银掺杂三氧化钨复合上转换材料的制备与表征

Preparation and characterization of Ag-doped WO_(3) composite upconversion material

WO_(3)本身在紫外光下具有很强的光催化性能,在可见光下能力较弱。为了改善其光催化性能,通过热解法和水热法分别制备出WO_(3)颗粒和WO_(3)纳米管基体,采用水热还原法制备出不同质量比的WO_(3)与Ag复合的光催化剂。以罗丹明B为目标降解物,对其光催化性能进行了测试。结果表明:热解法制备的WO_(3)与Ag的复合并未改善其光催化性能,水热法制备的WO_(3)纳米管在与银复合后一定程度上提高了WO_(3)的光催化效果。为了进一步提高其催化效率,把Ag/WO_(3)与上转换材料NaYF_(4)∶Yb,Er进行了复合,并对其进行了光催化实验。实验证明Ag/WO_(3)与上转换材料NaYF_(4)∶Yb,Er质量比为0.25时,在暗反应过程中罗丹明B浓度有明显的下降。通过实验表明与上转换材料NaYF_(4)∶Yb,Er的复合使其具有了良好的吸附性能,在对处理环境污染起到了一定作用。

Tungsten oxide(WO_(3))has strong photocatalytic activity under ultraviolet light and weak photocatalytic activity under visible light.In order to improve its photocatalytic performance,WO_(3)particles and WO_(3)nanotube matrix were prepared by pyrolysis and hydrothermal method respectively,and WO_(3)and Ag composite photocatalysts with different mass ratios were prepared by hydrothermal reduction method.The photocatalytic properties of rhodamine B degradation products were tested.The results showed that the photocatalytic activity of WO_(3)was not improved by the combination of Ag and WO_(3)prepared by pyrolysis.The photocatalytic activity of WO_(3)nanotubes prepared by hydrothermal method was improved to some extent by the combination of Ag and WO_(3).In order to further improve the utilization of visible light,Ag/WO_(3)was compounded with up-conversion materials NaYF_(4)∶Yb and Er,and photocatalytic experiments were carried out.The results shown that the mass concentration of Ag/WO_(3)and upconversion material NaYF_(4)∶Yb and Er is 0.25,and the concentration of rhodamine B decreased obviously during dark reaction.The results shown that the combination of NaYF_(4)∶Yb and Er had good adsorption performance,and played a certain role in the treatment of environmental pollution.