TANG Ding-chu,LU Yuan,FENG Wei-liang,et al.Detection of Cr(Ⅵ) and Hg(Ⅱ) by Fluorescent Carbon Dots Based on Polyester-Cotton Blended Fabrics[J].Journal of Instrumental Analysis,2024,43(03):440-446.
TANG Ding-chu,LU Yuan,FENG Wei-liang,et al.Detection of Cr(Ⅵ) and Hg(Ⅱ) by Fluorescent Carbon Dots Based on Polyester-Cotton Blended Fabrics[J].Journal of Instrumental Analysis,2024,43(03):440-446. DOI: 10.12452/j.fxcsxb.23101101.
Detection of Cr(Ⅵ) and Hg(Ⅱ) by Fluorescent Carbon Dots Based on Polyester-Cotton Blended Fabrics
In this study,two types of fluorescent carbon dots were synthesized through solvothermal method by using waste polyester-cotton blended textile as the carbon source,in ethylene glycol and sulfuric acid solutions,respectively,to achieve the detection of Cr(Ⅵ) and Hg(Ⅱ) in solution. The morphology and structure composition of the carbon dots was analyzed by transmission electron microscope and infrared spectroscopy,and the electronic transition forms,optimal excitation wavelength,optimal emission wavelength,and luminescence types of the carbon dots were analyzed by UV-visible spectrophotometer and fluorescence spectrophotometer. Then,the detection performance of the two carbon dots was studied. The carbon dots obtained in the ethylene glycol system(named ETCCDs) could selectively detect Cr(Ⅵ),with a minimum detection limit of 0.093 mg/L and the detection mechanism was fluorescence internal filtration effect. The carbon dots prepared in the sulfuric acid system(named WTCCDs) could selectively detect Hg(Ⅱ) with a detection limit of 0.018 µmol/L,and the detection mechanism was caused by energy transfer. Furthermore,Cr(Ⅵ) and Hg(Ⅱ) in actual water samples were detected,verifying the practicality of these two carbon dots. The fluorescent carbon dots designed based on polyester cotton blended fabrics not only achieve the detection of two heavy metal ions,but also provide reference significance for the regeneration and utilization of waste textiles.
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