Abstract The photocatalytic process is used to remove organic contaminants, dyes, industrial sewage from wastewater before reusing it for human consumption again. Here a simple cost-effective ultrasonic spray pyrolysis (USP) technique is used to deposit ZnO microflower on glass and stainless steel (SS) mesh in a single step. X-Ray Diffraction (XRD) and Raman spectroscopy indicate the polycrystalline wurtzite nature of ZnO. Field emission scanning electron microscope (FESEM) shows the ZnO microflower structure. PL and XPS studies show the oxygen defect in the films. Photocatalytic degradation results show that methylene blue (MB) dye with 1 × 10−5 M concentration can be degraded around 97.94% and 85% in 120min and 210 min with a degradation rate of 0.03035 min−1 and 0.00917 min−1 respectively using ZnO deposited on SS mesh and glass substrate in both UV–Vis and sunlight condition. ZnO deposited on SS mesh shows high repeatability performance to degrade the MB and it can degrade 96% of MB at 10th cycle. Degradation rate at base medium is higher than acidic medium. A plausible photocatalysis mechanism is also explained.

中文翻译：

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UV-Vis和自然阳光下不锈钢网上高效可重复使用的ZnO微花光催化剂

摘要 光催化过程用于去除废水中的有机污染物、染料、工业污水，然后再回用于人类消费。在这里，一种简单且经济高效的超声波喷雾热解 (USP) 技术用于一步将 ZnO 微花沉积在玻璃和不锈钢 (SS) 网上。X 射线衍射 (XRD) 和拉曼光谱表明 ZnO 的多晶纤锌矿性质。场发射扫描电子显微镜 (FESEM) 显示了 ZnO 微花结构。PL 和 XPS 研究表明薄膜中存在氧缺陷。光催化降解结果表明，浓度为 1 × 10−5 M 的亚甲蓝 (MB) 染料在 120 分钟和 210 分钟内可降解约 97.94% 和 85%，降解速率分别为 0.03035 min-1 和 0。00917 min-1 分别使用在 UV-Vis 和阳光条件下沉积在 SS 网和玻璃基板上的 ZnO。沉积在 SS 网格上的 ZnO 显示出高重复性性能，可以降解 MB，在第 10 次循环时可以降解 96% 的 MB。在碱性介质中的降解率高于酸性介质。还解释了合理的光催化机制。