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1、哈尔滨工业大学工学硕士学位论文AbstractPromisinglythegapofthephosphorussupplywillbe10milliontonsin2020.Andatthesametime,thedischargeamountofphosphatewithwastewateris0.207milliontonsmerelyinthetownperyear.Thedrainofphosphorusnotonlybringshugeresourcewaste,butalsocausesse
2、riousenvironmentalpollution.Soitisveryurgenttofindamethodwhichwillrealizethephosphorusrecyclingandsustainableutilization,reducingeconomicandenvironmentallosscausedbyphosphoruspollution.TheZn-AlHTLCswithZn/Almolarratioof2.0wasaynthesizedwhichshowedhighpho
3、sphateadsorptioncapacity.Zn-Al-2HTLCswasmodifiedbydopingLa,thentheadsorption,desorption,regenerationoftheadsorbentsandrecoveryphosphatefromthedesorptionsolutionwerestudiedinthispaper.Firstly,aseriesofhydrotalcite-likecompounds(HTLCs)withdifferentZn/Al/La
4、molarratiowereaynthesized.TheXRD,TG-DSC,BETanalyticalresultsshowedthattheHTLCssamplewithZn/Al/La=2:0.9:0.1hadseveraladsorptionadvantages,suchassinglecrystalphase,goodcrystallinity,biglayerspacingandlargesurfacearea.ThentheHTLCswithmolarratioZn/Al/La=2:0.
5、9:0.1werecalcinatedatdifferenttemperaturefor4h.Analysisingthecrystalstructure,sufureareaandSEMgraphofthecalcinatedsampleofZnAlLa(2:0.9:0.1)HTLCs(ZnAlLa-HTLCsforshort),wegotthatZnAlLa-HTLCs-300wasZn,Al,Lacomplexmetaloxides，whichhad“memoryeffect”.Intheproc
6、essofcalcinationthesurfaceareaandporevolumeincreasedbecause
theinterlayerwaterandinterlayeranion(CO32-)removed.Thustheadsorption
capacityofZnAlLa-HTLCs-300wasimproved,andthenourteamaynthesizeda
kindofadsorbentwithgoodphosphateadsorptioncapacity.Theadsorp
7、tionpropertyofZnAlLa-HTLCs-300wasinverstigated;
phosphateuptakewasupto56.92mg/g.ThepHvaluehadcertaininfluenceon
theadsorptionprocess,andpH6~10wasdeterminedasthebetterpHworking
rangeoftheadsorbent,ifthepHwastoolowortoohigh,theadsorbentwas
dissolvedpartly.
8、ZnAlLa-HTLCs-300adsorbenthadgoodadsorptionselectivity,
namely:CO32-＞SO42-＞Cl-＞NO3-.-III-哈尔滨工业大学工学硕士学位论文ZnAlLa-HTLCs-300canbeusedforsixtimesintherecyclingofadsorption-desorptionwith5%NaOHsolution-regenerationwith25%MgCl2sol
