Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 32, Pages 20831-20838Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b07644
Keywords
Fe3O4@void@CdS; yolk-shell; photo-Fenton; wide pH range; semiconductors
Funding
- National Nature Science Foundation of China [U140710223, 21237003, 21377038]
- National Basic Research Program of China (973 Program) [2013CB632403]
- Science and Technology Commission of Shanghai Municipality [14230710500, 16JC1401400]
- PetroChina Innovation Foundation [2015D-5006-0402]
- Science and Technology Commission of Jiangsu Province [BC2015135]
- Fundamental Research Funds for the Central Universities
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Yolk-shell (Y-S) structured Fe3O4@void@CdS nanoparticles (NPs) are synthesized through a one-pot coating-etching process with Fe3O4@ SiO2 as the core, where the coating of an outer CdS shell from a chemical bath deposition (CBD) process is simultaneously accompanied by the gradual etching of an inner SiO2 shell. The as-prepared Fe3O4@void@CdS NPs (ca. 200 nm) possess good monodispersity and a uniform cdS shell of ca E15 This composite exhibits excellent photo-Fenton (ph-F) activity toward the degradation of methylene blue (MB) in a wide pH working range of 4.5-11 under the visible light irradiation. A series of control experiments demonstrate the unique Y S structure contributes to the enhanced activity, where the separation of hole electron pair from cdS and the reduction of Fe2+ from Fe3+ are mutually promoted. The similar efficiency can also be achieved when the shell component changes to TiO2, or CeO2, demonstrating a general strategy for the design of robust ph-F agent.
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