Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 189, Issue -, Pages 181-191Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2016.02.066
Keywords
Photocatalysis; ZnO; ZIF-8; Porous morphology; Carbon doping
Funding
- National Natural Science Foundation of China [21506156]
- Tianjin Municipal Natural Science Foundation [15JCZDJC37300]
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ZnO is an important semiconductor that has been widely applied in solar cell, photocatalysis, environmental remediation. Doping and morphology control are important approaches to improve its photocatalytic performance. Herein, a facile two-step calcination method was developed to fabricate carbon(C)-doped cubic ZnO with porous structure from zeolite imidazolate frameworks (ZIF-8). Compared with one-step pyrolysis, the approach of two-step calcination not only retains the cubic morphology with interconnected ZnO nanoparticles and porous structure but also introduces C doping in ZnO lattice effectively. This morphology has advantage in charge transfer, optical absorption and mass transfer during the photoreaction, and C doping results in high charge-separation efficiency. The sample C350-400 (C-doped ZnO, firstly calcined at 350 degrees C for 2 h from ZIF-8, then 400 degrees C for 1 h) shows the maximum photoactivity, which is ca. 3-fold and 4-fold higher than ZnO (C450) in photodegradation and PEC water splitting (under UV-vis irradiation), respectively. It is expected that the preparation of metal oxide from MOF is a very promising way to fabricate highly efficient photocatalyst. (C) 2016 Elsevier B.V. All rights reserved.
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