Fabrication of pH-sensitive thin-film nanocomposite nanofiltration membranes with enhanced performance by incorporating amine-functionalized graphene oxide

To determine the influence of positively charged graphene-based nanofillers on the nanofiltration (NF) performance as well as strengthen the nanofiller stability in a polypiperazine-amide (PPA) matrix, graphene oxide (GO) was first modified with ethylenediamine (EDA) and polyethylenimine (PEI) to obtain two kinds of aminated graphene oxide (AGO) nanofillers with a positive charge. The characterization results of AGO nanofillers indicated that...