Critical insight on the hydrothermal effects toward exfoliation of g-C3N4 and simultaneous in-situ deposition of carbon quantum dots

Title
Critical insight on the hydrothermal effects toward exfoliation of g-C3N4 and simultaneous in-situ deposition of carbon quantum dots
Authors
나인욱최재영Sehkyu ParkKien Tiek WongSeok Byum JangPichiah SaravananChulhwan ParkYounghun KimYeomin YoonMin Jang
Issue Date
2019-03
Publisher
Applied surface science
Citation
VOL 471-713
Abstract
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  °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  °C for 12  h showed the highest degradation rate (3.6  ×  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  °C). The defected sheets showed a detrimental effect towards photocatalytic degradation by trapping electrons, leading to shorter electron life times.
URI
http://pubs.kist.re.kr/handle/201004/69048
ISSN
0169-4332
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE