Hiromasa NishikioriWater,air,andsoilpurificationcanbeecologicallyachievedusingforcesofnaturewithoutharmingtheenvironment.Westudysuchpurificationprocessesutilizingnotonlyphotocatalysts,butalsonaturalclaymineralsasadsorbentsduringsolarlightirradiation.Wearealsoapplyingthetechnologyofphotocatalysistodye-sensitizedsolarcellsimitatingphotosynthesismechanismandtophotofuelcellsutilizingorganicwastesinordertocreatealternativeenergy.Itisimportanttodevelopsustainableenergytoestablishanecologicalsociety.Westudyoxidativedegradationofsomepollutantsandwastesandgenerationofelectricityusingthecompositesconsistingofphotocatalystsandnaturalclayminerals.Thistechnologycaninduceeffectiveadsorptionanddegradationoftheorganicsubstancesonthecomposites.Photofuelcellswiththecompositeelectrodescangenerateelectricitywithdisposalofthewastesusingphotocatalyticreaction.ProfessorEnvironmentalPhotochemistry,Photocatalysis.Red dye on photocatalyst film such as titania can be degraded during light irradiation.Water Purification and Energy Development Using Forces of NaturePhotograph of natural clay mineral allophaneGraduatesareworkingactivelyinvariousfields,e.g.environmentalmanagement,waterandairdisposal,andelectronics.Weeducateourstudentssothattheyhavetheirownideastoutilizeforcesofnatureforenvironmentalconservationanddevelopmentofenvironmentally-friendlytechnology.Transmission electron microscope (TEM) image of allophane nanoparticles.In the FutureAfter GraduationMaterialsChemistryPhotomaskBeforeAfter5 nmTomohikoOkadaThereisademandformaterialswithmolecularrecognitionandseparationabilities.Preciselycontrolledadsorptivepropertiesatamolecularlevelareaprerequisite,andthuswehavebeenorganizingfunctionalorganicgroupsonsilica-basedmaterialstoinduceaselectiveadsorption.Spatialdistributionofthefunctionalgroupsinthesilicamatrixhasbeencontrolledtocreatetheactivesites(e.g.,porousstructures,reactionnano-vessels)forfutureapplicationsasanartificialenzymeandasensingdevice.Wehavebeeninterestedinhierarchicallydesignednaturalproductssuchaspreciousstonesandbeautifulanimaltissues.Periodicarrangementsofparticleswithdefinedshapescreatesuchproducts.Hybridizationoffunctionalgroupsonthesurfacesofparticleshasbeeninvestigatedforoptimizingtheperformancesincludingafacileseparationoforganicmolecules,andthedetectionofmoleculesbynakedeyes.Associate ProfessorHe received his Dr. degree from Waseda University in 2004. His research interests include silica-based adsorbents, and catalysts.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.Variousmaterialsincludingorganicandinorganicsubstancesaresubjectmattersinpreparationofthesisonadsorbentsandcatalysts.Ourstudentslearnvariousinstrumentalanalysesforcharacterizingfunctionsofmaterials.Thus,thealumniareactiveinthefieldsofmechanicalandelectronicengineeringaswellaschemistry.Smart Adsorbents/catalysts from Inorganic-organic NanocompositesIn the FutureAfter GraduationMaterialsChemistry
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