摘要
以多孔Al_2O_3纤维为载体,应用水热方法使Bi_2WO_6在纤维上原位生长。利用XRD、SEM等分析测试手段对样品进行表征,研究了在水热温度为180℃条件下,不同水热保温时间和p H值对纤维上Bi_2WO_6形成及结晶形貌的影响。分析评价了负载有Bi_2WO_6的多孔Al_2O_3纤维在可见光辐照下对Rh B溶液的光催化降解性能。结果表明,Bi_2WO_6微晶不仅能够在比表面较大的多孔Al_2O_3纤维上原位生长,且致密均匀,并具有良好的针状结晶形貌。不同的水热保温时间和p H值对应生成的Bi_2WO_6结晶形貌以及光催化性能也呈现一定的规律,在保温时间为9 h,p H=1的条件下,Bi_2WO_6生长的最为致密均匀,且保持多孔结构,在60 min内可使Rh B降解95%。
Bi2WO6 crystallites were successfully grown on porous alumina fibers by a hydrothermal method. The samples were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）, respectively. At 180℃, the influence of hydrothermal holding time and pH value on the formation of Bi2WO6 and its crystalline morphology was mainly investigated, and their photocatalytic degradation performance under visible-light irradiation evaluated. The results show that Bi2WO6 crystallites in-situ grown on porous alumina fibers ＂are not only dense and homogeneous, but also presents needle-like crystalline morphology. Moreover, their crystalline morphology and photocatalytic performance also varied with hydrothermal holding times and pH values. When the holding time is 9 h, and pH value is 1, the desirable crystalline morphology of Bi2WO6 crystallites on porous alumina fibers can be obtained, while the samples still possess porous structure. Their degradation rate of RhB solutions can reach 95% within 60 rain.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2016年第7期2054-2058,共5页
Bulletin of the Chinese Ceramic Society
