Preparation of Nitrogen-doped Carbon Dots and Analysis of Fe3+Detection in Pudilan Residue
Biomass carbon dots(CDs),as a new type of fluorescent carbon nanomaterials,has been widely concerned in the fields of fluorescence imaging and environmental detection due to its advantag-es of good biocompatibility and low cytotoxicity.CDs prepared from Pudilan after decocting has been wasted due to its large market demand,and there are few reports on the preparation of CDs by combin-ing various traditional Chinese medicines.To solve these problems,nitrogen doped carbon dots(N-CDs)were prepared by hydrothermal method using Pudilan residue as carbon source and triethyl-amine as nitrogen source.Firstly,combined with single factor test and orthogonal test,the optimal pro-cess conditions of N-CDs were determined as follows:Pudilan residue 1.2 g,reaction temperature 220℃,triethylamine 0.4 mL,reaction time 8 h.Secondly,the ultraviolet and fluorescence spectra of N-CDs under this condition were detected.The ultraviolet absorption peak of N-CDs was 268 nm,the optimal excitation and emission peaks were 320 nm and 412 nm,respectively,and the quantum yield was 6.48%.Finally,the morphology of N-CDs was analyzed by infrared,XRD and TME.The results show that N-CDs belong to amorphous carbon,and its surface is rich in hydroxyl,carbonyl and other functional groups,with an average particle size of 7.08 nm.In addition,the fluorescence quenching de-gree of N-CDs was linearly correlated with the concentration of Fe3+from 0.2 to 20 μmol/L.The lin-ear equation was y=0.005 98c+0.007 92(R2=0.996 9),and the detection limit was 0.31 μmol/L.This detection method has the advantages of simple operation,low cost and good selectivity.
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