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1、waterresearch43(2009)2907–2915Availableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/watresRemovalofphosphatefromaqueoussolutionbythermallytreatednaturalpalygorskitea,ba,aaaFangqunGan,JianminZhou*,HuoyanWang,ChangwenDu,XiaoqinChenaStateKeyLaboratoryofSoilandSustainab
2、leAgriculture,InstituteofSoilScience,ChineseAcademyofSciences,210008Nanjing,ChinabGraduateUniversityofChineseAcademyofSciences,100049Beijing,ChinaarticleinfoabstractArticlehistory:ThepotentialofactivatedpalygorskitewasassessedforsorptionofphosphatefromReceived8January2009aqueoussolut
3、ion.ThenaturalpalygorskiteusedwastreatedbythermalactivationoverReceivedinrevisedform1001000Cfor2h.Thethermalactivationincreasedthephosphatesorptioncapacityand25March2009thehighestphosphatesorptioncapacityoccurredat700C.H700(palygorskiteheatedatAccepted31March2009700C)showedhighers
4、orptionratethannaturalpalygorskite(NPAL),andtheremovalwasPublishedonline14April2009favorableinacidicmedia.ThesorptiondataweredescribedusingFreundlichisothermequationovertheconcentrationrange(51000mg/L)(25C).CalciumboundphosphorusKeywords:wasthemainfractionoftheadsorbedphosphorus,abo
5、ut98.0%inNPALand58.2%inH700,ThermallytreatedpalygorskitebuttheextractiveCaPspeciesvariedgreatly,Ca2Pwas87.7%inNPALand3.0%inH700,StructurechangesCa8Pwas10.1%inNPALand54.5%inH700,andmetalboundphosphoruswaslessthan2%Physico-chemicalpropertiesinNPALbutmorethan41.4%inH700,respectively.The
6、dependenceofthephosphatePhosphatesorptioncapacityintheheatingsamplesonthermalactivationappearstoberelatedtomajorchangesinthecrystalstructureofpalygorskite,andmorecalcium,ironandaluminumwerereleasedfromthecrystalmatrixat700C,whichpromotedphosphorussorption.ª2009ElsevierLtd.Allrightsr
7、eserved.1.Introductionprecipitationandbiologicalmethodsarewidelyacceptedmethodsofphosphateremovalatindustriallevel(Karacaetal.,Phosphoroushaslongbeenrecognizedasanimportant2006;Kostantionsetal.,2007).Extensiveresearcheshavealsoelementinplantnutrition.Inthe1970s,attentionhasbeenbeenca
8、rriedouttoco
