Zhu, Lingli;
Shen, Dekui;
Liu, Qian;
Luo, Kai Hong;
Li, Chong;
(2022)
Mild Acidolysis-Assisted Hydrothermal Carbonization of Lignin for Simultaneous Preparation of Green and Blue Fluorescent Carbon Quantum Dots.
ACS Sustainable Chemistry and Engineering
, 10
(30)
pp. 9888-9898.
10.1021/acssuschemeng.2c02223.
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Abstract
Biomass waste is a renewable, cost-effective, and eco-friendly feedstock for carbon quantum dot (CQD) preparation, but its high-efficiency utilization is still a challenge. Here, we report a mild acidolysis-assisted hydrothermal strategy toward the simultaneous preparation of green and blue fluorescent CQDs from lignin. The synthesis pathway includes first the acidolysis of lignin and then hydrothermal carbonization of its supernatant and solid residue, separately. The fluorescence mechanism of the two CQDs is elucidated through the investigation of their structure, chemical composition, and optical properties combined with quantum chemistry calculations. Their formation mechanism is also explored; nuclear magnetic resonance (NMR) data demonstrate that green CQDs are derived from the side-chain scission of lignin by the bottom-up method, while blue CQDs inherit the aromatic bulk of lignin via the top-down method. The optimal yield of two CQDs can be achieved as 30.6% for green CQDs and 15.2% for blue CQDs by adjusting the acidolysis temperatures from 30 to 110 °C. This comprehensive strategy promotes the high-efficiency conversion of biomass into CQDs and provides a theoretical basis for exploring the fluorescence mechanism and formation mechanism of CQDs.
| Type: | Article |
|---|---|
| Title: | Mild Acidolysis-Assisted Hydrothermal Carbonization of Lignin for Simultaneous Preparation of Green and Blue Fluorescent Carbon Quantum Dots |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acssuschemeng.2c02223 |
| Publisher version: | https://doi.org/10.1021/acssuschemeng.2c02223 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Lignin, carbon quantum dots, simultaneous preparation, mechanism |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10157640 |
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