简介：Biocharisapotentialcarrierfornutrientsduetoitsporousnatureandabundantfunctionalgroups.However,rawbiocharhasalimitedorevennegativecapacitytoadsorbphosphate.Toenhancephosphateremovalandreducephosphatereleases,acidic,alkaline,andsurfactantpretreatments,followedbygranulationandferricoxideloading,wereappliedtorawbiocharpowder(Bp).Thealkalinepretreatmentprovedtobethemosteffectivemethodandexhibitedsignificantporeexpansionandsurfaceoxidation.Bg-OH-FOshowedthehighestphosphateremovalefficiencyat99.2%(initialphosphateconcentrationof20mg/L)aftergranulationandferricoxideloading.StaticadsorptionresultsindicatedthatapHvalueof4wasthemostsuitableforphosphateadsorptionbecauseofthesurfacepropertiesofBg-OH-FOandthedistributionofP(V)inwater.Highertemperaturesandalargerinitialphosphateconcentrationledtobetteradsorption;theadsorptioncapacityofBg-OH-FOwas1.91mg/gat313Kwithaninitialphosphateconcentrationof50mg/L.TheBg-OH-FOadsorptionprocesswasendothermicinnature.TheFreundlichmodelseemedtobetheoptimumisothermmodelforBg-OH-FO.Undercontinuousadsorption,theflowrateandbeddepthwerechangedtooptimizetheoperationconditions.Theresultsindicatethataslowflowrateandhighbeddepthhelpedincreasetheremovalefficiency(g)ofthefixedbed.ThebreakthroughcurvesfittedwellwiththeYoonNelsonmodel.