期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 266, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118665
关键词
FeOCl/CDots; In-situ H2O2; Generation and activation; Photocatalytic Fenton; p-Chlorophenol
资金
- National Natural Science Foundation of China [51722811, 51738013]
- Guangxi Tagui Scholar' Construction Project [2016A10]
Achieving efficient production and activation of H2O2 is a promising strategy to enhance the efficiency of heterogeneous Fenton reactions. For this purpose, an ideal heterogeneous Fenton platform was constructed though chemical embedding of carbon nanodots (CDots) onto the surface of iron oxychloride (FeOCl/CDots). Experimental results and theoretical calculations confirmed that CDots acted as the reactive sites for highly effective separation of photogenerated electrons and holes in the FeOCI substrate, whereby the 02 molecules in solution could be synchronously reduced to H2O2 via a two-electron pathway (02- '02H- H2O2) on the CDots. Under visible light irradiation, the concentration of H2O2 accumulated to- 337.2 trio] L-1 in the FeOCl/CDots system, which was almost-14 times higher than that using FeOCI alone. Moreover, the FeOCI substrate with abundant Fe2+ could directly capture and activate the H2O2 to produce abundant hydroxyl radical ('OH), thereby effectively avoiding the H2O2 mass transfer limitation encountered in traditional heterogeneous Fenton reactions. In experiments with a typical organic contaminant (p-chlorophenol), the oxidation rate and mineralization efficiency in this Fenton system were-4 and 6 times higher than that achieved using Fe0C1 alone.
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