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The Synthesis And Application Of Colorimetric Sensors For Heavy Metal Ions Based On 1-naphthylamine And Phenothiazine

Posted on:2016-04-05Degree:MasterType:Thesis
Country:ChinaCandidate:W LuoFull Text:PDF
GTID:2428330482973975Subject:Organic Chemistry
Abstract/Summary:PDF Full Text Request
Nowadays,the problem of pollution become more and more serious with the society development.Efficient detection of these ions have attracted more and more attention.Current detection methods mainly draw support from atomic absorption spectrometry,cold atomic fluorescence spectrum,gas chromatography,fluorescence spectrum and UV-Vis.Among these methods,fluorescence spectrometry and UV-Vis spectrum are favored due to the simple,rapid and sensitive nature.However,compared to fluorescence spectrometry,UV-Vis spectrum has the advantage of naked-eye detection.Besides,it doesn't need expensive testing device,which has stronger applicability.In this paper,we synthesized several simple organic small molecules for detection of heavy metal ions.Their photophysical properties as well as the detection behaviors were studied by the UV-Vis spectra.The contents of the thesis include four parts as shown below:In the first chapter,the detection principles of fluorescence sensor and chromophore chemsensor were explained.The research progress of chemsensors for Cu2+?Ag+and Hg2+ in recent years were also summarized.At last,the research ideas of the topic were put forward.The second chapter described the study of colorimetric sensor for Cu2+.A simple Schiff base L was synthesized from 1-naphthylamine and 4-diethylaminosalicylaldehyde.The structure of L was determined by 1H NMR?13C NMR?MS and element analysis.Detection behavior of the compound L was studied by UV-Vis absorption spectra.The sensor shows high sensitivity and selectivity to Cu2+ with detection limit of 0.224 ?M in EtOH/H2O(v/v,1:1)solution.It's note worthy that the detection limit is lower than the highest contents of copper in drinking water(31.5 ?M)set up by WHO.In the third part,a novel reaction-based probe for Hg2+ was synthesized from phenothiazine.Its selectivity to different metal ions in CH3CN/H2O solution was studied by UV-Vis absorption spectra.We found that Hg2+ was the only one that takes positive effect when added to the CH3CN/H2O solution of the probe.Dramatic color change from colorless to yellow was observed,suggesting that naked-eye identification for Hg2+ realized.Furthermore,this probe can be used in test strip to detect Hg2+,which made it feasible for application in real samples.In the fourth part,a simple schiff base probe X was synthesized from 2-nitrophenol and phenotniazine.It was applied to detect Ag+ in ethanol solution.The solution color of X was changed significantly from colorless to light red when the Ag+ ion was added.Meanwhile,the interference experiments with the coexistent ions were studied,and result showed that all of the other metal ions had no obvious interference with the detection of Ag+.
Keywords/Search Tags:fluorescent chemsensors, colorimetric sensor, Schiff base, 1-naphthylimino, phenothiazine
PDF Full Text Request
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