%0 Journal Article
%A Liu, Chao
%A Li, Jiansheng
%A Qi, Junwen
%A Wang, Jing
%A Luo, Rui
%A Shen, Jinyou
%A Sun, Xiuyun
%A Han, Weiqing
%A Wang, Lianjun
%D 2014
%T Yolk–Shell Fe0@SiO2 Nanoparticles
as Nanoreactors for Fenton-like Catalytic Reaction
%U https://acs.figshare.com/articles/journal_contribution/Yolk_Shell_Fe_sup_0_sup_SiO_sub_2_sub_Nanoparticles_as_Nanoreactors_for_Fenton_like_Catalytic_Reaction/2265304
%R 10.1021/am503063m.s001
%2 https://acs.figshare.com/ndownloader/files/3901318
%K 2O
%K model catalysis reaction
%K Fe
%K HMSS
%K iron nanoparticles
%K mesoporous silica spheres
%K YSNs nanoreactors
%X Yolk–shell
nanoparticles (YSNs) with active metal cores
have shown promising applications in nanoreactors with excellent catalytic
performance. In this work, Fe0@SiO2 YSNs were
synthesized by a sequential “two-solvents” impregnation–reduction
approach. Specifically, FeSO4 aqueous solution was introduced
into the preformed hollow mesoporous silica spheres (HMSS), dispersed
in n-hexane, via a “two-solvent” impregnation
way. Subsequently, aqueous solution of sodium borohydride (NaBH4) was introduced into the cavity of HMSS by the same way,
leading to the formation of Fe core inside the HMSS through the reaction
between Fe2+ and NaBH4. The resulting Fe0@SiO2 YSNs possess distinctive structures, including
active cores, accessible mesoporous channels, protective shells, and
hollow cavities. To present the catalytic performance of YSNs nanoreactors,
Fenton-like catalytic oxidation of phenol was chosen as the model
catalysis reaction. In addition to the Fe0@SiO2 YSNs, two other materials were also applied to the catalytic system
for comparison, including Fe@SiO2 composites with iron
nanoparticles sticking on the outer shells of HMSS (Fe@SiO2-DI) and bare iron nanoparticles without HMSS (bare Fe0), respectively. The catalytic results show that Fe0@SiO2 YSNs exhibit higher catalytic rate toward phenol removal
at 2-fold and 4-fold as compared to that of Fe@SiO2-DI
and bare Fe0, indicating the outstanding catalytic property
of YSNs nanoreactors. To further clarify the relationship between
catalytic properties and structural characteristics, the adsorption
experiments of the three samples were also performed in the absence
of H2O2. Other than catalytic results, Fe0@SiO2 YSNs show slightly higher adsorption efficiency
than the other two samples, indicating the accessibility of nanoreactors.
This result demonstrates that the removal of phenol in the oxidation
system of Fe0@SiO2 YSNs may have contributed
to the structure-enhanced effect of YSNs as nanoreactors.
%I ACS Publications