Surface silylation of natural mesoporous/macroporous diatomite for adsorption of benzene

Journal of Colloid and Interface Science
Wenbin YuFanrong Chen

Abstract

Naturally occurring porous diatomite (Dt) was functionalized with phenyltriethoxysilane (PTES), and the PTES-modified diatomite (PTES-Dt) was characterized using diffuse reflectance Fourier transform infrared spectroscopy, nitrogen adsorption, nuclear magnetic resonance spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. After silylation, a functional group (-C6H5, phenyl) was successfully introduced onto the surface of Dt. PTES-Dt exhibited hydrophobic properties with a water contact angle (WCA) as high as 120°±1°, whereas Dt was superhydrophilic with a WCA of 0°. The benzene adsorption data on both Dt and PTES-Dt fit well with the Langmuir isotherm equation. The Langmuir adsorption capacity of benzene on PTES-Dt is 28.1 mg/g, more than 4-fold greater than that on Dt. Moreover, the adsorption kinetics results show that equilibrium was achieved faster for PTES-Dt than for Dt, over the relative pressure range of 0.118-0.157. The excellent benzene adsorption performance of PTES-Dt is attributed to strong π-system interactions between the phenyl groups and the benzene molecules as well as to the macroporosity of the PTES-Dt. These results show that the silylated diatomite could be a new and inexpensive ...Continue Reading

References

Aug 1, 1991·Journal of the Air & Waste Management Association·G Leson, A M Winer
Aug 30, 2008·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Ying-Sing LiSorrie Ceesay
Feb 6, 2010·Journal of Hazardous Materials·Maria AivaliotiEvangelos Gidarakos

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