WO3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WO3颗粒和WO3纳米管基体,采用水热还原法制备出不同质量比的WO3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WO3与Ag的复合并未改善其光催化性能,水热法制备的WO3纳米管在与银复合后一定程度上提高了WO3的光催化效果。为了进一步提高其催化效率,把Ag/WO3与上转换材料NaYF4∶Yb,Er进行了复合,并对其进行了光催化实验。实验证明Ag/WO3与上转换材料NaYF4∶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NaYF4∶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(WO3) has strong photocatalytic activity under ultraviolet light and weak photocatalytic activity under visible light.In order to improve its photocatalytic performance,WO3 particles and WO3 nanotube matrix were prepared by pyrolysis and hydrothermal method respectively,and WO3 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 WO3 was not improved by the combination of Ag and WO3 prepared by pyrolysis.The photocatalytic activity of WO3 nanotubes prepared by hydrothermal method was improved to some extent by the combination of Ag and WO3.In order to further improve the utilization of visible light,Ag/WO3 was compounded with up-conversion materials NaYF4∶Yb and Er,and photocatalytic experiments were carried out.The results shown that the mass concentration of Ag/WO3 and upconversion material NaYF4∶Yb and Er is 0.25,and the concentration of rhodamine B decreased obviously during dark reaction.The results shown that the combination of NaYF4∶Yb and Er had good adsorption performance,and played a certain role in the treatment of environmental pollution.
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