Synthesis and phosphate uptake behavior of Zr4+ incorporated MgAl-layered double hydroxides

《Synthesis and phosphate uptake behavior of Zr4+ incorporated MgAl-layered double hydroxides》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、JournalofColloidandInterfaceScience313(2007)5363www.elsevier.com/locate/jcisSynthesisandphosphateuptakebehaviorofZr4+incorporatedMgAl-layereddoublehydroxidesRameshChitrakar∗,SatokoTezuka,AkinariSonoda∗,KohjiSakane,KentaOoi,TakahiroHirotsuHealthTechnologyResearchCenter,Natio

2、nalInstituteofAdvancedIndustrialScienceandTechnology(AIST),2217-14Hayashi-cho,Takamatsu761-0395,JapanReceived22January2007;accepted3April2007Availableonline16May2007AbstractWesynthesizedZr4+incorporatedMgAl-layereddoublehydroxides,Mg(AlZr)-LDH(A)(whereAdenotesacounteranioni

3、ntheinterlayerspaceandisexpressedasCO3forcarbonateandClforchlorideions),withdifferentmolarratiosofMg/(Al+Zr).Thenwecharacterizedtheiruptakebehaviortowardphosphateions.CO3-typetertiaryLDHmaterialssynthesizedatroomtemperatureshowlowcrystallinity,whereasthehighlycrystallineCl-

4、typetertiaryLDH,[Mg0.68Al0.17Zr0.14(OH)2][Cl0.26·(CO3)0.04·1.24H2O],wassynthesizedforthefirsttimeusingahydrothermaltreatmentat120◦C.Thedistributioncoefficients(Kd)ofoxo-anionsweremeasuredwithamixedsolutioncontainingtrace−,NO−

5、itysequenceswereCl3-typematerialsandSO

6、materials.ThemaximumphosphateuptakeoftheCO3-typematerialwithamolarratioofMg/(Al+Zr)of3is30mg-P/gatpH8.7withthewastewater,and16mg-P/gatpH8.1withtheseawater,incontrasttothecaseoftheusualbinaryMgAl-LDH(CO3):10mg-P/gwiththewastewaterandlessthan1mg-P/gwiththeseawater.Thelargeupt

7、akeandhighselectivityoftheCO3-typetertiaryLDHmaterialsiswellexplainedbycomplexformationofphosphateionsdirectlywithZr(IV)centersinthelayers.©2007ElsevierInc.Allrightsreserved.Keywords:Layereddoublehydroxides;Phosphate;Seawater;Adsorption;Selectivity1.IntroductionterialisMgAl

8、-LDH(A)[2].Becauseoftheirlargeinterlayerspaceandhighanion-exchangecapacity,LDHmate