简介:CTAB/TX-100microemulsion-basedgel(MBG),whichcouldbesoakedinaqueoussolutionforalongtimewithoutmechanicalstrengthandshapechanges,wassuccessfullyprepared.LipaseimmobilizedinthisgelhadahigheractivitythanthatinCTABMBGwhencatalyzedtheesterificationreactionbetweenn-hexanoicacidandn-octanolanditsenantioselectivitywasslightlyhigherwhencatalyzedthestereoselectiveesterificationreactionbetweenracemicibuprofenandn-octanol.Inaqueoussolution,lipaseinCTAB/TX-100MBGcouldcatalyzesmoothlythehydrolysisreactionofoliveoilandcouldbereusedmanytimeswithouttheevidentchangeofMBGmechanicalstrengthalthoughitsactivitydecreased41.8%afternine-timerecycles.
简介:ThetreatmentofsalicylicacidmanufacturingwastewaterbyNDA-100resinwasinvestigated.ThesorptionintensityofphenolwasfoundtobestronglydependentonpHoftheaqueousphase.EquilibriumadsorptiondatafittobothLangmuirandFreundlichmodels.ThecolumnadsorptionshowedthatthisprocesswassuitableforthetreatmentofsalicylicacidmanufacturingwastewaterAbout99.9%CODcrremovalwasobtainedundertheoptimaloperatingconditions.Theresincouldbecompletelyregeneratedwith1BV8%(w/w)NaOH+2BVH2O,therecoveryof98.9%ofthesubstancewasreached.Thisprocessmakesitpossibletorecoverthevaluablematerialfromthewastewaterandtoimprovetheeffluentwaterquality.
简介:Co(II)-salenwasencapsulatedinMIL-100(Cr)metalorganicframeworkby"shipinabottle"tosynthesizeanewelectrocatalyst,Cosalen@MIL-100(Cr).ThematerialwascharacterizedbyXRD,FT-IR,UV-VisandN2-adsorption.TheCosalen@MIL-100(Cr)modifiedglassycarbonelectrodeexhibitsawell-definedreductionpeakatthepotentialof–0.21Vtowardtheoxygenreductionreaction(ORR)bycyclicvoltammetry(CV)inpH=6.84phosphatebuffer.Almost400mVpositiveshiftofpotentialatCosalen@MIL-100(Cr)modifiedelectrodeforORRcomparedwiththatatbareglassycarbon,indicatesthatCosalen@MIL-100(Cr)possessesexcellentelectrocatalyticactivity.ThetransferrednumberofelectronsforORRwasdeterminedbychronocoulometry.TheresultsuggeststhattheintroductionofCo(II)-salencomplexintoMOFincreasestheelectrocatalyticactivityviaafour-electronreductionpathway.Furthermore,thiselectrocatalystexhibitsgoodstabilityandreproducibility.
简介:Theadsorptionandelectronicpropertiesofisolatedcobaltphthalocyanine(CoPc)moleculeonanultrathinlayerofNaClhavebeeninvestigated.High-resolutionSTMimagesgiveadetailedpictureofthelowestunoccupiedmolecularorbital(LUMO)ofanisolatedCoPc.ItisshownthattheNaClultrathinlayerefficientlydecouplestheinteractionofthemoleculesfromtheunderneathmetalsubstrate,whichmakesitanidealsubstrateforstudyingthepropertiesofsinglemolecules.Moreover,strongdependenceoftheappearanceofthemoleculesonthesamplebiasintheregionofrelativelyhighbias(>3.1V)isascribedtotheimagepotentialstates(IPSs)ofNaCl/Cu(100),whichmayprovideuswithapossiblemethodtofabricatequantumstoragedevices.
简介:本文刻划交换半群的强半格上的最小半格同余,并证明由此得到的商半群为对应的每个交换半群的商半群的强半格。
简介:HeteroepitaxialLaAlO3filmsweregrownonaSrTiO3/Si(100)substratebylasermolecularbeamepitaxyunderdifferentoxygenpressures,andtheirpropertiessuchascrystallinityandelectricalcharacteristicswereexperimentallyinvestigatedusingthevariousmeasurementmethods.Theresultsshowthatmostpropertiesdependmainlyonthedepositionoxygenpressure.ThecrystallinityandtheC-VandI-Vcharacteristicscanbegreatlyimprovedwiththeincreasingoxygendepositionpressure.Moreover,afterannealedat1050~CinN2ambient,theC-VandI-VcharacteristicsofLAOfilmsdepositedattheloweroxygenpressurearealsoimprovedduetothedecreaseofoxygenvacanciesinLAOfilms.