Abstract A Janus Cu(OH)2@Cu2O/Cu mesh has been synthesized by UV irradiation and in situ hydrazine vapor reduction of superhydrophobic Cu(OH)2/Cu mesh prepared by electrochemical anodization of Cu mesh followed by ODS modification. The Cu2O nanoparticles derived from partial reduction of Cu(OH)2 deposit on the Cu(OH)2 to form a core-shell heterostructure, which endows the as-prepared mesh with micro/nanoscale hierarchical morphology. The wettability of different sides of the mesh can be easily controlled by tuning irradiation time and subsequent reduction. As a result, a unidirectional water penetration phenomenon can be obtained. In addition, based on the asymmetric wettability as well as the photocatalytic activity of the Cu(OH)2@Cu2O nanoneedle decorated mesh, the ultrahigh permeation flux and high separation efficiency with excellent in situ photocatalytic ability can also be achieved. This work may provide a rational and convenient strategy to construct Janus mesh with visible light photocatalysis toward in situ dual-functional water purification.

中文翻译：

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Janus Cu(OH)2@Cu2O/Cu网的制备及其在含油废水净化中的应用

摘要 通过对 Cu 网格进行电化学阳极氧化和 ODS 改性制备的超疏水性 Cu(OH)2/Cu 网格，通过紫外线照射和原位肼蒸气还原合成了 Janus Cu(OH)2@Cu2O/Cu 网格。源自 Cu(OH)2 部分还原的 Cu2O 纳米粒子沉积在 Cu(OH)2 上，形成核壳异质结构，使所制备的网格具有微/纳米级分层形态。通过调整照射时间和随后的还原，可以轻松控制网格不同侧面的润湿性。结果，可以获得单向渗水现象。此外，基于Cu(OH)2@Cu2O纳米针装饰网的不对称润湿性和光催化活性，还可以实现超高的渗透通量和高分离效率以及优异的原位光催化能力。这项工作可能为构建具有可见光光催化原位双功能水净化的 Janus 网提供一种合理和方便的策略。