温和条件下混合碱辅助水热合成硅酸镁纳米管.pdf

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1、第29卷第7期无机化学学报V01．29No．72013年7月CHINESEJOURNALOFINORGANICCHEMISrrRY1333—1338温和条件下混合碱辅助水热合成硅酸镁纳米管陈兰花李轩郭向可郭学锋丁维平(南京大学化学化工学院，南京210093)摘要：在混和碱的辅助下，以普通氢氧化镁和二氧化硅粉末为原料在温和条件．F高效合成硅酸镁纳米管。采用XRD，TEM．FTIR，氮气吸附等多种手段对产物进行了表征，并对其合成过程进行了研究。结果表明氢氧化钠和氢氧化钾的共融液能提高反应物间的溶解性，促进反应可以在温和条件下加快进行。250

2、℃下合成硅酸镁纳米管，传统水热法至少需要7d．混合辅助水热合成只需36h。与传统的水热法相比，混和碱辅助的水热法是一种温和且高效的过程。关键词：纳米管；水热合成；硅酸镁；混合碱；共熔液中图分类号：0613．72；O614．22文献标识码：A文章编号：1001—4861(2013)07—1333—06DOI：10．3969／j．issn．1001—4861．2013．00．277Composite--Hydroxide--AssistedHydrothermalSynthesisofMagnesiumSilicateNanotubeCHE

3、NLan—HuaLIXuanGUOXiang—KeGUOXue—FengDINGWei—Ping(KeyLaboratoryofMesoscopicChemistryofMOE,SchoolofChemistryandChemicalEngineering,NanjingUnive~ity,Nanjing210093，China)Abstract：Amildandhighlyeficienthydrothermalsynthesismethodforuniformmagnesiumsilicatenanotubeswasdevelope

4、dfromnormalMg(OH)2andSiO2powderswiththeassistanceofpotassiumhydroxideandsodiumhydroxide．ThesampleswerecharacterizedbyXRD，TEM，IR，andnitrogenadsorption—desorption．ThesyntheticprocesswasstudiedbyXRD，TEM，etc．Theresultsindicatethattheeutecticsolutionofpotassiumhydroxideandsod

5、iumhydroxideoffershigherdissolvabilityforthereactantsandbenefitsthereactionbetweenthereactants．Thiscomposite--hydroxide-assistedapproachisamildandhighlyefficientprocedureforthesynthesisofhighqualitymagnesiumsilicatenanotubesat250℃inashortdurationof36hours．whileitneedsove

6、r7daysat250oCfortraditionalhydrothermalmethod．Keywords：nanotube；hydrothermalsynthesis；magnesiumsilicate；composite—hydroxide；eutecticsolutionSincethediscoveryofcarbonnanotubesin1991manyotherinorganicnanotubeshavebeenintensivelybyIijima_lJ，one-dimensional(1D)nanostructures

7、withexplored。．Amongthem．magnesiumsilicate．espe—hollowinteriorshaveattractedmuchattentionduetociallyMg3Si205(OH)4nanotubes，haveattractedspecialtheirmarkedshape—specificandquantumsizeeffects~2"41．interestsbecauseoftheirstructuralsimilaritytotheTheuniquephysicalandchemicalp

8、ropertiesofthenaturalmineralchrysotileandtheirimportanttubular．structuredmaterialshavebeenwelldocume．ap