posted on 2024-09-18, 17:13authored byJiaxin Du, Su Liu, Qiangyu Xue, Qiao Xu, Jinhan Li, Wenting Shen, Yinsong Si
Porous microspheres with desired pore size and distribution
are
in high demand for loading various guest materials, especially various
pollutants that are several nanometers in size or stably suspended
in liquid. Herein, multilevel porous SiO2 microspheres
with arbitrarily adjustable core–shell ratios are prepared
by solely regulating the time interval between the start of the hydrolysis
reaction and the addition of organic solvent. The core–shell
ratio of the SiO2 microspheres increases gradually with
prolongation of the addition time interval; meanwhile, the specific
surface area can be adjusted from 543.2 m2 g–1 to 992.9 m2 g–1, and the average pore
diameter varies from 2.3 to 5.7 nm together with a high pore volume
reaching 0.91 cm3 g–1. Moreover, the
hierarchical core–shell SiO2 microspheres with an
adjustable core–shell ratio, a large specific surface area,
and a multilevel pore size could be obtained on a large scale. These
SiO2 microspheres demonstrate excellent performance in
coloading platinum nanoparticles and various dye molecules, suggesting
their great potential in treating various pollutants in printing and
dyeing wastewater.