微波水热法制备含氟钛酸铋系光催化剂及光催化性能研究

Microwave-hydrothermal synthesis and photocatalytic properties of fluorine-doped bismuth titanate photocatalysts

以Bi（NO3）3·5H1O和（NH4）2TiF6为原料，采用微波水热法在120℃～220℃反应1h得到了具有不同形貌的粉体．借助XRD、FE—SEM和EDS等分析手段对粉体的组成和形貌进行了表征，并以罗丹明B溶液为目标降解物，研究了200℃下所得粉体的光催化性能．结果表明：所得粉体是一种新型的F掺杂钛酸铋粉体，其中Bi、Ti、O、F的原子比例约为6：11：27：8；随着反应温度的升高，粉体形貌从球形向六棱短柱状转变；紫外光照射下粉体具有较好的降解罗丹明B溶液的能力．

Powders with different morphologies were synthesized by microwave-hydrothermal method at 120 ℃-220 ℃ for 1 h, using Bi（NO3）3 .5H2O and （NH4）2TiF6 as the the raw materials. The powders were characterized by XRD, FE-SEM and EDS. The results indicate that the crystal phase of powders is a new type of F-doped bismuth titanate, in which the molar ratio in Bi, Ti, O and F is 6 ： 11 ： 27 ： 8. With the increase of the reaction tempera- ture, the powder morphology transforms from sphere to six edge short column. The photo- catalytic experiment shows that the sample prepared at 200 ℃ has good photocatalytie prop- erty for the degradation of Rhodamine-B aqueous solution under ultraviolet light.