有机污染物在氧化锰上的吸附与脱附行为分析

《有机污染物在氧化锰上的吸附与脱附行为分析》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、Studiesontheadso印tiOn—desO印tionofO唱anicPonutantsatMaganese-oxides／waterinterf．aces^BSTRAcTAdsorptionanddesorptionprocesshasreceivedco八siderableattentionasoneofthemostimportantprocessesaffectingthemobility，degradationandbiologicalactivityoforganicp01lut

2、antsintheenvironment．Desorptionofmanyorganicp011utantsfromnaturalsedimentshasbeenobservedtobeirreversible．Theirreversiblebehavioraffectedtheenvironmentalqualitycriteria，remediationefficiencyandthepOtentialdangerofp011utantsinnaturalwaterbody．Inthisthes

3、is，adsorption—desorptionexperimentswereusedtoinvestigatetheadsorptiOnanddesorptionbehaviOrofmethylOrange．p—chlorophen01andH—acidontoaseriesofabsorbentincluding6Mn02(I)、6Mn02(II)和ⅡMn02．Theinfluenceofsurroundingfactors(pH、temperature、ionsintensity)toadso

4、rptionisothermsofthreeorganismswasdiscussed．Accordingtodifferenttypesofadsorbates，therearethreepartsinmydissertation：(1)theadsorptionanddesorptionofmethylorangeonII】anganeseoxides：(2)theadsorptionanddesorptionofH—acidonmanganeseoxides：(3)theadsorptiona

5、nddesorptionofp—chlorophenolonIi)anganeseoxides。Herearethemainconclusions：(1)pH—variableadsorptionisothermshavebeendeterminedatthreeconcentrationsofNaN03，i．eO．0l、O．05andO。lm01／L．Constant—pHisothermswereobtainedatpH6．OandO．Olmol／乙concentrationofNaN03．Th

6、eresultsshowedthattheadsorptioncapacityminishedalongwiththeincreaseofpHvalueandiOnsintensityinmethylorangeadsorptionsystems．TheadsorptionisOthermskepttothelawofLangmuir．Athightemperaturetheadsorptionon6Mn02(I)andⅡMn02increased，1Ⅳhilethe直塑竖塑塑壅壑些堡：!塑竖塑曼堕

7、堕堑塑塑塞．adsorDtionon6MnOz(II)becamedecreased．Adsorptionanddesorptionisothermswereperformedwithdifferentabsorbateconcentrations(100，200，400mg／L)．TherewasanobviousCpeffectinmethylorangeadsorptionsysteI丁IsandtheadsorptionofmethylorangeontoMnozwas1argelyirre

8、versible(bigadsorptionhysteresis)．TheadsorptionirreversibilityincreasedwiththeincreasingofCp．CirculatiVepHscanningadsorptiondesOrptionexperimentsshowedthatachangetoa1essfavourablepHdidnotcausedesorption，whereasachangein乞heoppositedirect