Cu_2O/Ag复合催化剂的合成及红外光激发下的光催化性能研究  

Synthesis of Cu_2O/Ag Composite Catalysts and Their Photocatalytic Property under Infrared Light Irradiation

作　　者：简蓝[1] 万霞[1] 铁绍龙[1] 

机构地区：[1]华南师范大学化学与环境学院,广州510006

出　　处：《华南师范大学学报（自然科学版）》2015年第5期44-49,共6页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(11374109)

摘　　要：采用液相还原法合成不同摩尔比的Cu2O/Ag(x)复合型催化剂,应用X-射线粉末衍射(XRD)、扫描电子显微镜(SEM)、紫外可见漫反射(DRS)等分析手段对样品进行表征.结果显示,纳米金属Ag的存在使得Cu2O/Ag(x)样品对光的吸收扩展到了整个可见和近红外区,且随样品中Ag含量的增加,该区域的吸收逐渐增强,证明Cu2O/Ag(x)复合催化剂对太阳光具有高的吸收能力.以甲基橙(MO)为目标降解物,研究催化剂在黑暗条件下的降解性能,结果表明Cu2O/Ag(0.05)催化剂具有最高的降解能力,在120 min内黑暗条件下MO(30 mg/L)降解率达到89.2%.另外对Cu2O/Ag(x)复合催化剂的降解机理进行了探讨.A series of Cu2O/Ag （x） composite catalysts with different molar ratios were synthesized by a liquid phase reduction method. The properties of Cu2O/Ag（x） samples were characterized by SEM, XRD and DRS （UV- Vis-NIR） analyzing methods. The results indicated that in the presence of nanometre metallic Ag, the Sight absorption of Cu2O/Ag（x） sample was greatly extended to visible and near infrared wavelength regions. With increasing molar ratio of Ag, the absorption intensities of samples enhanced. This implies that Cu2O/Ag （x） composite cata- lysts exhibit strong absorption of sunlight. The photocatalytic performances of Cu2O/Ag （x） catalysts in the dark- ness were evaluated using methyl orange （MO） as a degradation target. The results showed that Cu2O/Ag（0. 05） sample exhibited the highest photocatalytic activity, while the degradation rate of MO （30 mg/L） reached 89.2% in 120 rain. Inaddition, the photocatalytic mechanism of the Cu2O/Ag （x） composite catalyst system was proposed.

关 键 词：Cu2O/Ag(x)复合催化剂 光吸收 光催化 降解甲基橙 

分 类 号：O611.6[理学—无机化学]