• Complex
  • Title
  • Keyword
  • Abstract
  • Scholars
  • Journal
  • ISSN
  • Conference
成果搜索

author:

Pan, Dengyu (Pan, Dengyu.) [1] | Jiao, Jinkai (Jiao, Jinkai.) [2] | Li, Zhen (Li, Zhen.) [3] | Guo, Yanting (Guo, Yanting.) [4] | Feng, Chuanqi (Feng, Chuanqi.) [5] | Liu, Yuan (Liu, Yuan.) [6] | Wang, Liang (Wang, Liang.) [7] | Wu, Minghong (Wu, Minghong.) [8] (Scholars:吴明红)

Indexed by:

SCIE

Abstract:

Water-Soluble, single-crystalline, and amine-functionalized graphene quantum dots (GQDs) with absorption edge at similar to 490 nm were synthesized by a molecular fusion method, and stably deposited onto anatase TiO2 nanoparticles under hydrothermal conditions. The effective incorporation of the GQDs extends the light absorption of the TiO2 nanoparticles from UV to a wide visible region. Moreover, amine-functionalized GQD-TiO2 heterojunctions can absorb more 02 than pure TiO2, which can generate more center dot O-2 species for MO degradation. Accordingly, the heterojunctions exhibit much higher photocatalytic performance for degrading methyl orange (MO) under visible-light irradiation than TiO2 alone. At optimum GQD content (1.0 wt %), an apparent MO decomposition rate constant is 15 times higher than that of TiO2 alone, and photocurrent intensity in response to visible-light excitation increases by 9 times. Compared with conventional sensitization by toxic, photounstable quantum dots such as CdSe QDs, the sensitization by environmentally friendly GQDs shows higher visible-light photocatalytic activity and higher cycling stability. Monodispersed QD-based heterojunctions can effectively inhibit the fast recombination of electron hole pairs of GQDs with a large exciton binding energy. The photogenerated electron transfer, energy-band-matching mechanism of GQD/TiO2, and possible MO decomposition pathways under visible-light irradiation are proposed.

Keyword:

Graphene quantum dots Heterojunctions Photocatalysis

Community:

  • [ 1 ] [Pan, Dengyu]Shanghai Univ, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China
  • [ 2 ] [Jiao, Jinkai]Shanghai Univ, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China
  • [ 3 ] [Guo, Yanting]Shanghai Univ, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China
  • [ 4 ] [Feng, Chuanqi]Shanghai Univ, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China
  • [ 5 ] [Liu, Yuan]Shanghai Univ, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China
  • [ 6 ] [Wang, Liang]Shanghai Univ, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China
  • [ 7 ] [Li, Zhen]Shanghai Univ, Shanghai Appl Radiat Inst, Shanghai 200444, Peoples R China
  • [ 8 ] [Wu, Minghong]Shanghai Univ, Shanghai Appl Radiat Inst, Shanghai 200444, Peoples R China

Reprint 's Address:

Show more details

Related Keywords:

Source :

ACS SUSTAINABLE CHEMISTRY & ENGINEERING

ISSN: 2168-0485

Year: 2015

Issue: 10

Volume: 3

Page: 2405-2413

5 . 2 6 7

JCR@2015

7 . 1 0 0

JCR@2023

JCR Journal Grade:1

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count: 251

SCOPUS Cited Count: 267

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

Affiliated Colleges:

Online/Total:314/10013062
Address:FZU Library(No.2 Xuyuan Road, Fuzhou, Fujian, PRC Post Code:350116) Contact Us:0591-22865326
Copyright:FZU Library Technical Support:Beijing Aegean Software Co., Ltd. 闽ICP备05005463号-1