Abstract：
In this study, copper oxide (CuO) was prepared by the microwave-assisted hydrothermal technique subsequently, CuO was grown in situ onto different rare metal compounds to prepare Z-scheme heterojunctions to improve the degradation efficiency of tetracycline (TC) in water environments. Various characterization proved the successful synthesis of all composite materials, and the formation of tight heterojunction interfaces, among which, the core-shell structure ZnIn2S4@CuO exhibited excellent photocatalytic degradation capability. Research results indicated that the degradation efficiency of ZnIn2S4@CuO for TC (50 mg/L) in the water environment reached 95.8 %, and the degradation rate is 2.41 times and 12.93 times that of CuO and ZnIn2S4 alone, respectively, the reason is because of the introduction of ZnIn2S4, Z-scheme heterojunction structures and internal electric field (IEF) is constructed and formed to extend the visible light response range of photocatalysts to improve electron-hole separation efficiency, and enhance charge transfer. In addition, ZnIn2S4@CuO-2 exhibited good stability and reproducibility, with no significant loss of activity after five cycles. Finally, the precise locations of free radical attack on TC were investigated by the combined use of high-resolution mass spectrometry (HR-MC) and frontier electron densities (FEDs), and a reasonable degradation pathway was provided. The results of this research provide a new and viable approach to overcome the limitations of conventional photocatalytic materials in terms of limited visible light absorption range and fast carrier recombination rates, which offers promising prospects for a wide range of applications in the field of wastewater purification.
摘要：
在这项研究中,随后通过微波辅助水热技术制备了氧化铜(CuO),将CuO原位生长到不同稀有金属化合物上，制备Z型异质结，以提高水环境中四环素（TC）的降解效率。各种表征证明了所有复合材料的成功合成，形成紧密的异质结界面，其中,核壳结构ZnIn2S4@CuO表现出优异的光催化降解能力。研究结果表明,ZnIn2S4@CuO在水环境中对TC(50mg/L)的降解效率达到95.8%,降解速率分别是CuO和ZnIn2S4的2.41倍和12.93倍,分别,原因是由于ZnIn2S4的引入，Z-scheme异质结结构和内部电场（IEF）的构建和形成，以扩大光催化剂的可见光响应范围，提高电子-空穴分离效率，增强电荷转移。此外,ZnIn2S4@CuO-2具有良好的稳定性和重现性,五个周期后没有明显的活性损失。最后,通过结合使用高分辨率质谱（HR-MC）和前沿电子密度（FED）研究了自由基对TC的精确攻击位置，并提供了合理的降解途径。这项研究的结果提供了一种新的可行方法，可以克服常规光催化材料在有限的可见光吸收范围和快速的载流子复合速率方面的局限性，在污水净化领域具有广阔的应用前景。
