Aggregation Kinetics of Multiwalled Carbon Nanotubes in Aquatic Systems: Measurements and Environmen

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2018-08-31 10:11 559阅读次数

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• Aggregation Kinetics of Multiwalled Carbon Nanotubes in Aquatic Systems: Measurements and Environmen

  作者：NAVIDB.SALEH,LISAD.PFEFFERLE,ANDMENACHEMELIMELECH　　（DepartmentofChemicalEngineering,YaleUniversity,NewHaven,Connecticut06520-8286）　　摘要：Theinitialaggregationkineticsofmultiwalledcarbonnanotubes（MWNTs）wereexaminedthroughtime-resolveddynamiclightscattering.AggregationofMWNTswasevaluatedbyvaryingsolutionpHandtheconcentrationofmonovalent（NaCl）anddivalent（CaCl2andMgCl2）salts.SuwanneeRiverhumicacid（SRHA）wasusedtostudytheeffectofbackgroundnaturalorganicmatteronMWNTaggregationkinetics.IncreasingsaltconcentrationandadditionofdivalentcalciumandmagnesiumionsinducedMWNTaggregationbysuppressingelectrostaticrepulsion,similartoobservationswithaquaticcolloidalparticles.Thecriticalcoagulationconcentration（CCC）valuesforMWNTswereestimatedas25mMNaCl,2.6mMCaCl2,and1.5mMMgCl2.AnincreaseinsolutionpHfromacidic（pH3）tobasic（pH11）conditionsresultedinasubstantial（over2ordersofmagnitude）decreaseinMWNTaggregationkinetics,suggestingthepresenceofionizablefunctionalgroupsontheMWNTcarbonscaffold.ThepresenceofhumicacidinsolutionmarkedlyenhancedthecolloidalstabilityofMWNTs,reducingtheaggregationratebynearly2ordersofmagnitude.TheenhancedMWNTstabilityinthepresenceofhumicacidisattributabletostericrepulsionimpartedbyadsorbedhumicacidmacromolecules.OurresultssuggestthatMWNTsarerelativelystableatsolutionpHandelectrolyteconditionstypicalofaquaticenvironments.[详细]

  2018-08-31 10:11

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