Abstract: Super-hydrophobic filter papers were prepared by using SiO2 nano-particles midified by silylating reagent. The water contact angle on the filter papers was higher than 150°. Thermogravimetry and scanning electron microscope were used to characterize the filter paper. The results showed that SiO2 nano-particle layer was formed on the micro-fibers of filter paper. The combined nano- and micro-structure produced the super-hydrophobic property of the filter paper. The oil-water separation ability of the paper was also investigated, high oil-water separation efficiencies of the paper, especially for high-viscosity mixtures, were confirmed.

Key words: super-hydrophobic filter paper, Nanoparticles, Silylation modification, Oil-water separation