-66-第46卷第1期非金属矿Vol.46No.12023年1月Non-MetallicMinesJanuary,2023叶蜡石镁热还原法制备片状多孔纳米硅的研究李春生1,2*吴小贤1,2（1浙江省地质院，浙江杭州310007；2浙江省非金属矿工程技术研究中心，浙江杭州310007）摘要以层状黏土矿物叶蜡石为前驱体，通过熔盐辅助镁热还原方法制备具有片状多孔的纳米硅材料，采用X射线衍射（XRD）、低温N2吸附、扫描电镜（SEM）等方法研究了不同金属镁添加量、还原温度对制备多孔纳米硅的影响。结果表明，随着金属镁添加量和还原温度的增加，叶蜡石和石英X射线衍射特征峰逐渐减弱，当叶蜡石与金属镁质量比增加到1∶1.0，还原温度为750℃时，叶蜡石和石英结构完全被破坏，SiO2被完全还原成纳米硅；熔盐辅助镁热还原叶蜡石制备的纳米Si具有片状多孔结构，随着还原温度的增加，片状纳米硅比表面积和总孔容逐步减小，平均孔径逐渐增大。关键词叶蜡石；金属镁；镁热还原；多孔纳米硅中图分类号：TB321文献标志码：A文章编号：1000-8098(2023)01-0066-04PreparationofLamellarPorousNanoSiliconbyMagnesiothermicReductionfromPyrophylliteLiChunsheng1,2*WuXiaoxian1,2(1ZhejiangInstituteofGeosciences,Hangzhou,Zhejiang310007;2EngineeringResearchCenterofNon-metallicMineralsofZhejiangProvince,Hangzhou,Zhejiang310007)AbstractThelayeredclaymineralpyrophyllitewasusedasprecursortopreparelamellarmamosiliconporousnanoparticlesiliconmaterialsviaacombinationofmoltensaltandmagnesiothermicreduction.TheeffectsofdifferentmagnesiumadditionsandreductiontemperatureswerestudiedbyXRD,N2adsorptionandSEM.Theresultsindicatedthatwiththeincreaseofmagnesiumcontentandreductiontemperature,theX-raydiffractionpeaksofpyrophylliteandquartzgraduallyweakened.Whenthemassratioofpyrophyllitetomagnesiumincreasedto1∶1.0andthereductiontemperaturewas750℃,thestructureofpyrophylliteandquartzwascompletelydestroyed,andSiO2wascompletelyreducedtonanosilicon;thenanoparticleSipreparedbymoltensalt-assistedmagnesiumthermalreductionpyrophyllitehadlamellarporousstructure.Withtheincreaseofreductiontemperature,thespecificsurfaceareaandtotalporevolumeoflamellarnanosilicongraduallydecreased,whiletheaverageporesizeincreased.Keywordspyrophyllite;magnesium;magne...
