This issue of Greensusmater (Vol. 2 No. 1, 2025) presents a collection of studies at the intersection of sustainable materials science and environmental engineering. The highlighted works explore advanced nanofiber membranes for dye and fatty acid removal, including zeolite-enhanced PAN/PVDF composites and edible bird’s nest-derived nanofibers. Other contributions delve into the optimization of PVDF-co-HFP polymer systems for tunable membrane properties and activated carbon from natural biomass for cooking oil purification. A theoretical study on k-point mesh density for accurate DFT modeling of graphene rounds out the issue, offering a balanced perspective of experimental and computational advancements.