基于木质纤维原料预水解过程同步合成碳纳米点

doi:10.3969/j.issn.0253-2417.2020.03.008

摘要/Abstract

摘要：

在桉木片热水预水解过程中加入少许尿素，得到热水预水解液，并对预水解液（PHL）进行分析研究，结果显示：在不影响预水解效果的前提下，预水解液呈现出显著的荧光性能，并呈现出浓度猝灭和激发波长依赖性质。X射线衍射（XRD）和拉曼光谱结果证实预水解液中含有石墨碳结构，经透射电镜（TEM）和原子力显微镜（AFM）分析进一步验证了石墨碳以碳纳米点（CNDs）的形式存在，CNDs的量子产率为19.43%。采用XPS和FT-IR对CNDs的结构和成分进行了表征，结果显示：CNDs表面富含羟基、羧基、氨基等官能团，CNDs成功掺杂了N原子，并且pH值在3.67~9.42时，荧光强度较为稳定，CNDs具有两种发光来源，平均寿命为3.07 ns。

关键词: 预水解液, 碳纳米点, 木质纤维, 荧光性能

Abstract:

During the process of hot water pre-hydrolysis of eucalyptus wood chips, a tiny amounts of urea was added to obtain the hot water pre-hydrolysis liquor.The produced pre-hydrolysis liquor(PHL) showed excellent fluorescence with the properties of concentration quenching and excitation wavelength dependence. The existence of graphite carbon structure in the pre-hydrolysis liquor was confirmed by X-ray diffraction (XRD) and Raman spectroscopy. The analysis of transmission electron microscopy (TEM) and atomic force microscopy (AFM) confirmed that graphite carbon existed in the form of carbon nanodots (CNDs) and the quantum yield was 19.43%. Furthermore, the structure and composition of CNDs were characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). The results showed that the surface of CNDs was rich in functional groups such as hydroxyl, carboxyl and amino groups, CNDs were successfully doped with N element, and the fluorescence intensity of CNDs was relatively stable when the pH value was 3.67-9.42.The average life of CNDs was 3.07 ns.

Key words: pre-hydrolysis liquor, carbon nanodots, lignocellulose, fluorescence properties

中图分类号:

TQ351.3

李顺利,刘玉,黄飞,刘凯,陈洪雷. 基于木质纤维原料预水解过程同步合成碳纳米点[J]. 林产化学与工业, 2020, 40(3): 61-68.

Shunli LI,Yu LIU,Fei HUANG,Kai LIU,Honglei CHEN. Synchronous Synthesis of Carbon Nanodots Formed on Pre-hydrolysis of Lignocellulose[J]. Chemistry and Industry of Forest Products, 2020, 40(3): 61-68.

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预水解液 PHL	pH值 pH value	总糖/(g·L^-1) total saccharide	低聚糖/(g·L^-1) oligosaccharide	单糖/(g·L^-1) monosaccharide	木质素/(g·L^-1) lignin
未掺杂尿素without urea	3.21	15.56	11.79	3.77	7.52
掺杂尿素with urea	3.38	16.18	11.82	4.36	7.41

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