期刊
ADVANCED MATERIALS INTERFACES
卷 10, 期 4, 页码 -出版社
WILEY
DOI: 10.1002/admi.202201961
关键词
adsorption; core-shell nanostructure; crystallization; magnetic properties; zeolite
This article presents a strategy for synthesizing core-shell nanostructures with magnetic core and zeolitic shell. By solid-state reorganization and using tetrapropylammonium hydroxide as an organic structure-directing agent under mild hydrothermal conditions, gamma-Fe2O3@mesoporous silica/silicalite-1 core-shell nanoparticles are prepared. The detailed characterization confirms the excellent adsorption capacity and easy separation of the nanostructures.
Synthesis of core-shell nanostructures with magnetic core and zeolitic shell is an ongoing challenge. Herein, a strategy is presented for preparation of gamma-Fe2O3@mesoporous silica (mSiO(2)) core-shell nanoparticles containing ultrasmall domains of silicalite-1 in the shell (gamma-Fe2O3@mSiO(2)/silicalite-1). The strategy consists in a solid-state reorganization of the precursor amorphous mSiO(2) shell into silicalite-1 using a tetrapropylammonium hydroxide (TPAOH) as an organic structure-directing agent (OSDA) under mild hydrothermal (HT) conditions. The formation of silicalite-1 crystalline domains is investigated through the detailed characterization of products obtained at different times of HT treatment by X-ray diffraction (XRD), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and nitrogen physisorption. By careful tuning the time of HT treatment, the gamma-Fe2O3@mSiO(2)/silicalite-1 nanostructures are prepared. Benefitting from the unique mesopores/microporous structure formed, the gamma-Fe2O3@mSiO(2)/silicalite-1 core-shell nanostructure shows superior adsorption capacity to remove aniline from aqueous solutions than the gamma-Fe2O3@mSiO(2). Moreover, the gamma-Fe2O3@mSiO(2)/silicalite-1 nanostructure is easily separated from aqueous solutions using magnetic separation technique within 1 min.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据