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《Removal and Recovery of Toxic Silver Ion Using DeepSeaSea Bacterial Generated Biogenic Manganese Oxides深海有毒有毒銀離子的去除與回收 細(xì)菌生生錳氧化物》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、RemovalandRecoveryofToxicSilverIonUsingDeep-SeaBacterialGeneratedBiogenicManganeseOxides11,211,21YuanjunPei,XiaoChen,DandanXiong,ShuijiaoLiao*,GejiaoWang*1StateKeyLaboratoryofAgriculturalMicrobiology,CollegeofLifeScienceandTechnology,Wuhan,P.R.ofChina,2StateKeyLabo
2、ratoryofAgriculturalMicrobiology,CollegeofBasicSciences,HuazhongAgriculturalUniversity,Wuhan,P.R.ofChinaAbstract++Productscontainingsilverion(Ag)arewidelyused,leadingtoalargeamountofAg-containingwaste.Thedeep-sea2+manganese-oxidizingbacteriumMarinobactersp.MnI7-9ef
3、ficientlyoxidizesMntogeneratebiogenicMnoxide(BMO).The+potentialofBMOforrecoveringmetalionsbyadsorptionhasbeeninvestigatedforsomeionsbutnotforAg.ThemainaimofthisstudywastodevelopeffectivemethodsforadsorbingandrecoveringAgusingBMOproducedbyMarinobactersp.MnI7-9.Inadd
4、ition,theadsorptionmechanismwasdeterminedusingX-rayphotoelectronspectroscopyanalysis,specificsurfaceareaanalysis,adsorptionkineticsandthermodynamics.TheresultsshowedthatBMOhadahigheradsorption+capacityforAgcomparedtothechemicalsynthesizedMnO2(CMO).Theisothermalabso
5、rptioncurvesofBMOandCMObothfittheLangmuirmodelwellandthemaximumadsorptioncapacitiesat28uCwere8.097mmol/gand0.787mmol/g,hforBMOandCMO,respectively.Thechangeinenthalpy(DH)forBMOwas59.69kJ/molindicatingthatitactsprimarilybyhchemicaladsorption.Thechangeinfreeenergy(DG)
6、forBMOwasnegative,whichsuggeststhattheadsorptionoccurs+h+spontaneously.AgadsorptionbyBMOwasdrivenbyentropybasedonthepositiveDSvalues.TheAgadsorptionkineticsbyBMOfitthepseudo-secondordermodelandtheapparentactivationenergyofEais21.72kJ/mol.X-ray+photoelectronspectros
7、copyanalysisshowedthat15.29%AgadsorbedbyBMOwastransferredtoAg(0)andmeantthatredoxreactionhadhappenedduringtheadsorption.DesorptionusingnitricacidandNa2ScompletelyrecoveredtheAg.+TheresultsshowthatBMOproducedbystrainMnI7-9haspotentialforbioremediationandreutilizatio
8、nofAg-containingwaste.Citation:PeiY,ChenX,XiongD,LiaoS,WangG(2013)RemovalandRecoveryofToxicSilverIonUsingDeep-SeaBacterialGeneratedBiogenicMangan
