聚羟基丁酸酯纳米纤维支撑海藻酸钙纳滤膜制备及抗污染性能

Preparation and Anti-Fouling Properties of Polyhydroxybutyrate Nanofiber Supported Calcium Alginate Nanofiltration Membrane

以聚羟基丁酸酯(PHB)纳米纤维膜为载体,不添加致孔剂,制备了PHB纳米纤维支撑的海藻酸钙(CaAlg)水凝胶纳滤膜(CaAlg-PHB复合膜)。通过扫描电子显微镜观察膜的形貌,研究膜的溶胀性能、拉伸力学性能、亲水性和对乳化油、牛血清蛋白(BSA)溶液的抗污染性能以及对染料的截留性能。结果表明,CaAlg-PHB复合膜的断裂强度与CaAlg自支撑膜相比得到较大提高。乳化油悬浊液和BSA溶液的稳定通量分别为纯水通量的83.82%和86.70%,表明CaAlgPHB复合膜具有良好的抗污染性能。3D超景深显微镜观测显示乳化油在膜表面不粘附,水下二氯甲烷在膜表面的接触角达到148.3°,表明该复合膜在水下超疏油。在0.1 MPa压力下,CaAlg-PHB复合膜对染料刚果红的稳定通量和截留率分别为30.57 L/(m^2·h)和96.95%。

membranes （ Polyhydroxybutyrate （PHB） supported calcium alginate （ CaAlg） CaAlg-PHB） were fabricated without porogen. The morphology hydrogel nano-filtration composite and structure of the CaAlg-PHB membranes were investigated by scanning electron microscope （SEM）. The swelling, tensile mechanical and hydrophilie properties of the membranes were researched. Emulsified oil-water and bovine serum albumin （BSA） solutions were used to investigate the anti-fouling properties of the CaAIg-PHB membrane. The rejection properties of dyes were also studied. Results show that the tensile mechanical properties of CaAIg-PHB nanofibrous membrane are greatly improved compared with free-standing CaAlg hydrogel filtration membrane and CaAlg-PHB membranes maintain the superior hydrophilic characteristics. The stable flux of emulsified oil-water and BSA is 83.82 % and 86.70% respectively of the pure water flux, indicating that the CaAlg-PHB nanofibrous membrane exhibits good antifouling properties. The results of 3D ultra-depth three-dimensional microscope show that the emulsified oil could not adhere on the surface of CaAlg-PFIB membrane. The contact angle of dichloromethane on the membrane surface reaches 148.3° under water, indicating that the CaAIg-PHB composite membrane exhibits super hydrophobic performance The flux and the rejection of Congo red reaches 30.57 L/（ m2· h） and 96.95% at 0.1 MPa, respectively.