Janus SiO_(2)纤维膜的制备及其油水分离性能研究

Preparation of Janus SiO_(2)fiber membranes and their oil-water separation performance

研究Janus SiO_(2)纤维膜的制备及其油水分离的性能。采用顺序静电纺丝策略,以正硅酸乙酯和甲基三甲氧基硅烷为原料,制备了具有不对称润湿性的Janus SiO_(2)纤维膜。结果表明:Janus SiO_(2)纤维膜的亲水层和疏水层之间结合紧密,没有分层的现象,亲水层的水接触角约为0°,疏水层的水接触角约为118°。Janus SiO_(2)纤维膜在不同类型油水混合物分离中均表现优异,油通量高于1425L/(m·h),水通量高于1326L/(m·h),并且除油和除水的分离效率均高于97.8%。此外,经过10次油水分离循环后,制备的Janus SiO_(2)纤维膜依然保持较高的分离通量,油通量损失为4.07%,水通量损失仅为3.53%,表现出良好的循环稳定。总体而言,Janus SiO_(2)纤维膜以其简单的制造方法、高通量和优异的稳定性,在含油废水的处理方面有着广泛应用的前景。

The preparation of Janus SiO_(2)fiber membranes and their performance for oil-water separation were investigated.Janus SiO_(2)fiber membranes with asymmetric wettability were prepared by sequential electrostatic spinning strategy with ethyl orthosilicate and methyltrimethoxysilane as raw materials.The results showed that the hydrophilic and hydrophobic layers of the Janus SiO_(2)membranes were tightly bonded without delamination.The water contact angle of the hydrophilic layer was about 0°,while that of the hydrophobic layer was 118°.The Janus SiO_(2)membranes exhibited excellent performance in the separation of various types of oil-water mixtures,with an oil fluxes higher than 1425L/(m·h)and a water fluxes above 1326L/(m·h).The separation efficiencies for both oil and water removal were higher than 97.8%.In addition,after 10 oil-water separation cycles,the prepared Janus SiO_(2)fiber membranes still maintained high separation fluxes,with an oil flux loss of 4.07%and a water flux loss of only 3.53%,demonstrating good cycle stability.Overall,the Janus SiO_(2)fiber membranes have a promising future for a wide range of applications in the treatment of oily wastewater due to their simple fabrication method,high flux and excellent stability.