巯基化Zr-MOFs/聚酯无纺布复合材料制备及应用

重金属和有机溶剂是水体中常见的污染物，十分有必要开发能够吸附重金属并同时分离有机溶剂的多功能复合材料。本论文以聚酯无纺布（NWF）为基底，经聚二甲基硅氧烷（PDMS）表面改性，进而采用原位生长方式将巯基化锆基金属有机骨架化合物（Zr-MOFs，简称PCN-222）负载在无纺布表面，制备了一种疏水的PDMS/PCN-222@NWF复合材料。在低表面能PDMS改性和原位生长PCN-222晶体所形成的粗糙表面共同作用下，其水接触角为141.7°。油水分离测试结果显示其分离效率最高可达98.6%，并且经过5次循环使用后，分离效率仍然可达94%以上。此外，由于无纺布表面负载有巯基化PCN-222颗粒，PDMS/PCN-222@NWF复合物可同时吸附水中的Hg²⁺，最高吸附量达294.4mg/g。

Preparation and application of mercapto-functionalized Zr-MOFs/polyester fabric composite

Heavy metal ions and organic solvents are common pollutants in water. It is important to develop multifunctional composites to simultaneously remove heavy metal ions and separate organic solvents from water. In this study, a hydrophobic composite (PDMS/PCN-222@NWF) was successfully prepared via surface modification of PDMS and in situ growth of the mercapto functionalized Zr-MOFs (PCN-222) on the surface of the polyester non-woven fabric (NWF). The as-prepared composite had a water contact angle (WCA) of 141.7°, which was probably attributed to both the rough surface derived from in situ growth of PCN-222 crystals and the low surface energy due to coating of hydrophobic PDMS. The PDMS/PCN-222@NWF composite can effectively separate oil-water mixture with a maximum separation efficiency about 98.6%, and the separation efficiency can still reach above 94% after 5 cycles of reuse. In addition, the PDMS/PCN-222@NWF composite can also selectively remove Hg²⁺ ions from water with a maximum adsorption capacity of 294.4mg/g due to the coating of mercapto functionalized PCN-222 crystals on the surface of non-woven fabric.