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Preface "Special issue: Fundamental understanding of photocatalytic conversions on semiconductor surfaces"

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CatalysisToday206 (2013) 1

ContentslistsavailableatSciVerseScienceDirect

Catalysis

Today

j o ur na l ho me p a g e :w w w . e l s e v i e r . c o m / l o c a t e / c a t t o d

Preface

This Catalysis Today issue contains papers presenting fun-damentalunderstandingofphotocatalytic conversionson semi-conductor surfaces. The latest advances on structure activity relationshipsanddescriptionsofthemechanismofphotocatalytic conversionsaresummarized.Wewouldliketogratefully acknowl-edgeallcontributorstothisissuefortheiroutstandingeffortsand providingcontributionsofhighquality.

ThefocusoftheissueisonTiO2,coveringdescriptionsofbulk

andsurfaceeffects,aswellasphotoreactivitypromotionbydoping withnon-metalsandmetals.Inthefollowingwewillbriefly sum-marizethesecontributions.Thefirstpaperfocusesspecificallyon thepowerofEPRspectroscopyinrevealingactivesitesofanion dopedTiO2.Theprinciplesofthetechnique,difficultiesin

inter-pretationoftheresults,aswellaslessonslearnedfromtheanalysis ofTiO2ofvariablecompositionhavebeensummarized.Thesecond

contributionisanabinitioinvestigationoftheeffectsofnon-metal doping(B,C,NandF)ontheperformanceofAnatase.Thethird contributionprovidesmoredetail ontheeffects ofN-dopingon performanceinthephotocatalyticabatementofNOx. Fundamen-talunderstandingofsurfacemodificationbyfluorineisprovided inthenextcontribution.Thisisfollowedbya descriptionofan operandoDRIFTS(infrared)studyoftheroleofhydroxylsgroups intrichloroethylenephoto-oxidationovertitanateandTiO2

nano-structures.ThenextcontributiondiscussestheeffectofAuonTiO2

basedcatalysisinthehydroxylationofbenzene.Thelastpaperin thisissueprovidesnovelinformationonthephotocatalytic proper-tiesofsilicasupportedsodiumdecatungstateinthephotocatalytic oxidationofglycerol.

Many aspects of TiO2 based photocatalysis have been

thor-oughlyanalyzedandapictureemergesoftheimportanceofvarious structuralandsurfacechemicalparameters.Westronglybelieve futurestudiesshouldfocusonbothphysical(lifetimesofexcited states,fluorescence)andsurfacechemicalcharacterizationof exist-ingandnovelphotocatalysts.Insituspectroscopies(e.g.Infrared, Raman),modeling,andtheoryshouldbeextensivelyexploitedwith theaimtoobtainaclearunderstandingofthephotocatalytic behav-ior.Thiswillultimatelyallowforarationalandsuccessfuldesign ofnewsemiconductormaterials,whichpossesthefollowing char-acteristicsof(i)alow toxicity,(ii)efficientabsorptionofvisible light,(iii)stability(absenceofphoto-corrosion),(iv)highsurface area,(v)largeavailabilityand(vi)lowcost.WehopethisCatalysis Todayissueinspirestoinitiatethesestudies.

GuestEditors PaoloFornasiero GuidoMul∗

JeffreyC.S.Wu UniversiteitTwenteIMPACTInst.P.O.Box217, Enschede,7500AEEnschede,Netherlands

∗Correspondingauthor.Tel.:+31624253955.

E-mailaddress:G.Mul@utwente.nl(G.Mul)

0920-5861/$–seefrontmatter © 2013 Published by Elsevier B.V.

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