采用一步液相还原法合成出系列Cu2O/Agx复合催化剂，使用XRD、SEM、TEM、DRS等分析手段对样品进行性质表征. 结果显示，复合催化剂Cu2O/Ag表面附着大量的纳米金属Ag，形成无数的纳米岛，使得样品的等离子体共振效应大幅增强，导致催化剂在紫外、可见和近红外全光谱区域的光吸收非常强. 在无需超声分散、黑暗条件下Cu2O/Agx催化剂可以有效地还原Cr(VI)，其中Cu2O/Ag0.15样品的催化还原效率最高. 当存在0.01mol/L的柠檬酸缓冲液(pH 5.0)时，100 mg/L的Cr(VI)在黑暗下于30min内被完全还原为Cr3+. 同时对体系催化还原Cr(VI)的机理以及柠檬酸的作用进行了探讨.
A series of Cu2O/Agx composite catalysts were synthesized by a liquid phase reduction method. The properties of Cu2O/Agx samples were characterized by XRD, SEM, TEM and DRS analyzing methods. The results indicated that the surface of Cu2O/Ag catalyst were coated by metallic Ag nanoparticles presenting like islands, inducing in evident enhance in plasmon resonance effect and the light absorption in UV, Vis and NIR wavelength regions. Cr(VI) was reduced by Cu2O/Agx composite catalyst in the dark without ultrasonic dispersion, thereinto, Cu2O/Ag0.15 sample shows the strongest reducing capacity in all catalysts. In the presence of 0.01 M citric acid buffer solution (pH=5.0), 100 mg/L Cr(VI) was completely reducd in 30 min in the dark. Meanwhile, the catalytic reduction mechanism of Cr(VI) in Cu2O/Ag composite catalyst system and the effect of citric acid were proposed.