糖基掺杂聚酰胺纳滤膜制备及其性能研究

Fabrication and properties of carbohydrate doped thin film composite nanofiltration membranes

以哌嗪和糖基物质(葡萄糖、蔗糖和棉子糖)的混合溶液为水相,均苯三甲酰氯的正己烷溶液为油相,采用界面聚合法制备了糖基掺杂的聚酰胺复合纳滤膜.其中,选择了蔗糖掺杂的纳滤膜,讨论了蔗糖和哌嗪的不同比例对纳滤膜的渗透性和分离性能的影响,并对其膜的微观结构、表面润湿性、表面电荷特征进行了详细的测试与表征.蔗糖的掺杂改变了膜的表观结构,降低了膜的粗糙度和聚酰胺皮层厚度,提高了膜的表面亲水性;随着蔗糖比例的增加,纳滤膜的渗透性能也随之增加;当蔗糖质量分数达到0.8%时,膜对Na 2SO 4的截留率仍保持在99.1%,而纯水通量则达到97.0 L/(m^2·h·MPa),较原始TFC膜上涨了86%.

Herein,three carbohydrate doped thin film composite nanofiltration membranes were successfully fabricated via interfacial polymerization method used a mixed solution of PIP/glucose or PIP/sucrose or PIP/raffinose as the aqueous phase and trimesoyl chloride as the organic phase.Among them,the sucrose-doped nanofiltration membrane(PS)performed the best properties.Moreover,the effects of different ratios of sucrose and PIP on the membrane permeability and separation performance were observed.The micro-structure,surface wettability and surface charge characteristics of the PS membrane were characterized.The results showed the apparent structure of PS was changed,and the roughness and the thickness of the PA layer were both reduced,while the surface hydrophilicity was improved by adding sucrose in the membrane.In addition,the outstanding permeability of PS was observed with the increasing ratio of sucrose.And when the sucrose concentration reached 0.8%,the rejection of Na 2SO 4 remained at 99.1%,while the pure water flux reached 9.7 L/(m^2·h·bar),which was 86%higher than the original TFC membrane.