CuO-Ag复合光催化剂对甲基橙的降解性能研究

Study on Degradation of Methyl Orange by CuO/Ag Composite Photocatalyst

采用水热法制备纳米CuO,并通过沉积法将Ag负载。通过粒度仪和X-射线衍射仪对合成的纳米CuO、CuO/Ag复合材料的大小、物相进行了测定。通过紫外-可见光谱对CuO和CuO/Ag的光催化性能进行了研究,降解目标物甲基橙来分析制备的CuO和CuO/Ag复合纳米材料的光催化性能。实验结果表明,CuO/Ag纳米材料对甲基橙的降解能力比CuO要强,CuO分别与摩尔浓度为0.01 mol·L^-1、0.03 mol·L^-1和0.05 mol·L^-1的AgNO3溶液通过加入抗坏血酸还原,制备出的不同负载Ag含量的CuO/Ag复合纳米材料,随着光照时间的延长,在降解120 min后的降解率分别为21.52%、31.65%和18.99%,以摩尔浓度为0.03mol·L^-1的AgNO3制备的CuO/Ag的光催化性能最高,是单纯CuO的2.5倍。负载Ag以后的CuO能促进光生电子与空穴的分离,使空穴与甲基橙结合来达到降解的目的,从而提高光催化性能。

Nano CuO was prepared by hydrothermal method,and silver was loaded on the Nano CuO by deposition.The size and phase compositions of the synthesized nano CuO and CuO/Ag composites were characterized by particle size analyzer and X-ray diffraction.The photocatatalytic properties of CuO and CuO/Ag were investigated by UV-Visible spectrum,and the photocatalytic properties of the prepared CuO and CuO/Ag composite nanomaterials were analyzed through degrading target methyl orange.The experimental result showed that the degradation ability of Cu O/Ag nanomaterials on methyl orange was stronger than that of CuO.CuO/Ag composite nanomaterials with different load silver content were prepared by using CuO and silver nitrate solutions of 0.01,0.03,0.05 mol·L^-1 respectively through adding ascorbic acid.With the prolongation of light time,the degradation rate after the degradation of 120 min was 21.52%,31.65% and 18.99%,respectively.The photocatalytic activity of CuO/Ag prepared by 0.03 mol/L silver nitrate was the highest,which was 2.5 times that of CuO.CuO loaded with silver can promote the separation of photoelectrons and holes,and combine the holes with methyl orange to promote photocatalytic performance.