Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 14
·4877-4887
·
IF 7.393
Li Xiao,Kaiqi Liu,Lian Duan,Xinjian Cheng
The detection and removal of heavy metals in the environment is urgent and meaningful. In this work, two types of fluorescent functionalized silks OSP and ASP have been prepared using worm silk as the substrate. These fluorescent silk probes exhibit an obvious fluorescence quenching effect in the presence of Hg2+ or Ag+, enabling silk to specifically detect Hg2+ or Ag+. An obvious color response occurs under visible light, from yellow to brown or gray, thereby realizing dual-channel identification of fluorescence and colorimetry. In addition, its sensing mechanism has been studied, and it is found that the probe reacts with metal ions as a reactive response. Compared with the fluorescent probes bearing one CC/CC bond, the probes with two terminal CC/CC bonds are more sensitive. And the excellent recognition ability can make the limit of detection as low as 0.25 μM. This indicates that silk fluorescent probes can be used to detect Hg2+ and/or Ag+.
研究领域:
生物化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2012
·
IF 4.173
Zhuqing Wang,Dayu Wu,Genhua Wu,Ningning Yang,Aiguo Wu
Rhodamine hydrazide modifying Fe 3 O 4 microspheres (Fe 3 O 4 -R6G) was developed for selective detection and removal of mercury ion from water. With a saturation magnetization of 74.2 emu/g, the Fe 3 O 4 -R6G could be simply recollected from water with magnetic separation within a few minutes. The selectivity and adsorption ability of Fe 3 O 4 -R6G for metal cations were studied by fluorophotometry and atomic absorption spectrometry, respectively. The results showed that Fe 3 O 4 -R6G exhibited excellent selectivity for sensing mercury ion over other metal ions in aqueous solution, and also adsorbed 91% of mercury ion. The maximum adsorption capacity of the Fe 3 O 4 -R6G for Hg 2+ ion was 37.4 μmol g −1 . The Fe 3 O 4 -R6G was successfully applied to the determination of Hg 2+ in environmental samples, and could be used repeatedly by treatment with tetrabutylammonium hydroxide.
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
TALANTA
·
2020
·
IF 5.339
Shuo Wu,Yan Zhao,Xunxun Deng,Xinlan Yang,Xiuyun Wang,Yanqiu Zhao
This work demonstrates that the photoelectrochemical response of the CdS/Bi 2 O 2.33 direct Z-scheme heterojunction, synthesized by in situ deposition of CdS nanocrystals on the defect engineered Bi 2 O 2.33 , can be modulated by oxygen defect concentration. The appropriate oxygen defects not only increase the visible light absorption, provide active reaction sites to enhance PEC activity, but also promote the separation of carriers. The formation of CdS/Bi 2 O 2.33 direct Z-scheme heterojunction further improves these properties by extending the visible light absorption and promoting separation and transport of carriers, but avoids the usage of noble metal nanoparticles as electron transfer mediators, thus has a low cost and easy fabrication technology. The CdS/Bi 2 O 2.33 direct Z-scheme junction shows significantly improved photocurrent response as compared with those containing less oxygen defects, and is applied as a photoelectrochemical assay platform for Hg 2+ . The specific interaction between Hg 2+ and the S 2− in CdS significantly quenches the photocurrent response of the CdS/Bi 2 O 2.33 due to the formation of HgS. The photocurrent decrease is linear to the concentration of Hg 2+ in the range from 10 −11 to 10 −6 g/mL, with the limit of detection of 3.2 pg/mL. High accuracy and good reproducibility are realized in the real sample analysis of urine, river water, and sea water. The integration of oxygen defect engineering and direct Z-scheme electron transport principle provides a new avenue for fabricating high performance photoelectrochemical materials, which can be further combined with bio-recognition strategy for the ultrasensitive detection of biological molecules.
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
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Hao Zhang,Zihan Yuan,Mingkun Wang,Lin Zhu,Xiao Cheng,Duxia Cao,Ruifang Guan,Chuanjian Zhou
Graphene quantum dots (GQDs) are a new type of carbon material that have received widespread attention in recent years. However, due to their complex structure, it is difficult to explore their fluorescence emission mechanism and application mechanism. In this work, GQDs with simple structure were prepared using citric acid as a single precursor. The fluorescence properties and structure of GQDs were characterized, and the results confirmed that their luminescence originated from the n → π* electronic transition produced by the oxygen-containing functional groups in the edge state. Significantly, GQDs can be used as excellent probes to detect Hg 2+ and ClO − in aqueous solution. Hg 2+ combines with the carboxyl groups of the edge states of GQDs to form a complex, and then reduces the fluorescence emission through non-radiative electron transfer . ClO − can oxidize the hydroxyl groups in the edge states of GQDs to make them positively charged, which prevents electron transfer related to the luminescent center and reduces fluorescence emission.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Jianfeng Liu,Ying Qian
In this work, a novel pyridylvinyl rhodamine-naphthalimide ratiometric fluorescent probe , In this work, a novel pyridylvinyl rhodamine-naphthalimide ratiometric fluorescent probe, RNVP , was synthesized and characterized by 1 H NMR, 13 C NMR and HRMS techniques. This probe shows high selectivity and sensitivity towards Fe 3+ and Hg 2+ . At a low concentration of Fe 3+ /Hg 2+ , a new emission peak appeared at 581 nm and enhanced significantly along with naked-eye sensitive color changes, which spirolactam-ring moiety of rhodamine was converted to the open-ring form in the presence of Fe 3+ /Hg 2+ . Further addition of Fe 3+ /Hg 2+ , the fluorescence intensity at 438 nm was enhanced rapidly, which attributed to the suppression of the PET process. The proposed sensing system of probe RNVP represented dual-channel and segment detection behavior, with the fluorescence “turn-On or Off” response and a very low detection limit of 2.72×10 −8 M and 9.08×10 −8 M, and the dissociation constant (Kd) were calculated to be 4.95×10 −7 M 3/2 and 6.68×10 −8 M 3/2 , respectively. RNVP also quick responded linearly to the acidic solution and monitor the pH change in the range of 2.92–4.5, as well as excellent reversibility.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
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
FOOD CHEMISTRY
·
2024
·
IF 8.5
Siying Che,Yao Fan,Xuemei Hu,Linlin Yin,Haiyan Fu,Yuanbin She
A novel fluorescent probe was fabricated using fluorescein-based ionic liquids (ILs) to effectively achieve rapid and accurate detection of Hg 2+ and CH 3 Hg + in food. A probe developed by addition of modified fluorescein into the functionalised ILs presented a promising sensitivity toward Hg 2+ and CH 3 Hg + at concentrations of 0.4 and 60 nM, respectively. In addition, the novel probe could achieve visual and timely detection of Hg 2+ and CH 3 Hg + by the naked eyes at concentrations of 0.1 and 1 μM, respectively. The probe could also overcome the interference of potential ions and common organic ligands and detect Hg 2+ and CH 3 Hg + in real food samples, such as green tea and liquor. The probe could be converted into a paper-based sensor to visually detect Hg 2+ and CH 3 Hg + at levels as low as 10 nM.
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
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 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%.
研究领域:
化学
·
生物成像
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-10
·
IF 3.998
Qu Zixiang,Meng Xia,Duan Hongdong,Qin Dawei,Wang Lizhen
A highly effective method for the research and development of a novel macroscopic hydrogel sensor and bilayer hydrogel is reported. Based on Rhodamine 6G, an Hg 2+ sensitive fluorescent functional monomer was synthesized, then the monomer was utilized to synthesize hydrogel sensors and bilayer hydrogels. Hydrogel sensor has prominent selectivity to Hg 2+ , the bilayer hydrogel has shape changing function additionally. By combining a thermoresponsive hydrogel layer, poly N-isopropylacrylamide (PNIPAM), with an Hg 2+ selective hydrogel layer via macroscopic supramolecular assembly, a bilayer hydrogel is obtained that can be tailored and reswells. The bilayer hydrogel sensor can show complex shape deformation caused by the PNIPAM layer and the Hg 2+ -responsive characteristic of hydrogel sensor layer can be observed under visible light or UV light. This work will provide novel insights for the design and synthesis of novel smart materials with synergistic functions.
研究领域:
材料科学
·
化学传感
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FLUORESCENCE
·
2022
·Vol. 32
·期 5
·1755-1759
·
IF 2.525
Nie Jia,Xu Tong,Liu Qian,Yang Chun,Sun Xuping
Hg 2+ is one of the most toxic heavy metal ions that exist in the environment and it forms large numbers of toxic binary compounds. Accurate and rapid detection of the concentration of heavy metal ions is a prerequisite technology to achieve pollution control and prevention. Fluorescent probes have attracted extensive attention because of their high sensitivity, prominent precision, convenient and fast visualization of heavy metals. Herein, we report multi-layered graphitic carbon nitride via a simple thermopolymerization treatment as a very effectual fluorescent probe for sensitive and selective detection of Hg 2+ with a limit of detection as low as 1.14 nM.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 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）