镉在腐殖酸、针铁矿与其复合胶体上的吸持特性分析

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1、两南大学硕十学付论文AbstractAdsorptionandDesorptionBehaviorsofCadmiumon／fromGoethite，HumicAcidandItsCompoundColloidwithHumicAcidsApplicantforMasterDegree：LUOWenqianSupervisor：Prof．WEIShiqiangAbstractAsthecommoncomponentofsoil，goethitewidelyexistsontheeal'thandinfluenc

2、edthetransportionandsedimentofheavymetalinthegroundwithitshugesurfaceandadsorptioncapacity．Humicacid，theextensiveexistingnaturalmaRer，appearsinsoil，sediment，lake，riverandocean．Thecarboxyl，carbonyl，amidoandhydroxylinhumicacidcouldcombinethemineralmaterialofso

3、ilintocompoundcolloid，whichwouldaffecttheenvironmentalchemicalbehaviorofheavymetalinsoil．InChina,withtheexpansionofhumanindustrialandagriculturalactivities，thesoilpollutionbyCadmiumbecomesmoresevere．Therefore，goethite，humicacidandthecompoundcolloidofgoethite

4、andhumicacidwerechosenforthestudyaccordingtokineticsandthermodynamicsresearches，aswellastheimpactfactor(temprature，ionicstrength，pH)．TheadsorptionofindustrialwastewaterbythreesamplesWasalsoincluded．Andtheeffectofthesethreematerialsonadsorptionanddesorptionof

5、Cadmiumwasinvestigatedinordertoprovideadvicesfortheremediationofsoilcadmiumpollutionandtheunderstandingoftheenvironmentalbehaviorinthesoil．TheresultsshowedthattheamountofadsorbedCd2+ingoethite，humicacidandthecompoundcolloidincreasedwiththeconcentrationofCd”．

6、TheadsorptionisothermsofCd2+bythethreesamplescouldsignificantlyconfirmtoLangmuir，FreundlichandLinearequation，whileLangmuirwasthebestone．ThemaximumadsorptionofCd计bythethreetestedsampleswas41．667，38．461，45．455megg，respectively，accordingtOLangmuirequation．Theco

7、mpoundcolloidhadalowerCd2+desorptionratesthangoethiteandhumicacid，whichWasonly1．068％ascomparedto5．871％fromgoethiteand5．918％fromhumicacid，indicatingthatcompoundcolloidhadahigheradsorptionstrengthforcadmium．90％ofabsorbedCd2+wasreachesin75h，whiletheadsorptioneq

8、uilibriumwouldtakemuchmoretime．TthekineticsofCdpdesorptionreactionsbythethreetestedsamplescouldbedividedintotwostages，namelythefastIIl西南大学硕十学1『奇：论文Abstractadsorptionprocesswithin75hours，whichcou