Fluorescence Enhancement of Lignin-Based Carbon Quantum Dots by Concentration-Dependent and Electron-Donating Substituent Synergy and Their Cell Imaging Applications

Zhao, Siyu; Chen, Xinrui; Zhang, Caixia; Zhao, Peitao; Ragauskas, Arthur J.; Song, Xueping

doi:10.1021/acsami.1c20648

Fluorescence Enhancement of Lignin-Based Carbon Quantum Dots by Concentration-Dependent and Electron-Donating Substituent Synergy and Their Cell Imaging Applications

Journal Article · Mon Dec 13 23:00:00 EST 2021 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.1c20648· OSTI ID:1843670

Zhao, Siyu ^[1]; Chen, Xinrui ^[1]; Zhang, Caixia ^[1]; Zhao, Peitao ^[2]; ^[3]; ^[1]

Guangxi Univ., Nanning (China); Guangxi Key Lab. of Clean Pulp & Papermaking and Pollution Control, Nanning (China)
China Univ. of Mining and Technology, Xuzhou, Jiangsu (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Black liquor is an important pollutant in the pulp industry, but it also has the potential for high-value utilization. In this study, lignin extracted from black liquor was hydrothermally prepared into lignin-based carbon quantum dots (L-CQDs) using a one-pot method. Physicochemical characterization suggested that the L-CQDs exhibited a lamellar core–shell multilayered graphene structure surrounded by oxygen-containing functional groups. Here, the fluorescence intensity of the L-CQDs was strengthened depending on their own concentration dependence and the doping of external groups. The fluorescence intensity of L-CQDs varied between 89.09 and 183.66 under different concentrations, and the most intense fluorescence (183.66) was obtained at 0.1 mg mL^–1. At hydroxyl and amino adsorption capacities of 11.08 and 0.98 mmol g^–1, the hydroxylated RL-CQDs-5 and aminated NL-CQDs-3 exhibited the highest fluorescence intensities at 689.22 and 605.39, respectively. Moreover, when pristine L-CQDs were sequentially aminated and hydroxylated, the NRL-CQDs’ fluorescence intensity reached 1224.92. Cell imaging experiments proved that cells cultivated with NRL-CQDs have brighter fluorescence compared with L-CQDs. The results will render L-CQDs more suitable for practical applications.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Natural Science Foundation of China (NSFC); Natural Science Foundation of Guangxi Province; Guangxi University

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1843670

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 51 Vol. 13; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
black liquor lignin
carbon quantum dots
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Fluorescence Enhancement of Lignin-Based Carbon Quantum Dots by Concentration-Dependent and Electron-Donating Substituent Synergy and Their Cell Imaging Applications

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