【作者】 李宁； 鲁安怀； 秦善； 王河锦； 李巧荣； 刘娟；

【Author】 LI Ning, LU An_huai, QIN Shan, WANG He_jin, LI Qiao_rong and LIU Juan (School of Earth and Space Sciences, Peking University, Beijing 100871, China)

【机构】 北京大学地球与空间科学学院；

【摘要】 天然含钒金红石平均含V2 O5可达1.2 2 % ,Fe2 O3 0 .39% ,ZnO 0 .35 % ,CuO 0 .2 2 % ,这些金属离子可替代八面体中Ti4+ 。V以5价形式存在,配位多面体呈三方双锥,其在晶格内部对Ti的替代导致晶格畸变,打破了配位多面体原有的八面体对称而呈四方双锥的几何形态,并产生结构微应力。透射电镜研究表明,该天然金红石结构内部存在位错、晶界等缺陷,可以成为光催化活性位。对其进行受力、受热以及微波辐射等改性作用后,晶胞发生不同程度的膨胀,可能导致晶格畸变及应变能增加,进一步促进光催化活性。研究结果表明,该天然含钒金红石孕育有良好的光催化活性更多还原

【Abstract】 There exists isomorphous replacement in the rutile structure, and the most prominent feature is the average content of oxides, being 1.22%, 0.39%, 0.35% and 0.22% for V 2O 5, Fe 2O 3, ZnO and CuO respectively. They substitute Ti 4+ in octahedra. The valence of V is 5, and its polyhedron is trigonal bipyramid, which causes the lattice distortion, breaks the raw octahedron symmetry into square bipyramid, and produces the microstrains in the structure. TEM study shows the defects in rutile, which can result in the photocatalytic active location. The crashing, heating and microwave radiation can cause the expansion of the lattice volumes, lattice distortion and increase of energy, promoting photocatalystic activity. It is certain that the natural rutile can gestate good photocatalystic activity.更多还原