In this study, flake-like MoO₃-ZnO composite was prepared using a simple and robust electrochemical setup. The composite was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, elemental analysis, X-ray photoelectron spectroscopy, thermogravimetric analysis, photoluminescence, zeta potential analysis, and electrochemical impedance study. The modified ZnO shows a remarkable catalytic activity towards the photodegradation of three potentially hazardous dyes, malachite green, crystal violet, and methylene blue. More than 95% of both malachite green and crystal violet degraded within 140 min under visible light irradiation. Scavenger studies reveal that OH· radicals produced by the photo-separated charges on MoO₃-ZnO are responsible for the degradation of all three dyes. The photoactive charge carriers show less recombination rate as evidenced by the photoluminescence spectrum due to the interparticle charge migration process. This work suggests a new versatile procedure for the synthesis of MoO₃-ZnO composites and establishes its photocatalytic efficacy under visible light with three common pollutant dyes found in wastewater.

Graphical Abstract

中文翻译：

---

使用电化学合成的 MoO 3 /ZnO 可见光光降解有机染料

在这项研究中，片状 MoO ₃ -ZnO 复合材料是使用简单而稳定的电化学装置制备的。通过 X 射线衍射、傅里叶变换红外光谱、扫描电子显微镜、元素分析、X 射线光电子能谱、热重分析、光致发光、zeta 电位分析和电化学阻抗研究对复合材料进行了表征。改性的 ZnO 对三种具有潜在危险的染料（孔雀石绿、结晶紫和亚甲蓝）的光降解表现出显着的催化活性。在可见光照射下，超过 95% 的孔雀石绿和结晶紫在 140 分钟内降解。清除剂研究表明，MoO ₃上光分离电荷产生的OH ·自由基-ZnO 负责所有三种染料的降解。由于粒子间电荷迁移过程，光敏电荷载流子表现出较低的复合率，如光致发光光谱所示。这项工作为合成 MoO ₃ -ZnO 复合材料提出了一种新的通用方法，并在可见光下与废水中发现的三种常见污染物染料建立了光催化功效。

图形概要