研究目的
To design and synthesize a sensitive and selective luminescent metal-organic framework (MOF) for the detection of Fe3+, Cd2+ ions and CH2Cl2 molecules.
研究成果
TMU-16 serves as an efficient multifunctional luminescent sensor for selective detection of Fe3+ (via quenching), Cd2+ (via enhancement), and CH2Cl2 (via enhancement) with high sensitivity, low detection limits (0.2 μM for Fe3+, 0.5 μM for Cd2+), fast response (<1 min), and good recyclability. The azine-functionalized pores facilitate specific interactions, making it a promising material for practical sensing applications in environmental and biological contexts.
研究不足
The framework exhibits slight changes in PXRD patterns when immersed in metal ion solutions, indicating potential structural flexibility or deformation. The Stern-Volmer plot for CH2Cl2 becomes nonlinear at higher concentrations, suggesting limitations in quantitative sensing at high analyte levels. The study is limited to in vitro conditions and specific solvents (e.g., DMF), which may not fully represent real-world environmental samples.
1：Experimental Design and Method Selection:
The study involved the synthesis of a Zn(II)-based MOF (TMU-16) using solvothermal methods with specific ligands (H2BDC and 4-bpdh). Fluorescence measurements were conducted to assess sensing capabilities towards metal ions and solvents. Theoretical models like Stern-Volmer equation were used for quantitative analysis.
2：Sample Selection and Data Sources:
TMU-16 was synthesized from Zn(NO3)2·6H2O, H2BDC, and 4-bpdh. Metal ion solutions (e.g., Fe3+, Cd2+) were prepared from salts like Fe(NO3)3·9H2O and CdCl2·2.5H2O. Solvents included DMF, CH2Cl2, MeOH, EtOH, THF, and CH3CN.
3：5H2O. Solvents included DMF, CH2Cl2, MeOH, EtOH, THF, and CH3CN.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a Shimadzu RF-6000 fluorescence spectrometer, Nicolet Fourier Transform IR spectrometer, Philips X’pert diffractometer, and TGA apparatus. Materials included Zn(NO3)2·6H2O, H2BDC, 4-bpdh, DMF, various metal salts, and organic solvents from suppliers like Sigma-Aldrich and Merck.
4：Experimental Procedures and Operational Workflow:
TMU-16 synthesis involved heating mixtures at 115°C for 72 h. For sensing, TMU-16 dispersions in DMF were treated with metal ions or solvents, ultrasonicated for 15 min, and fluorescence spectra recorded. Regeneration involved centrifuging and washing with DMF.
5：Data Analysis Methods:
Fluorescence intensity changes were analyzed using Stern-Volmer plots. Detection limits were calculated using the IUPAC equation (3Sb/KSV). XRD and FT-IR were used for structural characterization.
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