Preparation of hydrophobic hollow silica nanospheres with porous shells and their application in pollutant removal

Abstract

A series of hydrophobic hollow silica nanospheres with high specific surface areas and porous shells were successfully prepared through combination of a one-step reverse-phase microemulsion route and a simple post selective etching method. These materials owned porous shells and high specific surface areas, which were generated in the etching process. The distribution difference of organic groups among the solid nanosphere was innovatively utilized to create a different etching rate between the surface and the inner part of the solid silica nanosphere. After etching, the organic groups are still present on the surface which together with the rough surface give it hydrophobic properties and the contact angles can reach 150u. The reported materials showed good performance in the removal of 4-NP in water.

Synthesis of Pd/SBA-15 catalyst employing surface-bonded vinyl as a reductant and its application in the hydrogenation of nitroarenes

“…The solid-state 29 Si CP/MAS NMR spectrum of vinylfunctionalized SBA-15 is shown in Fig. 2a 38 Moreover, a chemical shi at À80.9 ppm (RSi(OSi) 3 [T 3 ]) was also observed in the spectra. 39 These results proved the presence of an organosilane group (Si-CH]CH 2 ) in the material, which was further conrmed by the solid-state 13 C CP-MAS NMR spectra of vinyl-functionalized SBA-15.…”

Tuning the Hydrophobicity of Layer-Structure Silicates To Promote Adsorption of Nonaqueous Fluids: Effects of F– for OH– Substitution on CO2 Partitioning into Smectite Interlayers

“…Oxide materials have a wide range of hydrophobicities that depend on the complex interactions among their structure, permanent and pH-dependent charge, and functionalization of their surface sites. [1][2][3] Among the layer structure silicates (phyllosilicates), phases with no permanent structural charge such as talc and pyrophyllite are more hydrophobic than those with a permanent charge, such as micas and smectite clays. [4][5][6] In addition, heterogenous charge distribution created by isomorphic cation substitution can result in local variations in hydrophobicity, which can affect the adsorption of water molecules, ions and organic species.…”

Silica-based nanocomposites via reverse microemulsions: classifications, preparations, and applications

“…What we need to do is ensure there is a difference between the inside and the outside of the structures. Very recently, Shi and coworkers 172 cyclohexane/n-butanol. Due to the lower hydrolysis speed and oleophilic property of the organosilane, the organic groups gathered near the surface.…”