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Biomass Chemical Engineering ›› 2022, Vol. 56 ›› Issue (3): 9-15.doi: 10.3969/j.issn.1673-5854.2022.03.002

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A New Carbon-based Optical Sensor for Detecting Silver Ion in Environmental Water

Yun HU1, Zhongyong CHEN2, Xinji ZHOU2,*(), Meihong LIU1, Xi ZHOU1,2   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; National Engineering Lab. for Biomass Chemical Utilization; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administraction; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
    2. School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China
  • Received:2021-10-21 Online:2022-05-30 Published:2022-05-21
  • Contact: Xinji ZHOU E-mail:zhouxi1123nju@foxmail.com

Abstract:

Lignin-based carbon quantum dots(CQDs) were prepared with calcium lignosulfonate as precursor by molecular self-assembly and ultrasound-assisted method at room temperature. The effects of calcium lignosulfonate and NaBH4 on the fluorescence property of CQDs were studied, and the synthesis condition of CQDs was also optimized. The optimal preparation conditions were as follows: the mass concentration of calcium lignosulfonate was 60 g/L, the mass concentration of reducing agent NaBH4 was 50 g/L. The structural morphology and optical properties of CQDs were confirmed by transmission electron microscopy(TEM), infrared spectroscopy(FT-IR), X-ray photoelectron spectroscopy(XPS), UV-visible spectroscopy(UV-vis), and fluorescence spectroscopy(FL). The experimental results showed that CQDs had small particle size((9.5±0.5)nm), uniform distribution, no agglomeration phenomenon, excellent optical properties, and fluorescence quantum yield of 12.4%. In addition, CQDs were used to investigate the effect of different silver ion concentrations on the fluorescence intensity. The results showed that CQDs had good fluorescence recognition and sensitivity to Ag+, with a linear detection range(R2=0.998) of 0-250 μmol/L and a detection limit of 525 nmol/L. Meanwhile, CQDs fluorescence showed excellent selectivity and low cytotoxicity, which was expected to show potential application value in biosensing and environmental detection fields.

Key words: carbon nanodots, fluorescence properties, detection of Ag+

CLC Number: