Preparation of porous superhydrophobic SiO2/PDMS sponge by template method and application of oil water separation
Superhydrophobic SiO2 aerogel was prepared by sol-gel method using water glass as silicon source.The superhy-drophobic SiO2 aerogel gel was uniformly mixed with polydimethylsiloxane(PDMS),sucrose and glucose were introduced as templates to prepare superhydrophobic SiO2/PDMS sponge.The microstructure and composition were characterized by scan-ning electron microscopy(SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),etc.Its wetting performance was characterized by contact angle measuring instrument.With oil-water mixture as model pollutant,the ef-fects of SiO2 aerogel content and sugar proportion on adsorption properties of sponge were studied.The results showed that the SiO2/PDMS sponge had superhydrophobic and lipophilic properties,with a water contact angle(WCA)of 152.1°.It re-vealed good removal effect in simulated oil-water adsorption experiments,with removal rate of 98%and 95%for vegetable oil and pump oil,respectively.After oil-water separation experiments repeated for 20 times,adsorption capacity and contact angle of SiO2/PDMS sponge did not change significantly,and still showed good hydrophobic performance.
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