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Tuning the photocatalytic activity of nanocrystalline titania by phase composition control and nitrogen doping, using different sources of nitrogen
Rozman, Nejc ...
S hidrotermalno metodo smo sintetizirali nanodelce titanovega oksida. Kot izvor titana smo uporabili TiOSO4. Spreminjali smo pH med 0,5 in 1,0 ter dodatek izopropanola v reakcijsko zmes in s tem ...pripravili različne zmesi anataza, rutila in brookita. Vzorce smo tudi dopirali z različnimi deleži dušika, pri čemer smo kot izvor dušika uporabili sečnino, amonijev nitrat in tripropilamin. Vzorce smo karakterizirali z rentgensko praškovno difrakcijo, elektronsko vrstično mikroskopijo na poljsko emisijo, infrardečo spektroskopijo, UV-Vis difuzno refleksijsko spektroskopijo in jim določali specifično površino. Fotokatalitsko aktivnost pa smo merili v reaktoskem sistemu plin-trdno. Ugotovili smo, da nizek pH favorizira nastajanje rutila, medtem ko višje vrednosti pH vodijo do mešanih polimorfnih faz titanovega oksida. Tudi dodatek izopropanola pospešuje nastajanje rutila. V nasprotju z večino literaturnih podatkov je bila v naši raziskavi najbolj fotokatalitsko aktivna rutilna modifikacija. Dopiranje z dušikom pa ne poveča fotokatalitske aktivnosti, ampak jo celo nekoliko zmanjša.
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