采用连续静电纺丝法制备“层层递进式”Janus-PAN(聚丙烯腈)纳米纤维膜。Janus-PAN纳米纤维膜以亲水性PAN纳米纤维膜为底层、聚丙烯腈/聚氨酯(PAN/PU)共混纳米纤维膜为中间层,喷涂疏水改性的SiO2粒子作为顶层。通过场发射扫描电子显微镜、傅里叶变换红外光谱仪、接触角测量仪、电子单纤维强力仪对Janus-PAN纳米纤维膜的表面形貌、化学组成、表面润湿性能、力学性能进行分析和测试并研究了其油水分离性能和循环使用性能。结果表明Janus-PAN纳米纤维膜具有不对称的润湿性,能够有效切换分离水包油和油包水乳液,经过8次循环分离后仍具有较高的分离效率。其中,水包石油醚和水包机油乳液的分离效率超过99.2%和99.0%,花生油包水和石蜡油包水乳液的分离效率可达97.3%和98.6%以上。
The “layer by layer” Janus-PAN nanofiber membrane was prepared by continuous electrospinning.The Janus-PAN nanofiber membrane was composed of hydrophilic polyacrylonitrile (PAN) nanofiber membrane as the bottom layer,polyacrylonitrile/polyurethane (PAN/PU) blended nanofiber membrane as the middle layer,and hydrophobically modified SiO2 nanoparticles as the top layer.The surface morphology,chemical composition,surface wettability and mechanical properties of Janus-PAN nanofiber membranes were analyzed and tested by field emission scanning electron microscope,Fourier transform infrared spectrometer,contact angle measuring instrument and electronic single fiber strength instrument.The oil-water separation and recycling properties of the Janus-PAN nanofiber membrane were investigated.The results showed that Janus-PAN nanofiber membrane had asymmetric wettability and could effectively switch between water-in-oil emulsion and oil-in-water emulsion,and still had high separation efficiency after 8 cycles of separation experiments.In addition,the separation efficiency of petroleum ether in water and engine oil in water emulsion could exceed 99.2% and 99.0%,respectively.The separation efficiency of water in peanut oil and water in paraffin oil emulsion could reach over 97.3% and 98.6%.
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基金资助
新疆维吾尔自治区自然科学基金面上项目(2022D01C31);新疆大学2022年度大学生创新训练计划项目(202210755076)
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