简介:AdsorptionofgoldonTBPextractingresinfromHClsolutionwasresearched.Alltheeffectsoffactors,suchassolutionacidity,TBPcontent,temperature,etc.,onadsorptionequilibriumwerediscussedandtheequilibriumequationwasformulated.Thebreakthoughtimeofadsorptionprocesswithfixedbedwasstudiedthroughexperiment.
简介:ExactquantumcalculationsofreactionprobabilitieshavebeencarriedoutusinghypersphericalcoordinatesforthecollinearrreactionO+HCl(v<1)-OH(v’<1)+Cl.AgeneralizedLEPSpotentialenergysurfacewithabarrierheightof8.12kcal/molhasbeenusedinthecalculations.Accordingtothecalculatedresultswefoundthat(1)thereactionprobabilityoscillateswithenergy,(2)thereactionprobabilityshowsvibrationaladiabaticity,althoughitispoorerthanthatforsymmetricreactionCl+HC1.Theanalysisofresonancehasalsobeendone.ThereactionrateconstantsandaveragecrosssectionshavebeencalculatedbyTST-CEQmethod.TherateconstantsareinagreementwiththatbyQCTandsmallerthantheexperimentalone.Finally,thethresholdhasbeenestimatedandisingoodagreementwiththatoftheliterature.
简介:Inthispaperstudyonthepropertyandmechanismofadsorptingrheniumfromaqueoushydrochloricacidbyusingmethylphosphorousaciddimythylheptylesterlevextrelresin(CL-P350)isreported.Theeffectsoftime,acidity,concentrationofrhenium,andtemperatureontheadsorptionofrheniumwereinvestigated.ThemechanismofadsorptingrheniumwasdiscussedbychemicalanalyticandIRmethod,anddynamicadscrptionandelutionwerestudied.Experimentalresultsshowthattheadsorptionequilibrationisreachedin4min,thedistributioncoefficient(D)ofRe(Ⅶ)increaseswithincreaseofconcentrationofHClandreachesmaximum3.0-4.0moL/LHCl.ReO4^-istakenupbyionassociationmechanismandcanbedescribedbyLangmuirequationoftheequilibriumstate.ThethermodynamicparametersintheadsorptionprocessofReO4^-havebeendeterminedtobe:ΔH=-29KJ/moL,ΔG=-25KJ/moLandΔS=-13.5J/moLrespectively.Thesaturationadsorptioncapacityofrheniumis19.2mg/gwhenthesolutioncontaining0.372g/LReand3.0mol/LHClwaspassedthroughtheresincolumn.Therecoverypercentageofrheniumis98.4%whiledistilledwaterwasusedasaneluent.
简介:【摘要】:集体备课活动是现代教学中不可或缺的重要内容,说课是集体备课中的重要环节,通过有效措施提高教师说课水平,达到提升集体备课效果的目的,从而整体提高课堂教学质量。
简介:二次根式(a~2)~(1|2)和((a~2)~(1|2))有什么区别吗?主要表现在下面三个方面:1.读法不同.(a~2)~(1|2)读作根号a的平方,而((a~2)~(1|2))读作括号根号a括号的平方.2.表示的意义不同.(a~2)~(1|2)是求a~2。的算术平方根.((a~2)~(1|2))求的是a的算术平方根的平方.一个表示求一