简介：Bothinorganicandorganicpillaredmontmorilloniteswereusedtoadsorbphenol.BatchkineticsandisothermstudieswerecarriedouttoevaluatetheeffectofequilibriumtimeandpHonadsorptionofphenolbymontmorillouitesandre-adsorbingcharacteristicsofpillaredmontmorillonites.TheadsorptionofphenolincreasedwithincreasingsolutionpHvalues.Theeliminationratioofphenolfromthesolutionbytheabsorptionoforganicmodifiedpillaredmontmorillonite(OrPMt)reachedequilibriumquicklyaftervibratingfor5minutes.Meanwhilefororganicmontmorillonite(OrMt),pillaredmontmorillouite(PMt)andmontmorillonite(Mt),thetimetoreachphenol-absorptionequilibriumwere20,30and90minutes,respectively.Theadsorbingcapacityofthepillaredmontmorillonitemodifiedwithsurfactantimprovedgreatly.Thephenol-adsorbingcapacityofpillaredmontmorillonitesmainlydependedonmicroporousstructureandsurfacecomponentofthemodifiedclays.Aftercalcinationat500℃,thepillarstructureandthebasalspacing(1.83nm)werestillstable.Sothepillaredmontmorillonitecouldberecycled,anditwasapotentialmaterialforadsorbingenvironmentalpollutants.

简介：Thispaperusingfinitedifferenceschemeforthenumericalsolutionofadvection-dispersionequationdevelopsaone-dimensionalwaterqualitymodel.ThemodelalgorithmhassomemodificationoverothersteadystatemodelsincludingQUAL2E,whichhavebeenusedsteadystateimplementationofimplicitbackward-differencenumericalscheme.Thecomputerprograminthedevelopedmodelcontainsaspecialunsteadystateimplementationoffourpointimplicitupwindnumericalschemesusingdoublesweepmethod.Thesuperiorityofthismethodinthemodelingprocedureresultsthesimulationefficacyundersimplifiedconditionsofeffluentdischargefrompointandnon-pointsources.Themodelishelpfulforeyeviewassessmentofdegreeofinteractionbetweenmodelvariablesforstrategicplanningpurposes.ThemodelhasbeenappliedforthewaterqualitysimulationoftheHanjiangRiverbasinusingflowcomputationmodel.Modelsimulationresultshaveshownthepollutantsprediction,dispersionandimpactontheexistingwaterquality.Modeltestshowsthemodelvaliditycomparingwithothersophisticatedmodels.Sensitivityanalysiswasperformedtooverviewthemostsensitiveparametersfollowedbycalibrationandverificationprocess.