简介:归纳了从钛铁矿中分离铁和二氧化钛的方法,包括亚熔盐法、预氧化法、还原锈蚀法;其次,初步总结了目前国内外制备Fe3O4磁性纳米颗粒和TiO2纳米粒子的方法。最后,对Fe3O4/TiO2复合材料的制备方法包括溶胶-凝胶法、微乳液法、均匀沉淀法作了梳理。Fe3O4/TiO2复合纳米材料很好地解决了单独使用TiO2作为废水处理催化剂,在实际应用过程中易随水流失,难以回收利用的问题,具有一定的实用性。
简介:磁铁矿(Fe3有不同尺寸和形状的O4)nanoparticles被热分解方法综合。二条途径,非注射一个壶和热注射的方法,被设计详细调查生长机制。nanoparticles的尺寸和形状被调整先锋集中和持续时间时间决定,这被发现,它能好在我们的合成系统基于LaMer模型由机制解释了。monodisperseFe3O4nanoparticles从5nm有一条吝啬的直径到16nm,和形状进化从对球形三角形、立方。磁性是尺寸依赖者,和Fe3在关于在房间温度和最大的浸透磁化的5nm展览superparamagnetic性质的小尺寸的O4nanoparticles来临到78emu/g,而Fe3O4nanoparticles当直径增加到大约16nm时,开发铁磁性的性质。
简介:TheinfluenceofcalcinationtemperatureonTiO2nanotubes’catalysisforTiO2/UV/O3wasinvestigated.TiO2nanotubes(TNTs)werepreparedviathesol-gelmethodandcalcinedat300—700℃,whichwerelabeledasTNTs-300,TNTs-400,TNTs-500,TNTs-600andTNTs-700,respectively.TNTswerecharacterizedbytransmissionelectronmicroscopy(TEM)andX-raydiffraction(XRD).ItisfoundthatTNTscalcinedat400℃showedthebestthermalstability.Whenthecalcinationtemperatureincreasedfrom400℃to700℃,thespecialstructureoftubeswasdestroyedandgraduallyconvertedintonanorodsand/orparticles.Thetransformationfromanatasetorutileoccurredat600℃,andtherutilephasewasenhancedwhenthecalcinationtemperaturewasincreasedtoover600℃.Thecalcinationtemperature’sinfluenceonTNTs’adsorptionactivityforchemicaloxygendemand(COD)andcatalyticactivityforTiO2/UV/O3wasinvestigatedinlandfillleachatesolution.Inlandfillleachatesolution,theadsorptionactivityofCODdecreasedinthereducedorderofTNTs-300,TNTs-400,TNTs-500,TNTs-600andTNTs-700.Inphotocatalyticozonation,TNTs-400showedthebestcatalyticactivitywhileTNTs-700exhibitedtheworst.Inotherthreeprocesses,theCODremovalofTNTs-300/UV/O3washigherthanthoseofTNTs-500/UV/O3andTNTs-600/UV/O3inthefirst20min,andthenbecameclosetothoseofthelattertwointhefollowing40min.ComparedwithTNTs-300andTNTs-400,TNTs-600hadthebestanti-foulingactivity,whileTNTs-500andTNTs-700hadloweranti-foulingactivitythantheformerthree.Inphotocatalyticozonation,thecalcinationtemperatureof400℃wasappropriatewhenTNTswereobtainedatthesynthesistemperatureof105℃.
简介:Thenanomaterialsoftenexhibitveryinterestingelectrical,optical,magnetic,andchemicalproperties,whichcannotbeachievedbytheirbulkcounterparts[1-7].Thedevelopmentofuniformnanometersizedparticleshasbeenintensivelypursuedbecauseoftheirtechnologicalandfundamentalscientificimportance[8-15].Itissignificantthatnanostructuredmaterialscanbecontrollablyassembledintotherequiredgeometryontosubstrates,becomingthebasisofthenextgenerationofcomponentsanddevices[16-31].Thedevelopmentofnewmethodsandstrategiesfororganizingthenanoparticlebasicbuildingblocksintothedesiredstructuresisrequired.Superlatticesmadefromthesebuildingblocksgiveustheopportunitytostudynotonlythepropertiesoftheindividualbuildingblocks,butalsocollectiveeffects.Thesuperparamagneticironoxidenanocrystals(NCs)havebeenusedinthefieldsofbio-medicine,ferrofluids,refrigerationsystem,catalysis,particularlyinmagneticresonanceimaging,tissueengineering,anddrugdeliveryapplications[32-42].
简介:利用室温液相还原、晶种生长的方法,成功的制备了大小形貌均一、性能稳定且具有磁性的Fe3O4@Cu2O复合纳米粒子,并且对制备的Fe3O4@Cu2O纳米粒子进行了光催化性能的研究.在以紫外光为光源的照射下,合成的Fe3O4@Cu2O纳米粒子对有机染料甲基蓝溶液起到很好的降解作用.更重要的是,在外加磁场的作用下,Fe3O4@Cu2O纳米粒子容易回收,具有良好的可循环利用性能.
简介:有从30~80nm的尺寸的Fe3O4nanoparticles被湿milling铁粉末在一家行星的球工厂综合。阶段作文和同样综合的产品的形态学被X光检查衍射(XRD)测量,扫描电子显微镜学(SEM)和传播电子显微镜学(TEM)。NanosizedFe3O4粒子被湿milling准备金属性的铁粉末(?200网孔,99%)在与不锈钢装备的一家行星的球工厂,使用的小瓶与50:1并且以300rpm的旋转速度的ball-to-powder团比率在提取的水下面熨球。在这个方法的铁球的使用在Fe3O4formation起了一个关键作用。现在的技术简单,这个过程是容易的执行。