Synthesis of Cu2O/Ag Composite Catalysts and Their Photocatalytic Property under Infrared Light Irradiation
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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(005)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892%.另外对Cu2O/Ag(x)复合催化剂的降解机理进行了探讨.
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关键词:
- Cu2O/Ag(x)复合催化剂 /
- 光吸收 /
- 光催化 /
- 降解甲基橙
Abstract: 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 light 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 catalysts exhibit strong absorption of sunlight. The photocatalytic performances of Cu2O/Ag(x) catalysts in the darkness 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 892% in 120 min. Inaddition, the photocatalytic mechanism of the Cu2O/Ag(x) composite catalyst system was proposed. -
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期刊类型引用(7)
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