NaYF_(4)∶Yb^(3+),RE^(3+)(Ho^(3+)/Tm^(3+))/Bi_(2)WO_(6)的制备及其光催化性能

Preparation and Photocatalytic Activity of NaYF_4∶Yb^(3+),RE^(3+)(Ho^(3+)/Tm^(3+))/Bi_2WO_6

研究采用两步水热法制备以Ho或Tm为激活剂、Bi_(2)WO_(6)为基础光催化剂的复合光催化剂(NaYF_(4)∶Yb^(3+),RE^(3+)(Ho^(3+)/Tm^(3+))/Bi_(2)WO_(6));通过X射线衍射、扫描电镜和光致发光光谱等测试手段对材料的性能进行表征。结果表明:NaYF_(4)∶Yb^(3+),RE^(3+)(Ho^(3+)/Tm^(3+))具有较强的上转换能力,受980 nm光激发后,发射出362 nm、388 nm等可被Bi_(2)WO_(6)利用的光;此外,NaYF_(4)∶Yb^(3+),RE^(3+)(Ho^(3+)/Tm^(3+))复合Bi_(2)WO_(6)后也保留Bi_(2)WO_(6)的物相结构和可见光响应能力;在亚甲基蓝的降解实验中(500 W氙灯辐照),NaYF_(4)∶Yb^(3+),Ho^(3+)和NaYF_(4)∶Yb^(3+),Tm^(3+)的最优摩尔掺杂比分别为4%和2%,两者对亚甲基蓝的去除率为95.59%和96.02%。

A composite photocatalyst(NaYF_4∶Yb^(3+),RE^(3+)(Ho^(3+)/Tm^(3+))/Bi_2WO_6) with Ho or Tm as the activator and Bi_2WO_(6) as the base photocatalyst was prepared by a two-step hydrothermal method;the performance of the material was characterized by XRD,SEM,photoluminescence spectroscopy,etc.The results show that NaYF_4∶Yb^(3+),RE^(3+)(Ho^(3+)/Tm^(3+)) has a strong upconversion ability and emits light that can be utilized by Bi_2WO_(6) after being excited by 980 nm light,such as 362 nm,388 nm,etc.In addition,NaYF_4∶Yb^(3+),RE^(3+)(Ho^(3+)/Tm^(3+)) also retains the Bi_2WO_(6) after compounding with it.The optimal molar doping ratios of NaYF_4∶Yb^(3+),Ho^(3+) and NaYF_4∶Yb^(3+),Tm^(3+) were 4% and 2%,respectively,in the degradation experiments of methylene blue(500 W xenon irradiation),and the removal rates of methylene blue by both were 95.59% and 96.02%.