褐铁矿纳米结构化相变零价铁及其除磷性能.pdf

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1、矿物岩地球化学通报·纳米地质学·BulletinofMineralogy，PetrologyandGeochemislryVo1．35No．1．Jan．．2016褐铁矿纳米结构化相变零价铁及其除磷性能刘海波，张如玉，陈天虎，陈陈，陈冬合肥工业大学资源与环境工程学院，纳米矿物与环境材料实验，合肥230009摘要：利用x射线粉末衍射仪、x射线荧光光谱仪、热分析仪、场发射扫描电镜表征手段研究了铜陵褐铁矿的矿物组成及其形貌形态特征，通过热处理方式获得褐铁矿纳米结构化相变零价铁作为动态柱填料并探究其除磷性能。结果表明，铜陵褐铁矿主

2、要由针铁矿(>90％)和石英组成，针铁矿晶体呈针状和片状，具纳米尺寸，集合体呈笋状和球状；热处理促使针铁矿进一步纳米结构化相变形成零价铁，具多孔结构、高比表面积特征；零价铁作为动态柱填料净化模拟含磷(5mg／L)废水可运行1年以上，磷去除效率超过99％，出水磷浓度达到城镇污水一级A排放标准(0．5mg／L)。研究结果可促进褐铁矿资源在保护环境中的应用，也为深度处理含磷废水提供一种新材料。关键词：褐铁矿；针铁矿；纳米结构化；相变；除磷中图分类号：P578．12文章编号：1007—2802(2016)O1．0064—06do

3、i：10．3969／j．issn．1007—2802．2016．【)1．008ThePhaseChangeofLimoniteintoZeroValentIronbyNano-StructuringandItsPerformanceonRemovalofPhosphateLIUHai—bo，ZHNAGRu—yu，CHENTian—hu，CHENChen，CHENDongLaboratoryforNanomineralogy&EnvironmentalMateria1．SchoolofResources＆Environme

4、ntalEngineering，H咖UniversityofTechnology，ltefei230009，ChinaAbstract：XRD，XRF，TG／DTGandFESEMwereutilizedtostudycharacteristicsofthemineralphaseandmorphologyot’limonitefromtheTonglingarea．Zerovalentiron(ZVI)waspreparedbythermallytreatinglimoniteinhydrogenandisthenus

5、edtostudytheperformanceonremovalofphosphatefromaqueoussolutioninthispaper．Theresultshowsthattheron—glinglimonitewasmainlycomposedofgoethite(over90％)andquartz．Thegoethiteoccursasnano—sizedacicularandflakycrystalsinbambooshootandballshapedaggregates．Thermaltreatmen

6、tofgoethiteresultedinitsnano—structuringandtheformationofzerovalentironwithpropertiesofporousstructureandlargespecificsurfaceareainthegoethite．Thezerovalentironwasutilizedasfiltertoremovephosphatefromphosphate—bearingwater(5mg／L)andisabletoberunforOVCroneyear，wit

7、htheremovaleficiencyofover99％．ThePconcentrationoftreatedwastewaterislowerthan0．5mg／1whichcansatisfythenationaldischargestandardofpollutantsformunicipalwastewatertreatmentplant．Thiswillfavortheapplicationofthelimoniteinfieldofenvironmentprotectionespeciallyasanewm

8、aterialfortreatingP-containingsewage．，Keywords：limonite；goethite；nano—structuring；phasechange；removalofphosphate褐铁矿一般是由铁硫化物、铁碳酸盐、含铁硅关于针铁矿的研究主要从地球化学、土壤学、矿物酸盐风化氧