Temperature Effect on Boron Adsorption—Desorption Kinetics in Soils-中国Betway体育网页登陆

摘要 Theeffectoftemperatureonthepropertiesofboronadsorption-desorptioninbrown-redsoil,yellowbrownsoilandcalcareousalluvialsoilofHubeiProvincewasinvestigatedwiththemobiledisplacementtechnique.TheexperimentaldataofBadsorption-desorptionamountsandreactiontimeat25and40℃werefittedbythezero-order,first-orderandparabolicdiffusionkineticequations.Theadsorptionprocesswasinconformitywiththeparabolicdiffusionlawatboththetemperatures,andthevaluesofrateconstantoftheparabolicdiffusionequationinBadsorptionwere0.138,0.124and0.105mgkg^-1min^-1/2at25℃,and0.147,0.146and0.135mgkg^-1min^1/2at40℃forthebrown-redsoil,yellow-brownsoil,andcalcareousalluvialsoil,respectively,TherelationshipbetweenamountofBdesorptionandreactiontimecouldbewelldescribedbythefirst-orderkineticequation,andthecorrespondingvaluesofrateconstantwere0.0422,0.0563and0.0384min^-1at25℃,and0.0408,0.0423and0.0401min^-1at40℃forthebrown-redsoil,theyellow-brownsoilandthecalcareousalluvialsoil,respectively.Therefore,thedesorptionprocessofBmightberelatedtotheamountofBadsorbedinsoil,Thehigherthtemperature,thelowertheamountofBadsorptionofthesamesoilinthesamereactiontime,ThevaluesoftheapparentactivationenergyofBadsorptioninthethreesoilscalculatedwiththerateconstantsofparabolicdiffusionequationwere3.27,8.44and12.99kJmol^-1,respectively,basedontheexperimentaldataofBadsorptionamountsandreactiontimeatand40℃.

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Temperature Effect on Boron Adsorption—Desorption Kinetics in Soils

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