Experimental and density functional theory studies of laminar double-oxidized graphene oxide nanofiltration membranes

The type and loading level of oxygen-containing functional groups on graphene oxide (GO) nanosheets significantly affect the size alignment nanochannels formed between GO separation performance laminar membranes. Here, we demonstrate how double-oxidation leads to higher surface charge nanosheets, formation highly stable water-based solution, more-ordered deposition GOs polyethersulfone membrane through pressure-assisted self-assembly method, durable membranes possessing smoother morphology antifouling properties. A multi-technique investigation was applied follow physicochemical difference double-oxidized GO, physical stability corresponding using experimental computational studies. GO-based provided a high water flux 230 L/(m 2 .h) in 2.5 bar transmembrane pressure, excellent rejection 99.9% for methylene blue (MB) dye, outstanding over time. In contrast, showed 81.5% MB, their diminished properties were substantially (~ four times) due negative morphology. density theory (DFT) used gain insight into interactions reasoning mechanical Results revealed that energy decreases by increasing number groups. It also found carboxyl at edges hydrogen bonding, binding energy, more GO-membrane structure. • Synthesis highly-oxidized (HGO) Experimental DFT study HGO Formation percentage bonding HGOs led membrane.