Analytical Methods
·
2021
·Vol. 14
·期 1
·44-51
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IF 2.896
Lili Chen,Zihan Cheng,Xinyue Peng,Guoqiao Qiu,Li Wang
Nitroaromatic explosives pose a great threat to the environment and human safety. It is very important to design simple, highly efficient and multifunctional sensors for detecting nitroaromatic explosives. However, a few sensors can determine multicomponent nitroaromatic explosives simultaneously. Eu functionalized MOF-253 (Eu@MOF-253) hybrid material was synthesized using the post-synthetic modification method. The introduction of Eu3+ in MOF-253 caused the fluorescence peak of the ligand to show a distinct red-shift due to its polarization enhancement effect in the presence of 2,4-DNP. The emission and excitation spectra of the Eu@MOF-253 sensor showed overlap with the ultraviolet-visible (UV-vis) absorption spectra of the representative nitroaromatic explosives 2,4-dinitrophenol (2,4-DNP) and 2,4,6-trinitrophenol (TNP). Therefore, it is feasible to discriminate and quantify TNP and 2,4-DNP simultaneously. As proposed, the Eu@MOF-253 luminescent sensor was highly sensitive and selective towards TNP and 2,4-DNP. The other coexisting nitroaromatic explosives did not interfere with the determination. Upon addition of TNP, the fluorescence of the Eu@MOF-253 sensor decreased dramatically and showed an excellent quenching constant (Ksv) of 1.58 × 106. The fluorescence intensities of the Eu@MOF-253 sensor presented good linear relationships with concentrations of TNP and 2,4-DNP ranging from 0.01–100 μM and 0.01–25 μM, respectively. Low limits of detection (LOD) for both 2,4-DNP and TNP were approximately 10 nM. The determination mechanism is mainly ascribed to the internal filtration effect (IFE) and electron transfer. This work provides a practical method for the highly efficient determination of nitroaromatic explosives.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2020
·
IF 4.613
Yujiao Tu,Suping Wang,Xiaotian Yuan,Yingying Xiang,Kunhao Qin,Yunlin Wei,Qi Zhang,Xuemei Chen,Xiuling Ji
The blue fluorescent nitrogen, phosphorus doped carbon dots ( Tg N,P-CDs) deriving from Thelephora ganbajun Zang were successfully obtained by hydrothermal method . Tg N,P-CDs possessed excellent fluorescence features and displayed strong blue fluorescence emission at 444 nm under 356 excitation with good water solubility. Tg N,P-CDs exhibited low biotoxicity and excellent biocompatibility by live/dead bacterial differentiation, cell imaging and onion epidermal staining. Furthermore, the nanoprobes showed high selectivity and sensitivity in detecting 2,4-dinitrophenol (2,4-DNP) and 4-nitrophenol (4-NP), and excellent linear range of 0–50 μM (R 2 = 0.9923) and 0–50 μM (R 2 = 0.9926) with low detection limits of 35.09 nM and 78.62 nM for 2,4-DNP and 4-NP, respectively. The Tg N,P-CDs was successfully applied to determine 4-NP and 2,4-DNP in real water and soil samples. It revealed that the inner filter effect quenching mechanism dominated in quenching of Tg N,P-CDs fluorescent by 2,4-DNP and 4-NP. It provides a new insight on the bioimaging application and environmental pollutant detection.
研究领域:
材料科学
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环境科学
·
生物医学
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DOI
高影响因子
Journal of Central South University
·
2024
·Vol. 31
·期 1
·138-150
·
IF 3.7
Ouyang Yi-wen,Liang Jian-jun,Gao Xiao-feng
In order to efficiently remove 4-nitrophenol (4-NP) and 2,4-dinitrophenol (2,4-DNP), 4-NP and 2,4-DNP were used as template molecules and double-template magnetic molecularly imprinted polymers (D-MIPs) were prepared by surface molecular imprinting technology using itaconic acid as functional monomer, Fe 3 O 4 @SiO 2 as carrier, ethylene glycol dimethacrylate as crosslinking agent and azodiisobutyronitrile as initiator. The morphology of D-MIPs was characterized using FT-IR and SEM. The adsorption specificity, regenerability, and applicability of D-MIPs were studied in detail. The results show that D-MIPs successfully coated the surface of the Fe 3 O 4 @SiO 2 carrier and had a good polymerization effect, specific recognition sites, and good imprinting performance, with a diameter of 90 nm and homogeneous shape. The theoretical adsorption capacities of 4-NP-MIPs, 2, 4-DNP-MIPs, and D-MIPs for target molecules were 103.97, 73.14 and 123.99 mg/g, respectively. There were many adsorption sites with different adsorption energies. D-MIPs reached the optimal adsorption equilibrium state in 30 min. The best fitting models for the MIPs were the Freundlich adsorption and pseudo-second-order kinetic models, indicating that adsorption of MIPs occurred via a chemical adsorption process. Test results show that MIPs had highly specific recognition and selective adsorption capacity in different water samples. After eight regeneration cycles, the adsorption capacity of D-MIPs decreased by 7.51%, confirming that MIPs had excellent regeneration.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Ji-Min Yang,Yun-Kai Kou
Metal-organic framework-based composites can help overcome the functional shortcomings of single materials by virtue of the synergetic properties of their components. The new functionalities introduced in the resulting material allow for their use in a wide range of applications. Herein, we prepared a fluorescent amino-CQDs@MIL-101-SO 3 H composite sensor by immobilizing amino-functionalized carbon quantum dots (amino-CQDs) on sulfo-modified MIL-101 nanoparticles. MIL-101-SO 3 H was not only used as a carrier to encapsulate the amino-CQDs in the pore cavity by hydrogen bonding interactions between the free -SO 3 H groups of MIL-101-SO 3 H and the –NH 2 group of the amino-CQDs, but also as an adsorbent to selectively adsorb and capture the target analyte, i.e. 2,4-dinitrophenol (DNP), via hydrogen bonding interactions between the free -SO 3 H groups of MIL-101-SO 3 H and the –NO 2 group of DNP. The amino-CQDs were used as a probe to sense the target molecules with high selectivity. The amino-CQDs@MIL-101-SO 3 H composite sensor displayed excellent selectivity and sensitivity toward DNP, with a detection limit of 0.041 μM. This is the first study to demonstrate the immobilization of fluorescent amino-CQDs in mesostructured MIL-101-SO 3 H. The selective fluorescence detection demonstrated herein will provide a new platform for sensing hazardous pollutants.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2022
·
IF 2.267
Lanying Xu,Yingying Huang,Bingshan Zhao,Limin Ren,Tao Long
β-Cyclodextrin modified magnetic microspheres were synthesized and used as an effective adsorbent for the solid-phase extraction of three phenols from water samples. Scanning electron microscopy and Fourier transform infrared spectrometry were used to characterize the adsorbents. The major parameters affecting the extraction and desorption efficiencies, such as adsorbent dosage, extraction time, pH, ionic strength, and eluent type were systematically optimized. Under these conditions, three phenols in water samples were extracted and determined by high performance liquid chromatography (HPLC) with diode array detection (DAD). Limits of detection (LODs) of 0.04–0.34 ng mL−1 and limits of quantification (LOQs) from 0.13 to 1.14 ng mL−1 were achieved with good repeatability (relative standard deviation <7.5%). The developed method was applied for the determination of 2,4-dichlorophenol, 2,4-dinitrophenol and bisphenol A in spiked Yangtze River water, and the recoveries were from 81.0% to 94.9%. The results demonstrated that the combination of magnetic solid-phase extraction (MSPE) with HPLC-DAD is suitable for the determination of trace phenolics in environmental water.
研究领域:
环境科学
·
分析化学
·
水质分析
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DOI
高影响因子
危险品化学品经营许可证（带存储）