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

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%。

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

Polyhydroxybutyrate (PHB) supported calcium alginate (CaAlg) hydrogel nano-filtration composite membranes (CaAlg-PHB) were fabricated without porogen.The morphology and structure of the CaAlg-PHB membranes were investigated by scanning electron microscope (SEM).The swelling,tensile mechanical and hydrophilic 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 CaAlg-P-HB membrane.The rejection properties of dyes were also studied.Results show that the tensile mechanical properties of CaAdg-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-PHB membrane.The contact angle of dichloromethane on the membrane surface reaches 148.3° under water,indicating that the CaAlg-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.