Welcome to Chemistry and Industry of Forest Products,

Chemistry and Industry of Forest Products ›› 2018, Vol. 38 ›› Issue (5): 30-36.doi: 10.3969/j.issn.0253-2417.2018.05.005

Previous Articles     Next Articles

Preparation of Lignin Based Carbon Quantum Dots and Their Application in Fe3+ Detection

GAO Xuexia1,2, ZHOU Xi1,2, LIU Meihong1,2, WANG Chunpeng1,2, CHU Fuxiang1,2   

  1. 1. Research Institute of Forestry New Technology, CAF, Beijing 100091, China;
    2. Institute of Chemical Industry of Forest Products, CAF;National Engineering Lab. for Biomass Chemical Utilization;Key and Open Lab. of Forest Chemical Engineering, SFA;Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
  • Received:2018-06-05 Online:2018-10-25 Published:2018-11-06

Abstract: Carbon quantum dots (CQDs) were prepared from alkali lignin by hydrothermal reaction in presence of strong acid, and the synthesis conditions were optimized.The results showed that the optimal synthesis conditions were the dosage of alkali lignin 1.3 g, reaction temperature 180℃, reaction time 12 h, the dosage of NaBH4 1.3 g. The morphology and size of CQDs were characterized by transmission electron microscopy (TEM) and laser particle size analysis (DLS). The results showed that CQDs had good dispersion and uniform size distribution, and the average particle size was about 3.5 nm. The structure and composition of CQDs were characterized by infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), which indicated that the surface of CQDs contained a large number of hydroxyl, carboxyl and other oxygen-containing functional groups. In addition, the optical properties of CQDs were characterized by ultraviolet visible spectroscopy (UV-vis) and fluorescence spectra(FL), and the fluorescence quantum yield was 17.3%. Using CQDs as probe, it was used to detect Fe3+ by colorimetric method. The results showed that CQDs had good selectivity to Fe3+, its detection range was 0-400 μmol/L, and the detection limit could reach 0.136 μmol/L. At the same time, the low cytotoxicity of the CQDs made them having potential applications in biological medicine.

Key words: carbon quantum dots, fluorescence properties, colorimetric method, detection of Fe3+

CLC Number: