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1、第28卷第10期無機(jī)化學(xué)學(xué)報(bào)Vo1.28No.102012年1O月CHINESEJOURNALOFINORGANICCHEMISTRY2198.2204堿式硫酸鎂晶須水熱過程結(jié)晶動(dòng)力學(xué)研究高傳慧-王傳興1許軍武玉民,-李先國(guó)f青島科技大學(xué)化工學(xué)院,青島266042)f2中國(guó)海洋大學(xué)海洋化學(xué)理論與工程技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室,青島266100)摘要:采用水熱法合成了堿式硫酸鎂晶須,利用掃描電鏡、透射電鏡、X射線能譜儀和X射線衍射儀等對(duì)產(chǎn)物的形貌和組成進(jìn)行表征通過考察不同溫度下SO2-濃度隨時(shí)間的變化,對(duì)堿式硫酸鎂晶須的結(jié)晶動(dòng)力學(xué)進(jìn)行了研究。利用MATLAB
2、軟件和Runge.Kutta數(shù)值解法對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行處理,得出不同溫度下晶須的結(jié)晶動(dòng)力學(xué)方程。對(duì)晶須的幾種生長(zhǎng)機(jī)理模型進(jìn)行分析發(fā)現(xiàn).低溫和高溫的動(dòng)力學(xué)模型不同,反應(yīng)溫度為170℃、180℃、190oC時(shí)的動(dòng)力學(xué)模型分別為MB.1、MB.2和MB-3,結(jié)晶機(jī)理為多核控制表面生長(zhǎng).結(jié)晶速率由表面反應(yīng)控制;反應(yīng)溫度為200oC和210℃時(shí),結(jié)晶機(jī)理發(fā)生了變化,為單核控制表面生長(zhǎng),結(jié)晶動(dòng)力學(xué)模型分別為MC.2和MC一3關(guān)鍵詞:堿式硫酸鎂;結(jié)晶;動(dòng)力學(xué);水熱合成中圖分類號(hào):0614.22文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1001—4861(2012)10—2198-07H
3、ydrothermalCrystallizationKineticsofMagnesiumHydroxideSulfateHydrateWhiskersGAOChuan—HuiWANGChuan·XingXUJun‘WUYu—Min'LIXian-Guo(CollegeofChemicalEngineering,QingdaoUnwe~ityofScienceandTechnology,Qingdao,Shandong266042,China)(eyLaboratoryofMarineChemistryTheoryandTechnology,Mini
4、stryofEducation,OceanUniversofChint~Qingdao,Shandong266100,Chi,-~)Abstract:Magnesiumhydroxidesulfatehydratewhiskerswerepreparedbyahydrothermalmethodandscanningelectronmicroscope,transmissionelectronmicroscope,X—raypowderdiffractionandenergydispersiveX-rayspectroscopywereemploye
5、dtoinvestigatecompositionandmorphologyoftheproducts.Crystallizationkineticsofthewhiskerwasstudiedbyanalyzingthechangeofso2一ionconcentrationthroughthehydrothermalprocessatdifferenttemperatures.ExperimentaldatawerehandledusingsoftwareMATLABandnumericalsolutionofRunge-Kuttaandcrys
6、tallizationkineticsequationsatdifferenttemperatureswereobtainedaccordingtotheabovementionedanalysis.Theresultsshowedthatthemechanismforcrystalgrowthwasdifferentwhenthewhiskersweresynthesizedatdifferenttemperatures.Whenthereactionoccurredat170℃,180℃and190oC,thecrystallizationwas
7、controlledbymulti.coresurfacegrowth,andthedynamicmodelsforthecrystallizationwereMB一1,MB-2andMB-3,respectively.Whileitchangedtobecontrolledbysingle—coresurfacegrowthwhenthereactiontemperaturewas200oCor210℃andthedynamicmodelsbecameMC.2andMC一3correspondingly.Keywords:magnesiumhydr
8、oxidesulfatehydrate;crystallization;kinetic;hydrotherm