MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Ma-Lin Cui,Guo-Shi Zhang,Ze-Wen Kang,Xiao-Yan Zhang,Qing-Fan Xie,Miao-Ling Huang,Bing-Qing Wang,Da-Peng Yang
A facile strategy was proposed for the preparation of two fluorescent iridium nanoclusters of IrNCs-1 and IrNCs-2 by heating IrCl 3 in N, N -dimethylacetamide (DMA) and N -Methylformanilide (MFA), respectively. The DMA and MFA are amide compounds and contain electron-rich oxygen and nitrogen atoms. They can be used as electron donors and a fraction of electron charge was transferred to Ir atom to form ligand-to-metal charge transfer (LMCT) complexes. The Ir atoms can be stabilized in LMCT complexes via accepting and localizing the electron density. These LMCT complexes with excellent fluorescent property were defined as the IrNCs. They exhibited obvious excitation wavelength-dependent emission behavior. The emission bands of two IrNCs showed red-shifting with the increasing of excitation wavelength based on the effect of “inhomogeneous broadening”. The IrNCs-1 possessed concentration-dependent emission behavior. With the decreasing of IrNCs-1 concentrations, the fluorescence spectra showed remarkable blue-shifting due to the destruction of intermolecular hydrogen bonds between IrNCs-1. In the presence of p-nitroaniline (p-NA), the fluorescence of IrNCs-1 was significantly quenched and the fluorescence bands red-shifted strongly. According to the Stern-Volmer quenching behavior under different reaction temperature and absorbance spectra of IrNCs-1 in the presence and absence of p-NA, the dynamic quenching mechanism was included. Based on these findings, the fluorescence sensor for p-NA determination was developed with the linear range of 0.1–40 μM and the limit of detection (LOD) of 50 nM. The proposed sensor was successfully applied in the p-NA determination of tap water and lake water samples, suggesting that the novel IrNCs will be a promising candidate as a luminescence sensor.
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
BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Xing Lu,Yiwen Yang,Yanbo Zeng,Lei Li,Xiaohua Wu
Rapid and efficient detecting trace amount of environmental p -nitroaniline ( p -NA) is in urgent need for security concerns and pollution supervision. In this work we report the use of molecularly imprinted polymeric ionic liquid (MIPIL) microspheres to construct recognizable surfaces for detection of p -NA through fluorescence quenching . The p -NA imprinted microspheres are synthesized by precipitation polymerization upon co-polymerization of 3-(anthracen-9-ylmethyl)-1-vinyl-1H-imidazol-3-ium chloride (Fluorescent IL monomer) with ethyleneglycol dimethacrylate (EGDMA). The electron-rich group alkenyl imidazole in IL functional monomer can dramatically improve the emission of anthracene fluorophore and the π-π stacking, electronic, and hydrogen bond between p -NA and MIPIL can efficiently enhance the selective recognition force. The as-synthesized MIPIL microspheres present spherical shape, high fluorescence emission intensity and specific recognition, which showed rapid detection rate (1 min), stable reusable property (at least 4 time recycles), wonderful selectivity over several structural analogs, wide linear range (10 nM to 10 M) with a correlation coefficient of 0.992, and excellent sensitivity (LOD, 9 nM). As synthesis and surface functionalization of MIPIL microspheres are well established, the methods reported in this work are facile, rapid and efficient for monitoring p -NA in environmental wastewater.
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
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Xiang Liu,Tiantian Zhao,Heming Cheng,Chaoqun Zhu,Shun Li,Ping Cui
An approach of loading nanomagnetites (NMs), obtained by in-situ synthesis, on graphite oxides (GO) or poly(amidoamine)-modified GO (pGO) was described in detail in this work. Compared with the GO-NM, the pGO-NM hybrids performed excellent catalysis on degradation of aqueous p-nitroaniline in surrounding air and aqueous medium with a mechanical agitation without light irradiations and additional hydrogen peroxides. These properties differed tremendously from those of most reported metallic oxide-GO hybrids. The catalytic decomposing of the p-nitroaniline was recorded by the successive measurements of an ultraviolet–visible spectrometer. The chemical modifications on GO were investigated with infrared and X-ray photoelectron spectrometers. The hybrids of GO-NM and pGO-NM are estimated with ultraviolet–visible spectrometer, X-ray diffraction, transmission electron microscopy, cyclic voltammetry measurements and thermogravimetric analyses. The experimental results showed that the dissolved oxygen and water were involved in the degradation, which provided solid evidences for the mechanism discussion.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 7
·1-11
·
IF 5.3
Li Huiru,Tian Yanbo,Tan Liju,Wang Na,Qiao Yu,Wang Jiangtao
A novel molecularly imprinted ratiometric fluorescent sensor CQDs@MIP/FITC@SiO 2 for the detection of p-nitroaniline (p-NA) was constructed through the mixture of CQDs@MIP and FITC@SiO 2 in the ratio of 1:1 ( V CQDs@MIP : V FITC@SiO₂ ). The polymers of CQDs@MIP and FITC@SiO 2 were prepared by sol-gel method and reversed-phase microemulsion method, respectively. CQDs@MIP was used as the auxiliary response signal and FITC@SiO 2 was used as the reference enhancement signal. The signal was measured at excitation/emission wavelengths of 365/438, 512 nm. The sensor showed good linearity in the concentration range 0.14–40.00 µM ( R 2 = 0.998) with a detection limit of 0.042 µM for p-NA. The color change of “blue-cyan-green” could be observed by the naked eye under 365 nm UV light, thus realizing the visual detection of p-NA. The sensor presented comparable results compared with high-performance liquid chromatography (HPLC) method for the detection of p-NA in hair dye paste and aqueous samples with recoveries of 96.8–103.7% and 95.8–104.4%, respectively. It was demonstrated that the constructed sensor possesses the advantages of simplicity, excellent selectivity, superior sensitivity, and outstanding stability. Graphical Abstract
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Shaona Chen,Mengke Bu,Xinyu You,Zhongxu Dai,Jinjin Shi
We report a novel surface-enhanced Raman scattering (SERS) substrate for detecting p -nitroaniline (PNA) in real water samples, which possesses excellent sensitivity, good selectivity, and high SERS activity. Specifically, the uniform distribution structure of defect-graphene/Ag (DG/Ag) is obtained by acid etching graphene loading silver nanoparticles. The Molecularly imprinted polymer (MIP) film is copolymerized on the surface of DG/Ag by function monomer, crosslinker and template of PNA. A DG/Ag-MIP SERS substrate is obtained through polymerization of molecular imprinted polymer (MIP) on defect-graphene/Ag (DG/Ag) supporting materials . Our results signify that this new SERS substrate reveals excellent performance for PNA with an enhancement factor of 2.42 × 10 7 . Moreover, DG/Ag-MIP substrate exhibits outstanding capability to detect PNA molecules with detection limit approximately reaching 1.0 × 10 −14 M. These experimental results imply that the DG/Ag-MIP SERS substrate possesses potential application for sensing detection of PNA in environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yangmei Qin,Shizhao Jian,Ke Bai,Yuyang Wang,Zenghui Mai,Senqing Fan,Boya Qiu,Yu Chen,Yinan Wang,Zeyi Xiao
With the PTFE membrane as the substrate, a novel Ag-based catalytic membrane reactor (CMR) was fabricated by deep-permeation synthesis fabrication (DPSF). In DPSF, ZIF-8 was first assembled inside the membrane pores by permeation flow and the depositing reaction of Zn2+, and 2-methylimidazole solutions flow through the membrane synergistically. Then, Ag was reduced inside the pores impregnating ZIF-8 nanoclusters by Ag+ and reductant solutions flowing through the membrane similarly. The TEM images of the cross-sectional membrane exhibited the composite nanoparticles of Ag+ZIF-8 with good dispersion and size distribution (10–50 nm). The as-synthesized (Ag+ZIF-8)@PTFE was applied to the catalytic reduction of p-nitroaniline to p-phenylenediamine in a continuous flow-through reactor and presented remarkable catalyzing performance. The maximal apparent reaction rate constant is 3–4 orders of magnitude higher than that reported with good stability.
研究领域:
材料科学
·
催化化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Yujuan Cao,Song Wang,Wei Wu,Hong Peng,Ying Yu,Debin Zhu
An efficient fluorescent probe based on cucurbit[6]uril modified CdTe quantum dots (CB[6]@QDs) was prepared. This novel probe showed significant and selective fluorescence quenching and complexation capacity to p-nitroaniline, its interaction mechanism was studied by both experimental and theoretical methods. Furthermore, a fluorescent method was developed for the determination of p-nitroaniline in different environmental samples. The fluorescence intensity of CB[6]@QDs showed a good linearity response to p-nitroaniline in the concentration range of 2.5 × 10 −7 -3.0 × 10 −6 mol/L with a correlation coefficient (R 2 ) of 0.9976, the limit of detection (LOD) was 6 × 10 −8 mol/L and the limit of quantification (LOQ) was 2 × 10 −7 mol/L. Moreover, about 0–1.5 × 10 −6 mol/L p-nitroaniline were determined in environmental samples, the recoveries were in the range of 88–109% with the relative standard deviations (n = 3) of 1.2–4.5%. Compared with previous fluorescent methods, the present method shortened and simplified the sample pretreatment as well as enhanced the sensitivity and selectivity of analytical method. No further sample pretreatment procedure is needed and the LOD of present method was one order of magnitude less than previous fluorescent methods, showed it is a simple, selective and sensitive method.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Yan-Xia Zhang,Yi-Da Zhang,Yan-Ping Shi
Most of the traditional matrices cannot simultaneously image multiple lipids and phytohormones, so screening and discovery of novel matrices stand as essential approaches for broadening the application scope of matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI). In this work, 12 organic small molecule compounds were comprehensively screened and investigated as potential MALDI matrices for simultaneous imaging analysis of various lipids and phytohormones. In the positive ionization mode, p-nitroaniline, m-nitroaniline, and 2-aminoterephthalic acid displayed good performance for the highly sensitive detection of lysophosphatidylcholines (LPCs), phosphatidylcholines (PCs), and triacylglycerols (TGs). Furthermore, p-nitroaniline possessed excellent characteristics of strong ultraviolet absorption and homogeneous cocrystallization, making it a desirable matrix for MALDI-MSI analysis of eight plant hormones. Compared with conventional matrices (2,5-dihydroxybenzoic acid (DHB), α-cyano-4-hydroxycinnamic acid (CHCA), and 9-aminoacridine (9-AA), the use of p-nitroaniline resulted in higher ionization efficiency, superior sensitivity, and clearer imaging images in dual polarity mode. Our research offers valuable guidance and new ideas for future endeavors in matrix screening.
研究领域:
分析化学
·
植物学
✓ 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）