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Preparation of Alkali Lignin Carbon Dots and Study on Fe3+ Detection Performance
Received:November 04, 2021  
DOI：10.11980/j.issn.0254-508X.2022.04.006
Key Words:alkali lignin  ethylenediamine  carbon dots  fluorescence quenching  Fe3+ ion detection
Fund Project:福建省自然科学基金面上项目（2021J01101）；福建省高等学校新世纪优秀人才支持计划项目（NCETFJ）；福建农林大学科技创新专项基金（CXZX2019114S）。
Author NameAffiliationPostcode
REN Shiming College of Material Engineering， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350002
National Forestry and Grassland Administration Key Lab of Plant Fiber Functional Materials， Fuzhou， Fujian Province， 350002 		350002
ZHENG Zuyang Department of Forensic Sciences， Fujian Police College， Fuzhou， Fujian Province， 350007 350007
HAN Chunhui College of Material Engineering， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350002
National Forestry and Grassland Administration Key Lab of Plant Fiber Functional Materials， Fuzhou， Fujian Province， 350002 		350002
LI Yaoyao College of Material Engineering， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350002
National Forestry and Grassland Administration Key Lab of Plant Fiber Functional Materials， Fuzhou， Fujian Province， 350002 		350002
ZHUANG Jiandong* College of Material Engineering， Fujian Agriculture and Forestry University， Fuzhou， Fujian Province， 350002
National Forestry and Grassland Administration Key Lab of Plant Fiber Functional Materials， Fuzhou， Fujian Province， 350002 		350002
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Abstract:Lignin-based carbon dots （ALE-CDs） were synthesized via a simple， green and efficient hydrothermal method， using alkali lignin （AL） as carbon source， ethylenediamine （EDA） as passivator and hydrogen peroxide （H2O2） as oxidant. The optimal preparation process of ALE-CDs was optimized by single factor experiment using fluorescence performance as the index. It was found that the ALE-CDs were rich in functional groups on surface， such as hydroxyl （—OH）， carboxyl （—COOH） and amino （—NH2）， and showed excellent dispersion and stability in water. The fluorescence quantum yield and lifetime were 19.20% and 6.03 ns， respectively. Using ALE-CDs as fluorescent probes to detect different metal ions， it was found that ALE-CDs showed good selectivity for Fe3+， and the fluorescence intensity had a good linear relationship with the Fe3+ concentration （0~50 μmol/L）， and the detection limit of Fe3+ could reach 1.66 μmol/L.
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