Yolk-shell structured Fe@void@mesoporous silica with high magnetization for activating peroxymonosulfate

Sulfate radical anion(SO4*)based Fenton-like reaction have recently received a large quantity of attention owing to their strong oxidative capacity and high selectivity toward organic pollutants.However,the development of a high-efficient catalyst for activation of peroxymonosulfate(PMS)with a fast separation is still challengeable.Herein,magnetic mesoporous silica composites with a yolk-shell structure(Fe@void@mSiO2)have been prepared via a successive coating strategy,followed by a hightemperature in-situ treatment and demonstrated as a high-efficient and fast magnetic separable catalyst for the activation of PMS.The resultant material possesses a well-defined yolk-shell structure with high specific surface area(~495.0 m^2/g),uniform pore size(~6.9 nm)and super large magnetic susceptibility(~105 emu/g).Owing to the unique properties,the material possesses an excellent degradation activity for tetracyclines(TC),which is much higher than the commercialized Zero Valent Iron(ZVI)nanoparticles.Additionally,the catalyst is able to work over a broad pH range and be quickly recycled by using an external magnetic field.This research provides a promising strategy for the synthesis and design of multifunctional catalyst for the Fenton-like process.