved on the CuO/TiO 2 catalyst at 250 °C under a simulated NH 3 selective catalytic reduction (SCR) atmosphere. NO was likely oxidized on the CuO/TiO 2 catalyst to form active nitrogenous species, particularly with the aid of oxygen. The active nitrogenous species then significantly promoted Hg 0 oxidation. NH 3 itself did not affect Hg 0 conversion on the CuO/TiO 2 catalyst. The co-occurrences of NO and NH 3 led to a reduction in oxidized mercury (HgO in this work), which partially offset the Hg 0 oxidation and therefore resulted in a relatively lower Hg 0 conversion efficiency. However, compared to flue gas without NO and NH 3 , the combined presence of NO and NH 3 still enhanced Hg 0 oxidation over the CuO/TiO 2 catalyst, primarily because of the overwhelming benefit from NO. This is superior to many other SCR catalysts, including commercial vanadia-based SCR catalysts, on which an SCR atmosphere generally inhibits Hg 0 conversion.
研究领域:
环境催化
·
大气污染控制
·
化学工程
·
材料科学
·
环境化学
·
工业生态学
·
能源与环境技术
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Laifeng Ma,Xueyi Zhang,Muhammad Ikram,Mohib Ullah,Hongyuan Wu,Keying Shi
The fabricated intercalated structure composed of a Co-based zeolitic imidazolate framework (ZIF-67) and expanded graphite (EG) has been prepared using a facile and simple one-pot hydrothermal reaction. This framework was used to detect heavy metal ions (HMIs) via a square wave anodic stripping voltammetry (SWASV) method for the first time. Here, the composite material is useful for the selective electrochemical detection of nanomolar Cd 2+ , Pb 2+ , Cu 2+ and Hg 2+ in aqueous solutions simultaneously or individually. The operational parameters such as pH, electrolyte, deposition potential, and deposition time were optimized to detect various HMIs. The electrochemical properties and applications of the modified electrode were also studied. The constructed electrochemical sensor displays good performance with a large electrochemically active surface areas, high sensitivity and low limit of detection (LOD). These impressive features originate from the synergistic effects of ZIF-67 and EG. This study proposes a new strategy for heavy metal ion detection using a novel morphology of a metal–organic framework (MOF) composite.
研究领域:
材料科学
·
环境科学
·
分析化学
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