Cu₂O is one of ideal candidate photocatalyst, and it has attracted considerable attention owing to its low-cost and visible light responsive. Here, a core-shell structure of Cu₂O@CuO-Ag with S-scheme heterojunction was delicately designed and synthesized for efficient photocatalytic degradation of the methyl orange (MO) and reduction of Cr(VI) under visible light. The shell of CuO and Ag nanoparticles were successfully close wrapped cube Cu₂O core by the in situ topotactic oxidation of Cu⁺ in the surface of Cu₂O and light deposition strategies, respectively. The Cu₂O@CuO-Ag hybrid exhibits excellent photodegradation of MO activity and the reaction constant k is approximately 0.16 min⁻¹, that is 8.20 times and 2.18 times higher than that for pure Cu₂O and Cu₂O@CuO, respectively. The Cu₂O@CuO-Ag hybrid was also used to remove Cr(VI), and it exhibited not only strong adsorption ability, but also displayed remarkably promote photocatalytic performance in the absence of the sacrificial agents. The origin of the efficient activity of Cu₂O@CuO-Ag hybrid photocatalyst was synergistic reaction to promote charge separation by S-scheme heterojunction designing and Ag acted as electron trap. This work provides a reference to design heterojunction photocatalysts based on Cu₂O for photodegradation.

Cu ₂ O是理想的候选光催化剂之一，由于其低成本和可见光响应性而引起了广泛关注。在这里，精心设计和合成了具有 S 型异质结的 Cu ₂ O@CuO-Ag的核壳结构，用于在可见光下高效光催化降解甲基橙 (MO) 和还原 Cr(VI)。CuO和Ag纳米粒子的壳分别通过Cu ₂ O表面Cu ^+的原位拓扑氧化和光沉积策略成功地紧密包裹立方体Cu ₂ O核。铜₂O@CuO-Ag杂化物表现出优异的MO活性光降解，反应常数k约为0.16 min ^{-1 ，分别是纯Cu} ₂ O和Cu ₂ O@CuO的8.20倍和2.18倍。Cu ₂ O@CuO-Ag杂化物也用于去除Cr(VI)，它不仅表现出很强的吸附能力，而且在没有牺牲剂的情况下表现出显着的光催化性能提升。_{Cu 2} O@CuO-Ag杂化光催化剂的高效活性源于通过S型异质结设计和Ag作为电子陷阱促进电荷分离的协同反应。该工作为设计基于Cu的异质结光催化剂提供了参考₂ O 用于光降解。