MaterialsChemistryMaterialsChemistryMaterialsChemistryMaterialsChemistryWater,air,andsoilpurificationcanbeecologicallyachievedusingforcesofnaturewithoutharmingtheenvironment.Westudysuchpurificationprocessesutilizingnotonlyphotocatalysts,butalsonaturalclaymineralsasadsorbentsduringsolarlightirradiation.Wearealsoapplyingthetechnologyofphotocatalysistogenerationofelectricity(photofuelcell)andtohydrogenproductionutilizingorganicwastesinordertocreatealternativeenergy.Itisimportanttodevelopsustainableenergytoestablishanecologicalsociety.Thereisademandformaterialswithmolecularrecognitionandseparationabilities.Preciselycontrolledadsorptivepropertiesatamolecularlevelareaprerequisite,andthuswehavebeenorganizingfunctionalorganicgroupsonsilica-basedmaterialstoinduceaselectiveadsorption.Spatialdistributionofthefunctionalgroupsinthesilicamatrixhasbeencontrolledtocreatetheactivesites(e.g.,porousstructures,reactionnano-vessels)futureapplicationsasanartificialenzymeandasensingdevice.Westudyoxidativedegradationofsomepollutantsandwastesandgenerationofelectricityusingthecompositesconsistingofphotocatalystsandnaturalclayminerals.Thistechnologycaninduceeffectiveadsorptionanddegradationoftheorganicsubstancesonthecomposites.Photofuelcellswiththecompositeelectrodescangenerateelectricitywithdisposalofthewastesusingphotocatalyticreaction.Graduatesareworkingactivelyinvariousfields,e.g.environmentalmanagement,waterandairdisposal,andelectronics.Weeducateourstudentssothattheyhavetheirownideastoutilizeforcesofnatureforenvironmentalconservationanddevelopmentofenvironmentally-friendlytechnology.Wehavebeeninterestedinhierarchicallydesignednaturalproductssuchaspreciousstonesandbeautifulanimaltissues.Periodicarrangementsofparticleswithdefinedshapescreatesuchproducts.Hybridizationoffunctionalgroupsonthesurfacesofparticleshasbeeninvestigatedforoptimizingtheperformancesincludingafacileseparationoforganicmolecules,andthedetectionofmoleculesbynakedeyes.Variousmaterialsincludingorganicandinorganicsubstancesaresubjectmattersinpreparationofthesisonadsorbentsandcatalysts.Ourstudentslearnvariouscharacterizingfunctionsofmaterials.Thus,thealumniareactiveinthefieldsofmechanicalandelectronicengineeringaswellaschemistry.instrumentalanalysesforforPhotocatalytic activity of titania can generate electricity by oxidatively degrading one of organic wastes, cellulose, during light irradiation.Photograph of natural clay mineral allophaneTransmission electron microscope (TEM) image of allophane nanoparticles.Silicate nanosheetsand organic functionalities have been used to scaffolds to create nanospacefor molecular recognition.Magnetic nanoparticlesenclosed by a silica microcapsule have been developed for a magnetically collectable, reusable adsorbent and catalyst for concentrating heavy metal ions in acidic aqueous solutions and solid acid catalysis in aqueous media.5 nmHiromasa NishikioriIn the FutureAfter GraduationIn the FutureAfter GraduationProfessorEnvironmentalPhotochemistry,Photocatalysis.TomohikoOkadaAssociate ProfessorHe received his Dr. degree from Waseda University in 2004. His research interests include silica-based adsorbents, and catalysts.Smart Adsorbents/catalysts from Inorganic-organic NanocompositesWater Purification and Energy Development Using Forces of Nature
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