Wong, Kien Tiek Jang, Seok Byum Saravanan, Pichiah Nah, In Wook Park, Sehkyu Choi, Jaeyoung Park, Chulhwan Kim, Younghun Yoon, Yeomin Jang, Min 2024-01-19T20:31:33Z 2024-01-19T20:31:33Z 2021-09-02 2019-03-31 0169-4332 https://pubs.kist.re.kr/handle/201004/120186 In this study, exfoliated g-C3N4 (GCN) coupled carbon quantum dots (CNQDs) were prepared via one-pot hydrothermal (HT) treatment at various temperatures (100-200 degrees C) and in various amounts of time (0-20 h). Comprehensive characterization was conducted to study not only the chemical states, photo-optical properties, particle sizes, and crystal structures, but also the effect of these changes on the degradation of BPA. Photocatalytic degradation was conducted under near-visible LED as a low energy light source (0.128 W cm(-3)). The CNQD that were prepared at 180 degrees C for 12 h showed the highest degradation rate (3.6 x 10(-2) min(-1)), which was 3.0 times higher than GCN. These improved photocatalytic activities corresponded to increases in the photo-reactive surface via exfoliation of GCN sheets, introduction of heteroatom oxygen onto GCN sheets, the addition of CQDs, and shortened bandgap. These characteristics allow for the effective transfer and separation of electrons. Nonetheless, the structural breakdown of the CNQD was observed when the HT time was longer than 12 h (180 degrees C). The defected sheets showed a detrimental effect towards photocatalytic degradation by trapping electrons, leading to shorter electron life times. English ELSEVIER SCIENCE BV PHOTOCATALYTIC NO OXIDATION METAL-FREE SURFACE MODIFICATION ULTRATHIN G-C3N4 H-2 EVOLUTION DOPED G-C3N4 SINGLE-ATOM NITRIDE GRAPHENE NANOSHEETS Critical insight on the hydrothermal effects toward exfoliation of g-C3N4 and simultaneous in-situ deposition of carbon quantum dots Article 10.1016/j.apsusc.2018.12.064 1 APPLIED SURFACE SCIENCE, v.471, pp.703 - 713 APPLIED SURFACE SCIENCE 471 703 713 scie scopus 000455471100080 2-s2.0-85058037117 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article PHOTOCATALYTIC NO OXIDATION METAL-FREE SURFACE MODIFICATION ULTRATHIN G-C3N4 H-2 EVOLUTION DOPED G-C3N4 SINGLE-ATOM NITRIDE GRAPHENE NANOSHEETS g-C3N4 Hydrothermal Carbon quantum dots Bisphenol A Exfoliation