Preparation Of Superhydrophobic And Superoleophilic Surfaces With Sparation Of Oil-water Property

Superhydrophobic and superoleophilic materials show effective ability toseparate of oil-water solution, which are greatly appreciated for applications suchas treatment of industrial oily wastewater and polluted oceanic water. However,there are few reports on the fabrication of superhydrophobic and superoleophilictextiles for separation of oil-water solutions. This thesis reviewed the research onsuperhydrophobic and Superoleophilic surfaces and the work on fabrication ofsurfaces for separation of oil-water, and presents the main research contents andresults about fabrication of superhydrophobic and superoleophilic poly(ethyleneterephthalate)(PET) textiles for separation of oil-water solutions, which arelisted as follows:(1) Hydrophobic SiO2sol was prepared using tetraethoxysilane (TEOS) asthe precursor, ammonia as catalyst, and1,1,1,3,3,3-hexamethyl disilazane(HMDS) as modifier. Then the SiO2sol was loaded on fibers to obtainsuperhydrophobic and superoleophilic textiles. Transmission electronmicroscope was used to characterize the SiO2sols. Scanning electron microscope(SEM) was employed to investigate the topography of the textiles. The influenceof HMDS concentration on the hydrophobic performance and the oil separationefficiency were investigated. The textiles indicated superhydrophobic andsuperoleophilic property simultaneously. Utilizing these properties, a setup wasdesigned using the textile as a screen mesh to filter oil through down to acollector and leave water drops rolling over, realizing continuous oil–watermixture separation.(2) PET fibers were etched with alkali and treated using HMDS bychemical vapor deposition (CVD) to fabricate superhydrophobic andsuperoleophilic textiles. Scanning electron microscope (SEM) was employed toinvestigate the topography of the textiles. SEM-EDS was employed to test theelement distribution in the interior of the fibers. The influence of HMDS concentration on the properties of the textiels was investigated. Separationefficiency of oil-water solution of the textiles was evaluated.(3) Alkali etched PET fibers were treated with HMDS and hexadecyltrimethoxysilane as modifiers by CVD to fabricate superhydrophobic andsuperoleophilic textiles. Scanning electron microscope (SEM) was employed toinvestigate the topography of the textiles. SEM-EDS was employed to test theelement distribution in the interior of the fibers. The influence of modifiers’concentration and ratio on the properties of the textiels was investigated.Separation efficiency of oil-water solution of the textiles was evaluated. Resultsshowed that combination of silanes with short and long carbon chains is aneffective way to modify PET textiles for fabrication of superhydrophobic andsuperoleophilic textiles for oil-water separation.