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三氯化铁改性膨润土对铬(VI)的吸附性能研究.docx

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三氯化铁改性膨润土对铬(VI)的吸附性能研究 摘要：本文研究了三氯化铁改性膨润土（FeCl3/BT）对铬(VI)的吸附性能。结果表明，FeCl3/BT对铬(VI)具有较高的吸附能力，其吸附量随着铬(VI)浓度的增加而增加，但吸附率下降。在pH值为4.0时，FeCl3/BT对铬(VI)的最大吸附量为20.74mg/g。Langmuir模型和Freundlich模型可以很好地描述FeCl3/BT对铬(VI)的吸附行为。此外，FeCl3/BT对亚甲基蓝（MB）的吸附可用于解决废水中多种污染物的问题，并且可以很好地实现废水的回收利用。 关键词：三氯化铁改性膨润土，铬(VI)，吸附性能，亚甲基蓝 Introduction: Withtherapiddevelopmentofindustryandeconomicgrowth,theriskcausedbypollutionhasbecomeaglobalconcern.Industrialwastewaterdischargeisasignificantsourceofpollution.Amongthem,heavymetalspollutionisamajorenvironmentalproblem.Chromium(Cr)isoneofthetoxicheavymetalsthatseriouslyaffecthumanhealth,anditisoneofthemostcommonpollutantsinindustrialwastewater.Althoughtherearevarioustechnologiesthatcanbeappliedforchromiumremoval,adsorptionisstillconsideredoneofthemostefficientandcost-effectivemethodsforremovingheavymetalsfromwastewater. Bentoniteisakindofnaturalclaymineralwithalargespecificsurfacearea,strongadsorptioncapacity,lowcost,andabundantsourcesthatcanbeusedforremovalofheavymetalsfromwastewater.However,theadsorptioncapacityofbentoniteislimited,whichhaspromptedtheapplicationofsurfacemodificationmethodstoimproveitsadsorptionproperties.Inthisstudy,weinvestigatetheabilityofmodifiedbentonitecontainingFeCl3toremovechromium(VI)fromaqueoussolutions. MaterialsandMethods: BentonitewascollectedfromWenzhou,ZhejiangProvince,China.Themodifiedbentonite(FeCl3/BT)wassynthesizedbyaddingFeCl3solutiontothebentonitesuspensionandstirredfor24hours.Thesolutionwasseparatedbyfiltrationandwashedwithdistilledwaterseveraltimes.Themodifiedbentonitewasthendriedat60°Cfor24hours.Theadsorptionexperimentwascarriedoutinabatchmodebyadding0.1gofFeCl3/BTto25mLofchromium(VI)solutionwithvariousconcentrations.ThepHofthesolutionwasadjustedusingHClorNaOH.Themixturewasshakeninathermostatshakingincubatorataconstanttemperature(25°C)andaconstantshakingspeed(200rpm)foracertaintimeperiod.Aftercentrifugation,thesupernatantsolutionwascollectedtomeasuretheresidualchromium(VI)concentration.Theconcentrationofchromium(VI)wasa