Water　contaminated　with　low　concentrations　of　pollutants　is　more　difficult　to　clean　up　than　that　with　high　pollutant　content　levels.　Membrane　separation　provides　a　solution　for　removing　low　pollutant　content　from　water.　However,　membranes　are　prone　to　fouling,　losing　separation　performances　over　time.　Here　we　synthesized　neutral　(IM-NH2)　and　positively　charged　(IL-NH2)　imidazole　derivatives　to　chemically　functionalize　membranes.　With　distinct　properties,　these　imidazole　grafts　could　tailor　membrane　physicochemical　properties　and　structures　to　benefit　forward　osmosis　(FO)　processes　for　the　removal　of　20-100　ppm　of　Safranin　O　dye　-　a　common　dye　employed　in　the　textile　industry.　The　water　fluxes　produced　by　IM-NH2-　and　IL-NH2-modified　membranes　increased　by　67%　and　122%,　respectively,　with　DI　water　as　the　feed　compared　to　that　with　the　nascent　membrane.　A　39%　flux　increment　with　complete　dye　retention　(∼100%)　was　achieved　for　the　IL-NH2-modified　membrane　against　100　ppm　of　Safranin　O　dye.　Regardless　of　the　dye　concentration,　the　IL-NH2-modified　membrane　exhibited　steadily　higher　permeation　performance　than　the　original　membrane　in　long-term　experiments.　Reproducible　experimental　results　were　obtained　with　the　IL-NH2-modified　membrane　after　cleaning　with　DI　water,　demonstrating　the　good　antifouling　properties　and　renewability　of　the　newly　developed　membrane.　©　2021　American　Chemical　Society.　All　rights　reserved.