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자료유형
학술저널
저자정보
Tasbihi, Minoo (Laboratory for Environmental Research, University of Nova Gorica) Stangar, Urska Lavrencic (Laboratory for Environmental Research, University of Nova Gorica) Cernigoj, Urh (Laboratory for Environmental Research, University of Nova Gorica) Kogej, Ksenija (Faculty of Chemistry and Chemical Technology, University of Ljubljana)
저널정보
한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제5호
발행연도
2009.1
수록면
719 - 725 (7page)

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Nowadays, it is a great challenge to synthesize crystalline $TiO_2$ using low-temperature methods without a calcination step. In our study, the anatase $TiO_2$ powders were synthesized using titanium tetrachloride ($TiCl_4$) as a precursor via the sol-gel method at low-temperature preparation conditions. Perchloric acid and nitric acid were used as peptizing mediators. The powders were obtained with consequent drying of the sols via evaporation of the solvent. The remaining acid in the powders prevented the aggregation of particles in the aqueous solution. The as-prepared catalysts were characterized by X-ray diffraction, thermal analysis, UV-Vis spectroscopy, BET surface area. The aggregate size of $TiO_2$ in the colloidal suspension solution was measured by dynamic light scattering. Material characteristics were correlated with photocatalytic activities of the prepared samples towards degradation of aqueous phenol solution under UVA radiation. Using $HClO_4$ instead of $HNO_3$ resulted in smaller colloidal particles of $TiO_2$ in the sol and in higher surface area of the powder, while the primary crystallite sizes for both types of powder were similar. The $HClO_4$-based $TiO_2$ had approximately a 1.5 times higher catalytic activity than similar catalysts prepared by using $HNO_3$. Smaller aggregated colloidal particles, and consequently a larger surface area in $HClO_4$-based powder, demonstrate the main reason for better photocatalytic activity compared to the $HNO_3$-based powder.

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