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

Abstract

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 Fe(2+) from Fe(3+) 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.

An Iron Oxychloride/Reduced Graphene Oxide Heterojunction with Enhanced Catalytic Performance as a Photo‐Fenton Catalyst

“…Unfortunately, the sluggish kinetics for the Fe III to Fe II reduction greatly limit its application, and the improvement of the reaction kinetics is the main challenge for the heterogeneous Fenton reaction. To improve the reduction reaction, Fe III ‐based composites have been explored; however, these composites must be used under harsh conditions (e.g., with acidic solutions, ultraviolet light, visible light, high temperature, or electrical energy) …”

In situ synthesis and immobilization of a Cu(ii)–pyridyl complex on silica microspheres as a novel Fenton-like catalyst for RhB degradation at near-neutral pH

“…4 Among various AOPs, Fenton's oxidation has received great attention because of its high efficiency, ease of operation and relatively low operating costs. [5][6][7] The traditional Fenton oxidation process is based on soluble ferrous ion and hydrogen peroxide to generate highly oxidative species, i.e., hydroxyl radicals, according to the Haber-Weiss mechanism following the reaction: [6][7][8] Fe 2+ + H 2 O 2 / Fe 3+ + cOH + OH À (1)…”

Ultra-sustainable Fe78Si9B13 metallic glass as a catalyst for activation of persulfate on methylene blue degradation under UV-Vis light

“…The improved performance of the Fe 78 Si 9 B 13 reusability is owing to the following reasons. (1) The pH value plays a significant role in the Fenton/Fenton-like reaction5960, as hydroxyl radicals (∙OH) can be rapidly activated under pH 2 by using Fe 78 Si 9 B 13 and H 2 O 2 13 whereas the pH of MB dye solution after adding Fe 78 Si 9 B 13 and persulfate in this work is only 3.39. The acidic conditions can enhance the corrosive speed of the SiO 2 layer on the Fe 78 Si 9 B 13 surface leading to fast surface decay behaviour.…”