ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Bin Wen,Jinqiao Xue,Xianjing Zhou,Qingwen Wu,Jingjing Nie,Junting Xu,Binyang Du
Tetra(4-pyridyl)porphyrin (TPyP)-functionalized thermosensitive ionic microgels (TPyP5-MGs) were synthesized by a two-step quaternization method. The obtained TPyP5-MGs have a hydrodynamic radius of about 189 nm with uniform size distribution and exhibit thermosensitive character. The TPyP5-MG microgel suspensions can optically respond to trace Pb2+ ions in aqueous solution with high sensitivity and selectivity over the interference of other 19 species of metal ions (Yb3+, Gd3+, Ce3+, La3+, Bi3+, Ba2+, Zn2+, Ni2+, Co2+, Mn2+, Cr3+, K+, Na+, Li+, Al3+, Cu2+, Ag+, Cd2+, and Fe3+) by using UV–visible spectroscopy. The sensitivity of TPyP5-MGs toward Pb2+ can be further improved by increasing the solution temperature. The limit of detection for TPyP5-MG microgel suspensions in the detection of Pb2+ in aqueous solution at 50 °C is about 25.2 nM, which can be further improved to be 5.9 nM by using the method of higher order derivative spectrophotometry and is much lower than the U. S. EPA standard for the safety limit of Pb2+ ions in drinking water. It is further demonstrated that the TPyP5-MG microgel suspensions have a potential application in the detection of Pb2+ in real world samples, which give consistent results with those obtained by elemental analysis.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Liaojing Huang,Liu Yang,ChuanChao Zhu,Hanmei Deng,Guangpeng Liu,Yali Yuan
It is of great significance to explore reliable and sensitive methods for the trace detection of lead ions (Pb 2+ ), which may cause serious adverse effect to human health. Herein, we proposed a methylene blue (MB) sensitized signal-on photoelectrochemical (PEC) biosensor with 3,4,9,10-perylene tetracarboxylic acid (PTCA) film as photoelectric material for highly sensitive Pb 2+ detection. First, PTCA was modified on the electrode surface, manifesting wonderful film-forming property and acquiring a satisfactory initial PEC signal. Afterward, Pb 2+ -dependent DNAzyme modified on electrode was cleaved by target Pb 2+ , followed by hybridizing MB assembled 3D DNA networks with the exposed Pb 2+ catalytic strand. Significantly, in the presence of sensitizer MB, the PEC signal of PTCA was extraordinarily increased and the designed biosensor performed a high sensitivity with a detection limit down to 0.03 pM. Therefore, with enzyme-free assembly of MB embedded 3D DNA networks, this dye-sensitized strategy exhibited effective and uncomplicated amplification technology for Pb 2+ detection.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Jiao Wang,Ziying Zhang,Xia Gao,Xiaodong Lin,Yaqing Liu,Shuo Wang
Lead ion (Pb 2+ ) is known as a major non-degradable environmental pollutant and is quite harmful to human health. In our investigation, a novel ratiometric fluorescent nanosensor with DNA-AgNCs as single fluorophore has been successfully constructed for ultrasensitive and specific detection of Pb 2+ . The single-strand DNA templated silver nanoclusters present green emission, which can be converted into red emission after approaching a specific DNA segment by forming duplex with its complementary DNA strands (ds-DNA-AgNCs). The ds-DNA-AgNCs contains rA cleavage site of Pb 2+ -dependent DNAzyme configuration. In the presence of Pb 2+ , the specific DNA segment would be released from the ds-DNA-AgNCs, resulting in discoloration of DNA-AgNCs from red to green. Since Pb 2+ can successively cleave the rA site, the signal change from red to green emission is amplified. Thus, benefiting from the Pb 2+ -dependent DNAzyme and the charming properties of DNA-AgNCs, the proposed platform exhibits a good linear relationship from 0.001 nM to 10 nM with a detection limit of 1.0 pM for Pb 2+ determination, which is lower than most of the reported Pb 2+ biosensors. Moreover, this sensitive ratiometric fluorescent probe exhibits excellent selectivity toward Pb 2+ detection in real samples, such as lake water, tap water, and human serum samples, illustrating the huge potential applications for complicated samples in the future.
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高影响因子
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Weiwei Chu,Zhenzhen Lu,Ruiqin Tan,Shihui Tang,Wei Xu,Weijie Song,Junhua Zhao
In this work, β-SrHPO 4 , Sr 3 (PO 4 ) 2 , and Sr 5 (PO 4 ) 3 (OH) (SrHAp) powders were successfully prepared by a controllable hydrothermal method and were utilized in removal of lead ion (Pb 2+ ). The effects of pH value, contact time and initial ion concentration on the immobilization of Pb 2+ were investigated systematically. Results showed that β-SrHPO 4 exhibited a capacity of 1438 ± 45 mg/g for Pb 2+ , while Sr 3 (PO 4 ) 2 and SrHAp showed values of 1223 ± 45 mg/g and 543 ± 45 mg/g respectively under the optimum conditions. The XRD , SEM and EDX results revealed that the mechanism of Pb 2+ immobilization by β-SrHPO 4 , Sr 3 (PO 4 ) 2 and SrHAp was mainly due to a process of dissolution and precipitation in the acidic solution. Comparing the immobilization behavior and capacities of β-SrHPO 4 , Sr 3 (PO 4 ) 2 and SrHAp for Pb 2+ removal, it is shown that β-SrHPO 4 is an effective and eco-friendly material for the removal of Pb 2+ from acidic aqueous solutions among strontium phosphates materials.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Yaoge Huang,Zhuqing Wang
A novel Ethylenediamine-Modified Calcium Alginate Aerogel (ECAA) was synthesized by freeze-drying method, and used to remove Pb 2+ and Cu 2+ from aqueous solutions. The prepared adsorbent was characterized by using the FTIR spectra, SEM analysis and XPS analysis . The effects of the pH, initial metal ion concentration, adsorption kinetics , and isotherms had been studied systematically. Moreover, the ECAA can be regenerated by simple acid treatment and used repeatedly. It is interesting to note that almost no Ca 2+ can be detected after the first cycle that confirmed the adsorption process involves ion exchange.The XPS spectra analyses further indicated that Pb 2+ and Cu 2+ were adsorbed via the chelation of −CO-NH, −NH 2 and −OH. The results from these studies indicated the aerogel is a promising adsorbent to separate and recover the heavy metal ions from contaminated water.
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高影响因子
ELECTROANALYSIS
·
2015
·Vol. 28
·期 1
·63-68
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IF 2.138
Jiao Wang,Xuerong Chen,Kangbing Wu,Miao Zhang,Wensheng Huang
Graphene nanosheets (GS) were prepared via ultrasonic exfoliation, and used to modify glass carbon electrode (GCE). Compared with GCE, the GS-modified GCE (GS/GCE) greatly increased the anodic stripping peak currents of Cd 2+ and Pb 2+ . Moreover, the response signals of Cd 2+ and Pb 2+ on GS/GCE further enhanced remarkably in the presence of Bi 3+ . Based on the synergistic enhancement effects of GS and Bi 3+ , a novel electrochemical sensor was developed for Cd 2+ and Pb 2+ . The detection limits were 0.35 and 0.045 μg L −1 for Cd 2+ and Pb 2+ . It was used in food sample analysis, and the accuracy was tested by ICP-MS.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Haorong Sun,Hangxi Liu,Ming Fang,Zeyi Chen,Yifeng Zhang,Xiaoli Tan
Heavy metal pollution, particularly Pb 2+ , poses a severe threat to human survival and ecosystem health due to its detrimental effects on organisms. Therefore, evaluating the concentration of Pb 2+ in the environment can help mitigate these risks in advance. In this study, Cu nanoparticles (Cu NPs) modified 2D Cu-Metal-organic frameworks (Cu(NPs)/Cu-MOFs@ITO) are prepared and loaded onto indium tin oxide (ITO) glass by an electrophoretic method to produce an electrochemical sensor (ECS) for Pb 2+ . Cu(NPs)/Cu-MOF-B was synthesized by a simple solvothermal method and characterized by XRD, SEM, TEM , Raman, FT-IR and other methods to analyze the crystal structure, molecular structure and microstructure. The Cu NPs improve the electron transfer ability, and the abundant surface amino groups of Cu-MOF can be used to bind Pb 2+ characterized by CVs and EISs. The excellent energy positions of valence and conduction bands of Cu(NPs)/Cu-MOF facilitate the electron migration in oxidation and reduction of Pb 2+ analyzed by XPS, Mott-Schottky and UV–vis absorption curves. The limit of detection (LOD) reaches 0.065 μM and the sensitivity reaches 99.04 μA μM -1 cm -2 . The Cu(NPs)/Cu-MOFs@ITO ECS can be successfully applied to detect Pb 2+ in water environments with high sensitivity, selectivity and reproducibility, which provides a feasible method for detecting Pb 2+ .
研究领域:
环境科学
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材料科学
·
分析化学
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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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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
·
IF 4.326
Longsheng Pei,Hanlun Yang,Shouhui Chen,Li Wang
The metal–organic framework (MOF) UiO-66-NH2 was synthesized and attached to kenaf stem-derived three-dimensional macroporous carbon (3D-KSC) simultaneously, and then, the isothiocyanate functional group was introduced into UiO-66-NH2 MOFs to prepare UiO-66-NHC(S)NHMe/3D-KSC nanocomposites. The amount of UiO-66-NHC(S)NHMe MOFs on 3D-KSC can be controlled easily by the monomer concentration. There were three adsorption sites (two nitrogen atoms and one sulfur atom) on each structural unit of UiO-66-NHC(S)NHMe for adsorption toward heavy metal ions (HMIs) and well-regulated pores and 3D macropores of 3D-KSC to promote the transfer of HMIs. Therefore, UiO-66-NHC(S)NHMe/3D-KSC nanocomposites can be applied for the removal and electrochemical detection of Cd2+, Pb2+, Cu2+, and Hg2+. The detection limits of Cd2+, Pb2+, Cu2+, and Hg2+ were 0.0125, 0.0124, 0.0111, and 0.0094 μM, respectively. The sensitivities were 879.1, 887.6, 992.5, and 1160.7 μA μM–1 cm–2, respectively. UiO-66-NHC(S)NHMe/3D-KSC showed fine reproducibility and stability as well as strong anti-interference ability. In addition, the HMIs can be removed effectively by UiO-66-NHC(S)NHMe/3D-KSC with the maximum adsorption capacity of 88, 391, 223, and 935 mg·g–1 for Cd2+, Pb2+, Cu2+, and Hg2+, respectively. The results show that UiO-66-NHC(S)NHMe/3D-KSC has great potential for the adsorption and detection of HMIs.
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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高影响因子
Biomicrofluidics
·
2015
·Vol. 9
·期 2
·
IF 3.357
Li Yinbao,Yang Xiujuan,Chen Zuanguang,Zhang Beibei,Pan Jianbin,Li Xinchun,Yang Fan,Sun Duanping
Investigations were conducted to determine acute effects of Pb 2+ and Cu 2+ presented individually and collectively on zebrafish embryos. Aquatic safety testing requires a cheap, fast, and highly efficient platform for real-time evaluation of single and mixture of metal toxicity. In this study, we have developed a microfluidic system for phenotype-based evaluation of toxic effects of Pb 2+ and Cu 2+ using zebrafish ( Danio rerio ) embryos. The microfluidic chip is composed of a disc-shaped concentration gradient generator and 24 culture chambers, which can generate one blank solution, seven mixture concentrations, and eight single concentrations for each metal solution, thus enabling the assessment of zebrafish embryos. To test the accuracy of this new chip platform, we have examined the toxicity and teratogenicity of Pb 2+ and Cu 2+ on embryos. The individual and combined impact of Pb 2+ and Cu 2+ on zebrafish embryonic development was quantitatively assessed by recording a series of physiological indicators, such as spontaneous motion at 22 hours post fertilization (hpf), mortality at 24 hpf, heartbeat and body length at 96 hpf, etc. It was found that Pb 2+ or Cu 2+ could induce deformity and cardiovascular toxicity in zebrafish embryos and the mixture could induce more severe toxicity. This chip is a multiplexed testing apparatus that allows for the examination of toxicity and teratogenicity for substances and it also can be used as a potentially cost-effective and rapid aquatic safety assessment tool.
研究领域:
毒理学
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环境科学
·
生物医学工程
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Ji Zhang,Chenguang Yang,Yan Xu
Hierarchical electrochemical sensors with specific recognition function have been widely applied for trace amounts detection of metal ions, showing great significance for monitoring environmental quality. Herein, a novel flower-like ytterbium benzene-1,3,5-tricarboxylate metal-organic framework (Yb-MOF-1) was prepared by a one-step solvothermal method, which was then cast on a glassy carbon electrode to construct a sensing platform. Compared to the traditional rod-like Yb-MOF-2 prepared at a lower pH (pH = 4.26), the Yb-MOF-1 assembled from ultrathin nanosheets has a large surface area (462.356 m²/g), showing simultaneous electrochemical detection performance towards Cd 2+ , Pb 2+ and Cu 2+ in aqueous solution with detection limits of 9.22, 1.69, 15.15 nM, respectively. The experimental results demonstrate its good anti-interference and repeatability. The reliable practical application of Yb-MOF-1 for Cd 2+ , Pb 2+ and Cu 2+ detection in real water samples shows good recovery rates ranging from 95.8 % to 103.5 %, proving the effective strategy in exploring efficient electrochemical sensing materials.
研究领域:
环境科学
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材料科学
·
分析化学
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zhaohong Su,Jiaqi Wang,Shiyu Hu,Yongbing Cheng,Yuan Yang,Shumo Zhou,Min Chen,Qinyi Cao,Songbai Zhang,Lixia Yang,Zhonghua Liu,Xinman Tu
Surface engineering is an indispensable basic means to improve the properties of carbon nanomaterials and expand their application fields. Herein, tea residue was used as raw material to produce nano-biochar (NBC) by thermal decomposition method. Then the NBC was reshaped in situ on electrode surface to obtain electroreduced NBC (ErNBC) by cyclic voltammetry. After related material characterization, it is found that the properties of NBC are ideally reshaped after in situ electrochemical reduction, the size of NBC is reduced, the content of O element is increased, the hydrophilicity of NBC is enhanced, and the conductivity of NBC is improved. A model was constructed synchronously, and theoretical calculations were conducted to verify the changes in the material’s energy gap. Meanwhile, utilizing the structural properties of ErNBC, we develop an electrochemical sensor combined with machine learning for selective detection of Pb 2+ in actual water samples with a satisfactory recovery rate.
研究领域:
环境科学
·
材料科学
·
分析化学
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