Graphene quantum dots/carbon nitride heterojunction with enhanced visible-light driven photocatalysis of nitric oxide: An experimental and DFT study

Emerging carbon-based quantum dots for sustainable photocatalysis

“…89 In the GQD/g-C 3 N 4 photocatalytic reaction mechanism, Bader charge calculations confirm that under light irradiation, photogenerated electrons excited by GQDs are transferred to g-C 3 N 4 in a direction opposite to the internal electric field. 114 In the photocatalytic hydrogen production process of ZIS-MQDs, a Schottky junction is formed at the ZIS–MQD interface and photogenerated electrons are transferred from the CB of ZIS to the surface of MQDs. The E f of MQDs is close to that of Pt and is more positive than the CB of ZIS, and the Schottky barrier effectively prevents electron reflux, which confirms that ZIS-MQDs are suitable for photocatalytic HER.…”

“…In order to confirm the excellent performance and photocatalytic potential of carbon-based QDs, theoretical analysis is essential. 57,114,115 Triazine (tg-CN) clusters are doped with p-block (B, O, S and P) elements and the CNQDs obtained by different doping methods are further compared using DFT. The calculations predict that B doping of both types of CNQDs favors the substitution of carbon atoms, while O, S and P doping favors the substitution of nitrogen atoms.…”

Antioxidant Carboxymethyl Chitosan Carbon Dots with Calcium Doping Achieve Ultra-Low Calcium Concentration for Iron-Induced Osteoporosis Treatment by Effectively Enhancing Calcium Bioavailability in Zebrafish

“…N 1s band had one peak located at 399.57 eV, which belonged to Pyridine N ( Figure 3 C) [ 30 ]. The O 1s band had two peaks at 531.08 and 531.91 eV, corresponding to C=O and O-C/O-H, respectively ( Figure 3 D) [ 31 , 32 ]. The total XPS spectra of AOCDs:Ca showed 284.57, 398.65, 532.85, and 346.78 Ca2p eV peaks, respectively, indicating that AOCDs:Ca was composed of C, O, N, and Ca elements, with atomic ratios of 49.09%, 33.23%, 17.07%, and 0.61%, respectively ( Figure 3 E).…”

GQD purification study obtained by bottom-up route aiming at the production of photocatalysts

“…However, such photocatalysts have characteristics such as a high band gap energy, thus limiting their use in photocatalytic reactions only with UV light, and there is still high electronic recombination, thus reducing their catalytic activity (REHMAN et al, 2009). Thus, to reduce electronic recombination and improve the absorption of visible light in metallic semiconductors (SC), researchers have demonstrated a significant improvement in obtaining heterostructures of these with GQD purification study obtained by bottom-up route aiming at the production of photocatalysts graphene quantum dots, demonstrating a promising future for nanomaterial in photocatalysis (CUI et al, 2022;LIU et al, 2021;WANG et al, 2021a).…”