Abstract:

As the contributor to the primary productivity, alga plays an important role in biogeochemical cycles through bioaccumulationandbiomineralizationofheavymetals.Inthispaper,westudiedtheremovalandmineralizationofPb2+ usingthe microalgae.TheresultsshowthatthemicroalgaehadastrongremovalcapacityforPb2+anditwasafastprocess.Withtheincreasing concentrationofPb2+,theremovalofPb2+alsoincreases.Intheconditionofweakacid(pH=5.0),theremovalofPb2+wasbetter.The removalamountwas423.2×10-3withtheinitialPb2+concentrationof100mg/L,pH5.0,andthecontacttimeof40min.AtomicForce Microscope(AFM)resultsshowedthattheshapeandsizeofthecellhadbeenchangedaftertheinteractionwithPb2+ andthecell surfacebecamerough.FourierTransformInfrared(FT-IR)revealedthatcellsurfacefunctionalgroups,suchascarboxyl,amido,and phosphonates,wereinvolvedintheremovalofPb2+.X-raydiffraction(XRD)patternshowsthat,undertheeffectofmicroalgae,leadions weremineralizedasPb5(PO4)3OH.

Key words: microalgae;plumbum(Pb);biomineralization;AFM