Improved filtration membranes through self-organizing amphiphilic comb copolymers

[摘要] (cont.) This thesis introduces PAN-based UF membranes prepared by this method, using PAN-g-PEO as an additive. Such membranes were shown to exhibit significantly enhanced flux. Furthermore, PAN/PAN-g-PEO blend UF membranes resist irreversible fouling completely, recovering their initial flux completely upon a water rinse or backwash. This property is exceptional, and has not been reported for any other polymeric porous membrane system, to the author;;s knowledge. The fouling resistance of these membranes arises from a steric repulsion of foulant molecules by the PEO brush. The performance of these membranes in the context of the filtration of oily wastewaters, a process severely impacted by fouling, has also been demonstrated in this thesis. PAN/PAN-g-PEO blend UF membranes promise to cut costs and energy use significantly in several UF applications limited by fouling, including municipal and industrial wastewater treatment, MBRs, and separations in the food and pharmaceutical industries. Overall, this thesis was instrumental in extending, developing and understanding the use of the self-organization of amphiphilic comb copolymers in the manufacture of better filtration membranes, and bringing this method closer to industrial application. This approach can be extended to design different comb copolymer chemistries for applications such as heavy metal removal, affinity filtration, and desalination.

[发布机构] Massachusetts Institute of Technology