期刊
CATALYSIS TODAY
卷 357, 期 -, 页码 350-360出版社
ELSEVIER
DOI: 10.1016/j.cattod.2019.05.049
关键词
Graphene oxide; Zinc oxide; ZnO-GO hybrid; Photocatalysis; Surface chemistry
资金
- Spanish MINEICO [ENE 2016-79282-C5-1-R, BES2014-068727, EEBB-I-18-12785]
- Gobierno de Aragon (Grupo Reconocido) [DGA T03_17R]
- EU
- Associate Laboratory LSRE-LCM - European Regional Development Fund (ERDF) through COMPETE2020-Programa Operacional Competitividade e Internacionalizacao (POCI) [POCI-01-0145-FEDER-006984]
- national funds through FCT-Fundacao para a Ciencia e a Tecnologia
- Spanish MINEICO (EU)
- Spanish Ministry of Science, Innovation and Universities for his 'Juan de la Cierva - Incorporacion' grant [IJCI-2016-27789]
Graphene oxide (GO) and related materials are widely reported to enhance the photocatalytic activity of zinc oxide. However, the origin of the observed performance improvements remains elusive and studies contributing to a deeper understanding of this critical issue are largely missing. In this work, we have prepared a set of benchmark ZnO-GO hybrid materials in order to systematically put under closer scrutiny the influence of the surface chemistry of GO on the photocatalytic degradation of methylene blue. The set of ZnO-GO hybrids has been synthesized in an ultrasonication process involving ZnO nanoparticles obtained in a microwave synthesis process and GO with three distinct oxidation degrees, employed in three different loading fractions. Structural and physical-chemical characterization by XRD, FTIR, Raman, UV-vis, photoluminescence and spectroscopy and XPS, consistently demonstrate the importance of the surface chemistry of GO for establishing photo-induced charge-transfer interface interactions with ZnO, facilitating the enhancement of the catalytic activity of the ZnO-GO catalyst. Optimized interface interactions thus enabled the design of a ZnO-GO catalyst exhibiting a conversion rate of 80% obtained in a time of 70 min and at a catalyst concentration of only 0.045 mg/mL.
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