含Sr纳米晶粒二氧化钛多孔微球的制备与表征

半导体光催化剂引发的光化学反应被广泛地应用到有毒有机污染物的深度处理、 光有机合成、 能量的转化与存储等研究领域1~5]. 其中, 利用半导体二氧化钛光催化降解有机污染物受到了广泛的关注. 近年来, 通过掺杂和负载重金属-6]和金属氧化物7]等方法来改性二氧化钛, 虽然在一定程度上提高了其光催化活性, 但是没有彻底解决催化剂回收和重复使用的问题.本文通过溶液浸渍和高温处理的方法合成了含Sr纳米晶粒二氧化钛多孔微球, 在保证了二氧化钛微球粒径较大、 易于回收和重复使用等优点的同时, 使其降解活性艳蓝的活性提高了2倍, 具有较为广阔的应用前景.

Preparation and Characterization of Sr-doped TiO-2 Nanocrystal Microspheres

Sr-doped nanostructured crystalline TiO_(2) 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(SrTiO_(3)) as eutectic structure with anatase TiO_(2).The photocatalytic efficiency of Sr-doped TiO_(2) 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 SrTiO_(3) and anatase TiO_(2).