摘要
Sr-doped nanostructured crystalline TiO2 microspheres were fabricated by modifying the bare microspheres with the method of soaking in strontium nitrate solution and heat treatment.The morphology,crystal structure and photoabsorption ability were characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD） and UV-Vis spectrophotometer.The observation of SEM showed that both the bare and Sr-doped microspheres presented the same honeycomb porous morphology.The XRD spectra affirmed that the incorporation of Sr was in the form of strontium titanate(SrTiO3) as eutectic structure with anatase TiO2.The photocatalytic efficiency of Sr-doped TiO2 microspheres was assessed by monitoring the photodecomposition of KN-R dye.The results reveal that Sr-doped microspheres provided a higher efficiency than the unmodified,which was consistent with the analysis results of UV-Vis absorption spectra.Obvious phenomenon of red-shift on UV-Vis spectrum was seen in comparison with the bare microspheres.Both the phenomena of red-shift and the photocatalytic activity improvement were attributed to the synergistic action between SrTiO3 and anatase TiO2.
Sr-doped nanostructured crystalline TiO2 microspheres were fabricated by modifying the bare microspheres with the method of soaking in strontium nitrate solution and heat treatment. The morphology, crystal structure and ph diffraction （ XRD ） Sr-doped microsph tion ability were characterized by scanning electron microscopy （SEM）, X-my and UV-Vis spectrophotometer. The observation of SEM showed that both the bare and eres presented the same honeycomb porous morphology. The XRD spectra affirmed that the incorporation of Sr was in the form of strontium titanate （ SrTiO3 ） as eutectic structure with anatase TiO2. The photoeatalytic efficiency of Sr-doped TiO2 microspheres was assessed by monitoring the photodecomposition of KN-R dye. The results reveal that Sr-doped microspheres provided a higher efficiency than the unmodified, which was consistent with the analysis results of UV-Vis absorption spectra. Obvious phenomenon of red-shift on UV-Vis spectrum was seen in comparison with the bare microspheres. Both the phenomena of red-shift and the photoeatalytic activity improvement were attributed to the synergistic action between SrTiO3 and anatase TiO2.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第2期346-348,共3页
Chemical Journal of Chinese Universities
基金
天津市科技攻关重点研究项目(批准号:043182511)资助
