Spectroscopic Analyses of Changes in Photocatalytic and Catalytic Activities of Mn- and Ni-Ion Doped and Base-Treated Reduced Graphene Oxide
- Authors
- Lee, Hangil; Kim, Hyun Sung
- Issue Date
- Aug-2021
- Publisher
- MDPI
- Keywords
- reduced graphene oxide; photocatalyst; doping; base treatment
- Citation
- CATALYSTS, v.11, no.8, pp 1 - 10
- Pages
- 10
- Journal Title
- CATALYSTS
- Volume
- 11
- Number
- 8
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/146491
- DOI
- 10.3390/catal11080990
- ISSN
- 2073-4344
2073-4344
- Abstract
- While reduced graphene oxide (rGO) is used widely as a catalyst, its catalytic activity can be improved significantly by modifying it with a metal. In this study, we compared the photocatalytic and catalytic properties of base-treated rGO particles and transition-metal-ion-doped rGO based on the oxidation reaction of thiophenol and the photocatalytic degradation of 4-chlorophenol. Since the two catalytic activities are related to the changes in the electronic structure of rGO, X-ray photoemission spectroscopy, X-ray absorption spectroscopy, and Raman spectroscopy were performed. When rGO was doped with Mn2+ ions, its catalytic properties improved with respect to both reactions. The changes in the electronic structure of rGO are attributed to the formation of defect structures on the rGO surface via a reaction between the doped Mn2+ ions and oxygen of the rGO surface. Thus, the results show that the doping of rGO with Mn ions in the +2-charge state (stable oxide form: MnO) enhances its catalytic and photocatalytic activities. Hence, this study provides new insights into the use of defect-controlled rGO as a novel catalyst.
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