1 research outputs found
Surface-Modified Wrinkled Mesoporous Nanosilica as an Effective Adsorbent for Benzene, Toluene, Ethylbenzene, and Xylene in Indoor Air
Surfactant-extracted spherical porous silica nanoparticles
with
wrinkled structures were synthesized, and their adsorption performance
was altered by grafting three organosilanes: n-octyltriethoxysilane,
hexadecyltrimethoxysilane, and triethoxyphenylsilane onto their surface.
The surface-modified silica nanoparticles were used to capture frequently
detected hazardous indoor air chemicals. The physical and chemical
properties of the samples were characterized using thermogravimetric
analysis, Fourier transform infrared spectroscopy, N2 adsorption–desorption
experiments, field-emission scanning electron microscopy, and high-resolution
transmission electron microscopy. Although the organosilane surface
modification did not significantly change the surface areas and pore
structures of porous silica nanoparticles, the capacities of the surface-modified
porous silica nanoparticles for capturing benzene, toluene, ethylbenzene,
and xylene (BTEX) molecules from air were considerably higher than
those of pristine porous silica nanoparticles. The dispersion forces
between adsorbates and adsorbents were the primary factor that affected
the absorption capacity of the surface-modified porous silica nanoparticles.
Consequently, the BTEX capturing potential of surface-modified mesoporous
silica featuring a long alkyl chain was high because of the relatively
high dispersion force between adsorbates and the adsorbent