Zhu, Lingli;
Shen, Dekui;
Hong Luo, Kai;
(2023)
Lignin-derived carbon quantum dots-decorated Bi7O9I3 nanosheets with enhanced photocatalytic performance: Synergism of electron transfer acceleration and molecular oxygen activation.
Applied Surface Science
, 608
, Article 155273. 10.1016/j.apsusc.2022.155273.
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Abstract
The design and development of high-efficient photocatalysts are confined by the limited light-harvesting capacity and rapid electron-hole recombination. The Bi7O9I3 nanosheets decorated by lignin-derived carbon quantum dots (CQDs) were prepared through a facile hydrothermal process, which was applied for the photocatalytic degradation of tetracycline hydrochloride (TC). The prepared CQDs/Bi7O9I3 composite with 3% CQDs content (CQDs/Bi7O9I3-3) showed the optimal photocatalytic degradation efficiency of 100% for TC under 300 W Xe lamp irradiation within 45 min. The corresponding degradation rate was 0.08133 min−1, which was 4.74 times higher than that of pure Bi7O9I3. The superoxide radicals (radical dotO2−) and holes (h+) were identified as the key reactive species for TC degradation through the photocatalytic mechanism exploration. The photocatalytic activity of CQDs/Bi7O9I3-3 composite could maintain above 80% after five recycles of degradation reaction, signifying its outstanding stability and reusability. The superior photocatalytic performance of CQDs/Bi7O9I3-3 is explained by the enhanced sunlight harvesting ability, accelerated electron transfer, and the formation of reactive species after the incorporation of CQDs. This work offers a promising strategy for constructing high-performance and environmentally friendly photocatalysts for water pollution treatment through the decoration of biomass-derived CQDs.
| Type: | Article |
|---|---|
| Title: | Lignin-derived carbon quantum dots-decorated Bi7O9I3 nanosheets with enhanced photocatalytic performance: Synergism of electron transfer acceleration and molecular oxygen activation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.apsusc.2022.155273 |
| Publisher version: | https://doi.org/10.1016/j.apsusc.2022.155273 |
| 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: | CQDs/Bi7O9I3 composite, Photocatalytic degradation, Tetracycline hydrochloride, Photocatalytic 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/10157647 |
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