木质素碳点的优化合成及用于金属离子的检测

doi:10.11896/cldb.21080027

材料导报

2023, Vol. 37

Issue (5): 21080027-6 https://doi.org/10.11896/cldb.21080027

高分子与聚合物基复合材料

木质素碳点的优化合成及用于金属离子的检测

杜鹏, 刘洁, 张静, 马婕妤, 耿艳艳, 曹丰^*

苏州科技大学化学与生命科学学院,江苏苏州 215011

Optimized Synthesis of Lignin Carbon Dots and Its Application in Metal Ions Detection

DU Peng, LIU Jie, ZHANG Jing, MA Jieyu, GENG Yanyan, CAO Feng^*

College of Chemistry and Life Science, Suzhou University of Science and Technology, Suzhou 215011,Jiangsu, China

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摘要以废弃的木质素为前驱体,采用水热法,绿色、便捷地制备了木质素碳点(L-CDs)。利用透射电子显微镜、紫外可见分光光度计、傅里叶红外光谱、荧光光谱对L-CDs形貌和光学性质进行了研究。结果表明,制备的碳点具有较小的尺寸,尺寸主要分布在2~4 nm,平均粒径为3.2 nm,其表面有大量的羟基等含氧基团,表现出良好的分散性,最大激发波长与最大发射波长分别为370 nm和469 nm。L-CDs在365 nm紫外灯的照射下发出强烈的蓝色荧光,以硫酸奎宁为参比,L-CDs的荧光量子产率为12%,与多数已报道的生物质碳点具有可比性。通过对反应条件进行优化,L-CDs对水中Fe³⁺传感灵敏,检测的线性范围为5~400 μmol/L,检测限为1.69 μmol/L,其在实际水样的检测中仍有着较高的线性相关性。L-CDs在中性及碱性环境中有较强的荧光强度,有望用于自然水样中其他有机污染物的检测。

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关键词: 木质素生物质碳点优化合成金属离子检测

Abstract: Lignin carbon dots(L-CDs)were facilely fabricated by a eco-friendly hydrothermal method using natural biomass lignin as raw material. The morphology and optical properties of L-CDs were studied by transmission electron microscopy, UV-Vis absorption spectroscopy, Fourier transform infrared spectroscopy and fluorescence spectroscopy. The results indicated that the L-CDs have a small size, which is mainly distributed in 2—4 nm with an average particle size of 3.2 nm. There are a large number of hydroxyl groups and other oxygen-containing groups on the surface of L-CDs, which are consistent with the good dispersion of the carbon dots prepared. The maximum excitation wavelength and maximum emission wavelength are 370 nm and 469 nm. L-CDs emit strong blue fluorescence under the irradiation of 365 nm ultraviolet lamp. Using quinine sulfate as a reference, the fluorescence quantum yield of L-CDs is 12%, which is comparable with most reported biomass carbon dots. By optimizing the reaction conditions, the sensitive sensing of L-CDs on Fe³⁺ in water is realized. The method showed a linear range of 5—400 μmol/L with a detection limit of 1.69 μmol/L, showing excellent sensitivity and selectivity. There is still a high linear correlation in the detection of actual water samples. Moreover, L-CDs have strong fluorescence intensity in neutral and alkaline environments, which is expected to be used for the determination of organic pollutants in natural water samples.

Key words: lignin biomass carbon dots optimized synthesis metal ions detection

出版日期: 2023-03-10 发布日期: 2023-03-14

ZTFLH:

O657.3

基金资助: 国家自然科学基金(21702143);江苏省自然科学基金(BK2017377);江苏省研究生科研与实践创新计划项目(SJCX21_1400)

通讯作者: ^*曹丰,博士,讲师,现任苏州科技大学化学生命科学学院材料化学系副主任。2005年本科毕业于南京工业大学材料科学与工程学院材料化学专业,2010年于南京工业大学材料物理与化学专业获硕士学位,2010年获工学博士学位。2010年进入苏州科技学院化学与生物工程学院材料化学教研室从事教学和科研工作。主要从事生物废弃物基功能碳材料和生物高分子材料的改性和应用研究。累计发表论文18篇,获授权专利5项,参与科研课题5项。caofeng@mail.usts.edu.cn

作者简介: 杜鹏,硕士研究生,2020年于合肥城市学院取得学士学位,同年就读于苏州科技大学,主要从事碳纳米材料的合成及其用于环境污染物检测。

引用本文:

杜鹏, 刘洁, 张静, 马婕妤, 耿艳艳, 曹丰. 木质素碳点的优化合成及用于金属离子的检测[J]. 材料导报, 2023, 37(5): 21080027-6.
DU Peng, LIU Jie, ZHANG Jing, MA Jieyu, GENG Yanyan, CAO Feng. Optimized Synthesis of Lignin Carbon Dots and Its Application in Metal Ions Detection. Materials Reports, 2023, 37(5): 21080027-6.

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http://www.mater-rep.com/CN/10.11896/cldb.21080027 或 http://www.mater-rep.com/CN/Y2023/V37/I5/21080027

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