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1、第27卷第3期湖北民族学院学报(自然科学版)Vo.l27No.32009年9月JournalofHubeiUniversityforNationalities(NaturalScienceEdition)Sep.2009几种铁氧化物吸附氟的能力及影响因素的研究杨小洪,魏世勇,李永峰(湖北民族学院化学与环境工程学院,湖北恩施445000)摘要:合成了水铁矿、磁铁矿、针铁矿、赤铁矿四种铁氧化物,研究了它们对氟的吸附量及其影响因素.结果表-明,四种铁氧化物对F的吸附量差异较大,由大到小的顺序为:水铁矿、磁铁矿、针铁矿、赤铁矿.Henry吸附等温式仅能描述针铁矿对氟的吸附;Freun
2、dlich吸附等温式能较好的描述四种铁氧化物对氟的吸附,其相关系数达极显著水平或显著水平;Langmuir吸附等温式能够很好的描述四种铁氧化物对氟的吸附,其相关系数均达极显著水平.pH值和温度可明显影响铁氧化物对氟吸附,在酸性条件下,随着pH升高吸附量下降;而在碱性条件下,随着pH升高吸附量缓慢上升;在中性附近时吸附能力最差.随着温度升高(25~45),吸附量呈增加趋势.关键词:铁氧化物;氟;吸附;吸附等温式;影响因素中图分类号:X131.2文献标识码:A文章编号:1008-8423(2009)03-0248-06FluorideAdsorptionCapacityandIn
3、fluenceFactorsofSeveralIronOxidesYANGXiao-hong,WEIShi-yong,LiYong-feng(SchoolofChemicalandEnvironmentalEngineering,HubeiUniversityforNationalities,Enshi445000,China)Abstract:Theferrihydrite,magnetite,goethiteandhematiteweresynthesizedandcharacterizedusingXRD,SEM,FT-IR,BETandPZC.Theirfluoride
4、adsorptivecapacityandinfluencingfactorswerestudied.Theresultsindicatedthattheadsorptioncapacityofthefourironoxidesvariesgreatly(ferr-ihydrite>magnetite,goethite>hematite).Thesurfacehydroxylquantity,thesuperficialpositivecharge-quantityandspecificsurfaceareaofironoxidesarethekeyinfluencefacto
5、rsadsorbingF.TheH-type-adsorptionisothermsonlycandescribeadsorptionofgoethiteonthefluorine.TheFtypeadsorptioniso-thermscandescribeadsorptionofthefourironoxidesonthefluorine,andthecorrelationcoefficientsreachextremelyremarkableorremarkableleve.lTheL-typeadsorptionisothermscandescribeadsorp-ti
6、onofthefourkindsofironoxidesonthefluorineverywel,landthecorrelationcoefficientsreachtheex-tremelyremarkableleve.lTheinitialpHandthetemperatureobviouslyinfluencetheadsorptionabilityofironoxidesonfluorine.Underacidiccondition,adsorptivecapacitywoulddropwiththepHincreasing,underalkalinitycondit
7、ion,adsorptivecapacitywouldslowlyincreasewiththepHincreasing,adsorptivecapacityislowestatneutrality.Inthetemperaturerange(25~45),theadsorptivecapacitywouldin-creasewiththetemperatureincreasing,whichshowstheadsorptionisaspontaneousandendoergicproce
