木质素分子量对碳量子点形成及性能的影响,Green Chemistry

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木质素分子量对碳量子点形成及性能的影响
Green Chemistry ( IF 9.3 ) Pub Date : 2024-01-13 , DOI: 10.1039/d3gc04694j
Xiaoli Liu ₁ , Siyu Zhao ₁ , Xinrui Chen ₁ , Xing Han ₁ , Junhua Zhang ₂ , Min Wu ₁ , Xueping Song ₁ , Zhanying Zhang ₃

Affiliation

一般认为，木质素基碳量子点(L-CQDs)的形成包括木质素解聚和再聚合。然而，详细的机制尚未得到很好的理解。本研究通过研究木质素分子量对L-CQDs性能的影响来阐明L-CQDs的形成机制。首先，采用连续有机溶剂沉淀法将碱性木质素依次分馏成分子量范围为7100-2000的五个木质素样品。然后，用这五个木质素级分制备五个L-CQD，编号为1至5，分别对应于木质素级分从高到低。与由原始碱性木质素制备的L-CQDs-0相比，由中间分子量为5042 g mol ^{-1 的}木质素级分制备的L-CQDs-3的荧光强度增加了1.86倍。^{结果发现，该分子量为5042 g mol -1}的木质素馏分可以解聚成大量香草醛和苯甲醛（2,4-二羟基-6-甲基）单元。这些低分子量单元可以很容易地形成高度共轭的碳核结构，从而提高L-CQDs-3的荧光性能。此外，本研究证实了L-CQDs-3在L02、HepG2和大肠杆菌细胞中具有优异的成像能力。该研究不仅补充了现有的L-CQD形成机制，而且为制备具有高荧光性能的L-CQD提供了一种简单的方法。

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The effect of lignin molecular weight on the formation and properties of carbon quantum dots

It is generally believed that the formation of lignin-based carbon quantum dots (L-CQDs) includes lignin depolymerization and repolymerization. However, the detailed mechanism has not been well understood. In this study, the effect of lignin molecular weight on the properties of L-CQDs is studied to elucidate the formation mechanism of L-CQDs. Firstly, alkaline lignin is sequentially fractionated into five lignin samples with a molecular weight range of 7100–2000 using a continuous organic solvent precipitation method. Then, the five lignin fractions are used to prepare five L-CQDs numbered from 1 to 5, corresponding to the lignin fractions from high to low, respectively. L-CQDs-3 that was prepared from the lignin fraction with an intermediate molecular weight of 5042 g mol⁻¹ has a 1.86-fold increase in fluorescence intensity compared to the L-CQDs-0 prepared from pristine alkaline lignin. It is found that this lignin fraction with a molecular weight of 5042 g mol⁻¹ can depolymerize into a large number of vanillin and benzaldehyde (2,4-dihydroxy-6-methyl) units. These low molecular weight units can easily form highly conjugated carbon core structures, thus improving the fluorescence performance of L-CQDs-3. In addition, the present study confirms the excellent imaging ability of L-CQDs-3 in the L02, HepG2 and Escherichia coli cells. This study not only supplements the existing L-CQD formation mechanism, but also provides a simple method for the preparation of L-CQDs with high fluorescence performance.

更新日期：2024-01-13

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