【摘要】 以硝酸铋和十六烷基三甲基溴化铵（CTAB）为Bi和Br源,采用聚乙烯吡咯烷酮（PVP）辅助溶剂热法首次成功制备了多孔纳米片聚结的柿饼状溴氧化铋（BiOBr）。通过多种分析技术对分级微米结构BiOBr材料的物化性质进行了表征,并对其在可见光照射下降解亚甲基蓝（MB）的光催化活性进行了评价。结果表明,溶剂热时间和PVP的加入量对产物的颗粒形貌和结晶度有显著影响。当加入0.7 g PVP时,120℃溶剂热处理12 h,可得到多孔纳米片聚结的柿饼状BiOBr样品。多孔柿饼状BiOBr样品的比表面积为4 m²·g^-1,带隙能为2.64 eV,在可见光区具有较强的光吸收性能,具有良好的可见光驱动降解MB的光催化活性和稳定性。我们推断,多孔纳米片聚结的柿饼状BiOBr样品具有优良的可见光催化性能,这与该样品的较高比表面积、多孔结构、低带隙能以及独特的颗粒形貌有关。更多还原

【Abstract】 Porous nanosheet-aggregated persimmon-like bismuth oxybromide（BiOBr） were successfully prepared for the first time using polyvinyl pyrrolidone（PVP）-assisted solvothermal strategy with bismuth nitrate and cetyltrimethyl ammonium bromide（CTAB） as Bi and Br sources.Physicochemical properties of the hierarchical microstructure BiOBr materials were characterized by means of numerous analytical techniques,and their photocatalytic activities were evaluated for the removal of methylene blue（MB） under visible-light illumination.It is found that the solvothermal time and PVP addition had a significant influence on the particle morphology and crystallinity of the product.The porous sheet-aggregated persimmon-like BiOBr sample could be obtained after solvothermal treatment at 120℃for 12 h in the presence of 0.7 g PVP.The porous persimmon-like BiOBr sample with a surface area of 4 m²·g^-1 and a bandgap energy of 2.64 eV possessed good optical absorption property in visible-light regions and showed excellent visible-light-driven photocatalytic activity and stability for MB degradation.It is concluded that the high visible-light-driven catalytic performance of the porous sheetaggregated persimmon-like BiOBr sample is associated with its high surface area,porous structure,and low bandgap energy as well as the unique particle morphology.更多还原