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[3]
Preparation of Polycrystalline TiO2 Photocatalysts impregnated with various transition metal ions: characterization and photocatalytic activity for the degradation of 4-nitrophenol .2 Paola,A,Palmisano,L,Schiavello,M,Uosaki,K,Ikeda,S,Ohtani,B. J. Phys. Chem. B . 2002