Synthesis of Yolk–Shell Structured Fe3O4@void@CdS Nanoparticles: A General and Effective Structure Design for Photo-Fenton Reaction

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• 作者：Wen Shi ; Dan Du ; Bin Shen ; Chuanfeng Cui ; Liujia Lu ; Lingzhi Wang ; Jinlong Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 17, 2016
• 年：2016
• 卷：8
• 期：32
• 页码：20831-20838
• 全文大小：525K
• 年卷期：0
• ISSN：1944-8252

文摘

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.15 nm. 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.