Vai Zoğullar Ali İmran, Topkara Çağla, Uğurlu Mehmet
Vocational School Health Care, Medical Laboratory Programme, Muğla Sıtkı Koçman University, Muğla 48000, Turkey.
Faculty of Science, Department of Chemistry, Muğla Sıtkı Koçman University, Muğla 48000, Turkey.
ACS Omega. 2023 Feb 28;8(10):9423-9433. doi: 10.1021/acsomega.2c08090. eCollection 2023 Mar 14.
With increasing industrial production, pollutants generated in the process of bleaching or dying disperse to the natural water medium. Therefore, an effective photocatalytic material must be prepared for water treatment quickly. In the present study, a novel and effective V-scheme AgWO/BaO/NiO heterostructure photocatalyst with high photocatalytic performance for the degradation of different organic pollutants was designed and formed by a simple precipitation method. Scanning electron microscopy images showed that BaO, NiO, and AgWO/BaO/NiO have a nanopipe, spherical, and nanorod morphology, respectively. X-ray diffraction results indicated that cubic phases were obtained with higher crystallite structure and lower crystallite distortion. The optical properties of the samples exhibited UV-absorption regions with about 3.35, 3.38, and 3.28 eV band gaps for BaO, BaO/NiO, and AgWO/BaO/NiO, respectively. The photocatalytic activity was investigated by the degradation of Congo red under UV-light irradiation. To investigate the photocatalytic mechanism, the photodegradation performance of the catalyst was analyzed with different scavengers such as isopropyl alcohol, ascorbic acid, and potassium iodide (KI), and it was shown that the main active species were O radicals and that OH radicals have a significant contribution toward the degradation process. Compared to bare BaO and BaO/NiO samples, AgWO/BaO/NiO showed excellent photocatalytic activity and about 41%, 66 and 99% of Congo red photodegraded under UV light within 30 min. The reason for this is that the AgWO/BaO/NiO heterostructure displayed wider contact which promoted more charge-transfer ways to shorten the electron transportation path and increase the inhibition of electron-hole pairs.
随着工业生产的增加，漂白或染色过程中产生的污染物扩散到天然水介质中。因此，必须迅速制备一种有效的光催化材料用于水处理。在本研究中，通过简单的沉淀法设计并形成了一种新型高效的V型AgWO/BaO/NiO异质结构光催化剂，该催化剂对不同有机污染物的降解具有高光催化性能。扫描电子显微镜图像显示，BaO、NiO和AgWO/BaO/NiO分别具有纳米管、球形和纳米棒形态。X射线衍射结果表明，获得了具有较高微晶结构和较低微晶畸变的立方相。样品的光学性质显示，BaO、BaO/NiO和AgWO/BaO/NiO的紫外吸收区域的带隙分别约为3.35、3.38和3.28 eV。通过在紫外光照射下降解刚果红来研究光催化活性。为了研究光催化机理，用异丙醇、抗坏血酸和碘化钾（KI）等不同清除剂分析了催化剂的光降解性能，结果表明主要活性物种是O自由基，并且OH自由基对降解过程有显著贡献。与裸BaO和BaO/NiO样品相比，AgWO/BaO/NiO表现出优异的光催化活性，在紫外光下30分钟内约41%、66%和99%的刚果红被光降解。其原因是AgWO/BaO/NiO异质结构表现出更广泛的接触，促进了更多的电荷转移方式，从而缩短了电子传输路径并增强了对电子-空穴对的抑制。
