Hollow copper oxide spheres with a diameter of 1.5–2 μm were prepared by hydrothermal reaction at 170 °C for 10 h in one step. The product was characterized by SEM, XRD, XPS, and EDX. We deduced the possible formation mechanism of the morphology through its nucleation process. Ostwald ripening process and NH₃ produced by urea should be the main reason for the formation of hollow structure. We also explore the effects of different experimental conditions and find that the morphology is controllable. Finally, the photocatalytic experiments showed that the products have excellent photocatalytic activity and can be used in wastewater treatment.

中文翻译：

---

一步法水热合成具有高光催化活性的CuO空心球

通过第一步在170°C的水热反应10 h，制备了直径为1.5–2μm的空心氧化铜球。用SEM，XRD，XPS和EDX对产品进行表征。我们通过其成核过程推导了该形态的可能形成机理。奥斯特瓦尔德熟化过程和尿素产生的NH ₃应当是形成空心结构的主要原因。我们还探索了不同实验条件的影响，发现形态是可控的。最后，光催化实验表明该产品具有优异的光催化活性，可用于废水处理。