Analytical Methods
·
2019
·Vol. 12
·期 4
·520-527
·
IF 2.378
Xianfeng Wang,Mina Sakinati,Yixia Yang,Yi Ma,Mei Yang,Huibo Luo,Changjun Hou,Danqun Huo
In this work, a coumarin derivative (CND) was synthesized by a one-step condensation reaction and exhibited selective fluorescence quenching by Cu2+. Glyphosate with amine and carboxylate groups provided strong chelation for Cu2+ from the CND/Cu2+ system, leading to fluorescence recovery. In this strategy, a CND/Cu2+ fluorescence sensing system was constructed to achieve the quantitative analysis of glyphosate. Under the optimized experimental conditions, a good linear relationship between CND and Cu2+ of glyphosate concentration in the range from 0.02 μg mL−1 to 1.50 μg mL−1 was obtained and the correlation coefficient was 0.99. The detection limit was calculated to be 18.30 ng mL−1 (S/N = 3) and presented relative advantages compared with other methods. The interference study exhibited excellent selectivity towards glyphosate. In addition, satisfactory recoveries ranging from 91.31% to 105.28% were achieved for the real samples. These results indicate that the CND/Cu2+ fluorescence sensing system has practical application prospects.
研究领域:
分析化学
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环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·
IF 0.936
Xiang-Yi DENG,Ya-Li FENG,Dong-Sheng HE,Zhen-Yue ZHANG,De-Feng LIU,Ru-An CHI
Polyethyleneimine functionalized carbon quantum dots (PEI-CQDs) were synthesized by one-step hydrothermal method using biomass tar as carbon precursor, which was produced in the reduction smelting process. Based on the selective fluorescence quenching effect between Cu 2+ and PEI-CQDs, the accurate and rapid detection of Cu 2+ was achieved. The results showed that as-prepared PEI-CQDs were spherical particles with uniform sizes, and the average particle size was 1.98 nm. Excellent dispersibility could be obtained in aqueous solution due to the hydrophilic functional groups (such as −COOH, −NH, −CN and C−O) on the surface of PEI-CQDs. The fluorescence quantum yield of CQDs increased from 11.3% to 27.3% after PEI functionalization. Cu 2+ could selectively interact with amino groups on the surface of PEI-CQDs by complexation, leading to the fluorescence quenching effect of PEI-CQDs. And the fluorescence quenching degree exhibited a linear relationship with the Cu 2+ concentration ranging from 0.08 μmol/L to 400 μmol/L with a detection limit of 80 nmol/L. As fluorescent probes, PEI-CQDs have good accuracy and repeatability in Cu 2+ detection, showing outstanding practical feasibility.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Lilu Qin,Liangguo Yan,Jian Chen,Tiantian Liu,Haiqin Yu,Bin Du
The amino-functionalized magnetite/kaolin clay (MKC) was synthesized via a simple solvothermal method and used to remove Pb2+, Cu2+, and Cd2+ from aqueous solutions. In comparison, the kaolin clay (KC) and MKC were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and scanning and transmission electron microscopy with energy dispersive spectrometry. The results indicated amino-functionalized MKC was formed with Fe3O4 particles adhering to the surface by interactions with negatively charged KC. The optimal experimental conditions were evaluated, and the adsorption performance of MKC for Pb2+, Cu2+, and Cd2+ was far better than that of KC. This was mainly caused by adding an amino group, in which the amino group displayed complexing ability toward metal ions. In kinetic data representation, the pseudo-first-order, pseudo-second-order, and Elovich models were employed, and the second one gave the better fitting. Langmuir, Freundlich, and Dubinin–Radushkevich models were chosen for isotherm data correlation, of which the first one showed better suitability. The X-ray photoelectron spectroscopy analysis of MKC before and after adsorption further revealed that the adsorption mechanisms of Pb2+, Cu2+, and Cd2+ could be a combined reaction of complexation between functional groups and metal ions and electrostatic attraction. In addition, MKC can be rapidly separated using only a magnet after the adsorption process.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jun Wang,Yining Pan,Liangxing Jiang,Min Liu,Fangyang Liu,Ming Jia,Jie Li,Yanqing Lai
Copper ions are not only physiologically essential for life but also hazardous materials causing a series of neurodegenerative diseases. Photoelectrochemical (PEC) detection has attracted a large amount of focus as a potential strategy to develop Cu2+ ion sensors. However, relatively low photocurrent signals with poor antidisturbance ability and the limited concentration range have prevented its practical applications. Here, we designed a WO3/CdS heterojunction photoanode for the PEC determination of Cu2+ in aqueous solution through a simple two-step chemical bath deposition method. The obtained WO3/CdS photoanode had a nanoplate morphology and showed an enhanced photoresponsivity with a photocurrent density of 1.5 mA/cm2 at 1.23 V versus RHE under illumination. Naturally, it exhibited a low detection limit (0.06 μM) and wider range (0.5 μM to 1 mM) for Cu2+ PEC detection first, suggesting that the WO3/CdS heterojunction photoanode is a promising tool to monitor copper pollution in natural environments.
研究领域:
环境科学
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Micro & Nano Letters
·
2020
·Vol. 15
·期 8
·535-539
·
IF 0.975
Hongguang Zhang,Meng Wang,Feng Xu
Developing cheap photocatalysts with highly visible-light activity is greatly desired for environmental pollution treatment. In this work, the authors designed and synthesised Cu 2+ -doped TiO 2 (Cu-TiO 2 ) hollow spheres with enhanced photocatalytic activity and antimicrobial activity using a simple hydrothermal process. The X-ray powder diffraction (XRD) results revealed that Cu-TiO 2 hollow spheres were anatase crystal phase. The Cu 2+ -doped into TiO 2 can be confirmed by XRD, Raman spectra, and UV–Vis spectrum. The photocatalytic activity of Cu-TiO 2 samples was evaluated by the degradation of methyl orange. Comparing to the undoped TiO 2 , 6% Cu-TiO 2 sample exhibited remarkably high photocatalytic towards methyl orange under simulated sunlight irradiation, which was attributed to the fact that copper ion doping produced numerous oxygen vacancies (V O ) in the material. In addition, it also showed improved antibacterial properties against both Gram-positive Staphylococcus aureus ( S.aureus ) and Gram-negative Escherichia coli ( E.coli ) bacteria. These results establish that Cu 2+ doping can obviously improve the photocatalytic performance of TiO 2 under simulated sunlight.
研究领域:
材料科学
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环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
Biomaterials Advances
·
2025
·
IF 6
Haoyan Cheng,Beng Ma,Wanting Xia,Ying Yu,Jiayi Li,Keke Zhang,Linlin Shi,Hao Hu,Shegan Gao,Zhihong Zhu
In this study, we developed an innovative Cu 2-x Se/PDA/AIPH nanoparticle platform that combines photothermal therapy and chemotherapy for effective tumor treatment. The Cu 2-x Se nanoparticles, known for their strong near-infrared (NIR) absorption, were encapsulated within a polydopamine (PDA) and 2,2′-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride (AIPH) matrix. Upon NIR irradiation, the platform triggers localized heating and subsequent thermal decomposition of AIPH, releasing ROS to induce significant oxidative damage in tumor cells. In vitro and in vivo experiments demonstrated that Cu 2-x Se/PDA/AIPH nanoparticles exhibit excellent biocompatibility, effective photothermal conversion, and potent anticancer efficacy. This multifunctional nanosystem offers a promising approach for enhancing tumor therapy by combining PTT with ROS-mediated chemotherapy.
研究领域:
肿瘤学
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纳米医学
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生物材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2018
·
IF 2.891
Qingming Wang,Shanshan Wu,Yingzi Tan,Yulin Yan,Lei Guo,Xinhui Tang
In present report, a new BDA for Cu 2+ has been disclosed for the first time. The presence of Cu 2+ caused an obvious fluorescence enhancement at 407 nm upon excitation at 360 nm, which could be distinguished by the naked eye under a UV lamp. It was found to have acceptable detection limits (0.12 μM), high selectivity and reversibility/reusability. The photoluminescence measurement indicates that BDA with Cu 2+ presence, showed very strong blue emission bands with CIE chromaticity coordinates (0.1652, 0.0723). Besides, the designed probe has shown potential applications in the area of sample monitoring, photo-printing.
研究领域:
分析化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2021
·Vol. 18
·期 24
·13383
·
IF 3.39
Ziwen Xu,Shiquan Lv,Shuxiang Hu,Liang Chao,Fangxu Rong,Xin Wang,Mengyang Dong,Kai Liu,Mingyue Li,Aiju Liu
Paddy soils are globally distributed and saturated with water long term, which is different from most terrestrial ecosystems. To better understand the environmental risks of antibiotics in paddy soils, this study chose sulfadiazine (SDZ) as a typical antibiotic. We investigated its adsorption behavior and the influence of soil solution properties, such as pH conditions, dissolved organic carbon (DOC), ionic concentrations (IC), and the co-existence of Cu2+. The results indicated that (1) changes in soil solution pH and IC lower the adsorption of SDZ in paddy soils. (2) Increase of DOC facilitated the adsorption of SDZ in paddy soils. (3) Cu2+co-existence increased the adsorption of SDZ on organic components, but decreased the adsorption capacity of clay soil for SDZ. (4) Further FTIR and SEM analyses indicated that complexation may not be the only form of Cu2+and SDZ co-adsorption in paddy soils. Based on the above results, it can be concluded that soil solution properties and co-existent cations determine the sorption behavior of SDZ in paddy soils.Keywords:sulfadiazine;Cu2+co-existence;paddy soils;adsorption;soil properties
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2021
·
IF 1.134
Ke-Xin WANG,Chen NIE,Rui-Fang GUAN,Hao ZHANG
In recent years, unconventional fluorescent molecules without conjugated rings have attracted widespread interest due to their excellent fluorescence properties, simple preparation process, good water solubility and excellent biocompatibility. Dual emission fluorescent probes are usually more accurate and sensitive, for eliminating the influence of environmental factors. This work provides a novel strategy to construct double emission fluorescent probes based on unconventional fluorescent molecules and fluorescein isothiocyanate. The aqueous solution of resulting double emission polymer dots ( f-PDs ) shows two fluorescence emission peaks centered at 440 nm and 510 nm under excitation at 363 nm. According to change of these two peaks after adding ions, Cu 2+ and ClO − are judged quantitatively. Cu 2+ or ClO − are also quench fluorescence of f-PDs linearly, as Cu 2+ combines with polyethyleneimine parts of f-PDs to form complexes, while ClO − oxidize hydroxyl groups on the surface of f-PDs . The detection limits of Cu 2+ and ClO − , in an aqueous solution are 6.7 nM and 14.0 nM, respectively.
研究领域:
分析化学
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生物医学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yulin Zhu,Mengqi Zhu,Qiuju Zhou,Qunwei Shu,Kejun Tan
Up/down-conversion dual-emission carbon dots (U/D-CDs) are rare and have potential in analytical sensing. Herein, a kind of novel U/D-CDs was prepared successfully by a one-step solvothermal method. The prepared U/D-CDs exhibited similar dual-emission behaviors at excitation wavelengths of 300 nm and 680 nm, respectively. In addition, U/D-CDs displayed good photostability and salt-resistance. Due to the protonation-deprotonation, U/D-CDs showed strong pH dependence in the pH range of 2.0–8.0, which developed an up/down-conversion dual-channel ratiometric fluorescence (FL) probe of pH. The FL intensity of U/D-CDs can be effectively quenched by Cu 2+ through the static quenching effect. Meanwhile, an obvious color change from yellow-green to blue can be observed under ultraviolet light with the increase of Cu 2+ concentration. The up/down-conversion dual-channel ratiometric fluorescence sensor can be used for the visual sensing of pH and Cu 2+ , which also eliminates background signals and improves its accuracy and selectivity in complex samples.
研究领域:
分析化学
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材料科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Linxiu Zhao,Junli Shi,Yongzheng Liu,Mingfeng Han,Shengling Li,Duanlin Cao
Background In recent years, environmental pollution has been increasing due to the excessive emission of toxic ions, which has caused serious harm to human health and ecological environment. There are various methods for detecting Cu 2+ , S 2− and Zn 2+ , but the traditional ion detection methods have obvious disadvantages, such as poor selectivity and long detection time. Therefore, it is still crucial to develop simple, efficient and rapid detection methods. Results A fluorescent probe based on benzothiazole, ( E )- N '-(3-(benzo[ d ]thiazol-2-yl)-2-hydroxy-5-methylbenzylidene)-3,4,5-tris(benzyloxy)benzohydrazide ( BT ), was designed and synthesized. It was characterized using ESI-MS, 1 H NMR, and 13 C NMR. BT can be used as a chemosensor to detect Cu 2+ , S 2− and Zn 2+ in CH 3 CN/H 2 O (7:3, v/v, pH = 7.4, HEPES buffer: 0.1 M), with detection limits of 0.301 μM, 0.017 μM, and 0.535 μM, respectively. At an excitation wavelength of 320 nm, BT exhibits an “on-off-on” response to Cu 2+ /S 2− and enhanced fluorescence response to Zn 2+ , with a change in fluorescence color from orange to green. The coordination ratio of ions to the probe was determined to be 1:1 through Job's plot and hydrogen spectral titration. The recognition mechanism was discussed in conjunction with theoretical calculations. Furthermore, the probe has been successfully used in test strips and medical swabs colorimetry, as well as live cell imaging. Significance The probe BT lays the foundation for the design and synthesis of multifunctional fluorescent probes. As a portable detection method, probe BT was used to detect Cu 2+ , S 2− and Zn 2+ on strips. Furthermore, the probe was applied to biological cells to detect target ions with low cytotoxicity and excellent cell permeability. This indicating that it can be used as a potential candidate for tracking Cu 2+ and S 2− in clinical diagnostics and biological systems.
研究领域:
分析化学
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生物医学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Haojing Zhang,Taotao Lu,Mengjie Wang,Ruixia Jin,Yumeng Song,Yanmei Zhou,Zhichong Qi,Weifeng Chen
Biochar, a cost-effective carbonaceous material , has shown great promise in many applications such as soil remediation and wastewater treatment . Citric acid in soil and water environments may affect interactions between biochar and organic contaminants (e.g., tetracycline). To evaluate the effect of citric acid on the adsorption of tetracycline onto biochars, this study investigated the adsorption behavior of tetracycline onto biochars of two different pyrolysis temperatures (300 and 450 °C, referred to as BC_300 and BC_450) in the present of citric acid, accompanying with the effects of solution pH and Cu 2+ . The results indicated that citric acid significantly inhibited the adsorption of tetracycline onto both biochars, that was mainly due to the multi-mechanisms including pore blocking effect, surface adsorption sites competition, and steric hindrance induced by citric acid. Moreover, citric acid more significantly suppressed the adsorption of tetracycline onto the two biochars at pH 9.0 than at pH 5.0 and 7.0. Because increasing pH could promote electrostatic repulsion between the negative tetracycline and the negatively charged surface of biochars. Cu 2+ had greater enhancing effect on the sorption of tetracycline onto BC_300 than BC_450 via cation-bridging effect. Meanwhile, citric acid inhibited the adsorption of tetracycline onto BC_300 to a larger extent than the adsorption onto BC_450 in the presence of Cu 2+ . That is possibly due to BC_300 has more surface oxygen-containing functional groups than BC_450. Thus, the effect of coexisting citric acid needs to be taken into account when biochar is increasingly used as an amendment in soil and water systems.
研究领域:
环境科学
·
土壤学
·
水处理工程
✓ 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）