UIO-66改性聚酰胺正渗透复合膜的制备及性能研究

采用界面聚合方法将UIO-66纳米颗粒引入复合膜中制备出改性的聚酰胺复合膜，并利用傅里叶红外光谱（FT-IR）、扫描电子显微镜（SEM）、原子力显微镜（AFM）、X射线衍射光谱（XRD）和接触角仪等仪器对材料和复合膜进行测定表征.以去离子水为原料液，1mol/L氯化钠溶液为汲取液进行渗透性能测试.选取BSA及SA作为污染物进行污染实验，并利用自制探针，借助原子力显微镜（AFM）测定了污染物与膜面的微观作用力.研究发现，相较于原始的聚酰胺复合膜，当UIO-66材料的添加量为0.04wt%时，改性复合膜在FO模式下的纯水通量由10.28L/（m²·h）增大到13.67L/（m²·h）， PRO模式下纯水通量由17.68L/（m²·h）增大到20.41L/（m²·h），渗透性能改善效果显著，并具有较好的选择性能.此外，污染实验发现相较于原始膜，改性复合膜的通量衰减趋势较缓且与污染物之间粘附力都较小，说明UIO-66改性聚酰胺复合膜的抗污染性能有所提升.

Preparation andperformance of UIO-66modified thin-film nanocomposite membrane for forward osmosis

UIO-66 modified thin-film composite membrane for forward osmosis was fabricated by forming polyamide layer via interfacial polymerization. FI-IR, SEM, AFM, XRD, and contact angle have been utilized to characterize UIO-66 and the thin-film nanocomposite membranes (TFN) for forward osmosis.With DI water as feed solution and a 1mol/L NaCl as draw solution,the water flux of TFN0.04 membrane prepared with dispersing 0.04 wt% of UIO-66, reached from 10.28L/(m²·h) to 13.67L/(m²·h)under FO mode and 17.68L/(m²·h) to 20.41L/(m²·h) under PRO mode. Modified composite membrane has improved permeability and better selection performance. Meanwhile, The pollution experiment found that compared with the pure thin film composite membrane, the modified thin film composite membrane has a slower flux decay tendency and less adhesion to contaminant, which indicated that the modified composite membranes is resistant to pollution.