简介:【内容摘要】统编教材从一年级起就安排了众多的分类练习,随着年级的升高,分类的要求也随之提升;中年级到高年级,除了继续进行分类积累词语、专项的分类练习以外,还引导学生将分类的方法运用于阅读与习作中。因此,在语文教学中字、词、阅读、写作的分类学习用到思维导图会优化学生的学习。
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.