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以氧化石墨烯(GO)、钛酸四丁酯和硝酸镝为原料,用柠檬酸络合溶胶–凝胶法原位合成氧化石墨烯–镝掺杂二氧化钛(GO/Dy~(3+)–TiO_2),再经硼氢化钠还原得到还原氧化石墨烯–镝掺杂二氧化钛(r GO/Dy~(3+)–TiO_2)复合光催化剂。利用X射线衍射、透射电子显微镜、Raman光谱、荧光光谱对r GO/Dy~(3+)–TiO_2样品进行分析表征。研究了GO的引入对TiO_2晶体结构、形貌、光生载流子寿命和光催化活性的影响。结果表明:锐钛矿相Dy~(3+)–TiO_2呈纳米颗粒状均匀分布在r GO表面;GO的引入可抑制TiO_2晶粒长大及从锐钛矿向金红石的转变;r GO/Dy~(3+)–TiO_2复合光催化剂的光催化活性明显高于Dy~(3+)–TiO_2。
In situ synthesis of graphene oxide - dysprosium - doped titanium dioxide (GO / Dy ~ (3 +) -) with GO, tetrabutyl titanate and dysprosium nitrate as raw materials, TiO 2), and then reduced by sodium borohydride to obtain reduced GO / Dy doped TiO 2 (r GO / Dy ~ (3 +) - TiO 2) composite photocatalyst. The samples of r GO / Dy ~ (3 +) - TiO_2 were characterized by X-ray diffraction, transmission electron microscopy, Raman spectroscopy and fluorescence spectroscopy. The effects of GO on the crystal structure, morphology, photo-carrier lifetime and photocatalytic activity of TiO 2 were investigated. The results show that anatase phase Dy ~ (3 +) - TiO_2 is uniformly distributed on the surface of r GO nanoparticles. The introduction of GO can inhibit the growth of TiO_2 crystal and the transition from anatase to rutile. The r GO / Dy The photocatalytic activity of ~ (3 +) - TiO_2 photocatalyst is obviously higher than that of Dy ~ (3 +) - TiO_2.